Limbach Holdings, Inc.

The following table summarizes the total compensation of our principal executive officer (“PEO”) and the average of the total compensation of our other NEOs as reported in the Summary Compensation Table for the past five fiscal years, as well as their Compensation Actually Paid as calculated pursuant to Item 402(v) of Regulation S-K and certain performance measures required by Item 402(v) of Regulation S-K. Compensation Actually Paid, as determined under SEC requirements, does not reflect the actual amount of compensation earned by or paid to our executive officers during a covered year. For further information concerning the Company’s pay for performance philosophy and how the Company aligns executive compensation with the Company’s performance, refer to the CD&A.

(1)During 2023, both Mr. McCann and Charles A. Bacon, III served as the PEO. Mr. Bacon served as President and Chief Executive Officer in 2021, 2022 and through March 28, 2023 and Mr. McCann served as President and Chief Executive Officer beginning on March 29, 2023. The dollar amounts reported reflect the amounts of total compensation reported for each of our PEOs.

(2)The dollar amounts reported represent the amount of Compensation Actually Paid, as computed in accordance with SEC rules. The dollar amounts reported are the amounts of total compensation reported for Mr. McCann and Mr. Bacon during the applicable years, as adjusted to (i) the year-end value of equity awards granted during the reported year, (ii) the change in the value of equity awards that were unvested at the end of the prior year, measured through the date the awards vested, or through the end of the reported fiscal year, and (iii) the value of equity awards issued and vested during the reported fiscal year. See Table below for further information regarding the calculation for Compensation Actually Paid to CEO.

For service-based RSUs, fair value is based on the closing price of the Company’s common stock on the applicable measurement date. For performance-based RSUs, fair value reflects the probable outcome of the applicable performance conditions as of the measurement date, consistent with ASC 718. For market-based RSUs, including those tied to relative TSR, fair value is determined as of each measurement date using a valuation methodology consistent with ASC 718, such as a Monte Carlo simulation model, reflecting updated assumptions and performance expectations.

(3)The dollar amounts reported are the average of the total compensation reported for our NEOs, other than our PEO, for each applicable fiscal year. For fiscal years 2024 and 2025 this includes Ms. Brooks, Mr. Sharp and Mr. Angerosa. For fiscal year 2023, this includes Ms. Brooks and Mr. Sharp. For fiscal years 2022 and 2021, this includes Ms. Brooks and Mr. McCann.

(4)The dollar amounts reported represent the average amount of “Compensation Actually Paid”, as computed in accordance with SEC rules, for our NEOs, other than Mr. McCann for fiscal years 2025, 2024 and 2023 and Mr. Bacon for fiscal years 2023, 2022 and 2021 in the Summary Compensation Table. The calculation methodology is consistent with that described in footnote (2), including the adjustments to total compensation for equity award valuation.

(5)The amounts reported represent cumulative TSR of the Company under SEC rules from December 31, 2020, the last trading day of 2020, through the last trading day for the applicable year in the table. TSR assumes an initial fixed investment of $100 on December 31, 2020 and reinvestment of all dividends, and reflects the change in the Company’s stock price over the measurement period.

(6) The amounts reported in column represent the peer group TSR under SEC rules, from December 31, 2020, the last trading day of 2020, through the last trading day for the applicable year in the table, assuming reinvestment of dividends and weighted according to the respective companies’ stock market capitalization at the beginning of each period for which a return is indicated. The peer group used for this purpose is the Benchmark Index, and TSR is calculated in the same manner as the Company’s TSR.

(7)Refer to Annex A for a reconciliation of the Company’s non-GAAP financial measures included in this Proxy Statement. Adjusted EBITDA is the Company-selected measure for purposes of Item 402(v) of Regulation S-K. While the Company transitioned to market-based long-term incentive awards tied to relative TSR beginning in 2025, Adjusted EBITDA continues to be an important financial performance metric used by management to evaluate operating performance.

The following tables present the adjustments made to calculate “Compensation Actually Paid” to our CEO and, on an average basis, to our Non-CEO NEOs for each fiscal year presented. These amounts are derived from the “Total” compensation reported in the Summary Compensation Table and adjusted in accordance with Item 402(v) of Regulation S-K.

(1) Represents the grant date fair value of the equity awards as reported in the Summary Compensation Table, computed in accordance with ASC 718.

(2) Represents the fair value as of the end of the applicable fiscal year of equity awards granted during such year that remained outstanding and unvested as of year-end, determined in accordance with Item 402(v) of Regulation S-K and ASC 718.

(3) Represents the year-over-year change in the fair value of unvested equity awards granted in prior years, calculated as the difference between the fair value of such awards as of the end of the current fiscal year and the fair value of such awards as of the end of the prior fiscal year, determined in accordance with ASC 718. For service-based awards, fair value is based on the closing price of the Company’s

common stock on the applicable measurement date. For performance-based awards granted prior to 2025, fair value reflects the probable outcome of the applicable performance conditions as of the measurement date.

(4) As noted within the Summary Compensation Table, Mr. Bacon was granted 1,151 service-based RSU awards on April 30, 2023 for his services as a non-employee Director, which vested on the date of the 2023 Annual Meeting. The amount disclosed above represents the fair value increase of the awards at the time of vesting. The grant date fair value of these awards were included in “All Other Compensation” within the Summary Compensation Table.

(5) For 2025, the amount represents the change in fair value associated with certain performance-based RSUs granted in prior years that vested during 2025. The amount is calculated as the difference between the fair value of such awards as of December 31, 2024 and the fair value of such awards on the applicable vesting date in 2025, determined in accordance with ASC 718. For performance-based awards, fair value reflects the level of achievement of the applicable performance conditions as of the vesting date. For these awards, the applicable performance factor as of the vesting date was 150% of target.

(6) Reflects the grant date fair value of certain service-based and performance-based RSUs that were forfeited by Mr. Bacon as a result of his employment transition.

Relationship between Pay and Performance

Relationship Between Compensation Actually Paid, Company TSR And Peer Group TSR

The following chart sets forth the relationship between Compensation Actually Paid to our CEO, the average of Compensation Actually Paid to our Non-CEO NEOs, and the Company’s cumulative TSR over the five most recently completed fiscal years to that of the Peer Group over the same period.

Relationship Between Compensation Actually Paid And Net Income

The following chart sets forth the relationship between Compensation Actually Paid to our CEO, the average of Compensation Actually Paid to our Non-CEO NEOs, and our Net Income during the five most recently completed fiscal years.

Relationship Between Compensation Actually Paid And Adjusted EBITDA

The following chart sets forth the relationship between Compensation Actually Paid to our CEO, the average of Compensation Actually Paid to our Non-CEO NEOs, and our Adjusted EBITDA during the five most recently completed fiscal years.

Refer to Annex A for a reconciliation of the Company’s non-GAAP financial measures included in this Proxy Statement. We believe that Adjusted EBITDA is meaningful to our investors to enhance their understanding of our financial performance for the current period and our ability to generate cash flows from operations that are available for taxes, capital expenditures and debt service. We define Adjusted EBITDA as net income plus depreciation and amortization expense, interest expense, and taxes, as further adjusted to eliminate the impact of, when applicable, other non-cash items or expenses that are unusual or non-recurring that we believe do not reflect our core operating results. Compensation Actually Paid, as required under SEC rules, reflects adjusted values for unvested and vested equity awards during the years shown in the table based on year-end stock prices and various accounting valuation assumptions, but may not necessarily reflect actual amounts paid out for those awards.

Tabular List of Most Important Financial Performance Measures

The following table presents the financial performance measures that the Company considers to have been the most important in linking Compensation Actually Paid to our CEO and other NEOs for 2025 to Company performance. The measures in this table are not ranked.

GAAP Net Income

Adjusted EBITDA*

Adjusted EBITDA Margin*

(*)Each defined by the Company within Annex A.