LMB

SEC source: 0001628280-22-000225 · wf-form4_164133680631710.xml · derivative · entry 7

PRATT GORDON G · CIK 0001409889 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,267

Underlying: Common Stock · 1,067 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F5 · derivative.exercise_date: This award of RSUs was granted on 01/01/2020. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2021, January 1, 2022 and January 1, 2023, subject to continued service through the applicable vesting date.

F5 · derivative.expiration_date: This award of RSUs was granted on 01/01/2020. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2021, January 1, 2022 and January 1, 2023, subject to continued service through the applicable vesting date.

SEC source: 0001628280-22-000225 · wf-form4_164133680631710.xml · derivative · entry 6

PRATT GORDON G · CIK 0001409889 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,334

Underlying: Common Stock · 1,067 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F4 · derivative.exercise_date: This award of RSUs was granted on 02/27/2019. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2020, January 1, 2021 and January 1, 2022, subject to continued service through the applicable vesting date.

F4 · derivative.expiration_date: This award of RSUs was granted on 02/27/2019. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2020, January 1, 2021 and January 1, 2022, subject to continued service through the applicable vesting date.

SEC source: 0001628280-22-000225 · wf-form4_164133680631710.xml · nonDerivative · entry 3

PRATT GORDON G · CIK 0001409889 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,799

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-22-000225 · wf-form4_164133680631710.xml · nonDerivative · entry 2

PRATT GORDON G · CIK 0001409889 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,733

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-22-000225 · wf-form4_164133680631710.xml · nonDerivative · entry 1

PRATT GORDON G · CIK 0001409889 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,666

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-22-000221 · wf-form4_164133674171436.xml · derivative · entry 7

Krzeminski Laurel J · CIK 0001493187 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,077

Underlying: Common Stock · 8,876 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F5 · derivative.exercise_date: This award of RSUs was granted on 01/01/2022. The RSUs are scheduled to cliff vest on January 1, 2023.

F5 · derivative.expiration_date: This award of RSUs was granted on 01/01/2022. The RSUs are scheduled to cliff vest on January 1, 2023.

SEC source: 0001628280-22-000221 · wf-form4_164133674171436.xml · derivative · entry 6

Krzeminski Laurel J · CIK 0001493187 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,201

Underlying: Common Stock · 1,066 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F4 · derivative.exercise_date: This award of RSUs was granted on 01/1/2021. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2022, January 1, 2023 and January 1, 2024, subject to continued service through the applicable vesting date

F4 · derivative.expiration_date: This award of RSUs was granted on 01/1/2021. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2022, January 1, 2023 and January 1, 2024, subject to continued service through the applicable vesting date

SEC source: 0001628280-22-000221 · wf-form4_164133674171436.xml · derivative · entry 5

Krzeminski Laurel J · CIK 0001493187 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,267

Underlying: Common Stock · 1,067 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F3 · derivative.exercise_date: This award of RSUs was granted on 01/01/2020. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2021, January 1, 2022 and January 1, 2023, subject to continued service through the applicable vesting date.

F3 · derivative.expiration_date: This award of RSUs was granted on 01/01/2020. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2021, January 1, 2022 and January 1, 2023, subject to continued service through the applicable vesting date.

SEC source: 0001628280-22-000221 · wf-form4_164133674171436.xml · derivative · entry 4

Krzeminski Laurel J · CIK 0001493187 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,334

Underlying: Common Stock · 1,067 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F2 · derivative.exercise_date: This award of RSUs was granted on 02/27/2019. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2020, January 1, 2021 and January 1, 2022, subject to continued service through the applicable vesting date.

F2 · derivative.expiration_date: This award of RSUs was granted on 02/27/2019. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2020, January 1, 2021 and January 1, 2022, subject to continued service through the applicable vesting date.

SEC source: 0001628280-22-000221 · wf-form4_164133674171436.xml · nonDerivative · entry 3

Krzeminski Laurel J · CIK 0001493187 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,099

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-22-000221 · wf-form4_164133674171436.xml · nonDerivative · entry 2

Krzeminski Laurel J · CIK 0001493187 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,033

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-22-000221 · wf-form4_164133674171436.xml · nonDerivative · entry 1

Krzeminski Laurel J · CIK 0001493187 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,966

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-22-000222 · wf-form4_164133675745047.xml · derivative · entry 8

Bacon Charles A. III · CIK 0001679798 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 89,253

Underlying: Common Stock · 25,641 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3.

F6 · derivative.exercise_date: This award of RSUs was granted on 1/1/2022. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2023, January 1, 2024 and January 1, 2025, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSU's will be reported on a Form 4 within two business days of the date of such determination.

F6 · derivative.expiration_date: This award of RSUs was granted on 1/1/2022. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2023, January 1, 2024 and January 1, 2025, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-22-000222 · wf-form4_164133675745047.xml · derivative · entry 7

Bacon Charles A. III · CIK 0001679798 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 63,612

Underlying: Common Stock · 3,889 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3.

F5 · derivative.exercise_date: This award of RSUs was granted on 1/1/2021. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2022, January 1, 2023 and January 1, 2024, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSU's will be reported on a Form 4 within two business days of the date of such determination.

F5 · derivative.expiration_date: This award of RSUs was granted on 1/1/2021. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2022, January 1, 2023 and January 1, 2024, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-22-000222 · wf-form4_164133675745047.xml · derivative · entry 6

Bacon Charles A. III · CIK 0001679798 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 67,501

Underlying: Common Stock · 5,833 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3.

F4 · derivative.exercise_date: This award of RSUs was granted on 01/01/2020. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2021, January 1, 2022 and January 1, 2023, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSUs will be reported on a Form 4 within two business days of the date of such determination.

F3 · derivative.expiration_date: This award of RSUs was granted on 02/27/2019. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2020, January 1, 2021 and January 1, 2022, subject to continued service through the applicable vesting date.

SEC source: 0001628280-22-000222 · wf-form4_164133675745047.xml · derivative · entry 5

Bacon Charles A. III · CIK 0001679798 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 73,334

Underlying: Common Stock · 11,667 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3.

F3 · derivative.exercise_date: This award of RSUs was granted on 02/27/2019. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2020, January 1, 2021 and January 1, 2022, subject to continued service through the applicable vesting date.

F3 · derivative.expiration_date: This award of RSUs was granted on 02/27/2019. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2020, January 1, 2021 and January 1, 2022, subject to continued service through the applicable vesting date.

SEC source: 0001628280-22-000222 · wf-form4_164133675745047.xml · nonDerivative · entry 4

Bacon Charles A. III · CIK 0001679798 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 436,705

F1 · balance_after: Reflect the withholding of 9,289 shares by Limbach Holdings, Inc. (the "Company") to satisfy tax withholding requirements not previously reported. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-22-000222 · wf-form4_164133675745047.xml · nonDerivative · entry 3

Bacon Charles A. III · CIK 0001679798 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 445,516

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Reflect the withholding of 9,289 shares by Limbach Holdings, Inc. (the "Company") to satisfy tax withholding requirements not previously reported. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-22-000222 · wf-form4_164133675745047.xml · nonDerivative · entry 2

Bacon Charles A. III · CIK 0001679798 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 441,627

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Reflect the withholding of 9,289 shares by Limbach Holdings, Inc. (the "Company") to satisfy tax withholding requirements not previously reported. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-22-000222 · wf-form4_164133675745047.xml · nonDerivative · entry 1

Bacon Charles A. III · CIK 0001679798 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 435,794

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Reflect the withholding of 9,289 shares by Limbach Holdings, Inc. (the "Company") to satisfy tax withholding requirements not previously reported. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-22-000230 · wf-form4_164133693939305.xml · nonDerivative · entry 1

ALVARADO LINDA G · CIK 0001122788 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,099

SEC source: 0001628280-22-000229 · wf-form4_164133690388891.xml · derivative · entry 6

Brooks Jayme L. · CIK 0001447591 · EVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,667

Underlying: Common Stock · 2,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3.

F3 · derivative.exercise_date: This award of RSUs was granted on October 1, 2019. 42,215 shares of common stock subject to this award are subject to service-based vesting conditions and vest on the one-year anniversary of the grant date, subject to continued service through such vesting date. 6,000 shares of common stock subject to this award are subject to service-based vesting conditions and vest in equal annual installments on each of December 31, 2020, 2021 and 2022, subject to continued service through such vesting date. The remaining 6,000 shares of common stock subject to this award shall vest upon the Company's achievement of cumulative adjusted EBITDA of the Company of at least $75,000,000 for fiscal years 2019, 2020 and 2021 (the "Performance Milestone"), subject to Participant's continuous service with the Company or a subsidiary or affiliate of the Company, as applicable, as an employee through the certification by the Compensation Committee of the achievement of the Performance Milestone, if applicable.

F3 · derivative.expiration_date: This award of RSUs was granted on October 1, 2019. 42,215 shares of common stock subject to this award are subject to service-based vesting conditions and vest on the one-year anniversary of the grant date, subject to continued service through such vesting date. 6,000 shares of common stock subject to this award are subject to service-based vesting conditions and vest in equal annual installments on each of December 31, 2020, 2021 and 2022, subject to continued service through such vesting date. The remaining 6,000 shares of common stock subject to this award shall vest upon the Company's achievement of cumulative adjusted EBITDA of the Company of at least $75,000,000 for fiscal years 2019, 2020 and 2021 (the "Performance Milestone"), subject to Participant's continuous service with the Company or a subsidiary or affiliate of the Company, as applicable, as an employee through the certification by the Compensation Committee of the achievement of the Performance Milestone, if applicable.

SEC source: 0001628280-22-000229 · wf-form4_164133690388891.xml · nonDerivative · entry 2

Brooks Jayme L. · CIK 0001447591 · EVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,205

F1 · balance_after: Reflect the withholding of 2,169 shares by Limbach Holdings, Inc. (the "Company") to satisfy tax withholding requirements not previously reported. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-22-000229 · wf-form4_164133690388891.xml · nonDerivative · entry 1

Brooks Jayme L. · CIK 0001447591 · EVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,952

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Reflect the withholding of 2,169 shares by Limbach Holdings, Inc. (the "Company") to satisfy tax withholding requirements not previously reported. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001104659-21-150599 · tm2135721d1_4.xml · nonDerivative · entry 3

Horowitz Joshua · CIK 0001612424 · Director

Palm Management (US) LLC · CIK 0001726497 · Director

Palm Global Small Cap Master Fund LP · CIK 0001726444 · Director

Palmer Bradley C · CIK 0001726523 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Palm Global Small Cap Master Fund LP

Disclosed balance after: 233,517

F5 · price: The price reported represents a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.25 to $7.35 per share. The Reporting Persons undertake to provide to the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

F1 · balance_after: The reported shares are owned directly by Palm Global Small Cap Master Fund LP (the "Fund"). Palm Management (US) LLC ("Palm Management"), as the investment manager of the Fund, may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his positions with the Fund and Palm Management, Mr. Joshua S. Horowitz may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his position with Palm Management, Mr. Bradley C. Palmer may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Messrs. Palmer and Horowitz disclaim beneficial ownership of these shares except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-21-150599 · tm2135721d1_4.xml · nonDerivative · entry 2

Horowitz Joshua · CIK 0001612424 · Director

Palm Management (US) LLC · CIK 0001726497 · Director

Palm Global Small Cap Master Fund LP · CIK 0001726444 · Director

Palmer Bradley C · CIK 0001726523 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Palm Global Small Cap Master Fund LP

Disclosed balance after: 230,583

F4 · price: The price reported represents a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.21 to $7.29 per share. The Reporting Persons undertake to provide to the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

F1 · balance_after: The reported shares are owned directly by Palm Global Small Cap Master Fund LP (the "Fund"). Palm Management (US) LLC ("Palm Management"), as the investment manager of the Fund, may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his positions with the Fund and Palm Management, Mr. Joshua S. Horowitz may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his position with Palm Management, Mr. Bradley C. Palmer may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Messrs. Palmer and Horowitz disclaim beneficial ownership of these shares except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-21-150599 · tm2135721d1_4.xml · nonDerivative · entry 1

Horowitz Joshua · CIK 0001612424 · Director

Palm Management (US) LLC · CIK 0001726497 · Director

Palm Global Small Cap Master Fund LP · CIK 0001726444 · Director

Palmer Bradley C · CIK 0001726523 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Palm Global Small Cap Master Fund LP

Disclosed balance after: 227,083

F1 · balance_after: The reported shares are owned directly by Palm Global Small Cap Master Fund LP (the "Fund"). Palm Management (US) LLC ("Palm Management"), as the investment manager of the Fund, may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his positions with the Fund and Palm Management, Mr. Joshua S. Horowitz may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his position with Palm Management, Mr. Bradley C. Palmer may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Messrs. Palmer and Horowitz disclaim beneficial ownership of these shares except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-21-148244 · tm2135085-1_4seq1.xml · nonDerivative · entry 3

Horowitz Joshua · CIK 0001612424 · Director

Palm Management (US) LLC · CIK 0001726497 · Director

Palm Global Small Cap Master Fund LP · CIK 0001726444 · Director

Palmer Bradley C · CIK 0001726523 · Director by Deputization

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Palm Global Small Cap Master Fund LP

Disclosed balance after: 222,411

F4 · price: The price reported represents a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.50 to $7.60 per share. The Reporting Persons undertake to provide to the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

F1 · balance_after: The reported shares are owned directly by Palm Global Small Cap Master Fund LP (the "Fund"). Palm Management (US) LLC ("Palm Management"), as the investment manager of the Fund, may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his positions with the Fund and Palm Management, Mr. Joshua S. Horowitz may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his position with Palm Management, Mr. Bradley C. Palmer may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Messrs. Palmer and Horowitz disclaim beneficial ownership of these shares except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-21-148244 · tm2135085-1_4seq1.xml · nonDerivative · entry 2

Horowitz Joshua · CIK 0001612424 · Director

Palm Management (US) LLC · CIK 0001726497 · Director

Palm Global Small Cap Master Fund LP · CIK 0001726444 · Director

Palmer Bradley C · CIK 0001726523 · Director by Deputization

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Palm Global Small Cap Master Fund LP

Disclosed balance after: 214,600

F3 · price: The price reported represents a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.60 to $7.95 per share. The Reporting Persons undertake to provide to the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

F1 · balance_after: The reported shares are owned directly by Palm Global Small Cap Master Fund LP (the "Fund"). Palm Management (US) LLC ("Palm Management"), as the investment manager of the Fund, may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his positions with the Fund and Palm Management, Mr. Joshua S. Horowitz may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his position with Palm Management, Mr. Bradley C. Palmer may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Messrs. Palmer and Horowitz disclaim beneficial ownership of these shares except to the extent of their respective pecuniary interest therein.

SEC source: 0001628280-21-024841 · wf-form4_163917020113698.xml · nonDerivative · entry 1

Bacon Charles A. III · CIK 0001679798 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 433,416

SEC source: 0001104659-21-148244 · tm2135085-1_4seq1.xml · nonDerivative · entry 1

Horowitz Joshua · CIK 0001612424 · Director

Palm Management (US) LLC · CIK 0001726497 · Director

Palm Global Small Cap Master Fund LP · CIK 0001726444 · Director

Palmer Bradley C · CIK 0001726523 · Director by Deputization

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Palm Global Small Cap Master Fund LP

Disclosed balance after: 189,600

F2 · price: The price reported represents a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.58 to $7.60 per share. The Reporting Persons undertake to provide to the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

F1 · balance_after: The reported shares are owned directly by Palm Global Small Cap Master Fund LP (the "Fund"). Palm Management (US) LLC ("Palm Management"), as the investment manager of the Fund, may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his positions with the Fund and Palm Management, Mr. Joshua S. Horowitz may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his position with Palm Management, Mr. Bradley C. Palmer may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Messrs. Palmer and Horowitz disclaim beneficial ownership of these shares except to the extent of their respective pecuniary interest therein.

SEC source: 0001628280-21-024769 · wf-form4_163908410180305.xml · nonDerivative · entry 1

Krzeminski Laurel J · CIK 0001493187 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,899

SEC source: 0001122788-21-000010 · wf-form4_163052782990951.xml · derivative · entry 1

ALVARADO LINDA G · CIK 0001122788 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,508

Underlying: Common Stock · 2,508 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F2 · derivative.exercise_date: This award of RSUs was granted on 09/1/2021. The award is subject to service-based vesting conditions and vests 14.92% on January 1, 2022 and 42.54% on each of January 1, 2023 and January 1, 2024, subject to continued service through the applicable vesting date.

F2 · derivative.expiration_date: This award of RSUs was granted on 09/1/2021. The award is subject to service-based vesting conditions and vests 14.92% on January 1, 2022 and 42.54% on each of January 1, 2023 and January 1, 2024, subject to continued service through the applicable vesting date.

SEC source: 0001628280-21-017800 · wf-form4_163035926560471.xml · derivative · entry 4

SWETS LARRY G JR · CIK 0001409891 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,200 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F4 · derivative.exercise_date: This award of RSU's was granted on 01/01/2021. The Company accelerated vesting of this RSU Award on August 26, 2021 in connection with the Reporting Person's resignation from the Board.

F4 · derivative.expiration_date: This award of RSU's was granted on 01/01/2021. The Company accelerated vesting of this RSU Award on August 26, 2021 in connection with the Reporting Person's resignation from the Board.

SEC source: 0001628280-21-017800 · wf-form4_163035926560471.xml · derivative · entry 3

SWETS LARRY G JR · CIK 0001409891 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,200

Underlying: Common Stock · 2,134 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F3 · derivative.exercise_date: This award of RSU's was granted on 01/01/2020. The Company accelerated vesting of this RSU Award on August 26, 2021 in connection with the Reporting Person's resignation from the Board.

F3 · derivative.expiration_date: This award of RSU's was granted on 01/01/2020. The Company accelerated vesting of this RSU Award on August 26, 2021 in connection with the Reporting Person's resignation from the Board.

SEC source: 0001628280-21-017800 · wf-form4_163035926560471.xml · derivative · entry 2

SWETS LARRY G JR · CIK 0001409891 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,334

Underlying: Common Stock · 1,067 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F2 · derivative.exercise_date: This award of RSU's was granted on 02/27/2019. The Company accelerated vesting of this RSU Award on August 26, 2021 in connection with the Reporting Person's resignation from the Board.

F2 · derivative.expiration_date: This award of RSU's was granted on 02/27/2019. The Company accelerated vesting of this RSU Award on August 26, 2021 in connection with the Reporting Person's resignation from the Board.

SEC source: 0001628280-21-017800 · wf-form4_163035926560471.xml · nonDerivative · entry 1

SWETS LARRY G JR · CIK 0001409891 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

SEC source: 0001104659-21-084022 · tm2120401-1_4seq1.xml · nonDerivative · entry 2

Horowitz Joshua · CIK 0001612424 · Director

Palm Management (US) LLC · CIK 0001726497 · Director

Palm Global Small Cap Master Fund LP · CIK 0001726444 · Director

Palmer Bradley C · CIK 0001726523 · Director by Deputization

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Palm Global Small Cap Master Fund LP

Disclosed balance after: 184,889

F3 · price: The price reported represents a weighted average price. These shares were purchased in multiple transactions at prices ranging from $9.03 and $9.05 per share. The Reporting Persons undertake to provide to the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

F1 · balance_after: The reported shares are owned directly by Palm Global Small Cap Master Fund LP (the "Fund"). Palm Management (US) LLC ("Palm Management"), as the investment manager of the Fund, may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his positions with the Fund and Palm Management, Mr. Joshua S. Horowitz may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his position with Palm Management, Mr. Bradley C. Palmer may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Messrs. Palmer and Horowitz disclaim beneficial ownership of these shares except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-21-084022 · tm2120401-1_4seq1.xml · nonDerivative · entry 1

Horowitz Joshua · CIK 0001612424 · Director

Palm Management (US) LLC · CIK 0001726497 · Director

Palm Global Small Cap Master Fund LP · CIK 0001726444 · Director

Palmer Bradley C · CIK 0001726523 · Director by Deputization

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Palm Global Small Cap Master Fund LP

Disclosed balance after: 179,889

F2 · price: The price reported represents a weighted average price. These shares were purchased in multiple transactions at prices ranging from $9.15 and $9.24 per share. The Reporting Persons undertake to provide to the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

F1 · balance_after: The reported shares are owned directly by Palm Global Small Cap Master Fund LP (the "Fund"). Palm Management (US) LLC ("Palm Management"), as the investment manager of the Fund, may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his positions with the Fund and Palm Management, Mr. Joshua S. Horowitz may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his position with Palm Management, Mr. Bradley C. Palmer may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Messrs. Palmer and Horowitz disclaim beneficial ownership of these shares except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-21-078390 · tm2119184-1_4seq1.xml · nonDerivative · entry 2

Horowitz Joshua · CIK 0001612424 · Director

Palm Management (US) LLC · CIK 0001726497 · Director

Palm Global Small Cap Master Fund LP · CIK 0001726444 · Director

Palmer Bradley C · CIK 0001726523 · Director by Deputization

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Palm Global Small Cap Master Fund LP

Disclosed balance after: 178,382

F3 · price: The price reported represents a weighted average price. These shares were purchased in multiple transactions at prices ranging from $9.29 and $9.52 per share. The Reporting Persons undertake to provide to the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

F1 · balance_after: The reported shares are owned directly by Palm Global Small Cap Master Fund LP (the "Fund"). Palm Management (US) LLC ("Palm Management"), as the investment manager of the Fund, may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his positions with the Fund and Palm Management, Mr. Joshua S. Horowitz may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his position with Palm Management, Mr. Bradley C. Palmer may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Messrs. Palmer and Horowitz disclaim beneficial ownership of these shares except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-21-078390 · tm2119184-1_4seq1.xml · nonDerivative · entry 1

Horowitz Joshua · CIK 0001612424 · Director

Palm Management (US) LLC · CIK 0001726497 · Director

Palm Global Small Cap Master Fund LP · CIK 0001726444 · Director

Palmer Bradley C · CIK 0001726523 · Director by Deputization

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Palm Global Small Cap Master Fund LP

Disclosed balance after: 176,912

F2 · price: The price reported represents a weighted average price. These shares were purchased in multiple transactions at prices ranging from $9.21 and $9.32 per share. The Reporting Persons undertake to provide to the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

F1 · balance_after: The reported shares are owned directly by Palm Global Small Cap Master Fund LP (the "Fund"). Palm Management (US) LLC ("Palm Management"), as the investment manager of the Fund, may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his positions with the Fund and Palm Management, Mr. Joshua S. Horowitz may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Due to his position with Palm Management, Mr. Bradley C. Palmer may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by the Fund. Messrs. Palmer and Horowitz disclaim beneficial ownership of these shares except to the extent of their respective pecuniary interest therein.

SEC source: 0001628280-21-006381 · wf-form4_161731173141537.xml · nonDerivative · entry 2

Bacon Charles A. III · CIK 0001679798 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 430,170

SEC source: 0001628280-21-006381 · wf-form4_161731173141537.xml · nonDerivative · entry 1

Bacon Charles A. III · CIK 0001679798 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 427,170

SEC source: 0001104659-21-044985 · tm2111596d1_4.xml · nonDerivative · entry 2

Brooks Jayme L. · CIK 0001447591 · EVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,121

SEC source: 0001104659-21-044985 · tm2111596d1_4.xml · nonDerivative · entry 1

Brooks Jayme L. · CIK 0001447591 · EVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,896

SEC source: 0001628280-21-000071 · wf-form4_160988306794329.xml · derivative · entry 11

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,334

Underlying: Common Stock · 11,667 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F7 · derivative.exercise_date: This award of RSUs was granted on 1/1/2021. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2022, January 1, 2023 and January 1, 2024, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSU's will be reported on a Form 4 within two business days of the date of such determination.

F7 · derivative.expiration_date: This award of RSUs was granted on 1/1/2021. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2022, January 1, 2023 and January 1, 2024, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-21-000071 · wf-form4_160988306794329.xml · derivative · entry 10

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,667

Underlying: Common Stock · 2,500 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F6 · derivative.exercise_date: This award of RSUs was granted on 05/11/2020. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2021, January 1, 2022 and January 1, 2023, subject to continued employment through the applicable vesting date.

F6 · derivative.expiration_date: This award of RSUs was granted on 05/11/2020. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2021, January 1, 2022 and January 1, 2023, subject to continued employment through the applicable vesting date.

SEC source: 0001628280-21-000071 · wf-form4_160988306794329.xml · derivative · entry 9

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,167

Underlying: Common Stock · 3,333 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F5 · derivative.exercise_date: This award of RSUs was granted on 01/01/2020. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2021, January 1, 2022 and January 1, 2023, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSUs will be reported on a Form 4 within two business days of the date of such determination.

F5 · derivative.expiration_date: This award of RSUs was granted on 01/01/2020. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2021, January 1, 2022 and January 1, 2023, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSUs will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-21-000071 · wf-form4_160988306794329.xml · derivative · entry 8

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,500

Underlying: Common Stock · 4,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F4 · derivative.exercise_date: This award of RSUs was granted on 02/27/2019. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2020, January 1, 2021 and January 1, 2022, subject to continued service through the applicable vesting date.

F4 · derivative.expiration_date: This award of RSUs was granted on 02/27/2019. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2020, January 1, 2021 and January 1, 2022, subject to continued service through the applicable vesting date.

SEC source: 0001628280-21-000071 · wf-form4_160988306794329.xml · derivative · entry 7

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,500

Underlying: Common Stock · 334 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") common stock, exempt under Rule 16b-3.

F3 · derivative.exercise_date: This award of RSUs was granted on 08/03/2018. The award is subject to service-based vesting conditions and vests in equal installments on each of January 1, 2019, January 1, 2020 and January 1, 2021, subject to continued employment through the applicable vesting date.

F3 · derivative.expiration_date: This award of RSUs was granted on 08/03/2018. The award is subject to service-based vesting conditions and vests in equal installments on each of January 1, 2019, January 1, 2020 and January 1, 2021, subject to continued employment through the applicable vesting date.