UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K, including all documents incorporated by reference, contains forward-looking statements regarding Limbach Holdings, Inc. (the “Company,”“Company” “Limbach” “we” or “our”) and represents our expectations and beliefs concerning future events. These forward-looking statements are intended to be covered by the safe harbor for forward-looking statements provided by the Private Securities Litigation Reform Act of 1995. Forward-looking statements involve known and unknown risks and uncertainties. The forward-looking statements included herein or incorporated herein by reference include or may include, but are not limited to, (and you should read carefully) statements that are predictive in nature, depend upon or refer to future events or conditions, or use or contain words, terms, phrases, or expressions such as “achieve,” “forecast,”, “plan,” “propose,” “strategy,” “envision,” “hope,” “will,” “continue,” “potential,” “expect,” “believe,” “anticipate,” “project,” “estimate,

“estimate,” “predict,” “intend,” “should,” “could,” “may,” “might,” or similar words, terms, phrases or expressions or the

These forward-looking statements are based on information available as of the date of this Annual Report on Form 10-K and the Company management’s'managements' current expectations, forecasts and assumptions, and involve a number of judgments, known and unknown risks and uncertainties and other factors, many of which are outside the control of the Company and its directors, officers and affiliates. Accordingly, forward-looking statements should not be relied upon as representing the Company's views as of any subsequent date. The Company does not undertake any obligations to update, add or to otherwise correct any forward-looking statements contained herein to reflect events or circumstances after the date they were made, whether as a result of new information, future events, inaccuracies that become apparent after the date hereof or otherwise, except as may be required under applicable securities laws.

As a result of a number of known and unknown risks and uncertainties, the Company's results or performance may be materially different from those expressed or implied by these forward-looking statements. Some factors that could cause actual results to differ are set forth under the heading “Risk Factor Summary” below and those described under Part I, Item 1A1A. “Risk Factors” of thein this Annual Report on Form 10-K.

The Company's business involves significant risks and uncertainties that make an investment in it speculative and risky. The following is a summary list of the principal risk factors that could materially adversely affect the Company's business, financial condition, liquidity and results of operations. These are not the only risks and uncertainties the Company faces, and you should carefully review and consider the full discussion of the Company's risk factors in the section titled “Risk Factors”, together with the other information in this Annual Report on Form 10-K.

Risks Related to Our Business and Industry

As of December 31, 2021,2022, the Company’s wholly-owned subsidiaries included Limbach Company LLC (“LC LLC”), which operates in New England, Eastern Pennsylvania, Western Pennsylvania, New Jersey, Ohio, Michigan and the Mid-Atlantic region; Limbach Company LP (“LC LP”), which operates in the Southern California region; Harper Limbach LLC (“Harper Limbach”), a Florida-based subsidiary, and Jake Marshall, LLC (“JMLLC”) and Coating Solutions, LLC (“CSLLC”), both of which are Tennessee-based subsidiaries.subsidiaries and Limbach Facility & Project Solutions LLC. Each of our operations provide design, construction and maintenance services in some or all of the HVAC, plumbing and electrical fields.

See Note 3 – Acquisitions in the accompanying notes to the Company’s consolidated financial statements for further information on the Jake Marshall Transaction.

Segments

The Company operates in two segments, which were renamed as of January 1, 2021 to reflect the Company's two distinct approaches to its customer base and to better align with its owner direct strategy. The previously named Construction segment is now known as(i) General Contractor Relationships (“GCR”); the previously named Service segment is now known as Owner Direct Relationships (“ODR”). The Company's operating segments are based on the relationship with its customers, (i) GCR,, in which the Company generally manages new construction or renovation projects that involve primarily HVAC, plumbing, or electrical services awarded to the Company by general contractors or construction managers, and (ii) ODR,Owner Direct Relationships (“ODR”), in which the Company performs owner direct construction projects and/or provides maintenance or serviceservices primarily on HVAC, plumbing or electrical systems, building controls and specialty contracting projects direct to, or assigned by, building owners or property managers. This work is primarily performed under fixed price, modified fixed price, and time and material contracts over periods of typically less than two years.

The Company’s key business initiatives for its ODR segment include the establishment of long-term relationships with building owners on a direct basis as compared to contracting with a GC/CM. The Company strives to convert GCR projects into ODR business opportunities. The CompanyIn addition, the Company’s ODR segment has been successful in converting GCR projects into long-term maintenance contractssuccessfully scaleable through organic business growth while working directly with building owners; however, aowners. A large portion of the Company’s maintenance services are delivered to building owners for whom the Company has not performed construction or renovation services. Accordingly, the Company’s ODR platform can operate on a standalone basis or in conjunction with its GCR platform. The Company believes that its ODR services offerings provide a distribution channel through which it can continue to deliver an expanded offering of value-added services direct to building owners that further reinforces its value proposition and differentiated capabilities. The Company’sCompany provides its ODR business includes multipleservices through both a variety of project delivery methodologies and other service and technical offerings, often delivered pursuant to renewable, “evergreen” contracts and provides generally for the following revenue and gross profit streams:offerings:

DueThe Company’s aforementioned ODR business services profile offers recurring and/or repeatable business opportunities. In addition, due to the Company’s on-going contractual relationships with certain building owners established through certain of its maintenance services,service offerings, it is well positioned with those owners when they are ready to initiate major capital construction projects. As a result, the Company’sCompany's maintenance, servicestime-and-materials, ATC, SPD and Limbach Insights often lead, to and help drive and support the growth of its HVAC, plumbing and electrical construction business.revenue associated with owner direct projects.

For additional financial information about the Company’s operating segments, see Note 1112 – Operating Segments in the accompanying notes to the Company’s consolidated financial statements.

The core capability of LCS is professional engineering. Combined throughout the Company’s business, it maintains eightseven registered professional engineers on staff, who are supported by a staff of approximately 3331 estimators and designers. LCS acts as the engineer of record for projects where the Company serves as a Design/Build specialty contractor. LCS engineers have experience in healthcare, institutional, commercial, hospitality, and industrial projects. The Company’s operations in all of its regions have complete access to a large staff of professional engineers and designers through LCS. LCS controls the development and maintenance of the Company’s Limbach Modeling and Production System (“LMPS”). LMPS is a comprehensive database, workflow, and reporting system used by LCS and all of the Company’s branchesbusiness units to design, estimate, plan, and track construction projects. The Company believes LMPS is unique in the industry and provides a competitive advantage by providing highly technical services in-house in a cost effective manner. LMPS is a Building Information Modeling (“BIM”) tool that allows the Company to construct mechanical, electrical and plumbing engineering (“MEP”) systems in a virtual environment, avoid conflicts in the field, eliminate rework caused by coordination issues, maximize the use of off-site prefabrication of assemblies, and capture installation productivity and construction progress. The Company utilizes LMPS beginning with the original engineering concept and throughout the construction process to continuously monitor progress and avoid wasted efforts. Many others in the industry expend additional costs to third parties for redrawing and remodeling effort to achieve the same results.

The Company focuses on creating value for building owners by targeting opportunities for long-term relationships.relationships with the vision of becoming an indispensable partner to building owners with mission-critical systems. The key objectives of the

Company’s strategy is to improve profitability and generate quality growth in its operations, to enable sustainable and efficient building environments, to continue investing in its workforce and to acquire strategically synergistic businesses. In order to accomplish the Company’s objectives, it is currently focused on the following areas:

The Company continues to expand its owner-direct offerings to include other digital solutions to manage and monitor the performance of building systems, including data analytics, energy consumption and sustainability. These services allow the Company to develop new revenue streams leveraging its professional services capabilities, to support multi-location regional and national customers in core end-markets, and to drive energy retrofit and performance optimization projects for building owners.

The Company also partners with building owners in other market sectors (infrastructure, government, hospitality and commercial). It is particularly focused on expandingimperative that the partnerships formed between the Company and its top four sectors noted above (healthcare, education, mission critical facilities and industrial manufacturing facilities), leveraging itsbuilding owners share in similar core areas of expertise and targeting projects with optimal risk/reward characteristics.values.

Complex systems lend themselves to delivery methodologies that fit the Company’s value proposition to its customers and integrated business model, including design/assistDesign/Assist and design/build.Design/Build. The Company believes that few specialty contractors in the United States offer fully integrated HVAC, plumbing and electrical services. The Company believes its integrated approach provides a significant competitive advantage, especially when combined with ourits proprietary design and production software systems. The Company’s integrated approach allows for increased prefabrication of HVAC components, improved cycle times for project delivery and reduced risks associated with onsite construction.

In 2021,2022, the Company was ranked the 7th11th largest mechanical contractor in the United States according to information provided by Engineering News Record.

GCR and ODR Backlog

The Company’s GCR backlog was $337.2$302.9 million and $393.5$337.2 million as of December 31, 20212022 and 2020,2021, respectively. Projects are brought into backlog once the Company has been provided a written confirmation of award and the contract value has been established. At any point in time, the Company has a substantial volume of projects that are specifically identified and advanced in negotiations and/or documentation, however those projects are not booked as backlog until the Company has received written confirmation from the owner or the GC/CM of their intention to award it the contract and they have directed the Company to begin engineering, designing, incurring construction labor costs or procuring needed equipment and material. The Company’s GCR projects tend to be built over a 12- to 24-month schedule depending upon scope and complexity. Most major projects have a preconstruction planning phase which may require months of planning before actual construction commences. The Company is occasionally employed to deliver a “fast-track” project, where construction commences as the preconstruction planning work continues. As work on the Company’s projects progress, it increases or decreases backlog to take into account its estimate of the effects of changes in estimated quantities, changes in conditions, change orders and other variations from initially anticipated contract revenue, and the percentage of completion of the Company’s work on the projects. Based on historical trends, the Company estimates that 65%68% of its GCR backlog as of December 31, 20212022 will be recognized as revenue during 2022.2023. Additionally, the reduction in GCR backlog has been intentional as the Company looks to focus on higher margin projects than historically, as well as its focus on smaller, higher margin owner direct projects. As of December 31, 2021, GCR

The Company’s ODR backlog was $98.0$108.2 million and $50.9$98.0 million as of December 31, 20212022 and 2020,2021, respectively. These amounts reflect unrecognized revenue expected to be recognized over the remaining terms of our service contracts and projects.

Based on historical trends, the Company estimates that 69%92% of its ODR backlog as of December 31, 20212022 will be recognized as revenue during 2022.2023. The Company believes its ODR backlog increased due to its continued focus on ODR growth. In addition, as of December 31, 2021, ODR backlog included approximately $22.6 million of backlog associated with the operations of the entities acquired in the Jake Marshall Transaction.

Customers

The Company’s customer base primarily consists of building owners and their third-party representatives, general contractors and construction managers.

The Company’s aforementioned strategic goals include continued growth of its direct relationships with building owners. Building owners control capital and operating investments. This not only improves the Company’s position when entering into construction contracts with these owners, but also allows it to build long-term relationships around recurring maintenance services and smaller repair and installation projects. This also positions the Company to deliver additional products and services in the future, including digital offerings. In its typical customer life cycle, the Company pursues opportunities to build or renovate facilities through a GC/CM. In most cases, this relationship is the Company’s primary point of entry into the building owner’s organization. However, the Company maintains hundreds of building owner relationships through its contracts for program management, maintenance, smaller project renovations and energy retrofits. In the Company’s experience, when building owners are planning a project that involves predominantly HVAC, plumbing and/or electrical services, they often ask the GC/CM to assign the work directly to the Company. For the year ended December 31, 2021,2022, no direct ODR customer relationship accounted for more than 10% of the Company’s revenue.

The Company believes it has strong relationships with many national commercial GC/CMs. As one of its core risk management processes, the Company is selective in choosing to work with GC/CMs that have similar core values, that have a solid payment history, that have experienced and available project management labor, and who value the Company’s services and reputation. Most of the Company’s branches also maintain strong relationships with local and regional GC/CMs that fit its selection criteria. For the year ended December 31, 2022, one GCR segment customer accounted for approximately 11% of consolidated total revenue. For the year ended December 31, 2021, two GCR segment customers accounted for approximately 17% and 12% of consolidated total revenue. For the year ended December 31, 2020, the Company had one GCR segment customer that accounted for approximately 14% of consolidated total revenue.revenue, respectively.

Competition

The HVAC, plumbing, electrical, and maintenance industry is highly competitive and the geographic markets in which the Company competes has numerous companies that provide similar services. Factors influencing the Company’s competitiveness include price, reputation for quality, ability to reduce customer costs, experience and expertise, financial strength, surety bonding capacity, knowledge of local markets and conditions, availability and experience of craft labor, and customer relationships. Competitors tend to be regional firms that vary in size and depth of resources. There are, however, significant national competitors that have greater national presence and breadth of expertise than the Company does.

Materials & Equipment

Human Capital

To ensure that the Company is well positioned to provide innovative system solutions and reliable services in a safe, efficient and responsible manner, the Company seeks to employ and retain a team of highly dedicated and accomplished people who genuinely care about the success of the Company. Creating an engaging workplace environment that provides for competitive pay and

pay and benefits, attractive career development opportunities, and a collaborative, respectful culture further enables the Company to achieve continued success.

The Company’s culture is driven by its Core Values:

As such, the Company has committed itself to the health, safety and well-being of its workers and their families. One of the ways the Company shows its commitment is through offering competitive employee compensation and benefits packages, specifically designed to meet the unique needs of each individual in its organization, which include:

This program helped earn the Company’s Ohio location,business unit the highest honor for which Occupational Safety and Health Administration (“OSHA”) can name a company; OSHA-Voluntary Protection Programs Star Site. This was the first time a union mechanical contractor has earned such an honor in the United States. The Company strives to achieve this honor at its other locations.business units.

Seasonality

Severe weather can impact the Company’s operations. In the northern climates where it operates, and to a lesser extent the southern climates as well, severe winters can slow the Company’s productivity on construction projects, which shifts revenue and gross profit recognition to a later period. The Company’s maintenance operations may also be impacted by mild or severe weather. Mild weather tends to reduce demand for the Company’s maintenance services, whereas severe weather may increase the demand for its maintenance and spottime-and-materials services.

Impact of the COVID-19 Pandemic

In March 2020, the World Health Organization declared the outbreak of the coronavirus disease 2019 (“COVID-19”) a global pandemic. The COVID-19 pandemic has caused significant disruption and volatility on a global scale resulting in, among other things, an economic slowdown, impacts to global supply chains, and the possibility of a continued economic recession. In limited instances, during fiscal 2020, the Company faced disruptions due to the COVID-19 pandemic as certain projects chose to shutdown work irrespective of the existence or applicability of government action. In most markets, construction iswas considered an essential business and the Company continued to staff its projects and perform work during fiscal 2020 and into 2021, and most of the projects that were in progress at the time that the shutdowns commenced were restarted.

As new variants of the virus emerge, the Company remains cautious as many factors remain unpredictable. The Company actively monitors and responds to the changing conditions created by the pandemic, with focus on prioritizing the health and safety of the Company’s employees, dedicating resources to support the Company’s communities, and innovating to address the Company’s customers’ needs. During 2021, the Company faced impacts of both the Delta and Omicron variants, with disruptions to the Company’s workforce, which impacted revenue.

Supply chain disruptions, material shortages and escalating commodity prices as a result of COVID-19 are expected to continue into 2022. During the fourth quarter of 2021,Although the Company was impacted by supply chain issues delaying equipment delivery, which resulted in revenue being pushedcontinues to future periods. The impactrecover from the financial impacts of the COVID-19 pandemic and related government orders implemented to mitigate it, the broader and longer-term implications the pandemic has on the Company’s vendorsglobal economy continue to develop. Economic disruptions, including supply chain, production, and other logistical issues, as well as escalating commodity prices, have and may continue to negatively impact our business. For example, we are experiencing lead times significantly in excess of normal levels while also experiencing the effects of inflation through increases in fuel, material, and other commodity prices. These disruptions have escalated in 2022 and have manifested themselves most notably through project delays and reduced labor productivity and efficiency, particularly within our GCR segment. In response to these challenges, the Company continues to strive to more effectively manage its business through enhanced labor planning and project scheduling, increased pricing to the extent contractually permitted, and availabilityby leveraging the Company's relationships with its suppliers and customers. However, the impact of materials or supplies utilized in the Company’s operationsthese disruptions continues to evolve and may have an adverse impact on the Company’s operationsconflict in Ukraine has added another layer of uncertainty. There can be no assurance that the Company's actions will serve to mitigate such impacts in future periods. The Company continues to monitor the short- and long-term impacts of the pandemic, including the current supply chain disruptions.

The Company continues to monitor developments involving the Company’sour workforce, customers, suppliers and vendors and take steps to mitigate against additional impacts, but given the unprecedented and evolving nature of these circumstances, the Companyit cannot predict the full extent of the impact that the economic disruptions caused by COVID-19 will have on the Company’sCompany's operating results, financial condition and liquidity.

Government and Environmental Regulations

The Company is subject to various federal, state and local laws and regulations relating to the environment, including those relating to discharges to air, water and land, the handling and disposal of solid and hazardous waste, the handling of underground storage tanks and the cleanup of properties affected by hazardous substances. The Company also is subject to compliance with numerous other laws and regulations of federal, state, local agencies, and authorities, including those relating to workplace safety, wage and hour, and other labor issues (including the requirements of the Occupational Safety and Health Act and comparable state laws), immigration controls, vehicle and equipment operations and other aspects of its business. In addition, a relatively limited number of the Company’s construction contracts are entered into with public authorities, and these contracts frequently impose additional requirements, including requirements regarding labor relations and subcontracting with designated classes of disadvantaged businesses. A large portion of the Company’s business uses labor that is provided under collective bargaining agreements. As such, the Company is subject to federal laws and regulations related to unionized labor and collective bargaining (including the National Labor Relations Act).

The Company continually monitors its compliance with these laws, regulations and other requirements. While compliance with existing laws, regulations and other requirements has not materially adversely affected the Company’s operations in the past,

and it is not aware of any proposed requirements that the Company anticipates will have a material impact on its operations, there can be no assurance that these requirements will not change or that compliance will not otherwise adversely affect the Company’s operations in the future. In addition, while the Company typically passes any costs of compliance on to its customers under the applicable project agreement, either directly or as part of its estimate depending on the type of contract, there can be no assurance that the Company will not incur compliance expenses in the future that materially adversely affect its results of operations. Furthermore, certain environmental laws impose substantial penalties for non-compliance and other laws, such as the federal Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”), and comparable state laws, impose strict, retroactive, joint and several liability upon persons that contribute to the release of a “hazardous substance” into the environment. These persons include the owner or operator of the site where the release occurred and companies that disposed or arranged for the disposal of the hazardous substances found at the site.

Climate Change and Sustainability

The Company recognizes its environmental and societal responsibilities and is committed to sustainability and to improving its environmental footprint as well as operating its business in a manner that seeks to protect the health and safety of the Company’s employees and customers, as well as the public. The Company’s focus on environmental stewardship and improving productivity drives not only its efforts to become more energy efficient but also improvements in the Company’s customers' impact on climate change. Replacing an aging building’s existing systems with modern, energy-efficient systems significantly reduces a building’s energy consumption and carbon footprint while improving cost, air quality, and overall system effectiveness.

The Company is subject to the requirements of numerous federal, state, and local laws, regulations, and rules that promote the protection of the environment. While capital expenditures or operating costs for environmental compliance cannot be predicted with certainty, the Company does not currently anticipate that they will have a material effect on its capital expenditures or competitive position in the short term.

The Company’s internet address is https://www.limbachinc.com. The Company makes available, free of charge, on its Internet website copies of the Company’s annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports as soon as reasonably practicable after the Company electronically files such material with, or furnishes it to, the SEC.

Risks Related to Our Business and Industry

The markets we serve are highly fragmented and competitive. The non-residential contracting industry is characterized by numerous companies, many of which are small and whose activities are often geographically concentrated. We compete on the basis of our technical expertise and experience, financial and operational resources, industry reputation and dependability. While we believe our customers consider a number of these factors in awarding available contracts, price is often the principal factor in determining which contractor is selected, especially on smaller, less complex projects. As such, smaller competitors are sometimes able to win bids for such projects based on price alone due to their lower cost and financial return requirements. We expect competition to remain intense for the foreseeable future, presenting us with significant challenges in our ability to

maintain strong growth rates and acceptable profit margins. We also expect increased competition from in-house service providers as some of our customers have employees who perform service and maintenance work similar to the services we provide as part of our ODR offering. Vertical consolidation is also expected to intensify competition in the industry. In addition, new and emerging technologies and services are expected to significantly impact the industry in coming years. If we are unable to meet these competitive challenges, we could lose market share to our competitors and experience an overall reduction in our profits. In addition, our profitability could be impaired if we have to reduce prices to remain competitive.

The growth we have experienced in the past, and that we may experience in the future, may provide challenges to our organization, requiring us to expand our personnel and operations. Future growth, whether organic or through acquisitions, may strain our infrastructure, operations and other managerial and operating resources. We have also experienced severe constriction in the markets in which we operated in the past and, as a result, in our operating requirements. Failing to maintain the appropriate cost structure for a particular economic cycle may result in us incurring costs that affect our profitability. If our business resources become strained or overly-burdensome, our earnings may be adversely affected and we may be unable to increase revenue growth. Further, we may undertake contractual commitments that exceed our labor resources, which could also adversely affect our earnings and ability to increase revenue growth.

Due to the size and nature of our regional construction contracts, one or a few customers have in the past, and may in the future, represent a substantial portion of our consolidated revenue and gross profits in any one year or over a period of several consecutive years. For example, for the year ended December 31, 2022, one GCR segment customer accounted for approximately 11% of consolidated total revenue. For the year ended December 31, 2021, two GCR segment customers accounted for approximately 17% and 12% of consolidated total revenue. For the year ended December 31, 2020, the Company had one GCR segment customer that accounted for approximately 14% of consolidated total revenue.revenue, respectively. Similarly, our backlog frequently reflects multiple contracts for a limited number of customers; therefore, one customer may comprise a significant percentage of backlog at a certain point in time. The loss of business from any one of such customers could have a material adverse effect on our business or results of operations.operations; however, our customer base continues to shift to a more ODR-centric direction, which typically yield projects that are of less risk and smaller in nature. Also, a default or delay in payment on a significant scale by a customer may have a material adverse effect on our financial position, results of operations and cash flows.

We cannot guarantee that the revenue projected in our contract backlog will be realized or, if realized, will be profitable. Projects reflected in the contract backlog may be affected by project cancellations, scope adjustments, time extensions or other changes. Such changes may materially and adversely affect the revenue and profit we ultimately realize on these projects.

Our contract prices are established largely upon estimates and assumptions of our projected costs, including assumptions about future economic conditions; prices, including commodities prices; availability of labor; the costs of providing labor, equipment, and materials; and other factors outside of our control. If our estimates or assumptions prove to be inaccurate, due to changing circumstances change or our failure to successfully execute the work, cost overruns may occur and we could experience reduced profits or a loss for affected projects. For instance, unanticipated technical problems may arise; we could have difficulty obtaining permits or approvals; local laws, labor costs or labor conditions could change; bad weather could delay construction; prices of raw materials could increase; suppliers or subcontractors may fail to perform as expected; or site conditions may be different than expected.originally anticipated. We are also exposed to increases in energy prices. Additionally, in certain circumstances, we guarantee project completion or the achievement of certain acceptance and performance testing levels by a scheduled date. Failure to meet schedule or performance requirements typically results in additional costs to us, and in some cases may also create liability for consequential and liquidated damages. Performance problems for existing and future projects could also cause our actual results of operations to differ materially from those anticipated and could damage our reputation within the industry and our customer base.

In addition, the costs incurred and gross profit realized on our contracts can vary, sometimes substantially, from our original projections due to a variety of factors, including, but not limited to:

Many of our customer contracts contain provisions that purport to shift some or all of the above risks from the customer to us, even in cases where the customer is partly at fault. We are not always able to shift this risk to subcontractors. Our experience has been that customers are willing to negotiate equitable adjustments in the contract compensation or completion time provisions if unexpected circumstances arise. However, customers may seek to impose contractual risk-shifting provisions more aggressively, which could increase risks and adversely affect our financial position, results of operations and cash flows.

The timing of project awards is unpredictable and outside of our control. Project awards often involve complex and lengthy negotiations and competitive bidding processes. These processes can be impacted by a wide variety of factors, including a customer’s decision to not proceed with the development of a project, governmental approvals, financing contingencies, commodity prices, environmental conditions, and overall market and economic conditions. We may not win contracts that we have bid upon for any number of reasons, including price, a customer’s perception of our ability to perform, a competitor’s relationships and/or perceived technology advantages held by others. Many of our competitors may be more inclined to take greater or unusual risks or accept terms and conditions in a contract that we might not deem acceptable. Because a significant portion of our revenue is generated from large projects, our results of operations can fluctuate quarterly and annually depending on whether, and when, large project awards occur, as well as the commencement and progress of work under large contracts already awarded. As a result, we are subject to the risk of losing new awards to competitors or the risk that revenue may not be derived from awarded projects as quickly as anticipated.

The uncertainty of the timing of project awards may also present difficulties in matching the size of our work crews with project needs. In some cases, we may maintain and bear the cost of more ready work crews than are currently required in anticipation

of future needs for existing contracts or expected future contracts. If a project is delayed or an expected project award is not received, we would incur costs that could have a material adverse effect on our anticipated profit.

In addition, the timing of the revenue, earnings and cash flows from our contracts in backlog could be delayed by a number of factors, including adverse weather conditions; other subcontractors delaying the progression of proceeding work; delays in receiving material and equipment from suppliers and services from subcontractors; and changes in the scope of work to be performed. Such delays, if they occur, could have material and adverse effects on our operating results for current and future periods until the affected contracts are completed.

After the award of a contract, we may perform additional work that was not contemplated in our original contract price, at the request or direction of the customer, without the benefit of an approved change order. Our contracts generally afford the customer the right to order such changed or additional work, and typically require the customer to compensate us for the additional work. If we are unable to successfully negotiate a change order, or fail to obtain adequate compensation for these matters, we could be required to record in the current period an adjustment to revenue and profit recognized in prior periods. Such adjustments, if substantial, could have a material adverse effect on our financial position, results of operations and cash flows.

In certain circumstances, we assert or have asserted claims against project contractors, owners, engineers, consultants, subcontractors or others involved in a project for additional costs exceeding the contract price or for amounts not included in the original contract price. These types of claims occur due to matters such as delays, inefficiencies or errors caused by others or changes from the initial project scope, all of which may result in additional costs. Often, these claims can be the subject of lengthy negotiations, arbitration or even litigation proceedings, and it is difficult to accurately predict when and on what terms these claims will be ultimately resolved.

The potential impact of recoveries for claims may be material in future periods when they, or a portion of them, become probable and estimable or are settled and therefore these claims have the ability to negatively impact our results of operations and financial condition. For example, we could have estimated and reported a profit on a contract over several periods and later

In addition, when these types of claims are made, we may use or have used working capital to cover cost overruns pending the resolution of the relevant claims and may incur additional costs when pursuing such potential recoveries. A failure to recover on these types of claims promptly and fully could have a negative impact on our financial position, results of operations, cash flows and liquidity. Moreover, our use of working capital to cover cost overruns related to pending claims may impact our ability to meet our credit agreement covenants or limit the use of our credit agreements. If we default under our credit agreements, it could result in, among other things, us no longer being entitled to borrow under one or more of the credit agreements, acceleration of the maturity of outstanding indebtedness under the agreements, foreclosure on collateral securing the obligations under the agreements or require us to enter into amendments and/or waivers to those credit agreements that may place additional requirements on us and that cost us additional amounts payable to our lenders.

We operate from various locations across the United States, supported by corporate executives and services, with local branchbusiness unit management retaining responsibility for day-to-day operations and adherence to applicable laws. We believe that our practice of placing significant decision making powers with local management is important to our successful growth and allows us to be responsive to opportunities and to our customers’ needs. However, this practice can make it difficult to coordinate

procedures across our operations and presents certain risks, including the risk that we may be slower or less effective in our attempts to identify or react to problems affecting an important business issue than we would under a more centralized structure, or that we would be slower to identify a misalignment between a subsidiary’s and our overall business strategy. If a subsidiary location fails to follow our compliance policies, we could be made party to a contract, arrangement or situation with exposure to large liabilities or that has less advantageous terms than is typically found across the markets in which we operate. Likewise, inconsistent implementation of corporate strategy and policies at the local level could materially and adversely affect our financial position, results of operations, and cash flows and prospects.

The operating results of an individual location may differ from those of another location for a variety of reasons, including market size, local customer base, regional construction practices, competitive landscape, regulatory requirements, state and local laws and local economic conditions. As a result, certain of our locations may experience higher or lower levels of profitability and growth than other locations.

Recent or potential acquisitions, divestitures, or other strategic transactions may involve a number of risks including, but not limited to:

In connection with any acquisitions, we may acquire liabilities or defects such as legal claims, including but not limited to third party liability and other tort claims; claims for breach of contract; employment-related claims; environmental liabilities, conditions or damage; permitting, regulatory or other compliance with law issues; or tax liabilities. If we acquire any of these liabilities, and they are not adequately covered by insurance or an enforceable indemnity or similar agreement from a creditworthy counterparty, we may be responsible for significant out-of-pocket expenditures. In connection with any divestitures, we may incur liabilities for breaches of representations and warranties or failure to comply with operating covenants under any agreement for a divestiture. In addition, we may indemnify a counterparty in a divestiture for certain liabilities of the subsidiary or operations subject to the divestiture transaction. These liabilities, if they materialize, could have a material adverse effect on our business, financial condition, and results of operations.operations and cash flows.

We may pursue selective acquisitions to grow our business. We cannot provide assurance that we will be able to identify suitable acquisition targets or that we will be able to consummate acquisitions on terms and conditions acceptable to us, or that acquired businesses will be profitable. Acquisitions may expose us to additional business risks different than those we have traditionally experienced. We also may encounter difficulties or failure integratingto integrate acquired businesses and successfully managing the growth we expect to experience from these acquisitions.

We may choose to finance future acquisitions with debt, equity, cash or a combination of the three. Future acquisitions could dilute earnings. To the extent we succeed in making acquisitions, a number of risks may result, including:

Furthermore, the costs associated with a failed acquisition or attempted acquisition transaction could have an adverse effect on our financial position, results of operations and cash flows.

Design/buildBuild projects provide the customer with a single point of responsibility for both design and construction. When we are awarded these projects, we typically perform the design and engineering work in-house. On other projects, we are not the designer, but provide assistance directly to the project design team. In the event that a design error or omission by us causes damage, there is risk that we, our subcontractors or the respective professional liability or errors and omissions insurance would not be able to absorb the liability. Any liability resulting from an asserted design defect with respect to our projects may have a material adverse effect on our financial position, results of operations and cash flows.

Due to the nature of our contracts, we sometimes commit resources to projects prior to receiving payments from the customer in amounts sufficient to cover expenditures on projects as they are incurred. Delays in customer payments may require us to make a working capital investment. If a customer defaults in making their payments on a project to which we have devoted resources, it could have a material negative effect on our financial position, results of operations and cash flows.

Our projects arework is conducted at offices the Company leases, as well as a variety of sites including construction sites and industrial facilities. Each location is subject to numerous health and safety risks, including electrocutions, fires, explosions, mechanical failures, exposure to hazardous materials, weather-related incidents, motor vehicle and transportation accidents and damage to equipment. In addition, we lease a sizeable fleet of vehicles operated by our employees, and many of our employees operate their personal vehicles in the course and scope of their employment, traveling to and from the sites and our facilities. These hazards can cause personal injury and loss of life, severe damage to or destruction of property and equipment and other consequential damages, and could lead to suspension of operations, large damage claims and, in extreme cases, criminal liability. While we have taken what we believe are appropriate precautions to minimize health and safety risks, we have experienced serious accidentsincidents in the past and may experience additional accidentsincidents in the future. Serious accidents may subject us to penalties, civil litigation or criminal prosecution. Claims for damages to persons, including claims for bodily injury or loss of life, could result in significant costs and liabilities, which could adversely affect our financial position, results of operations and cash flows. In addition, like other companies in our industry, we track our injury history in the form of an Experience Modification Rate (“EMR”). In the event that the EMR associated with certain of our operating units exceeds the minimum threshold set by customers, we may be unable to pursue certain projects. Poor safety performance could also jeopardize our relationships with our customers and harm our reputation.

The extent to which we utilize our workforce affects our profitability. Underutilizing our workforce could result in lower gross margins and, consequently, a decrease in our short-term profitability. On the other hand, overutilization of our workforce could negatively impact safety, employee satisfaction, attrition, and project execution, leading to a potential decline in future project awards. The utilization of our workforce is impacted by numerous factors, including:

We have separate subsidiary employers that have union and non-union operations. There is a risk that our corporate structure and operations in this regard could be challenged by one or more of the unions to which the employees belong. An adverse claim or judgment resulting from such a challenge could have a material adverse effect on our financial position, results of operations and cash flows.

We are a party to collective bargaining agreements covering a majority of our craft workforce. Although strikes, work stoppages and other labor disputes have not had a significant impact on our operations or results in the recent past, any such labor actions, or our inability to renew the collective bargaining agreements, could materially and adversely impact our financial position, results of operations and cash flows if they occur in the future.

Our continuing success depends on the performance of our management team. We rely on the experience, efforts and abilities of these individuals, each of whom would be difficult to replace. We cannot guarantee the continued employment of any of our key executives who may choose to leave the company for any number of reasons, such as other business opportunities, differing views on strategic direction, etc. If we lose members of our management team, our business, financial position, results of operations, cash flows, and customer base, as well as the market price of our common stock, could be adversely affected.

Our business is labor intensive, and many of our operations experience a high rate of employment turnover. It is often difficult to find qualified personnel in certain geographic areas where we operate. Additionally, our business is managed by a small number of key executive and operational officers. Generally, the industry is facing a shortage of trained, skilled, and qualified management, operational, and field personnel. We may be unable to hire and retain the skilled labor force necessary to operate efficiently and to support our growth strategy or to execute our work in backlog. Changes in general or local economic conditions and the resulting impact on the labor market and on our joint venture partners, subcontractors and suppliers, may make it difficult to attract or retain qualified individuals in the geographic areas where we perform our work. Our labor expenses may increase as a result of a shortage in the supply of skilled and other personnel. Labor shortages, increased labor costs or the loss of key personnel could reduce our profitability and negatively impact our business. Further, our relationship with some customers could suffer if we are unable to retain the employees with whom those customers primarily work and have established relationships.

Misconduct, fraud, non-compliance with applicable laws and regulations, or other improper activities by one or more of our employees, subcontractors, suppliers or partners could have a significant negative impact on our business and reputation. Examples of such misconduct include employee or subcontractor theft, the failure to comply with safety standards, state-specific laws related to automobile operations (including mobile phone usage), customer requirements, environmental laws, Disadvantaged Business EnterpriseEnterprises (“DBE”) regulatory compliance, and any other applicable laws or regulations. While we take precautions to prevent and detect these activities, such precautions may not be effective and are subject to inherent limitations, including human error and fraud. Our failure to comply with applicable laws or regulations or acts of misconduct could subject us to fines and penalties, harm our reputation, damage relationships with customers, reduce our revenue and profits, and subject us to criminal and civil enforcement actions.

We rely heavily on third-party subcontractors to perform some, and often a majority, of the work on many of our contracts. We also rely almost exclusively on third-party suppliers to provide the equipment and materials (including pipe, sheet metal and control systems) for our contracts. If we are unable to retain qualified subcontractors or suppliers, or if our subcontractors or suppliers do not perform as anticipated for any reason, our execution and profitability could be harmed. By contract, we remain liable to our customers for the performance or failures of our subcontractors and suppliers.

We generally do not bid on projects unless we have commitments from suppliers for the materials and equipment and from subcontractors for the services required to complete the projects at prices that have been included in the bid. Thus, to the extent that we cannot obtain commitments from our suppliers for materials and equipment, and from subcontractors for services needed, or to the extent such commitments are on terms that are adverse to the Company, our ability to bid for contracts may be impaired.impaired or we may experience reduced profit or a loss on a contract. In addition, if a supplier or subcontractor is unable to deliver materials, equipment or services according to the negotiated terms of a supply/services agreement for any reason, including the deterioration of our financial condition, we may suffer delays and be required to purchase the materials, equipment and services from another source at a higher price or incur other unanticipated costs. This may reduce the profit to be realized, or result in a loss, on a contract.

We purchase materials, including sheet metal, steel and copper piping, electrical conduit, wire and other various materials from numerous sources. We also purchase equipment from various manufacturers. The prices we pay for these materials and equipment may be impacted by transportation costs, government regulations, import duties and tariffs, changes in currency exchange rates, general economic conditions and other circumstances beyond our control. Although we may attempt to pass on certain of these increased costs to our customers, we may not be able to pass all of these cost increases on to our customers. As a result, our margins may be adversely impacted by such cost increases.

Energy prices fluctuate based on events outside of our control. We could be adversely affected by limitations on fuel supplies or increases in energy prices that result in higher transportation and equipment operation costs. Although we may be able to pass

Certain of our projects include contract clauses requiring DBE participation. The participation clauses may be in the form of a goal or in the form of a minimum amount of work that must be subcontracted to a DBE firm. If we fail to complete these projects with the minimum DBE participation, we may be held responsible for breach of contract, which may include restrictions on our ability to bid on future projects, as well as monetary damages. To the extent we are responsible for monetary damages, the total costs of the project could exceed the original estimates, we could experience reduced profits or a loss for that project, and there could be a material adverse impact to our financial position, results of operations, cash flows and liquidity. Further, if we contract with a DBE contractor that is not properly qualified to perform a commercially useful function, we could be held responsible for violation of federal, state or local laws related to DBE contracting.

As part of our business, we are a party to special purpose, project specific joint venture arrangements, pursuant to which we typically jointly bid on and execute particular projects with other companies in the construction industry. Success on these joint projects depends upon the various risks discussed elsewhere in this section and on whether our joint venture partners satisfy their contractual obligations.

We and our joint venture partners are generally jointly and severally liable for all liabilities and obligations of the joint ventures. If a joint venture partner fails to perform or is financially unable to bear its portion of required capital contributions or other obligations, including liabilities stemming from lawsuits, we could be required to make additional investments, provide additional services or pay more than our proportionate share of a liability to make up for our partner’s shortfall. Furthermore, if we are unable to adequately address our partner’s performance issues, the customer may terminate the project, which could result in legal liability to us, harm to our reputation and reduction to our profit on a project. We may be the controlling member of a joint venture; however, to the extent we are not controlling, we may have limited control over certain of the decisions made by the controlling member with respect to the work being performed by the joint venture. The other member(s) may not be subject to the same compliance and regulatory requirements. While we have processes and controls intended to mitigate risks associated with our joint ventures, to the extent the controlling member makes decisions that negatively impact the joint venture it could have a material adverse effect on our financial position, results of operations, cash flow and profits.

Certain of our projects require construction surety bonds (bid, payment, and performance bonds). Historically, surety market conditions have experienced times of difficulty as a result of significant losses incurred by surety companies stemming from macroeconomic trends outside of our control. Consequently, during times when less overall bonding capacity is available in the market, surety terms have become more expensive and more restrictive. We cannot guarantee our ability to maintain a sufficient level of bonding capacity in the future, which could preclude our ability to bid for certain contracts or successfully contract with some customers. Additionally, even if we continue to be able to access bonding capacity to sufficiently bond future work, we may be required to post collateral to secure bonds, which would decrease the liquidity we would have available for other purposes. Our surety providers are under no commitment to guarantee our access to new bonds in the future; thus, our ability to access or increase bonding capacity is at the sole discretion of our surety providers. If our surety companies were to limit or eliminate our access to bonds, the alternatives would include seeking bonding capacity from other surety companies, increasing business with clients that do not require bonds and posting other forms of collateral for project performance, such as letters of credit or cash. We may be unable to secure these alternatives in a timely manner, on acceptable terms, or at all. As such, if we were to experience an interruption or reduction in the availability of bonding capacity, it is likely we would be unable to compete for or work on certain projects.

Although we maintain insurance policies with respect to certain of our related exposures, certain of these policies are subject to high deductibles; as such, we are, in effect, self-insured for substantially all of our typical claims. Our estimates of liabilities for unpaid claims and associated expenses and the appropriateness of the estimated liability are reviewed and updated quarterly. However, insurance liabilities are difficult to assess and estimate due to the many relevant factors, the effects of which are often unknown, including the severity of an injury, the determination of our liability in proportion to other parties, the number of incidents that have occurred but are not reported, and the effectiveness of our health, safety and quality programs. Our accruals are

Additionally, in recent years, insurance markets have become more expensive and restrictive. Also, our prior casualty loss history might adversely affect our ability to procure insurance within commercially reasonable ranges. As such, we may not be able to maintain commercially reasonable levels of insurance coverage in the future, which could preclude our ability to work on many projects. Our insurance providers are under no commitment to renew our existing insurance policies in the future; therefore, our ability to obtain necessary levels or kinds of insurance coverage are subject to market forces outside our control. If we are unable to obtain necessary levels of insurance, we likely would be unable to compete for or work on most projects.

A material portion of our revenue is recognized using the cost-to-cost method of accounting, which results in recognizing contract revenue and earnings ratably over the contract term in the proportion that our actual costs bear to our estimated contract costs. The earnings or losses recognized on individual contracts are based on estimates of contract revenue, costs and profitability. We review our estimates of contract revenue, costs and profitability on an ongoing basis. Prior to contract completion, we may adjust our estimates on one or more occasions as a result of change orders to the original contract, collection disputes with the customer on amounts invoiced, or claims against the customer for increased costs incurred due to customer-induced delays and other factors. Contract losses are recognized in the fiscal period in which the loss is determined. Contract profit estimates are also adjusted in the fiscal period in which it is determined that an adjustment is required. As a result of the requirements of the cost-to-cost method of accounting, the possibility exists, for example, that we could have estimated and reported a profit on a contract over several periods and later determined, usually near contract completion, that all or a portion of such previously estimated and reported profits were overstated. If this occurs, the full aggregate amount of the overstatement will be reported for the period in which such determination is made, thereby offsetting all or a portion of any profits from other contracts that would be reported in such period, or even resulting in a loss being reported for such period. On a historical basis, in most branches,business units, we believe that we have typically made reasonably reliable estimates of the progress towards completion on our long-term contracts. However, given the uncertainties associated with these types of contracts, it is possible for actual costs to materially and adversely vary from estimates previously made, which may result in reductions or reversals of previously recorded revenue and profits.

We carry a significant amount of goodwill and identifiable intangible assets on our consolidated balance sheets. Goodwill is the excess of purchase price over the estimated fair value of the net assets of acquired businesses. We assess goodwill for impairment each year, and more frequently if circumstances suggest an impairment may have occurred. We may determine in the future that a significant impairment has occurred in the value of our unamortized intangible assets or fixed assets, which could require us to write off a portion of our assets and could adversely affect our financial condition or reported results of operations.

We often warrant the services provided, typically as a function of contract, guaranteeing the work performed against defects in workmanship and the material we supply. If warranty claims occur, we could be required to repair or replace warrantied work in place at our cost. In addition, our customers may elect to repair or replace the warrantied item by using the services of another provider and require us to pay for the cost of the repair or replacement. Costs incurred as a result of warranty claims could adversely affect our financial position, results of operations and cash flows.

The U.S. federal government has in recent years imposed new or increased tariffs or duties on an array of imported materials and goods that are used in connection with our operations. Foreign governments and trading blocs have responded by imposing or increasing tariffs, duties and/or trade restrictions on U.S. goods, and may, from time to time, consider other measures. These trade conflicts and related escalating governmental actions that result in additional tariffs, duties and/or trade restrictions could increase our operating costs, cause disruptions or shortages in our supply chains and/or negatively impact the U.S., regional or

Economic factors, including inflation and fluctuations in interest rates, recession and fears of recession could have a negative impact on our business. If our costs were to become subject to significant inflationary pressures, we may not be able to fully offset such higher costs through price increases. To the extent that Congress is unable to lower United States debt substantially or effectively increase the debt limit, a decrease in federal spending could result, which could negatively impact the ability of government agencies to fund existing or new infrastructure projects. Further, to the extent that Congress invests additional amounts in infrastructure during periods of labor shortages or supply chain disruptions, it may increase our costs or cause us not to find suitable labor, supplies, machinery or raw materials. Moreover, geopolitical risks and conflicts around the world could further disrupt supply chains and create additional inflationary pressures. For example, the recent action of Russian military forces and support personnel in the Ukraine has escalated tensions between Russia and the U.S., NATO, the EU and the U.K. The U.S. has imposed, and is likely to impose material additional, financial and economic sanctions and export controls against certain Russian organizations and/or individuals, with similar actions either implemented or planned by the EU and the U.K. and other jurisdictions. The result of these sanctions and other measures could cause the prices at which the Company buys certain raw materials to fluctuate and/or increase greatly. These pressures could also cause interest rates and the cost of our borrowing to increase. In addition, all of such actions or events could have a material adverse effect on the financial markets and economic conditions in the United States and throughout the world, which may limit our ability and the ability of our customers to obtain financing and/or could impair our ability to execute our acquisition strategy. These and related economic factors could have a material adverse effect on our financial position, results of operations, cash flows and liquidity.

Borrowings under our A&R Wintrust Credit Agreement (as defined below) are at variable rates of interest and expose us to interest rate risk. If interest rates increase, our debt service obligations on the variable rate indebtedness will increase even though any amount borrowed remains the same, and our net income and cash flows, including cash available for servicing our

indebtedness, will correspondingly decrease. As of the December 31, 2021,2022, we had $25.0$21.8 million of available borrowing capacity (with zero drawn) under the A&R Wintrust Revolving Loan (as defined below) and $35.0$21.5 million outstanding under the A&R Wintrust Term Loan (as defined below). In addition, we may determine to enterhave entered into an interest rate swapsswap on our A&R Wintrust Term Loan that involveinvolves the exchange of variable for fixed rate interest payments in order to reduce interest rate volatility. However, we may not maintain interest rate swaps with respect to all of our variable rate indebtedness, and any swaps we enter into may not fully mitigate our interest rate risk and could be subject to credit risk themselves.

Our A&R Wintrust Credit Agreement and other debt obligations include certain debt covenants, some of which are financial in nature, are further described in “Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations” of this Annual Report on Form 10-K. Our failure to comply with any of these covenants, or to pay principal, interest or other amounts when due thereunder, would constitute an event of default under the applicable agreements. Under certain circumstances, the occurrence of an event of default under one of these agreements (or the acceleration of the maturity of the indebtedness under one of these agreements) may constitute an event of default under one or more of our other debt or surety agreements. Default under our debt agreements could result in, among other things, us no longer being entitled to borrow under one or more of the agreements, acceleration of the maturity of outstanding indebtedness under the agreements, and/or foreclosure on any collateral securing the obligations under the agreements. If we are unable to service our debt obligations, or if we are unable to comply with our financial or other debt covenants, and our indebtedness would become immediately due and payable, and we could be forced to curtail our operations, reorganize our capital structure (including through bankruptcy proceedings), or liquidate some or all of our assets in a manner that could cause holders of our securities to experience a partial or total loss of their investment.

Our ability to meet all of our existing or potential future debt service obligations (including those under our A&R Wintrust Credit Agreement, pursuant to which we may incur significant indebtedness), to refinance our existing or potential future indebtedness, and to fund our operations, working capital, acquisitions, capital expenditures, and other important business uses,

We cannot assure that our business will generate sufficient cash flow from operations or that future sources of cash will be available to us on favorable terms, or at all, in amounts sufficient to enable us to meet all of our existing or potential future debt service obligations, or to fund our other important business uses or liquidity needs. Furthermore, if we incur additional indebtedness in connection with future acquisitions or for any other purpose, our existing or potential future debt service obligations could increase significantly and our ability to meet those obligations could depend, in large part, on the returns from such acquisitions or projects, as to which no assurance can be given.

Furthermore, our obligations under the terms of our borrowings could impact us negatively. For example, such obligations could:

We may also refinance all or a portion of our indebtedness at or prior to the scheduled maturity. Our ability to refinance our indebtedness or obtain additional financing will depend on, among other things, (i) our business, financial condition, liquidity, results of operations, and then-current market conditions; and (ii) restrictions in the agreements governing our indebtedness. As a result, we may not be able to refinance any of our indebtedness or obtain additional financing on favorable terms, or at all.

If we do not generate sufficient cash flow from operations and additional borrowings or refinancings are not available to us, we may be unable to meet all of our existing or potential future debt service obligations. As a result, we would be forced to take other actions to meet those obligations, such as raising equity or delaying capital expenditures, any of which could have a

material adverse effect on us. Furthermore, we cannot assure that we will be able to effect any of these actions on favorable terms, or at all.

We contribute to approximately 40 multiemployer pension plans in the United States under collective bargaining agreements that generally provide pension benefits to employees covered by these agreements. Approximately 51%54% of our current employees are members of collective bargaining units. Our contributions to these plans were approximately $12.6 million for the year ended December 31, 2022 and $14.3 million for the year ended December 31, 2021 and $16.1 million for the year ended December 31, 2020.2021. The costs of providing benefits through such plans have increased in recent years. The amount of any increase or decrease in our required contributions to these multiemployer pension plans will depend upon many factors, including the outcome of collective bargaining, actions taken by trustees who manage the plans, government regulations, the actual return on assets held in the plans and the potential payment of a withdrawal liability. Based upon the information available to us from the multiemployer pension plans’ administrators, we believe that some of these multiemployer pension plans are underfunded. The unfunded liabilities of these plans may result in required increased future payments by us and the other participating employers. Underfunded multiemployer pension plans may impose a surcharge requiring additional pension contributions. Our risk of such increased payments may be greater if any of the participating employers in these underfunded plans withdraws from the plan and is not able to contribute an amount sufficient to fund the unfunded liabilities associated with its participants in the plan.

With limited exception, an employer who is obligated under a collective bargaining agreement to contribute to a multiemployer pension plan is liable, upon termination of such contribution obligation to the plan or withdrawal from a plan, for its proportionate share of the plan’s unfunded vested pension liabilities. In the event that we withdraw from participation in a plan, applicable law could require us to make withdrawal liability contributions to such plan, and we would have to reflect that liability and the related expense in our consolidated financial statements. Our withdrawal liability payable to an individual multiemployer pension plan would depend on the extent of the plan’s funding of vested benefits. While we currently have no intention of withdrawing from a plan, and underfunded plan obligations have not affected our operations in the past, there can be no assurance that we will not be required to make material cash contributions to one or more of these plans in the future. If

If a pandemic, epidemic, or outbreak of an infectious disease, including the outbreak of any respiratory illness caused by COVID-19, or other public health crisis were to affect our markets or facilities or those of our suppliers, or customers, our business could be adversely affected. Consequences of a pandemic, epidemic or other infectious disease may include disruptions in or restrictions on our ability to travel. If such an infectious disease broke out at one or more of our offices, facilities or work sites, our operations may be adversely and materially affected, our productivity may be affected, our ability to

complete projects in accordance with our contractual obligations may be affected, and we may incur increased labor and materials costs. If the customers with which we contract are affected by an outbreak of infectious disease, GCR and ODR work may be delayed or cancelled, and we may incur increased labor and materials costs. If our subcontractors with whom we work were affected by an outbreak of infectious disease, our labor supply may be affected and we may incur increased labor costs. In addition, we may experience difficulties with certain suppliers or with vendors in their supply chains, and our business could be affected if we become unable to procure essential equipment, supplies or services in adequate quantities and at acceptable prices. Further, infectious outbreaks have and could in the future cause disruption to the U.S. economy, or the local economies of the markets in which we operate, and may cause shortages of building materials, increaseincreased costs associated with obtaining building materials, affect job growth and consumer confidence, or cause economic changes, including the possibility of an economic recession or inflation, that we cannot anticipate. Overall, the potential impact of a pandemic, epidemic or outbreak of an infectious disease with respect to our markets or our facilities is difficult to predict and could adversely impact our business.

On September 9, 2021, President Biden issued an executive orderIt is possible that resulted in guidance for all employers with U.S. Government contracts to ensure that their U.S.-based employees, contractors, and subcontractors, that workgovernment authorities or private companies may impose vaccine mandates, employee testing or other similar requirements on or in support of, U.S. Government contracts, were fully vaccinated by January 4, 2022. The executive order included on-site and remote U.S.-based employees, contractors and subcontractors and it only permitted limited exceptions for disability/medical and religious reasons. The executive order has been challenged in court and has been stayed, at least temporarily, by certain federal courts.

Greenhouse gas (“GHG”) emissions are driving global climate change that is expected to have various impacts on our operations, ranging from more frequent extreme weather events to extensive governmental policy developments and shifts in our customers’ preferences, which have the potential individually or collectively to significantly disrupt our business as well as negatively affect our suppliers, independent contractors and customers. Experiencing or addressing the various physical, regulatory and adaptation/transition risks from climate change may significantly reduce our revenue and profitability, or cause us to generate losses. For instance, incorporating greater resource efficiency into our solutions, whether to comply with upgraded building codes or recommended practices given a region’s particular exposure to climate conditions, or undertaken to satisfy demand from increasingly environmentally conscious customers or to meet our own sustainability goals, often raises our costs. In evaluating whether to implement voluntary improvements, we also consider that choosing not to enhance our buildings’ resource efficiency can make them less attractive to municipalities, and increase the vulnerability of customers in our communities to rising energy and water expenses and use restrictions. We weigh the impact of the costs associated with offering more resource-efficient products against our priorities of generating higher returns and delivering solutions that are affordable to our customers. In balancing these objectives, we may determine we need to absorb most or all of the additional operating costs that come with making our solutions more efficient, which may be substantial for us.

Beyond the commercial pressures implicated by climate change concerns, our operations in any of our served markets may face its potential adverse physical effects. For example, California has historically experienced, and is projected to continue to experience, climate-related events at an increasing frequency including drought, water scarcity, heat waves, wildfires and resultant air quality impacts and power shutoffs associated with wildfire prevention. While we have safety protocols in place for our construction sites and take steps to safeguard our administrative functions, we can provide no assurance that we or our suppliers or other partners can successfully operate in areas experiencing a significant weather event or natural disaster, and we or they may be more impacted and take longer, and with higher costs, to resume operations in an affected location than other businesses, depending on the nature of the event or other circumstances.

International, federal, state and local authorities and legislative bodies have issued, implemented or proposed regulations, penalties, standards or guidance intended to restrict, moderate or promote activities consistent with resource conservation, GHG emission reduction, environmental protection or other climate-related objectives. Compliance with those directed at or otherwise affecting our business or our suppliers’ (or their suppliers’) operations, products or services, could increase our costs or delay or complicate our solutions, for example, due to a need to reformulate or redesign building materials or components, or source updated or upgraded items or equipment, or specially trained or certified independent contractors, in limited or restricted supply.

Adapting to or transitioning from the use of certain items or methods in construction or other solutions, or adjusting the products we offer to our customers, whether due to climate-related governmental rules or our supply chain, market dynamics or consumer preferences, can negatively affect our costs and profitability, production operations in affected markets and customer satisfaction during the transition period, which could be prolonged.

Climate change is an intrinsically complex global phenomenon with inherent residual risks across its physical, regulatory and adaptation/transition dimensions that cannot be mitigated given their wide-ranging, (sometimes unexpectedly) interdependent and largely unpredictable potential scope, nature, timing or duration. Therefore, we cannot provide any assurance that we have or can successfully prepare for, or are or will be able to reduce or manage, any of them to the extent they may arise. In addition, we may experience substantial negative impacts to our business if an unexpectedly severe weather event or natural disaster damages our operations or those of our suppliers or independent contractors in our primary markets or from the unintended consequences of regulatory changes that directly or indirectly impose substantial restrictions on our activities or adaptation requirements.

Our business may be adversely affected by severe weather in areas where we have significant operations. Repercussions of severe weather conditions may include:

We use sophisticated information technology systems, networks, and infrastructure in conducting some of our day-to-day operations and providing services to certain customers, including technology used for building designs, project modeling and scheduling. Information technology system failures, including suppliers’ or vendors’ system failures, could disrupt our operations by causing transaction errors, processing inefficiencies, the loss of customers, other business disruptions, or the loss of employee personal information. In addition, these systems, networks, and infrastructure may be vulnerable to deliberate cyber-attacks that interfere with their functionality or the confidentiality of our data or information or our customers’ data or information. Increasingly advanced cyber-attacks against rapidly evolving computer technologies pose a risk to the security of our systems, networks, information and data. Likewise, cyber incidents, including malicious cyber-attacks perpetrated on our employees and cyber incidents caused by third parties surreptitiously accessing our systems by other means, pose a risk to the security of the systems, networks, information and data of ours, our customers, subcontractors and suppliers. Despite efforts to protect confidential business information, personal data of ours, our customers, employees, suppliers and subcontractors, our information technology systems and those of our third-party service providers may be subject to system breaches. System breaches can lead to disclosure, modification and destruction of proprietary business data, personally identifiable information, other sensitive information, production downtime or loss of business, and damage to our reputation, competitiveness and operations. Of special note is our risk when implementing new capabilities. As we implement new systems, many times both new and old systems run in parallel until all processes have successfully transferred to the new system and thorough testing has been performed. These events could impact our customers, suppliers, subcontractors, employees, our financial reporting and our reputation and lead to financial losses from remediation actions, loss of business or potential liability, or an increase in expense, all of which may have a material adverse effect on our business.

As of December 31, 2021,2022, our branch locationsbusiness units operate in 21 states, which exposes us to a variety of state and local laws and regulations, particularly those pertaining to contractor licensing requirements. These laws and regulations govern many aspects of our business, and there are often different standards and requirements in different locations. In addition, our subsidiaries that perform work for federal government entities are subject to additional federal laws and regulatory and contractual requirements. Changes in any of these laws, or any subsidiary’s material failure to comply with them, can adversely impact our operations by, among other things, increasing costs, distracting management’s time and attention from other items, and harming our reputation.

Federal Government Contractors must comply with many regulations and other requirements that relate to the award, administration and performance of government contracts. A violation of these laws and regulations could result in imposition of fines and penalties, the termination of a government contract, or debarment from bidding on government contracts in the future. Further, despite our decentralized nature, a violation at one of our locations could impact the ability of the other locations to bid on and perform government contracts; additionally, because of our decentralized nature, we face risk in maintaining compliance with all local, state and federal government contracting requirements. Prohibition against bidding on future government contracts could have an adverse effect on our financial position, results of operations and cash flows.

HVACThe systems we install are subject to various environmental statutes and regulations, including the Clean Air Act and those regulating the production, servicing and disposal of certain ozone-depleting refrigerants used in HVAC systems.regulations. There can be no assurance that the regulatory environment in which we operate will not change significantly in the future. Various local, state and federal laws and regulations impose licensing standards on technicians who install and service HVAC systems. And additional laws, regulations and standards apply to contractors who perform work that is being funded by public money, particularly federal public funding. Our failure to comply with these laws and regulations could subject us to substantial fines, the loss of licenses or potential debarment from future publicly funded work. It is impossible to predict the full nature and effect of judicial, legislative or regulatory developments relating to health and safety regulations and environmental protection regulations applicable to our operations.

In certain markets, we rely heavily on our immigrant labor force. We have taken steps that we believe are sufficient and appropriate to ensure compliance with immigration laws. However, we cannot provide assurance that our management has identified, or will identify in the future, all illegalundocumented immigrants who work for us. The failure to identify such illegal immigrants may result in fines or other penalties being imposed upon us, which could have a material adverse effect on our financial position, results of operations and cash flows.

Risks Related to Ownership of Our Common Stock

The market price of our common stock has been volatile and may be volatile in the future, and could be subject to wide fluctuations in price in response to various factors, some of which are beyond our control. These factors include, among other things:

In addition, if the market for stocks in our industry, or the stock market in general, experiences a loss of investor confidence, the trading price of our common stock could decline for reasons unrelated to our business, financial condition or results of operations. If any of the foregoing occurs, it could cause our stock price to fall and may expose us to lawsuits that, even if unsuccessful, could be costly to defend and a distraction to management.

Any transfer or sales of substantial amounts of our common stock in the public market or the perception that such transfer or sales might occur may cause the market price of our common stock to decline. As of March 15, 2022,7, 2023, we had an aggregate of 10,423,06810,449,689 shares of our outstanding common stock, of which 1,205,1871,351,803 shares were held by our current directors and officers. There were no holders of greater than 10% of our common stock.stock as of March 7, 2023. If a substantial number of these shares are sold in the public market, the trading price of our common stock may decline.

In addition, our board has the power, without stockholder approval, to set the terms of any series of preferred stock that may be issued, including voting rights, dividend rights, and preferences over our common stock with respect to dividends or in the event of a dissolution, liquidation or winding up and other terms. In the event that we issue preferred stock in the future that has preference over our common stock with respect to payment of dividends or upon our liquidation, dissolution or winding up, or

We are generally not restricted from issuing additional shares of our common stock, up to the 100,000,000 shares of voting common stock authorized by our second amended and restated certificate of incorporation, which could be increased by a vote of the holders of a majority of our shares. In addition, we may issue additional shares of our common stock in the future pursuant to current or future equity compensation plans, upon conversions of preferred stock or debt, upon exercise of warrants or in connection with future acquisitions or financings. If we choose to raise capital by selling shares of our common stock for any reason, the issuance would have a dilutive effect on the holders of our common stock and could have a material negative effect on the market price of our common stock.

The trading market for our common stock could be affected by equity research analysts’ research or reports about us and our business. The price of our stock could decline if one or more securities analysts downgrade our stock or if analysts issue other unfavorable commentary about us or our business. In addition, if any of these analysts ceases coverage of us, we could lose visibility in the market, which in turn could cause our common stock price or trading volume to decline and our common stock to be less liquid.

The payment of cash dividends on our common stock rests within the discretion of our Board of Directors and will depend, among other things, upon our earnings, unencumbered cash, capital requirement and our financial condition, as well as other relevant factors. To date, we have not paid dividends on our common stock nor do we anticipate that we will pay dividends in the foreseeable future. As of December 31, 2021,2022, we do not have any preferred stock outstanding that has any preferential dividends.

The provisions of our Certificate of Incorporation and outour bylaws could have the effect of delaying, deferring or discouraging another person from acquiring control of our company. These provisions, which are summarized below, may have the effect of discouraging takeover bids. They are also designed in part to encourage persons seeking to acquire control of us to negotiate first with our Board of Directors. We believe that the benefits of increased protection of our potential ability to negotiate with an unfriendly or unsolicited acquirer outweigh the disadvantages of discouraging a proposal to acquire us because negotiation of these proposals could result in an improvement of their terms.

Our Certificate of Incorporation and our bylaws include a number of provisions that could deter hostile takeovers or delay or prevent changes in control of our company, including the following:

We previously issued warrants that were initially issued to 1347 Investors LLC, our sponsor (the “Sponsor”) in a private placement concurrently with the closing of our initial public offering and are exercisable for one share of common stock at an exercise price of $15.00 per share (the “$15 Exercise Price Warrants”).

The $15 Exercise Price Warrants were issued in registered from under the Warrant Agreement dated July 15, 2014, between Continental Stock Transfer & Trust Company, as warrant agent, and us. The Warrant Agreement provides that the terms of such $15 Exercise Price Warrants may be amended without the consent of any holder to cure any ambiguity, cure, correct or supplement any defective provision, or add, or change any other provision with respect to matters or questions arising under the Warrant Agreement that the parties deem necessary or desirable, but requires the approval by the holders of at least a majority of the then outstanding $15 Exercise Price Warrants, voting together as a single class, to make any change that adversely affects the interests of the registered holders. Accordingly, we may amend the terms of such $15 Exercise Price Warrants in a manner adverse to a holder if holders of at least a majority of the then outstanding $15 Exercise Price Warrants approve of such amendment. Although our ability to amend the terms of such $15 Exercise Price Warrants with the consent of at least a majority of the then outstanding $15 Exercise Price Warrants is unlimited, examples of such amendments could be amendments to among other things, increase the exercise price of such $15 Exercise Price Warrants, convert such $15 Exercise Price Warrants

The $15 Exercise Price Warrants are not redeemable by us so long as they are held by their initial purchasers or their permitted transferees. However, if the $15 Exercise Price Warrants are sold to you and you are not a permitted transferee under the terms of the $15 Exercise Price Warrants, we will have the ability to redeem such outstanding warrants at any time prior to their expiration, at a price of $0.01 per warrant, provided that the last reported sales price of common stock equals or exceeds $24.00 per share for any 20 trading days within a 30-trading day period ending on the third trading day prior to the date we give notice of redemption. If and when such $15 Exercise Price Warrants become redeemable by us, we may exercise our redemption right

even if we are unable to register or qualify the underlying securities for sale under all applicable state securities laws. Redemption of such outstanding $15 Exercise Price Warrants could force you (i) to exercise your warrants and pay the exercise price thereof at a time when it may be disadvantageous for you to do so, (ii) to sell your warrants at the then current market price when you might otherwise wish to hold your warrants of (iii) to accept the nominal redemption price which, at the time the outstanding $15 Exercise Price Warrants are called for redemption, is likely to be substantially less than the market value of your warrants.

We plan to continue to maintain and strengthen internal controls and procedures to enhance the effectiveness of our disclosure controls and internal controls over financial reporting. Any system of controls, however well designed and operated, is based in part on certain assumptions and can provide only reasonable, and not absolute, assurances that the objectives of the system are met. Any failure of our disclosure controls and procedures or internal controls over financial reporting could harm our financial condition and results of operations.

A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting such that there is a reasonable possibility that a material misstatement of the annual or interim financial statements will not be prevented or detected on a timely basis. However, if we were unable to maintain effective internal control over financial reporting, or if we identify additional material weaknesses in our internal control over financial reporting, our management would be unable to assert in future reports that our disclosure controls and procedures and our internal control over financial reporting are effective. This could cause investors, counterparties and customers to lose confidence in the accuracy and completeness of our financial statements and reports and have a material adverse effect on our liquidity, access to capital markets and perceptions of our creditworthiness and/or a decline in the market price of our common stock. In addition, we could become subject to investigations by Nasdaq, the SEC or other regulatory authorities, which could require additional financial and management resources. These events could have a material adverse effect on our business, financial condition and results of operations.

We have been and will continue to be named as a defendant in legal proceedings claiming damages in connection with the operation of our business. These actions and proceedings may involve claims for, among other things, compensation for alleged personal injury, workers’ compensation, employment law violations and/or discrimination, breach of contract, or property damage. In addition, we may be subject to lawsuits involving allegations of violations of the Fair Labor Standards Act and state wage and hour laws. We may also face allegations of violations of applicable securities laws, including the possibility of class action lawsuits. Due to the inherent uncertainties of litigation, we cannot accurately predict the ultimate outcome of any such actions or proceedings. We also are, and will likely continue to be from time to time, a plaintiff in legal proceedings against customers, or will pursue claims against our customers prior to litigation in which we seek to recover payment of contractual amounts we are owed, as well as claims for increased costs we incur. When appropriate, we will establish provisions against possible exposures, and adjust these provisions from time to time according to ongoing exposure. If the assumptions and estimates related to these exposures prove to be inadequate or inaccurate, we could experience a reduction in our profitability

Force majeure, or extraordinary events beyond the control of the contracting parties, such as natural and man-made disasters, terrorist actions, and state and federal government shutdowns, could negatively impact us. We attempt to negotiate contract language seeking to mitigate force majeure events in both public and private client contracts. When successful, we remain obligated to perform our services after most extraordinary events subject to relief that may be available pursuant to a force majeure clause. If we are not able to react quickly to force majeure events, our operations may be affected significantly, which wouldmay have a negative impact on our financial position, results of operations and cash flows.

Intentional acts of theft, vandalism and destruction could damage or destroy our facilities, as well as the materials and equipment our labor forces are installing, thereby reducing our operational production capacity and requiring us to repair or replace facilities or installed work at substantial cost. Additionally, employees, contractors and the public could suffer substantial physical injury from acts of terrorism for which we could be liable. Governmental authorities may also impose security or other requirements that could make our operations more difficult or costly. The consequences of any such actions could adversely affect our financial position, results of operations and cash flows.

We continue to assess the impact of various U.S. federal or state legislative proposals that could result in a material increase to our U.S. federal or state taxes. We cannot predict whether any specific legislation will be enacted or the terms of any such legislation. However, if such proposals were to be enacted, or if modifications were to be made to certain existing regulations, the consequences could have a material adverse impact on us, including increasing our tax burden, increasing the cost of tax compliance or otherwise adversely affecting our financial position, results of operations and cash flows.

Not applicable.

Information About Our Executive Officers

The following discussion should be read in conjunction with the consolidated financial statements and related notes thereto included elsewhere in this Annual Report on Form 10-K. In addition to historical information, this discussion contains forward-looking statements that involve risks, uncertainties and assumptions that could cause actual results to differ materially from our management’s expectations. Factors that could cause such differences are discussed in “Forward-Looking Statements”, “Risk Factor Summary” and “Risk Factors” in this Annual Report. We assume no obligation to update any of these forward-looking statements.

Overview

The Company is an integrated building systems solutions firm whose expertise is in the design, modular prefabrication, installation, management and maintenance of HVAC, mechanical, electrical, plumbing and control systems for commercial, institutional and light industrial markets. The Company operates primarily in the Northeast, Mid-Atlantic, Southeast Midwest, and SouthwesternMidwest regions of the United States.

The Company operates in two segments, which were renamed as of January 1, 2021 to reflect the Company's two distinct approaches to its customer base and to better align with its owner direct strategy. The previously named Construction segment is now known as GCR; the previously named Service segment is now known as ODR. The Company's operating segments are based on the relationship with its customers, (i) GCR, in which the Company generally manages new construction or renovation projects that involve primarily HVAC, plumbing, or electrical services awarded to the Company by general contractors or construction managers, and (ii) ODR, in which the Company performs owner direct projects and/or provides maintenance or service primarily on HVAC, plumbing or electrical systems, building controls and specialty contracting projects direct to, or assigned by, building owners or property managers. This work is primarily performed under fixed price, modified fixed price, and time and material contracts over periods of typically less than two years.

Key Components of Consolidated Statements of Operations

The Company generates revenue principally from fixed-price construction contracts to deliver HVAC, plumbing, and electrical construction services to its customers. The duration of the Company’s contracts generally ranges from sixthree months to two years. Revenue from fixed price contracts is recognized on the cost-to-cost method, measured by the relationship of total cost incurred to total estimated contract costs. Revenue from time and materials service contracts is recognized as services are performed. The Company believes that its extensive experience in HVAC, plumbing, and electrical projects, and its internal cost review procedures during the bidding process, enable it to reasonably estimate costs and mitigate the risk of cost overruns on fixed price contracts.

The Company generally invoices customers on a monthly basis based on a schedule of values that breaks down the contract amount into discrete billing items. Costs and estimated earnings in excess of billings are recorded as a contract asset until billable under the contract terms. Billings in excess of costs and estimated earnings are recorded as a contract liability until the related revenue is recognizable.

Cost of revenue primarily consists of the labor, equipment, material, subcontract, and other job costs in connection with fulfilling the terms of our contracts. Labor costs consist of wages plus taxes, fringe benefits, and insurance. Equipment costs consist of the ownership and operating costs of company-owned assets, in addition to outside-rented equipment. If applicable, job costs include estimated contract losses to be incurred in future periods. Due to the varied nature of the Company’s services, and the risks associated therewith, contract costs as a percentage of contract revenue have historically fluctuated and it expects this fluctuation to continue in future periods.

Selling, general and administrative (“SG&A”) expenses consist primarily of personnel costs for its administrative, estimating, human resources, safety, information technology, legal, finance and accounting employees and executives. Also included are

non-personnel costs, such as travel-related expenses, legal and other professional fees and other corporate expenses to support the growth of the Company’s business and to meet the compliance requirements associated with operating as a public company. Those costs include accounting, human resources, information technology, legal personnel, additional consulting, legal and

Amortization expense represents periodic non-cash charges that consist of amortization of various intangible assets primarily including favorable leasehold interests and certain customer relationships in the ODR segment. As a result of the Jake Marshall Transaction, the Company recognized, in the aggregate, an additional $5.7 million of intangible assets associated with customer relationships with third-party customers, the acquired trade name and acquired backlog. The Jake Marshall-related intangible assets were recorded under the acquisition method of accounting at their estimated fair values at the acquisition date. See Note 3 – Acquisitions in the accompanying notes to the Company’s consolidated financial statements for further discussion of the Company’s acquired intangible assets as a result of the Jake Marshall Transaction.

The Company is taxed as a C Corporationcorporation and its financial results include the effects of federal income taxes which will be paid at the parent level.

Operating Segments

The Company manages and measures the performance of its business in two operating segments: GCR and ODR. These segments are reflective of how the Company’s Chief Operating Decision Maker (“CODM”) reviews operating results for the purposes of allocating resources and assessing performance. The Company’s CODM is comprised of its President and Chief Executive Officer, Executive Vice President and Chief Financial Officer and Executive Vice President and Chief Operating Officer.

Note 1112 – Operating Segments in the accompanying notes to the Company’s consolidated financial statements for further discussion on its operating segments.

The following table presents operating results for the years ended December 31, 20212022 and 20202021 in dollars and expressed as a percentage of total revenue (except as indicated below):

Revenue for the year ended December 31, 2021 decreased2022 increased by $77.9$6.4 million compared to the year ended December 31, 2020.2021. GCR revenue decreased by $91.0$69.6 million, or 20.6%19.9%, while ODR revenue increased by $13.1$76.1 million, or 10.3%54.2%. The decrease in

Gross Profit

The Company's gross profit for the year ended December 31, 20212022 increased by $4.5$7.8 million, or 5.6%9.1% compared to the year ended December 31, 2020.2021. GCR gross profit increased $0.3decreased $6.8 million, or 0.7%14.9%, largely due to lower revenue at slightly higher margins despite lower revenue.margins. ODR gross profit increased $4.2$14.6 million, or 11.7%36.1%, due to an increase in revenue at slightly higher margins.despite lower margins driven by project mix and timing. The total gross profit percentage increased from 14.3%17.5% for the year ended December 31, 20202021 to 17.5% for the18.9% for the year ended December 31, 2021,2022, mainly driven by the mix of higher margin ODR segment work, coupled with improved GCR segment margins. Froma gross profit write-up of $1.3 million related to a settlement of a prior claim. In addition, for the Effective Date throughyear ended December 31, 2021,2022, gross profit generated by the Acquired Entities in the Jake Marshall Transaction generatedincreased by approximately $0.4$9.7 million in gross profit, which was mostly attributablecompared to the ODR segment.year ended December 31, 2021.

The following table summarizes the Company’sCompany recorded revisions in its contract estimates for certain GCR and ODR projects forprojects. During the yearsyear ended December 31, 2021 and 2020 (includes2022, the Company recorded material gross profit changeswrite-ups on three GCR projects for a total of $0.25$3.0 million and four material GCR project gross profit write-downs for a total of $2.8 million that had a net gross profit impact of $0.5 million or more).

The Company's SG&A expense for the year ended December 31, 20212022 increased by approximately $7.8$6.4 million, or 12.3%9.0% compared to the year ended December 31, 2020.2021. The increase in SG&A was primarily attributabledue to a $1.5 million in non-cash stock-based compensation expense, a $1.5$5.9 million increase in professional fees, which includedassociated with costs associated withincurred by the Acquired Entities in the Jake Marshall Transaction, $2.2 million associated with an estimated loss contingency accrual and compliance requirements, a $1.5$1.0 million increase in travel and entertainment expense. These increases were partially offset by a decrease of $0.5 million associated with professional fee expenses, and a $1.2 million increase in rent expense. Travel and entertainment expenses during the year ended December 31, 2021 were higher than the year ended December 31, 2020 duecoupled with other various immaterial decreases to temporary, pandemic-driven operational reductions in 2020 andSG&A, which reflect the Company’s continued investmentongoing efforts to reduce operating expenses where possible. The Company has also made strategic investments, which are reflected in the SG&A of its ODR expansion in 2021.segment, consisting primarily of salespeople and support staff to aid the Company’s focus on the accelerated growth of its ODR segment. Additionally, SG&A as a percentage of revenue was 15.7% for the year ended December 31, 2022 and 14.6% for the year ended December 31, 2021 and 11.2%2021.

The change in fair value of the Earnout Payments contingent consideration was a $2.3 million loss for the year ended December 31, 2020. SG&A2022. The increase to the contingent liability was primarily attributable to the timing component and probability of meeting the gross profit margins associated with the Acquired Entities in the Jake Marshall Transaction from the Effective Date throughcontingent consideration arrangement as of December 31, 2021 was approximately $0.5 million.2022.

Total amortization expense for the year ended December 31, 2021 decreased2022 increased by approximately $0.1$1.1 million compared to the year ended December 31, 2020.2021. As a result of the Jake Marshall Transaction, the Company acquired certain intangible assets in which the Company recognized approximately $0.1$1.4 million of amortization expense for the period fromyear ended December 31, 2022 compared to $0.1 million for the Effective Date throughyear ended December 31, 2021. See Note 3 – Acquisitions in the accompanying notes to the Company’s consolidated financial statements for further discussion of the Company’s acquired intangible assets as a result of the Jake Marshall Transaction.

Other (expenses) income consisted of interest expense of $2.1 million for the year ended December 31, 2022 as compared to $2.6 million for the year ended December 31, 2021 as compared to $8.6 million for the year ended December 31, 2020.2021. The reduction in interest expense period over period was due to the refinancing of the higher interest rate debt with a lower interest rate debt instrument as a result of the 2021 Refinancing and the A&R Wintrust Agreement.Agreement, coupled with a lower overall level of outstanding debt during 2022. The decrease in other expenses period over periodyear-over-year was also attributable to a prior year loss of $1.6 million associated with the change in fair value of the CB Warrants (defined in Note 7 - Debt in the accompanying notes to the

The Company’s income tax provision was $2.8 million and $1.2 million for theboth years ended December 31, 2022 and 2021, and 2020, respectively. The increase in income tax expense was primarily attributable to higher pre-tax income. The Companyit had a 29.2% and 17.0% effective tax rate for the years ended December 31, 2021 and 2020, respectively.over those same periods. The increase in theCompany’s effective tax rate was primarily attributable to the prior year enacted Coronavirus Aid, Relief,changes based upon its relative profitability, or lack thereof, in states with varying tax rates and Economic Security Act (“CARES Act”) net operating loss (“NOL”) carryback provision, which allows NOLs incurred in 2018, 2019rules. In addition, discrete items, such as tax law changes, judgments and 2020 to be carried back to each of the five preceding taxable years to generate a refund of previously paid income taxes. This allowed the Company to carryback net operating losses generated in 2018 and 2019 to priorlegal structures can impact its effective tax years and generate a tax refund. The total refund generated by this carryback for the year ended December 31, 2020 was $1.6 million, of which all has been received.

GCR and ODR Backlog Information

The Company’s GCR backlog was $337.2$302.9 million and $393.5$337.2 million as of December 31, 20212022 and 2020,2021, respectively. Projects are brought into backlog once the Company has been provided a written confirmation of award and the contract value has been established. At any point in time, the Company has a substantial volume of projects that are specifically identified and advanced in negotiations and/or documentation, however those projects are not booked as backlog until the Company has received written confirmation from the owner or the GC/CM of their intention to award it the contract and they have directed the Company to begin engineering, designing, incurring construction labor costs or procuring needed equipment and material. The Company’s GCR projects tend to be built over a 12- to 24-month schedule depending upon scope and complexity. Most major projects have a preconstruction planning phase which may require months of planning before actual construction commences. The Company is occasionally employed to deliver a “fast-track” project, where construction commences as the preconstruction planning work continues. As work on the Company’s projects progress, it increases or decreases backlog to take into account its estimate of the effects of changes in estimated quantities, changes in conditions, change orders and other variations from initially

anticipated contract revenue, and the percentage of completion of the Company’s work on the projects. Based on historical trends, the Company currently estimates that 65%68% of its GCR backlog as of December 31, 20212022 will be recognized as revenue during 2022.2023. Additionally, the reduction in GCR backlog has been intentional as the Company looks to focus on higher margin projects than historically, as well as its focus on smaller, higher margin owner direct projects. As of December 31, 2021, GCR backlog included approximately $33.8 million of backlog associated with the operations of the entities acquired in the Jake Marshall Transaction.

The Company’s ODR backlog was $98.0$108.2 million and $50.9$98.0 million as of December 31, 20212022 and 2020,2021, respectively. These amounts reflect unrecognized revenue expected to be recognized over the remaining terms of our service contracts and projects. Based on historical trends, the Company currently estimates that 69%92% of its ODR backlog as of December 31, 20212022 will be recognized as revenue during 2022.2023. The Company believes its ODR backlog increased due to its continued focus on the accelerated growth of its ODR growth, as well as lower sales in this segment during the fourth quarter of Fiscal 2020 because of macroeconomic uncertainty related to COVID-19. In addition, as of December 31, 2021, ODR backlog included approximately $22.6 million of backlog associated with the operations of the entities acquired in the Jake Marshall Transaction.business.

Impact of COVID-19 and Market Update

In March 2020, the World Health Organization declared COVID-19the outbreak of the coronavirus disease 2019 (“COVID-19”) a global pandemic. The COVID-19 pandemic has caused significant disruption and volatility on a global scale resulting in, among other things, an economic slowdown, impacts to global supply chains, and the possibility of a continued economic recession. In limited instances, during fiscal 2020, the Company faced disruptions due to the COVID-19 pandemic as certain projects chose to shutdown work irrespective of the

As new variants of the virus emerge, the Company remains cautious as many factors remain unpredictable. The Company actively monitors and responds to the changing conditions created by the pandemic, with focus on prioritizing the health and safety of the Company’s employees, dedicating resources to support the Company’s communities, and innovating to address the Company’s customers’ needs. During 2021, the Company faced impacts of both the Delta and Omicron variants, with disruptions to the Company’s workforce, which impacted revenue.

Supply chain disruptions, material shortages and escalating commodity prices as a result of COVID-19 are expected to continue into 2022. During the fourth quarter of 2021,Although the Company was impacted by supply chain issues delaying equipment delivery, which resulted in revenue being pushedcontinues to future periods. The impactrecover from the financial impacts of the COVID-19 pandemic and related government orders implemented to mitigate it, the broader and longer-term implications the pandemic has on the Company’s vendorsglobal economy continue to develop. Economic disruptions, including supply chain, production, and other logistical issues, as well as escalating commodity prices, have and may continue to negatively impact our business. For example, we are experiencing lead times significantly in excess of normal levels while also experiencing the effects of inflation through increases in fuel, material, and other commodity prices. These disruptions have escalated in 2022 and have manifested themselves most notably through project delays and reduced labor productivity and efficiency, particularly within our GCR segment. In response to these challenges, the Company continues to strive to more effectively manage its business through enhanced labor planning and project scheduling, increased pricing to the extent contractually permitted, and availabilityby leveraging the Company's relationships with its suppliers and customers. However, the impact of materials or supplies utilized in the Company’s operationsthese disruptions continues to evolve and may have an adverse impact on the Company’s operationsconflict in future periods. The Company continues to monitor the short- and long-term impactsUkraine has added another layer of the pandemic, including the current supply chain disruptions.

We continueThe Company continues to monitor developments involving our workforce, customers, suppliers and vendors and take steps to mitigate against additional impacts, but given the unprecedented and evolving nature of these circumstances, weit cannot predict the full extent of the impact that the economic disruptions caused by COVID-19 will have on ourthe Company's operating results, financial condition and liquidity.

Outlook for 20222023

The Company continues to focus on creating value for building owners by targeting opportunities for long-term relationships with the vision of becoming an indispensable partner to building owners with mission-critical systems. For 2022,2023, the Company has reviewed its operations and has determined that it is continuingplans to takecontinue taking steps to focus on the following key areasareas: (i) increasingimprove profitability, operating cash flows and actions oriented to maintaining sufficient liquidity, (ii) continuing to emphasize ODRfocus on ODR-related work with an emphasis on dedicated account relationships (iii) invest in its workforce and (iii) targeting projects(iv) improve project execution and profitability in its GCR segment by remaining selective and pursuing processes that avoid or reduce exposure to jobs that create potential financial challenges for the Company.

In focusing on profitability and cash flows, among other things, the Company will continuehas dedicated and continues to aggressively pursue claimsdedicate, its resources toward the growth of its ODR segment as the scope of services provided within the Company’s ODR segment

typically yield higher margins when compared to its GCR segment work. The Company reaffirms its focus on expanding the number and breadth of owner relationships that it has asserted against project contractors, owners, engineers, consultants, subcontractors or others involved in projectsserves on a direct basis and to leverage these expanded owner-direct relationships to deliver a broad suite of services. In addition, the Company proactively manages its current accounts and maintains a high standard of dedication to those account relationships. The Company’s primary focus is working with customers where their systems are mission critical and have needs regardless of the macroeconomic environment. As it relates to the Company’s ODR-related work, the Company has incurred additional costs exceedingmade substantial investments to expand its ODR revenue by increasing the contract price orvalue it can offer to service and maintenance customers and continues to evaluate areas in which it could expand the breadth of its service offerings to better serve its clients. The Company is focused on its differentiated business model that combines engineering, craft labor and a true partner approach, all of which creates value for amounts not included in the original contract price.  Management believes that the resolutionits customers. This differentiated business model combines elements of such currently existingtraditional non-residential construction, building service and possible future claims will be a significant part ofmaintenance, energy services, data analytics and property management. Employee development underpins the Company’s success relatedefforts to profitability, liquidityexecute its 2023 strategy. The Company is actively concentrating managerial and financial performance. sales resources on training and hiring experienced employees to sell and profitably perform ODR-related work.

Additionally, the Company believes that it can further increase its cash flow and operating income by acquiring strategically synergistic companies that will supplement the Company’s current business model, address capability gaps and enhance the breadth of its service offerings to better serve its clients. The Company has dedicated, and continues to dedicate, its resources to seek opportunities to acquire businesses that have attractive market positions, a record of consistent positive cash flow, and desirable market locations. However, as a specialty contractor providing HVAC, plumbing, electrical and building controls design, engineering, installation and maintenance services in commercial, institutional and light industrial markets, our operating cash flows are subject to variability, including variability associated with winning, performing and closing work and projects. Additionally, our

The Company’s operating cash flows are also impacted by the timing related to the resolution of the uncertainties inherent in the complex nature of the work that we perform,it performs, including claims and back charge settlements. Although we believethe Company believes that we haveit has adequate plans related to providing sufficient operating working capital and liquidity in the short-term, the complex nature of the work we perform,the Company performs, including related to claims and back charge settlements could prove those plans to be incorrect. If those plans prove to be incorrect, ourthe Company’s financial position, results of operations, cash flows and liquidity could be materially and adversely impacted. 

As it relates to focusing on owner-direct work and ourthe Company’s focus on job selection and processes, we believethe Company believes that it is appropriate in the current contracting environment to reduce risk and exposure to large, complex, non-owner direct projects where the trend has been for such jobs to provide risks that are difficult to mitigate. Currently, management believes the historical industry pricing and associated risks for this type of work does not align with the Company’s stakeholders’ expectations and therefore

Seasonality, Cyclicality and Quarterly Trends

Severe weather can impact the Company’s operations. In the northern climates where it operates, and to a lesser extent the southern climates as well, severe winters can slow the Company’s productivity on construction projects, which shifts revenue and gross profit recognition to a later period. The Company’s maintenance operations may also be impacted by mild or severe weather. Mild weather tends to reduce demand for its maintenance services, whereas severe weather may increase the demand for its maintenance and spottime-and-materials services. The Company’s operations also experience mild cyclicality, as building owners typically work through maintenance and capital projects at an increased level during the third and fourth calendar quarters of each year.

Liquidity and Capital Resources

The Company’s liquidity needs relate primarily to the provision of working capital (defined as current assets less current liabilities) to support operations, funding of capital expenditures, and investment in strategic opportunities.opportunities such as acquisitions. Historically, liquidity has been provided by operating activities and borrowingborrowings from commercial banks and institutional lenders.

The following table presents summary cash flow information for the periods indicated:

The Company's cash flows are primarily impacted period to period by fluctuations in working capital. Factors such as the Company’s contract mix, commercial terms, days sales outstanding (“DSO”) and delays in the start of projects may impact its working capital. In line with industry practice, the Company accumulates costs during a given month then bills those costs in the current month for many of its contracts. While labor costs associated with these contracts are paid weekly and salary costs associated with the contracts are paid bi-weekly, certain subcontractor costs are generally not paid until the Company receives payment from its customers (contractual “pay-if-paid” terms). The Company has not historically experienced a large volume of write-offs related to its receivables and contract assets. The Company regularly assesses its receivables for collectability and provides allowances for doubtful accounts where appropriate. The Company believes that its reserves for doubtful accounts are appropriate as of December 31, 20212022 and 2020,2021, but adverse changes in the economic environment may impact certain of its customers’ ability to access capital and compensate the Company for its services, as well as impact project activity for the foreseeable future.

The Company's existing current backlog is projected to provide substantial coverage of forecasted GCR revenue for one year from the date of the financial statement issuance. The Company’s current cash balance, together with cash it expects to generate from future operations along with borrowings available under its credit facility, are expected to be sufficient to finance its short- and long-term capital requirements (or meet working capital requirements) for the next twelve months. In addition to the future operating cash flows of the Company, along with its existing borrowing availability and access to financial markets, the

The following table represents our summarized working capital information:

As discussed above and in Note 7 – Debt in the accompanying notes to the Company’s consolidated financial statements, as of December 31, 2021,2022, the Company was in compliance with all financial maintenance covenants as required by its credit facility.

The following is a summary of the significant sources (uses) of cash from operating activities:

Cash flows used in investing activities were $0.5 million for the year ended December 31, 2022 as compared to $19.3 million for the year ended December 31, 2021 as compared to $1.3 million for the year ended December 31, 2020.2021. Cash used in investing activities for the year ended December 31, 20212022 of $19.0$0.5 million represented cash outflows associated with the Jake Marshall Transaction, net$1.0 million of cash acquired. In addition, cash used in investing activities for the year ended December 31, 2021 of $0.8 million represented cash outflows for capital additions pertaining to additional non-leased vehicles, tools and equipment, computer software and hardware purchases, office furniture and office related leasehold improvements, offset by $0.5 million in cash proceeds from the sale of property and equipment. Cash used in investing activities for the year ended December 31, 20202021 of $1.5$19.3 million representedwas primarily due to the $19.0 million of cash outflows associated with the Jake Marshall Transaction, net of cash acquired. In addition, the Company used $0.8 million of cash for capital additions pertaining to additional non-leased vehicles, tools and equipment, computer software and hardware purchases, office furniture and office related leasehold improvements, offset by $0.2$0.5 million in cash proceeds from the sale of property and equipment.

For the years ended December 31, 20212022 and 2020,2021, the Company obtained the use of various assets through operating and finance leases, which reduced the level of capital expenditures that would have otherwise been necessary to operate our business.

Cash flows used in financing activities was $13.4 million for the year ended December 31, 2022 as compared to cash flows provided by financing activities wasof $15.9 million for the year ended December 31, 2021 as compared to cash flows used in financing activities of $4.7 million for2021. For the year ended December 31, 2020. 2022, the Company made principal payments of $13.4 million, consisting of monthly installment payments of $0.6 million, an Excess Cash Flow payment of $3.3 million and total Net Claim Proceeds payments of $2.7 million, The Company also borrowed and repaid $15.2 million under the A&R Wintrust Revolving Loan of $15.2 million, made payments of $2.7 million on finance leases, repurchased $2.0 million in common stock under the Company’s Share Repurchase Program (defined below), paid $0.4 million in taxes related to net share settlement of equity awards and incurred $0.4 million in payments for debt issuance costs. These financing cash outflows were partly offset by $5.4 million in proceeds from the Company’s sale-leaseback financing transaction and $0.3 million associated with proceeds from contributions to the Company’s Employee Stock Purchase Plan (“ESPP”).

For the year ended December 31, 2021, the Company received proceeds from the following: $22.8 million, net of fees and expenses, in conjunction with our common stock offering in February 2021, $2.0 million from the exercise of warrants, $30.0 million in connection with the 2021 Refinancing, $10.0 million associated with the A&R Wintrust Term Loan and $0.3 million associated with proceeds from contributions to the ESPP. These proceeds were partly offset by the $39.0 million payment in full of the 2019 Refinancing Term Loan and associated $1.4 million prepayment penalty and other extinguishment costs, $4.5 million and $0.6 million of scheduled principal payments on the Wintrust Term Loan and the A&R Wintrust Term Loan, respectively, $2.6 million for payments on finance leases, $0.5 million in taxes related to net share settlement of equity awards and $0.6 million for payments related to debt issuance costs related to the Wintrust Term Loan and Wintrust Revolving Loan.

Debt and Related Obligations

Long-term debt consists of the following obligations as of: