Emcor Group, Inc
Business Description synthesis.

•Vendor management and call center services; and •Infrastructure and building projects for federal, state, and local governmental agencies. Our building services operations have built upon our traditional electrical and mechanical construction operations and our client relationships to expand the scope of services being offered and to develop packages of services for customers on a local, regional, and national basis. Our building services operations, which generated approximately 21% of our 2025 total revenues, provide services to owners, operators, tenants, and managers of all types of facilities. Of our building services revenues for 2025, approximately 87% were generated in the United States and approximately 13% were generated in the United Kingdom. As noted above, in December 2025, we sold our operations in the United Kingdom. 3 Of the building services revenues generated in the United States during 2025, approximately 77% was generated from our mechanical services division, approximately 18% was generated from our commercial site-based services division, and approximately 5% was generated from our government site-based services division. Our mechanical services division has benefited, in recent years, from increased demand for HVAC project and retrofit work, greater service repair and maintenance volumes, and the expansion of our building automation and controls solutions. Demand for our building services is often driven by customers' decisions to focus on their core competencies, customers' programs to reduce costs, the increasing technical complexity of customers' facilities, including their mechanical, electrical, building automation, voice and data, and other systems, and the need for increased reliability, energy efficiency, and air filtration and sanitization. These trends have led to outsourcing and privatization programs whereby customers in both the private and public sectors seek to contract out those activities that support, but are not directly associated with, the customer's core business. Clients of our building services business include major corporations engaged in information technology, telecommunications, pharmaceuticals, financial services, and manufacturing, institutional organizations, healthcare providers, large retailers and other businesses with geographically dispersed locations, as well as federal and state governments. Within our government site-based services division, we provide building services at a number of prominent buildings in the United States, including those that house the National Archives and Records Administration, the Federal Deposit Insurance Corporation, the Government Accountability Office, and the Departments of Transportation, Education, Health and Human Services, Energy, and Homeland Security, as well as other government facilities. We also provide building services, as a prime contractor or a subcontractor, to U.S. government and intelligence agencies. The agreements pursuant to which this division provides services to the federal government are frequently for a base period and a number of option years exercisable at the sole discretion of the government, are often subject to modification or renegotiation by the government in terms of scope of services, and are subject to termination for convenience by the government prior to the expiration of the applicable term.

Human Capital At December 31, 2024, we employed approximately 40,400 people, approximately 37,500 of whom were located within the United States and approximately 2,900 of whom were located in the United Kingdom. Based on the most recent information available from our latest filing with the U.S. Equal Employment Opportunity Commission, the gender demographic of our U.S. employees was 89% male and 11% female. Additionally, based on such information, our U.S. employees had the following race and ethnicity demographics:

Overview We are one of the largest specialty contractors in the United States and a leading provider of electrical and mechanical construction and facilities services, building services, and industrial services. In 2025, we had revenues of $16.99 billion. Our services are provided to a broad range of commercial, technology, manufacturing, industrial, healthcare, utility, and institutional customers through approximately 100 operating subsidiaries, which specialize principally in providing construction services relating to electrical and mechanical systems in all types of facilities and in providing various services relating to the operation, maintenance, and management of those facilities. Such operating subsidiaries are organized into the following reportable segments: •United States electrical construction and facilities services; •United States mechanical construction and facilities services;

Competition Across our operations, we compete with national, regional, and local companies, many of which are small, owner-operated entities that carry on their businesses in a limited geographic area, as well as with certain foreign companies. The electrical and mechanical construction services industry is highly fragmented and our competition includes thousands of small companies across the United States. In addition, there are a number of larger companies focused on providing electrical and/or mechanical construction services, such as APi Group Corporation, Comfort Systems USA, Inc., Dycom Industries, Inc., Everus Construction Group, Inc., IES Holdings, Inc., MasTec, Inc., MYR Group Inc., Quanta Services, Inc., and Tutor Perini Corporation. A majority of our revenues are derived from projects requiring competitive bids; however, an invitation to bid is often conditioned upon prior experience, technical capability, and financial strength. Competitive factors in the electrical and mechanical construction services business include: (a) the availability of qualified and/or licensed personnel; (b) reputation for integrity and quality; (c) safety record; (d) cost structure and the ability to control project costs; (e) relationships with customers; (f) price; (g) geographic diversity; (h) experience in specialized markets; (i) the ability to obtain surety bonding; (j) adequate working capital or access to bank credit; and (k) the use of technology such as virtual design construction ("VDC"), building information modeling ("BIM"), robotics, and automation. We believe our financial position, operating results, access to bank credit and surety bonding, technical expertise including prefabrication, VDC, and BIM capabilities, and safety record, among other factors, give us an advantage over many of our competitors. However, relatively few barriers exist to prevent entry into the electrical and mechanical construction services industry. While the building services industry is also highly fragmented, with most competitors operating in a specific geographic region, a number of large corporations and original equipment manufacturers are engaged in this field. Within our mechanical services division, we compete with entities such as APi Group Corporation, Comfort Systems USA, Inc., and Service Logic LLC, as well as Carrier Global Corporation and Trane Technologies plc. Within our commercial and government site-based divisions, competition includes companies such as Amentum Services, Inc., IAP Worldwide Services, Inc., Fluor Corporation, Cushman & Wakefield plc, CBRE Group, Inc., Jones Lang LaSalle Incorporated, Sodexo, Inc., Aramark, and ABM Industries Incorporated. In addition, we compete with several regional firms serving all or portions of the markets we target, such as BrightView Holdings, Inc., Kellermeyer Bergensons Services, LLC, and SMS Assist, L.L.C. The key competitive factors in the building services industry include: (a) availability of qualified personnel and managers; (b) service quality and technical expertise; (c) the use of technology tools and data analytics; (d) cost structure and the ability to control project costs; (e) price; and (f) geographic diversity. Due to our financial strength, scope of service offerings, our technical capability and management experience, and our geographic presence, we believe our building services operations are in a strong competitive position. However, there are relatively few barriers to entry into the building services industry. The market for providing industrial services includes large national providers, as well as numerous regional companies. In the manufacture of heat exchangers, we compete with both U.S. and foreign manufacturers. Competitors within this industry include JVIC, Universal Plant Services, Inc., Turner Industries Group, LLC, Team, Inc., Specialty Welding and Turnarounds, LLC, Cust-O-Fab, Inc., Dunn Heat Exchangers, Inc., Turn2 Specialty Companies, and Wyatt Field Service Company, LLC, among others. The key competitive factors in the industrial services market consist of: (a) availability of skilled workforce; (b) technical expertise; (c) service, quality, and ability to respond quickly; (d) price; and (e) safety record. Due to our technical capabilities, skilled workforce, and safety record, we believe that we are in a strong competitive position in the industrial services markets that we serve. Although the technical expertise and capital investment that is required in manufacturing heat exchangers may be considered a barrier to entry in this field, there are significantly fewer barriers to entry as it pertains to turnaround projects and services.

Commitment to Core Values We are committed to our EMCOR Values of Mission First: Integrity, Discipline, and Transparency and People Always: Mutual Respect and Trust, Commitment to Safety, and Teamwork. We consistently strive to ensure these values are reflected in how we do business every day, from our corporate culture and "tone at the top," established by our Board of Directors and management team, to the critical work performed by all of our people at every level throughout our organization. We reinforce our EMCOR Values through many ongoing initiatives. Our EMCOR Values are embodied in our policies and procedures, including our Code of Business Ethics and Conduct. We also regularly provide training on these values, both at time of hire and on an ongoing, periodic basis. In addition, to develop and reinforce our values company-wide, and empower our leaders to perform at the highest levels, senior leaders are invited to our Leadership for Results course at the Georgia Tech Scheller College of Business and our Leading with Character program at the Thayer Leadership Development Group at West Point. In addition, identified front line supervisors such as project managers and superintendents are invited to our Leader Development Program, which focuses on the development of skills to enhance their growth as leaders and emphasizes the importance of our EMCOR Values.

Workplace Safety We believe that our focus on employee safety and well-being is reflected in our results. During a year in which our people worked nearly 100 million hours, the Company's Total Recordable Incident Rate in 2025 was just under 1.0, which was approximately 60% lower than the U.S. Bureau of Labor Statistics' most recently available industry average of 2.4 for NAICS Code 2382, Building Equipment Contractors. This represents our seventeenth consecutive year with a Total Recordable Incident Rate which was less than half the industry average. Our position as an industry leader in safety begins with a strong culture of care and vigilance embodied in our EMCOR Values and is supported by a comprehensive suite of training, resources, and analytics. These include: (a) our signature Be There for Life! Zero Injuries Program and Be Vigilant! Campaign, (b) incident and injury prevention planning, including in-person and online training tools and best practice guides available through our company intranet as well as to all field employees through their mobile devices, (c) enterprise level reporting and analysis of leading and lagging indicators, (d) a 24-hour incident reporting hotline, and (e) a company-wide program to share and champion best safety practices across our range of businesses. These tools have evolved with the way our people work. 6

•United States building services; and •United States industrial services. On December 1, 2025, we sold our United Kingdom operations, the results of which are reported within our United Kingdom building services segment through the date of sale. Our operating subsidiaries offer comprehensive and diverse solutions on a broad scale and have many long-standing customer relationships. We provide construction services and building services directly to corporations, municipalities and federal and state governmental entities, owners/developers, and tenants of buildings. We also provide our construction services indirectly by acting as a subcontractor to general contractors, systems suppliers, construction managers, developers, property managers, and other subcontractors. We generally provide industrial services directly to refineries and petrochemical plants. We derive revenues from many different customers in numerous industries, which have operations in several different geographical areas. Of our 2025 revenues, approximately 97% were generated in the United States and approximately 3% were generated in the United Kingdom. In 2025, we derived approximately 72% of our revenues from our construction operations, approximately 21% of our revenues from our building services operations, and approximately 7% of our revenues from our industrial services operations. For additional information regarding our revenues, see Note 3 - Revenue from Contracts with Customers of the notes to consolidated financial statements included in Item 8. Financial Statements and Supplementary Data. We believe that our range of service offerings, technical capability, skilled workforce, and strong project execution, along with our safety culture and financial resources, differentiate us from our competition and position us to benefit from future capital and maintenance spending by our existing and potential customers. Our strategies of expanding our portfolio of service offerings and increasing or enhancing our presence in core end markets and geographies, along with our commitment to industry-leading best practices and technological and training capabilities, place us in the position to capitalize on opportunities and trends in the industries we serve and continue to grow our business. Increasingly, our services are focused on delivering sustainable energy solutions, enhancements in energy efficiency, reductions in waste and emissions, and improvements in the safety and comfort of our customers' facilities. The broad scope of our operations is more particularly described below. For detailed segment financial information refer to Note 18 - Segment Information of the notes to consolidated financial statements included in Item 8. Financial Statements and Supplementary Data.

•Millwright services; and •Steel fabrication, erection, and welding services. The electrical and mechanical construction services industry has experienced growth principally due to the increased content, complexity, and sophistication of electrical and mechanical systems resulting, in part, from growth in digital processing, cloud computing, data storage, and the emergence of artificial intelligence ("AI"). In addition, facilities of all types require extensive electrical distribution systems, sophisticated power supplies, networks of low-voltage and fiber-optic communications cabling, and various mechanical, plumbing, and fire protection and suppression systems. Moreover, the need for substantial environmental controls within a building, due to the heightened need to maintain extensive servers at optimal temperatures, and the demand for increased energy efficiency, have continued to expand opportunities for our electrical and mechanical services businesses. The demand for these services is typically driven by non-residential construction and renovation activity and, in recent years, has benefited from the expansion of data centers to power AI and cloud computing, the re-shoring of the supply chain, the need for additional high-tech manufacturing facilities, and the energy transition/expansion throughout the United States. Our electrical and mechanical construction services generally fall into one of three categories: (a) large installation projects, with contracts often in the multi-million dollar range, that involve: (i) the construction of manufacturing facilities, data centers, warehousing and distribution facilities, hospitals, and commercial buildings, (ii) institutional, public works, and infrastructure projects, or (iii) the fit-out of large blocks of space within commercial or mixed-use buildings, (b) large and medium sized capital and maintenance projects for commercial, manufacturing, pharmaceutical, healthcare, oil and gas, and industrial clients, and (c) smaller installation projects, of a short duration, typically involving fit-out, renovation, and retrofit work. Our United States electrical and mechanical construction operations accounted for approximately 72% of our 2025 total revenues. Of such revenues, approximately 42% were generated by our electrical construction operations and approximately 58% were generated by our mechanical construction operations. Our largest projects include those within: (a) the network and communications market sector (including data centers, data and fiber projects, and cabling); (b) the high-tech manufacturing market sector (including semiconductor, biotech, life-sciences, and pharmaceutical facilities, as well as projects across the electric vehicle value chain); (c) the manufacturing and industrial market sector (including food processing and traditional automotive manufacturing facilities, steel, pulp and paper mills, power generation (including sustainable energy solutions such as solar and wind), oil and gas refineries, and chemical processing plants); (d) the commercial market sector (including warehousing and distribution facilities and office or mixed-use buildings); (e) the healthcare market sector (including hospitals, surgical centers, rehabilitation and nursing facilities, and medical offices); (f) the institutional market sector (including educational and correctional facilities and research laboratories); (g) the water and wastewater market sector; (h) the transportation market sector (including highways, bridges, airports, and transit systems); and (i) the hospitality and entertainment market sector (including resorts, hotels, gaming facilities, convention centers, and sports arenas and stadiums). Our largest projects, which typically range in size from $10 million up to and occasionally exceeding $200 million, represented approximately 58% of our electrical and mechanical construction services revenues in 2025. These projects often involve new construction and a combination of design, installation, and start-up services. Depending on the size and complexity of these projects, they may span multiple years and typically require significant technical and management skills and the financial strength to obtain performance bonds, which are often a condition to bidding for and winning these projects. Our projects of less than $10 million accounted for approximately 42% of our electrical and mechanical construction services revenues in 2025. These projects are typically completed in less than one year. They usually involve electrical and mechanical construction services when an end-user or owner undertakes construction or modification of a facility to accommodate a specific use, upgrade or replace aging systems, or increase energy efficiency. These projects frequently require electrical and mechanical systems to meet special needs such as critical systems power supply, fire protection systems, special environmental controls and high-purity air systems, sophisticated electrical and mechanical systems for data centers, new production lines in manufacturing plants, and office arrangements in existing office buildings. They are not usually dependent upon the new construction market. Demand for these projects and types of services is often prompted by the expiration of leases, changes in technology, the demand for more energy efficient systems, or changes in the customer's plant or office layout in the normal course of a customer's business.

Industrial services operations: Our industrial services are primarily provided to customers within the oil, gas, and petrochemical industries and consist of: •Refinery turnaround planning and engineering services; •Specialty welding services; •Overhaul and maintenance of critical process units in refineries and petrochemical plants; •Specialty technical services for refineries and petrochemical plants; •Instrumentation, controls, and electrical services for energy infrastructure; •Electrical panel design, fabrication, and installation; •On-site repairs, maintenance, and service of heat exchangers, towers, vessels, and piping;

United States and United Kingdom building services operations: Our building services include: •Maintenance and services for mechanical, electrical, plumbing, fire safety, and building automation systems; •Modification and retrofit projects; •Program development, management, and maintenance for energy systems, including LEED and other sustainable solutions to assist our customers in reducing energy consumption; •Energy efficiency retrofit services, including HVAC, lighting, water, weatherization, and air flow management solutions; •Technical consulting and diagnostic services; •Services aimed at improving indoor air quality; •Installation and support for building systems; •Commercial and government site-based operations and maintenance; •Facility management, maintenance, and services; •Floor care and janitorial services; •Landscaping, lot sweeping, and snow removal; •Other building services, including reception, security, and catering services; •Vendor management and call center services;

Human Capital At December 31, 2024, we employed approximately 40,400 people, approximately 37,500 of whom were located within the United States and approximately 2,900 of whom were located in the United Kingdom. Based on the most recent information available from our latest filing with the U.S. Equal Employment Opportunity Commission, the gender demographic of our U.S. employees was 89% male and 11% female. Additionally, based on such information, our U.S. employees had the following race and ethnicity demographics:

United States electrical and mechanical construction and facilities services operations: Our electrical and mechanical construction services primarily involve the design, integration, installation, start-up, operation and maintenance, and provision of services relating to: •Systems for electrical power transmission, distribution, and generation, including power cables, conduits, distribution panels, transformers, generators, uninterruptible power supply systems, and related switch gear and controls; •Premises electrical and lighting systems, including fixtures and controls; •Process instrumentation in the refining, chemical processing, and food processing industries; •Low-voltage systems, such as fire alarm, security, and process control systems; •Voice and data communications, including fiber optic and low voltage cabling, distributed antenna systems, audiovisual systems, and wireless access points; •Sustainable energy solutions such as solar, photovoltaic, and wind, as well as the installation of electric vehicle charging stations; •Roadway and transit lighting and signaling and fiber optic lines; •Computerized traffic control systems, and signal and communication equipment for mass transit systems; •Heating, ventilation, air conditioning, and refrigeration, including both traditional mechanical systems as well as geothermal solutions; •Clean-room process ventilation systems; •Fire protection and suppression systems; •Plumbing, process and high-purity piping systems; •Controls and filtration systems; •Water and wastewater treatment systems; •Central plant heating and cooling systems, including manufacturing and installing sheet metal air handling systems; •Crane and rigging services;

•Millwright services; and •Steel fabrication, erection, and welding services. The electrical and mechanical construction services industry has experienced growth principally due to the increased content, complexity, and sophistication of electrical and mechanical systems resulting, in part, from growth in digital processing, cloud computing, data storage, and the emergence of artificial intelligence. In addition, facilities of all types require extensive electrical distribution systems, sophisticated power supplies, networks of low-voltage and fiber-optic communications cabling, and various mechanical, plumbing, and fire protection and suppression systems. Moreover, the need for substantial environmental controls within a building, due to the heightened need to maintain extensive computer systems at optimal temperatures, and the demand for increased energy efficiency, have continued to expand opportunities for our electrical and mechanical services businesses. The demand for these services is typically driven by non-residential construction and renovation activity and, in recent years, has benefited from the re-shoring of the supply chain, the need for additional high-tech manufacturing facilities, and the energy transition/expansion throughout the United States. Our electrical and mechanical construction services generally fall into one of three categories: (a) large installation projects, with contracts often in the multi-million dollar range, that involve: (i) the construction of manufacturing facilities, data centers, warehousing and distribution facilities, hospitals, and commercial buildings, (ii) institutional, public works, and infrastructure projects, or (iii) the fit-out of large blocks of space within commercial or mixed-use buildings, (b) large and medium sized capital and maintenance projects for commercial, manufacturing, pharmaceutical, healthcare, oil and gas, and industrial clients, and (c) smaller installation projects, of a short duration, typically involving fit-out, renovation, and retrofit work. Our United States electrical and mechanical construction operations accounted for approximately 67% of our 2024 total revenues. Of such revenues, approximately 34% were generated by our electrical construction operations and approximately 66% were generated by our mechanical construction operations. Our largest projects include those within: (a) the network and communications market sector (including data centers, data and fiber projects, and cabling); (b) the high-tech manufacturing market sector (including semiconductor, biotech, life-sciences, and pharmaceutical facilities, as well as projects across the electric vehicle value chain); (c) the commercial market sector (including warehousing and distribution facilities and office or mixed-use buildings); (d) the manufacturing and industrial market sector (including steel, pulp and paper mills, food processing and traditional automotive manufacturing facilities, power generation (including sustainable energy solutions such as solar and wind), oil and gas refineries, and chemical processing plants); (e) the healthcare market sector (including hospitals, surgical centers, rehabilitation and nursing facilities, and medical offices); (f) the institutional market sector (including educational and correctional facilities and research laboratories); (g) the water and wastewater market sector; (h) the transportation market sector (including highways, bridges, airports, and transit systems); and (i) the hospitality and entertainment market sector (including resorts, hotels, gaming facilities, convention centers, and sports stadiums). Our largest projects, which typically range in size from $10 million up to and occasionally exceeding $200 million, represented approximately 54% of our electrical and mechanical construction services revenues in 2024. These projects often involve new construction and a combination of design, installation, and start-up services. Depending on the size and complexity of these projects, they may span multiple years and typically require significant technical and management skills and the financial strength to obtain performance bonds, which are often a condition to bidding for and winning these projects. Our projects of less than $10 million accounted for approximately 46% of our electrical and mechanical construction services revenues in 2024. These projects are typically completed in less than one year. They usually involve electrical and mechanical construction services when an end-user or owner undertakes construction or modification of a facility to accommodate a specific use, upgrade or replace aging systems, or increase energy efficiency. These projects frequently require electrical and mechanical systems to meet special needs such as critical systems power supply, fire protection systems, special environmental controls and high-purity air systems, sophisticated electrical and mechanical systems for data centers, new production lines in manufacturing plants, and office arrangements in existing office buildings. They are not usually dependent upon the new construction market. Demand for these projects and types of services is often prompted by the expiration of leases, changes in technology, the demand for more energy efficient systems, or changes in the customer's plant or office layout in the normal course of a customer's business.

•Military base operations support services; and •Infrastructure and building projects for federal, state, and local governmental agencies. While not all of the above services are performed in both countries, we provide building services throughout the United States and United Kingdom. Our building services operations have built upon our traditional electrical and mechanical construction operations and our client relationships to expand the scope of services being offered and to develop packages of services for customers on a local, regional, and national basis. 3 Our building services operations, which generated approximately 24% of our 2024 total revenues, provide services to owners, operators, tenants, and managers of all types of facilities both on a contractual basis for a specified period of time and on an individual task order basis. Of our building services revenues for 2024, approximately 88% were generated in the United States and approximately 12% were generated in the United Kingdom. Demand for our building services is often driven by customers' decisions to focus on their core competencies, customers' programs to reduce costs, the increasing technical complexity of customers' facilities, including their mechanical, electrical, building automation, voice and data, and other systems, and the need for increased reliability, energy efficiency, and air filtration and sanitization. These trends have led to outsourcing and privatization programs whereby customers in both the private and public sectors seek to contract out those activities that support, but are not directly associated with, the customer's core business. Clients of our building services business include major corporations engaged in information technology, telecommunications, pharmaceuticals, financial services, and manufacturing, institutional organizations, healthcare providers, large retailers and other businesses with geographically dispersed locations, as well as federal and state governments. We provide building services at a number of prominent buildings in the United States, including those that house the National Archives and Records Administration, the Federal Deposit Insurance Corporation, the Government Accountability Office, and the Departments of Transportation, Education, Health and Human Services, Energy, and Homeland Security, as well as other government facilities. We also provide building services, as a prime contractor or a subcontractor, to U.S. military bases and various other governmental agencies. The agreements pursuant to which this division provides services to the federal government are frequently for a base period and a number of option years exercisable at the sole discretion of the government, are often subject to modification or renegotiation by the government in terms of scope of services, and are subject to termination by the government prior to the expiration of the applicable term.

United States industrial services operations: Our industrial services are primarily provided to customers within the oil, gas, and petrochemical industries and consist of: •Refinery turnaround planning and engineering services; •Specialty welding services; •Overhaul and maintenance of critical process units in refineries and petrochemical plants; •Specialty technical services for refineries and petrochemical plants; •Instrumentation, controls, and electrical services for energy infrastructure; •Electrical panel design, fabrication, and installation; •On-site repairs, maintenance, and service of heat exchangers, towers, vessels, and piping;

Overview We are one of the largest specialty contractors in the United States and a leading provider of electrical and mechanical construction and facilities services, building services, and industrial services. In 2023, we had revenues of approximately $12.6 billion. Our services are provided to a broad range of commercial, technology, manufacturing, industrial, healthcare, utility, and institutional customers through approximately 100 operating subsidiaries, which specialize principally in providing construction services relating to electrical and mechanical systems in all types of facilities and in providing various services relating to the operation, maintenance, and management of those facilities. Such operating subsidiaries are organized into the following reportable segments: •United States electrical construction and facilities services; •United States mechanical construction and facilities services; •United States building services;

Commitment to Core Values We are committed to our EMCOR Values of Mission First: Integrity, Discipline, and Transparency and People Always: Mutual Respect and Trust, Commitment to Safety, and Teamwork. We consistently strive to ensure these values are reflected in how we do business every day, from our corporate culture and "tone at the top," established by our Board of Directors and management team, to the critical work performed by all of our people at every level throughout our organization. We reinforce our EMCOR Values through many ongoing initiatives. Our EMCOR Values are embodied in our policies and procedures, including our Code of Business Ethics and Conduct. We also regularly provide training on these values, both at time of hire and on an ongoing, periodic basis. In addition, to develop and reinforce our values company-wide, and empower our leaders to perform at the highest levels, senior leaders are invited to our Leadership for Results course and our Leading with Character program at the Thayer Leadership Development Group at West Point. In addition, identified front line leaders such as project managers, superintendents and supervisors are invited to our Leader Development Program, which focuses on the development of skills to enhance their growth as leaders and emphasizes the importance of our EMCOR Values.

Workplace Safety We believe that our focus on employee safety and well-being is reflected in our results. During a year in which our people worked over 80 million hours, the Company's Total Recordable Incident Rate in 2023 was just under 1.2, which was approximately 50% lower than the U.S. Bureau of Labor Statistics' most recently available industry average of 2.4 for NAICS Code 2382, Building Equipment Contractors. This represents our fifteenth consecutive year with a Total Recordable Incident Rate which was less than half the industry average. Our position as an industry leader in safety begins with a strong culture of care and vigilance embodied in our EMCOR Values and is supported by a comprehensive suite of training, resources, and analytics. These include: (a) our signature Be There for Life! Zero Injuries Program and Be Vigilant! Campaign, (b) incident and injury prevention planning, including in-person and online training tools and best practice guides available through our company intranet, (c) enterprise level reporting and analysis of leading and lagging indicators, (d) a 24-hour incident reporting hotline, and (e) a company-wide program to share and champion best safety practices across our range of businesses. These tools are evolving with the way our people work, including employees in the field. For example, we have deployed an online safety training program available to any employee on a mobile device. 6

Employee Demographic% of Total White69 % Hispanic / Latinx18 % Black / African American8 % Asian2 % Multiracial, Native American, Native Hawaiian, and Pacific Islander3 % 5 Approximately 60% of our employees are represented by various unions pursuant to approximately 450 collective bargaining agreements between our individual subsidiaries or trade associations and local unions, as well as two collective bargaining agreements that are national or regional in scope. We believe that our relations with our labor unions are generally positive. Our ability to execute complex projects for our customers, and to perform all of our services with the excellence that makes us an industry leader, depends on our success in attracting and retaining skilled labor in a competitive market. We therefore strive to be and remain an employer of choice for the most talented employees in each of the industries and markets in which we operate. This begins with offering competitive employee compensation and benefits packages, specifically designed to meet the unique needs of each individual in our organization, which include: •Health and Welfare Plans: All full-time employees who do not participate in union plans are offered a range of choices among medical, dental and vision plans, life, accident, dependent and disability insurance, and pre-tax health spending accounts that include employer contributions. •Retirement Savings: We help provide our employees with financial security by offering a 401(k) Savings Plan and an Employee Stock Purchase Plan, both of which include company matching contributions. •Degree Assistance: Eligible employees may apply for reimbursement for job-related courses or courses taken as part of a curriculum for a business or job-related degree at an accredited institution. •Employee Assistance Program: Through our Employee Assistance Program, we offer our employees, and their dependents or household members, access to services and counseling on a variety of personal, professional, legal, and financial matters, at no cost. Most recently, we started offering college counseling services for the children of our employees. Key to our attraction and retention of employees is our commitment to our EMCOR Values and our focus on employee safety and diversity, equity, and inclusion. Our Board of Directors and senior leadership engage in oversight and management, respectively, of our significant human capital initiatives. Our Board of Directors is regularly briefed and provides input on key human capital initiatives and metrics.

United States and United Kingdom building services operations: Our building services include: •Mobile mechanical maintenance and services for mechanical, electrical, plumbing, fire safety, and building automation systems; •Modification and retrofit projects; •Program development, management, and maintenance for energy systems, including LEED and other sustainable solutions to assist our customers in reducing energy consumption; •Technical consulting and diagnostic services; •Services aimed at improving indoor air quality; •Installation and support for building systems; •Commercial and government site-based operations and maintenance; •Facility management, maintenance, and services; •Floor care and janitorial services, including enhanced cleaning and sanitization services; •Landscaping, lot sweeping, and snow removal; •Other building services, including reception, security, and catering services; •Vendor management and call center services;

Competition Across our operations, we compete with national, regional, and local companies, many of which are small, owner-operated entities that carry on their businesses in a limited geographic area, as well as with certain foreign companies. The electrical and mechanical construction services industry is highly fragmented and our competition includes thousands of small companies across the United States. In addition, there are a number of larger public companies focused on providing electrical and/or mechanical construction services, such as APi Group Corporation, Comfort Systems USA, Inc., Dycom Industries, Inc., IES Holdings, Inc., MasTec, Inc., MYR Group Inc., and Tutor Perini Corporation. A majority of our revenues are derived from projects requiring competitive bids; however, an invitation to bid is often conditioned upon prior experience, technical capability, and financial strength. Competitive factors in the electrical and mechanical construction services business include: (a) the availability of qualified and/or licensed personnel; (b) reputation for integrity and quality; (c) safety record; (d) cost structure and the ability to control project costs; (e) relationships with customers; (f) price; (g) geographic diversity; (h) experience in specialized markets; (i) the ability to obtain surety bonding; (j) adequate working capital or access to bank credit; and (k) the use of technology such as building information modeling (BIM). We believe our financial position, operating results, access to bank credit and surety bonding, technical expertise including prefabrication and BIM capabilities, and safety record, among other factors, give us an advantage over many of our competitors. However, relatively few barriers exist to prevent entry into the electrical and mechanical construction services industry. While the building services industry is also highly fragmented, with most competitors operating in a specific geographic region, a number of large corporations such as Amentum Services, Inc., IAP Worldwide Services, Inc., Fluor Corporation, J&J Worldwide Services, Cushman & Wakefield plc, CBRE Group, Inc., Jones Lang LaSalle Incorporated, Sodexo, Inc., Aramark, and ABM Industries Incorporated are engaged in this field, as are large original equipment manufacturers such as Carrier Global Corporation and Trane Technologies plc. In addition, we compete with several regional firms serving all or portions of the markets we target, such as BrightView Holdings, Inc., Kellermeyer Bergensons Services, LLC, and SMS Assist, L.L.C. Our principal competitors in the United Kingdom include CBRE Group, Inc., ISS UK Ltd., Equans Services Limited, OCS Group UK Limited, and Mitie Group PLC. The key competitive factors in the building services industry include: (a) availability of qualified personnel and managers; (b) service quality and technical expertise; (c) the use of technology tools and data analytics; (d) cost structure and the ability to control project costs; (e) price; and (f) geographic diversity. Due to our size, our technical capability and management experience, and our geographic presence, we believe our building services operations are in a strong competitive position. However, there are relatively few barriers to entry into the building services industry. The market for providing industrial services includes large national providers, as well as numerous regional companies. In the manufacture of heat exchangers, we compete with both U.S. and foreign manufacturers. Competitors within this industry include JVIC Catalyst Services, Universal Plant Services, Inc., Turner Industries Group, LLC, Team, Inc., Cust-O-Fab, Inc., Dunn Heat Exchangers, Inc., Turn2 Specialty Companies, and Wyatt Field Service Company, LLC, among others. The key competitive factors in the industrial services market consist of: (a) availability of skilled workforce; (b) technical expertise; (c) service, quality, and ability to respond quickly; (d) price; and (e) safety record. Due to our technical capabilities, skilled workforce, and safety record, we believe that we are in a strong competitive position in the industrial services markets that we serve. Although the technical expertise and capital investment that is required in manufacturing heat exchangers may be considered a barrier to entry in this field, there are significantly fewer barriers to entry as it pertains to turnaround projects and services.

Human Capital At December 31, 2023, we employed approximately 38,300 people, approximately 35,000 of whom were located within the United States and approximately 3,300 of whom were located in the United Kingdom. Based on the most recent information available from our latest filing with the U.S. Equal Employment Opportunity Commission, the gender demographic of our U.S. employees was 89% male and 11% female. Additionally, based on such information, our U.S. employees had the following race and ethnicity demographics:

A Diverse and Inclusive Workplace We believe that a diverse and inclusive workforce is important to the long-term success of our business. We actively seek to increase the diversity of our workforce and to practice our commitment to diversity and inclusion in hiring, development, and training, embracing diversity of experience, background, and personal characteristics. This extends to our senior leadership and Board of Directors, where we require that any slate of recruited candidates for a named executive officer or other corporate officer position, and new management-supported director nominees, include a diverse group of individuals. We have also designed and implemented policies and practices to promote a workplace free from discrimination, including our Affirmative Action and Equal Opportunity Policy, the implementation, effectiveness, and reporting requirements of which are overseen by our designated Affirmative Action Officer. We strive to help all our employees realize their full potential with an equal opportunity to succeed. We work to unlock the full potential of all employees at every level through: (a) the EMCOR Manager Certificate Program, which promotes supervisory management skills, (b) our Degree Assistance Program, which provides tuition reimbursement for continuing education, and (c) the resources available to all employees on our online learning platform, EMCOR University Online, which includes thousands of on-demand training courses on a wide range of topics. In furtherance of our EMCOR Values, all EMCOR employees are required to complete inclusive workplace training, and our current and future leaders undergo implicit association training.

•United States industrial services; and •United Kingdom building services. Our operating subsidiaries offer comprehensive and diverse solutions on a broad scale and have many long-standing customer relationships. We provide construction services and building services directly to corporations, municipalities and federal and state governmental entities, owners/developers, and tenants of buildings. We also provide our construction services indirectly by acting as a subcontractor to general contractors, systems suppliers, construction managers, developers, property managers, and other subcontractors. We generally provide industrial services directly to refineries and petrochemical plants. We derive revenues from many different customers in numerous industries, which have operations in several different geographical areas. Of our 2023 revenues, approximately 97% were generated in the United States and approximately 3% were generated in foreign countries, substantially all in the United Kingdom. In 2023, we derived approximately 63% of our revenues from our construction operations, approximately 28% of our revenues from our building services operations, and approximately 9% of our revenues from our industrial services operations. For additional information regarding our revenues, see Note 3 - Revenue from Contracts with Customers of the notes to consolidated financial statements included in Item 8. Financial Statements and Supplementary Data. We believe that our range of service offerings, technical capability, skilled workforce, and strong project execution, along with our safety culture and financial resources, differentiate us from our competition and position us to benefit from future capital and maintenance spending by our customers. Our strategies of expanding our portfolio of service offerings for existing and potential customers and increasing or enhancing our presence in core end markets and geographies, along with our commitment to industry-leading best practices and technological and training capabilities, place us in the position to capitalize on opportunities and trends in the industries we serve and continue to grow our business. Increasingly, our services are focused on delivering sustainable energy solutions, enhancements in energy efficiency, reductions in waste and emissions, and improvements in the safety and comfort of our customers' facilities. The broad scope of our operations is more particularly described below. For detailed segment financial information refer to Note 18 - Segment Information of the notes to consolidated financial statements included in Item 8. Financial Statements and Supplementary Data.

•Millwright services; and •Steel fabrication, erection, and welding services. The electrical and mechanical construction services industry has experienced growth principally due to the increased content, complexity, and sophistication of electrical and mechanical systems resulting, in part, from growth in digital processing, cloud computing, data storage, and the emergence of artificial intelligence. In addition, facilities of all types require extensive electrical distribution systems, sophisticated power supplies, networks of low-voltage and fiber-optic communications cabling, and various mechanical, plumbing, and fire protection and suppression systems. Moreover, the need for substantial environmental controls within a building, due to the heightened need to maintain extensive computer systems at optimal temperatures, and the demand for increased energy efficiency, have continued to expand opportunities for our electrical and mechanical services businesses. The demand for these services is typically driven by non-residential construction and renovation activity and, in recent years, has benefited from the re-shoring of the supply chain, the need for additional high-tech manufacturing facilities, and the energy transition/expansion throughout the United States, all of which have been bolstered by certain government incentives. Our electrical and mechanical construction services generally fall into one of three categories: (a) large installation projects, with contracts often in the multi-million dollar range, that involve: (i) the construction of manufacturing facilities, data centers, warehousing and distribution facilities, and commercial buildings, (ii) institutional and public works projects, or (iii) the fit-out of large blocks of space within commercial or mixed-use buildings, (b) large and medium sized capital and maintenance projects for commercial, manufacturing, pharmaceutical, healthcare, oil and gas, and industrial clients, and (c) smaller installation projects, of a short duration, typically involving fit-out, renovation, and retrofit work. Our United States electrical and mechanical construction operations accounted for approximately 63% of our 2023 total revenues. Of such revenues, approximately 35% were generated by our electrical construction operations and approximately 65% were generated by our mechanical construction operations. Our largest projects typically include those within: (a) the commercial market sector (including warehousing and distribution facilities, office or mixed-use buildings, and shopping malls); (b) the network and communications market sector (including data centers, data and fiber projects, and cabling); (c) the manufacturing and industrial market sector (including steel, pulp and paper mills, food processing and traditional automotive manufacturing facilities, power generation (including sustainable energy solutions such as solar and wind), oil and gas refineries, and chemical processing plants); (d) the high-tech manufacturing market sector (including semiconductor, biotech, life-sciences, and pharmaceutical facilities, as well as projects across the electric vehicle value chain); (e) the healthcare market sector (including hospitals, surgical centers, rehabilitation and nursing facilities, and medical offices); (f) the institutional market sector (including educational and correctional facilities and research laboratories); (g) the water and wastewater market sector; (h) the transportation market sector (including highways, bridges, airports, and transit systems); and (i) the hospitality and entertainment market sector (including resorts, hotels, gaming facilities, convention centers, and sports stadiums). Our largest projects, which typically range in size from $10 million up to and occasionally exceeding $200 million, represented approximately 45% of our electrical and mechanical construction services revenues in 2023. These projects often involve new construction and a combination of design, installation, and start-up services. Depending on the size and complexity of these projects, they may span multiple years and typically require significant technical and management skills and the financial strength to obtain performance bonds, which are often a condition to bidding for and winning these projects. Our projects of less than $10 million accounted for approximately 55% of our electrical and mechanical construction services revenues in 2023. These projects are typically completed in less than one year. They usually involve electrical and mechanical construction services when an end-user or owner undertakes construction or modification of a facility to accommodate a specific use, upgrade or replace aging systems, or increase energy efficiency. These projects frequently require electrical and mechanical systems to meet special needs such as critical systems power supply, fire protection systems, special environmental controls and high-purity air systems, sophisticated electrical and mechanical systems for data centers, new production lines in manufacturing plants, and office arrangements in existing office buildings. They are not usually dependent upon the new construction market. Demand for these projects and types of services is often prompted by the expiration of leases, changes in technology, the demand for more energy efficient systems, or changes in the customer's plant or office layout in the normal course of a customer's business.

•Military base operations support services; and •Infrastructure and building projects for federal, state, and local governmental agencies. While not all of the above services are performed in both countries, we provide building services throughout the United States and United Kingdom. Our building services operations have built upon our traditional electrical and mechanical construction operations and our client relationships to expand the scope of services being offered and to develop packages of services for customers on a local, regional, and national basis. 3 Our building services operations, which generated approximately 28% of our 2023 total revenues, provide services to owners, operators, tenants, and managers of all types of facilities both on a contractual basis for a specified period of time and on an individual task order basis. Of our building services revenues for 2023, approximately 88% were generated in the United States and approximately 12% were generated in the United Kingdom. Demand for our building services is often driven by customers' decisions to focus on their core competencies, customers' programs to reduce costs, the increasing technical complexity of customers' facilities, including their mechanical, electrical, building automation, voice and data, and other systems, and the need for increased reliability, energy efficiency, and air filtration and sanitization. These trends have led to outsourcing and privatization programs whereby customers in both the private and public sectors seek to contract out those activities that support, but are not directly associated with, the customer's core business. Clients of our building services business include federal and state governments, institutional organizations, utilities, healthcare providers, and major corporations engaged in information technology, telecommunications, pharmaceuticals, financial services, and manufacturing, as well as large retailers and other businesses with geographically dispersed locations. We provide building services at a number of prominent buildings in the United States, including those that house the National Archives and Records Administration, the Federal Deposit Insurance Corporation, the Government Accountability Office, and the Departments of Transportation, Education, Health and Human Services, Energy, and Homeland Security, as well as other government facilities, including the NASA Jet Propulsion Laboratory. We also provide building services, as a prime contractor or a subcontractor, to U.S. military bases and various other governmental agencies. The agreements pursuant to which this division provides services to the federal government are frequently for a base period and a number of option years exercisable at the sole discretion of the government, are often subject to modification or renegotiation by the government in terms of scope of services, and are subject to termination by the government prior to the expiration of the applicable term.

Overview We are one of the largest specialty contractors in the United States and a leading provider of electrical and mechanical construction and facilities services, building services, and industrial services. In 2022, we had revenues of approximately $11.1 billion. Our services are provided to a broad range of commercial, industrial, healthcare, utility, and institutional customers through approximately 100 operating subsidiaries, which specialize principally in providing construction services relating to electrical and mechanical systems in all types of facilities and in providing various services relating to the operation, maintenance, and management of those facilities. Such operating subsidiaries are organized into the following reportable segments:

Human Capital At December 31, 2022, we employed approximately 35,500 people, approximately 32,000 of whom were located within the United States and approximately 3,500 of whom were located in the United Kingdom. Based on the most recent information available from our latest filing with the U.S. Equal Employment Opportunity Commission, the gender demographic of our U.S. employees was 90% male and 10% female. Additionally, based on such information, our U.S. employees had the following race and ethnicity demographics:

Employee Demographic% of Total White69 % Hispanic / Latinx18 % Black / African American8 % Asian2 % Multiracial, Native American, Native Hawaiian, and Pacific Islander3 % 5 Approximately 60% of our employees are represented by various unions pursuant to approximately 450 collective bargaining agreements between our individual subsidiaries or trade associations and local unions, as well as two collective bargaining agreements that are national or regional in scope. We believe that our relations with our labor unions are generally positive. Our ability to execute complex projects for our customers, and to perform all of our services with the excellence that makes us an industry leader, depends on our success in attracting and retaining skilled labor in a competitive market. We therefore strive to be and remain an employer of choice for the most talented employees in each of the industries and markets in which we operate. This begins with offering competitive employee compensation and benefits packages, specifically designed to meet the unique needs of each individual in our organization, which include: •Health and Welfare Plans: All full-time employees who do not participate in union plans are offered a range of choices among medical, dental and vision plans, life, accident, dependent and disability insurance, and pre-tax health spending accounts that include employer contributions. •Retirement Savings: We help provide our employees with financial security by offering a 401(k) Savings Plan and an Employee Stock Purchase Plan, both of which include company matching contributions. •Degree Assistance: Eligible employees may apply for reimbursement for job-related courses or courses taken as part of a curriculum for a business or job-related degree at an accredited institution. •Employee Assistance Program: Through our Employee Assistance Program, we offer our employees, and their dependents or household members, access to services and counseling on a variety of personal, professional, legal, and financial matters, at no cost. Most recently, we started offering college counseling services for the children of our employees. Key to our attraction and retention of employees is our commitment to our EMCOR Values and our focus on employee safety and diversity, equity, and inclusion. Our Board of Directors and senior leadership engage in oversight and management, respectively, of our significant human capital initiatives. Our Board of Directors is regularly briefed and provides input on key human capital initiatives and metrics.

Workplace Safety We believe that our focus on employee safety and well-being is reflected in our results. In a year in which our employees worked approximately 77.5 million hours, the Company's Total Recordable Incident Rate in 2022 was approximately 1.2, which was approximately 55% lower than the most recently available industry average of 2.70. This represents our fourteenth consecutive year with a Total Recordable Incident Rate which was less than half the industry average. Our position as an industry leader in safety begins with a strong culture of care and vigilance embodied in our EMCOR Values and is supported by a comprehensive suite of training, resources, and analytics. These include: (a) our signature Be There for Life! Zero Injuries Program and Be Vigilant! Campaign, (b) incident and injury prevention planning, including in-person and online training tools, adoption of new technology, and best practice guides available through our company intranet, (c) enterprise level reporting and analysis of leading and lagging indicators, (d) a 24-hour incident reporting hotline, and (e) a company-wide program to share and champion best safety practices across our range of businesses.

•United States industrial services •United Kingdom building services Our operating subsidiaries offer comprehensive and diverse solutions on a broad scale and have many long-standing customer relationships. We provide construction services and building services directly to corporations, municipalities and federal and state governmental entities, owners/developers, and tenants of buildings. We also provide our construction services indirectly by acting as a subcontractor to general contractors, systems suppliers, construction managers, developers, property managers, and other subcontractors. Our industrial services are generally provided directly to refineries and petrochemical plants. Our revenues are derived from many different customers in numerous industries, which have operations in several different geographical areas. Of our 2022 revenues, approximately 96% were generated in the United States and approximately 4% were generated in foreign countries, substantially all in the United Kingdom. In 2022, approximately 61% of our revenues were derived from our construction operations, approximately 29% of our revenues were derived from our building services operations and approximately 10% of our revenues were derived from our industrial services operations. For additional information regarding our revenues, see Note 3 - Revenue from Contracts with Customers of the notes to consolidated financial statements included in Item 8. Financial Statements and Supplementary Data. We believe that our range of service offerings, technical capability, skilled workforce, and strong project execution, along with our safety culture and financial resources, differentiate us from our competition and position us to benefit from future capital and maintenance spending by our customers. Our strategies of expanding our portfolio of service offerings for existing and potential customers and increasing or enhancing our presence in core end markets and geographies, along with our commitment to industry-leading best practices and technological and training capabilities, place us in the position to capitalize on opportunities and trends in the industries we serve and continue to grow our business. Increasingly, our services are focused on delivering sustainable energy solutions, enhancements in energy efficiency, reductions in waste and emissions, and improvements in the safety and comfort of our customers' facilities, as discussed in further detail below. The broad scope of our operations is more particularly described below. For detailed segment financial information refer to Note 18 - Segment Information of the notes to consolidated financial statements included in Item 8. Financial Statements and Supplementary Data.

United States electrical and mechanical construction and facilities services operations: Our electrical and mechanical construction services primarily involve the design, integration, installation, start-up, operation and maintenance, and provision of services relating to: •Systems for electrical power transmission, distribution, and generation, including power cables, conduits, distribution panels, transformers, generators, uninterruptible power supply systems, and related switch gear and controls; •Sustainable energy solutions such as solar, photovoltaic, and wind, as well as the installation of electric vehicle charging stations; •Premises electrical and lighting systems, including fixtures and controls; •Process instrumentation in the refining, chemical processing, and food processing industries; •Low-voltage systems, such as fire alarm, security, and process control systems; •Voice and data communications, including fiber optic and low voltage cabling, distributed antenna systems, audiovisual systems, and wireless access points; •Roadway and transit lighting and signaling and fiber optic lines; •Computerized traffic control systems, and signal and communication equipment for mass transit systems; •Heating, ventilation, air conditioning, and refrigeration, including both traditional mechanical systems as well as geothermal solutions; •Clean-room process ventilation systems; •Fire protection and suppression systems; •Plumbing, process and high-purity piping systems; •Controls and filtration systems; •Water and wastewater treatment systems; •Central plant heating and cooling systems, including manufacturing and installing sheet metal air handling systems; •Crane and rigging services;

•Millwright services; and •Steel fabrication, erection, and welding services. The electrical and mechanical construction services industry has experienced growth due principally to the increased content, complexity, and sophistication of electrical and mechanical systems resulting, in part, from growth in digital processing, cloud computing, and data storage. In addition, facilities of all types require extensive electrical distribution systems, sophisticated power supplies, networks of low-voltage and fiber-optic communications cabling, and various mechanical, plumbing, and fire protection and suppression systems. Moreover, the need for substantial environmental controls within a building, due to the heightened need to maintain extensive computer systems at optimal temperatures, and the demand for increased energy efficiency, have continued to expand opportunities for our electrical and mechanical services businesses. The demand for these services is typically driven by non-residential construction and renovation activity and, in recent years, has benefited from the re-shoring of the supply chain, the need for additional high-tech manufacturing facilities, and the energy transition/expansion throughout the United States. Our electrical and mechanical construction services generally fall into one of three categories: (a) large installation projects, with contracts often in the multi-million dollar range, that involve: (i) the construction of manufacturing facilities, data centers, warehousing and distribution facilities, and commercial buildings, (ii) institutional and public works projects, or (iii) the fit-out of large blocks of space within commercial or mixed-use buildings, (b) large and medium sized capital and maintenance projects for commercial, manufacturing, pharmaceutical, healthcare, oil and gas, and industrial clients, and (c) smaller installation projects, of a short duration, typically involving fit-out, renovation, and retrofit work. Our United States electrical and mechanical construction operations accounted for approximately 61% of our 2022 total revenues. Of such revenues, approximately 36% were generated by our electrical construction operations and approximately 64% were generated by our mechanical construction operations. Our largest projects typically include those: (a) for commercial purposes (such as office buildings, data centers, convention centers, sports stadiums, and shopping malls); (b) for high-tech manufacturing purposes (such as semiconductor, biotech, life-sciences, and pharmaceutical facilities); (c) for traditional manufacturing and industrial purposes (such as steel, pulp and paper mills, food processing and automotive manufacturing facilities, power generation (including sustainable energy solutions such as solar and wind), oil and gas refineries, and chemical processing plants); (d) for transportation purposes (such as highways, bridges, airports, and transit systems); (e) for institutional purposes (such as educational and correctional facilities and research laboratories); (f) for healthcare purposes (such as hospitals, surgical centers, rehabilitation and nursing facilities, and medical offices); (g) for water and wastewater purposes; and (h) for hospitality purposes (such as resorts, hotels, and gaming facilities). Our largest projects, which typically range in size from $10 million up to and occasionally exceeding $200 million, represented approximately 40% of our electrical and mechanical construction services revenues in 2022. These projects often involve new construction and a combination of design, installation, and start-up services. Depending on the size and complexity of these projects, they may span multiple years and typically require significant technical and management skills and the financial strength to obtain performance bonds, which are often a condition to bidding for and winning these projects. Our projects of less than $10 million accounted for approximately 60% of our electrical and mechanical construction services revenues in 2022. These projects are typically completed in less than one year. They usually involve electrical and mechanical construction services when an end-user or owner undertakes construction or modification of a facility to accommodate a specific use, upgrade or replace aging systems, or increase energy efficiency. These projects frequently require electrical and mechanical systems to meet special needs such as critical systems power supply, fire protection systems, special environmental controls and high-purity air systems, sophisticated electrical and mechanical systems for data centers, new production lines in manufacturing plants, and office arrangements in existing office buildings. They are not usually dependent upon the new construction market. Demand for these projects and types of services is often prompted by the expiration of leases, changes in technology, the demand for more energy efficient systems, or changes in the customer's plant or office layout in the normal course of a customer's business.

United States and United Kingdom building services operations: Our building services include: •Mobile mechanical maintenance and services for mechanical, electrical, plumbing, fire safety, and building automation systems; •Modification and retrofit projects; •Program development, management, and maintenance for energy systems, including LEED and other sustainable solutions to assist our customers in reducing energy consumption; •Technical consulting and diagnostic services; •Services aimed at improving indoor air quality; •Installation and support for building systems; •Commercial and government site-based operations and maintenance; •Facility management, maintenance, and services; •Floor care and janitorial services, including enhanced cleaning and sanitization services; •Landscaping, lot sweeping, and snow removal; •Other building services, including reception, security, and catering services; •Vendor management and call center services;

•Military base operations support services; and •Infrastructure and building projects for federal, state, and local governmental agencies. While not all of the above services are performed in both countries, we provide building services throughout the United States and United Kingdom. Our building services operations have built upon our traditional electrical and mechanical construction operations and our client relationships to expand the scope of services being offered and to develop packages of services for customers on a local, regional, and national basis. 3 Our building services operations, which generated approximately 29% of our 2022 total revenues, provide services to owners, operators, tenants, and managers of all types of facilities both on a contractual basis for a specified period of time and on an individual task order basis. Of our building services revenues for 2022, approximately 85% were generated in the United States and approximately 15% were generated in the United Kingdom. Demand for our building services is often driven by customers' decisions to focus on their core competencies, customers' programs to reduce costs, the increasing technical complexity of customers' facilities, including their mechanical, electrical, building automation, voice and data, and other systems, and the need for increased reliability, energy efficiency, and air filtration and sanitization. These trends have led to outsourcing and privatization programs whereby customers in both the private and public sectors seek to contract out those activities that support, but are not directly associated with, the customer's core business. Clients of our building services business include federal and state governments, institutional organizations, utilities, healthcare providers, and major corporations engaged in information technology, telecommunications, pharmaceuticals, financial services, and manufacturing, as well as large retailers and other businesses with geographically dispersed locations. We provide building services at a number of prominent buildings in the United States, including those that house the National Archives and Records Administration, the Federal Deposit Insurance Corporation, the Government Accountability Office, and the Department of Health and Human Services, as well as other government facilities, including the NASA Jet Propulsion Laboratory. We also provide building services, as a prime contractor or a subcontractor, to U.S. military bases, including the Defense Intelligence Agency located on Joint Base Anacostia-Bolling, and are involved in a joint venture providing building services to NASA's Armstrong Flight Research Center. The agreements pursuant to which this division provides services to the federal government are frequently for a base period and a number of option years exercisable at the sole discretion of the government, are often subject to renegotiation by the government in terms of scope of services, and are subject to termination by the government prior to the expiration of the applicable term.