LMB

SEC source: 0001628280-21-000067 · wf-form4_160988295841215.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 04/13/2018. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2019, January 1, 2020 and January 1, 2021, subject to continued service through the applicable vesting date.

F4 · derivative.expiration_date: This award of RSUs was granted on 04/13/2018. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2019, January 1, 2020 and January 1, 2021, subject to continued service through the applicable vesting date.

SEC source: 0001628280-21-000067 · wf-form4_160988295841215.xml · nonDerivative · entry 3

PRATT GORDON G · CIK 0001409889 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,599

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: 0001628280-21-000067 · wf-form4_160988295841215.xml · nonDerivative · entry 2

PRATT GORDON G · CIK 0001409889 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,533

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: 0001628280-21-000067 · wf-form4_160988295841215.xml · nonDerivative · entry 1

PRATT GORDON G · CIK 0001409889 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,466

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: 0001628280-21-000077 · wf-form4_160988331509935.xml · derivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,000

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.

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

F2 · derivative.exercise_date: As reported in the original filing of this Form 4 on October 1, 2019, this award of RSUs was granted on October 1, 2019. 42,215 shares of common stock subject to this award were subject to service-based vesting conditions and vested on October 1, 2020. 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 certain performance milestones, 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 such performance milestones, if applicable.

F2 · derivative.expiration_date: As reported in the original filing of this Form 4 on October 1, 2019, this award of RSUs was granted on October 1, 2019. 42,215 shares of common stock subject to this award were subject to service-based vesting conditions and vested on October 1, 2020. 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 certain performance milestones, 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 such performance milestones, if applicable.

SEC source: 0001628280-21-000077 · wf-form4_160988331509935.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 43,530

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: 0001628280-20-014210 · wf-form4_160167594600386.xml · derivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,000

Underlying: Common Stock · 42,215 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. common stock, exempt under Rule 16b-3.

F1 · price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Limbach Holdings, Inc. 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: 0001628280-20-014210 · wf-form4_160167594600386.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,530

F2 · shares: Transaction reflects withholding of shares to satisfy tax liabilities associated with vesting of restricted stock units.

SEC source: 0001628280-20-014210 · wf-form4_160167594600386.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,810

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. common stock, exempt under Rule 16b-3.

SEC source: 0001628280-20-014052 · wf-form4_160150088518815.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 402,927

F1 · price: The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $9.34 to $9.50, inclusive. The reporting person undertakes to provide to Limbach Holdings, Inc. (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 within the range set forth in this footnote.

SEC source: 0001628280-20-013918 · wf-form4_160106657040576.xml · nonDerivative · entry 1

1347 Investors LLC · CIK 0001612411 · Director · See Remarks

SWETS LARRY G JR · CIK 0001409891 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · ownership.direct: The securities are held directly by 1347 Investors LLC ("1347 Investors"). Larry G. Swets, Jr. is a manager of 1347 Investors with share voting and dispositive control over the securities held by 1347 Investors. Accordingly, Mr. Swets may be deemed to share beneficial ownership over the securities held directly by 1347 Investors. Each of the Reporting Persons disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein, and this Report shall not be deemed an admission that the Reporting Persons are the beneficial owners of the securities for purposes of Section 16 or for any other purpose.

F2 · ownership.direct: Mr. Swets serves on the Board of Directors of the Issuer. Mr. Swets holds 16,399 shares of common stock of the Issuer, and Mr. Swets holds 6,401 restricted stock units granted by the Issuer. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock upon vesting.

SEC source: 0001104659-20-109249 · tm2031924d1_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 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: 171,062

F3 · price: The price reported represents a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.95 and $8.20 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: 0001104659-20-109249 · tm2031924d1_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 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: 142,125

F2 · price: The price reported represents a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.7025 and $7.85 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: 0001628280-20-013890 · wf-form4_160097919995946.xml · nonDerivative · entry 2

1347 Investors LLC · CIK 0001612411 · Director · See Remarks

SWETS LARRY G JR · CIK 0001409891 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 54,655

F1 · ownership.direct: The securities are held directly by 1347 Investors LLC ("1347 Investors"). Larry G. Swets, Jr. is a manager of 1347 Investors with share voting and dispositive control over the securities held by 1347 Investors. Accordingly, Mr. Swets may be deemed to share beneficial ownership over the securities held directly by 1347 Investors. Each of the Reporting Persons disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein, and this Report shall not be deemed an admission that the Reporting Persons are the beneficial owners of the securities for purposes of Section 16 or for any other purpose.

F2 · ownership.direct: Mr. Swets serves on the Board of Directors of the Issuer. Mr. Swets holds 16,399 shares of common stock of the Issuer, and Mr. Swets holds 6,401 restricted stock units granted by the Issuer. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock upon vesting.

SEC source: 0001628280-20-013890 · wf-form4_160097919995946.xml · nonDerivative · entry 1

1347 Investors LLC · CIK 0001612411 · Director · See Remarks

SWETS LARRY G JR · CIK 0001409891 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 54,770

F1 · ownership.direct: The securities are held directly by 1347 Investors LLC ("1347 Investors"). Larry G. Swets, Jr. is a manager of 1347 Investors with share voting and dispositive control over the securities held by 1347 Investors. Accordingly, Mr. Swets may be deemed to share beneficial ownership over the securities held directly by 1347 Investors. Each of the Reporting Persons disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein, and this Report shall not be deemed an admission that the Reporting Persons are the beneficial owners of the securities for purposes of Section 16 or for any other purpose.

F2 · ownership.direct: Mr. Swets serves on the Board of Directors of the Issuer. Mr. Swets holds 16,399 shares of common stock of the Issuer, and Mr. Swets holds 6,401 restricted stock units granted by the Issuer. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock upon vesting.

SEC source: 0001628280-20-013502 · wf-form4_159985672153919.xml · nonDerivative · entry 3

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,661

F3 · price: The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.20 to $7.56, inclusive. The reporting person undertakes 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 within the range set forth in this footnote.

SEC source: 0001628280-20-013502 · wf-form4_159985672153919.xml · nonDerivative · entry 2

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,186

F2 · price: The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.50 to $7.61, inclusive. The reporting person undertakes 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 within the range set forth in this footnote.

SEC source: 0001628280-20-013502 · wf-form4_159985672153919.xml · nonDerivative · entry 1

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,718

F1 · price: The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.10 to $7.61, inclusive. The reporting person undertakes to provide to Limbach Holdings, Inc. (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 within the range set forth in this footnote.

SEC source: 0001628280-20-013344 · wf-form4_159925565944208.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,595

F1 · price: The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $6.53 to $6.62, inclusive. The reporting person undertakes to provide to Limbach Holdings, Inc. (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 within the range set forth in this footnote.

SEC source: 0001628280-20-013346 · wf-form4_159925621749657.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 397,664

F1 · price: The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $6.50 to $6.715, inclusive. The reporting person undertakes to provide to Limbach Holdings, Inc. (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 within the range set forth in this footnote.

SEC source: 0001072627-20-000098 · primary_doc.xml · nonDerivative · entry 2

KINGSWAY FINANCIAL SERVICES INC · CIK 0001072627 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By wholly-owned subsidiary

Disclosed balance after: 255,110

SEC source: 0001072627-20-000098 · primary_doc.xml · nonDerivative · entry 1

KINGSWAY FINANCIAL SERVICES INC · CIK 0001072627 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By wholly-owned subsidiary

Disclosed balance after: 314,050

SEC source: 0001072627-20-000093 · primary_doc.xml · nonDerivative · entry 2

KINGSWAY FINANCIAL SERVICES INC · CIK 0001072627 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By wholly-owned subsidiary

Disclosed balance after: 382,312

SEC source: 0001072627-20-000093 · primary_doc.xml · nonDerivative · entry 1

KINGSWAY FINANCIAL SERVICES INC · CIK 0001072627 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By wholly-owned subsidiary

Disclosed balance after: 449,022

SEC source: 0001072627-20-000088 · primary_doc.xml · nonDerivative · entry 2

KINGSWAY FINANCIAL SERVICES INC · CIK 0001072627 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By wholly-owned subsidiary

Disclosed balance after: 562,913

F1 · ownership.nature: Held by reporting person's wholly-owned subsidiary, Kingsway America Inc.

SEC source: 0001072627-20-000088 · primary_doc.xml · nonDerivative · entry 1

KINGSWAY FINANCIAL SERVICES INC · CIK 0001072627 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By wholly-owned subsidiary

Disclosed balance after: 576,397

F1 · ownership.nature: Held by reporting person's wholly-owned subsidiary, Kingsway America Inc.

SEC source: 0001628280-20-007580 · wf-form4_158931689512838.xml · derivative · entry 1

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,168

Underlying: Common Stock · 7,500 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.

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.

F2 · 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. 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.

F2 · 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. 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: 0001628280-20-004622 · wf-form4_158617738625331.xml · derivative · entry 1

Horowitz Joshua · CIK 0001612424 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,933

Underlying: Common Stock · 2,933 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. common stock, exempt under Rule 16b-3.

F2 · derivative.exercise_date: This award of RSUs was granted on 04/03/2020. The award is subject to service-based vesting conditions and vests 27.241732% on January 1, 2021 and 36.379134% on each of January 1, 2022 and January 1, 2023, subject to continued service through the applicable vesting date.

F2 · derivative.expiration_date: This award of RSUs was granted on 04/03/2020. The award is subject to service-based vesting conditions and vests 27.241732% on January 1, 2021 and 36.379134% on each of January 1, 2022 and January 1, 2023, subject to continued service through the applicable vesting date.

SEC source: 0001446472-20-000002 · primary_doc.xml · nonDerivative · entry 1

Pratt Brian · CIK 0001441252 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,537,800

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.69 and $3.00. The reporting person undertakes to provide Limbach Holdings, Inc., any security holder of Limbach Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (1) of this Form 4.

F2 · balance_after: These shares are held as community property by Brian Pratt and his spouse, Barbara Pratt. Mrs. Pratt's address is the same as Mr. Pratt's address listed above.

SEC source: 0001104659-20-041167 · tm2014309-1_4.xml · derivative · entry 5

Cerminara Kyle · CIK 0001619991 · 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. common stock, exempt under Rule 16b-3.

F5 · derivative.exercise_date: This award of RSUs was granted on 01/01/2020. The Company accelerated vesting of this RSU Award on March 27, 2020 in connection with the Reporting Person's resignation from the Board.

F5 · derivative.expiration_date: This award of RSUs was granted on 01/01/2020. The Company accelerated vesting of this RSU Award on March 27, 2020 in connection with the Reporting Person's resignation from the Board.

SEC source: 0001104659-20-041167 · tm2014309-1_4.xml · derivative · entry 4

Cerminara Kyle · CIK 0001619991 · 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. common stock, exempt under Rule 16b-3.

F4 · derivative.exercise_date: This award of RSUs was granted on 03/26/2019. The Company accelerated vesting of this RSU Award on March 27, 2020 in connection with the Reporting Person's resignation from the Board.

F4 · derivative.expiration_date: This award of RSUs was granted on 03/26/2019. The Company accelerated vesting of this RSU Award on March 27, 2020 in connection with the Reporting Person's resignation from the Board.

SEC source: 0001104659-20-041167 · tm2014309-1_4.xml · nonDerivative · entry 1

Cerminara Kyle · CIK 0001619991 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,400

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. common stock, exempt under Rule 16b-3.

SEC source: 0001446472-20-000001 · primary_doc.xml · nonDerivative · entry 1

Pratt Brian · CIK 0001441252 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,530,000

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.55 and $2.96. The reporting person undertakes to provide Limbach Holdings, Inc., any security holder of Limbach Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (1) of this Form 4.

F2 · balance_after: These shares are held as community property by Brian Pratt and his spouse, Barbara Pratt. Mrs. Pratt's address is the same as Mr. Pratt's address listed above.

SEC source: 0001772220-20-000002 · primary_doc.xml · nonDerivative · entry 3

Pratt Brian · CIK 0001441252 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,500,000

F3 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.60 and $3.80.

F4 · balance_after: These shares are held as community property by Brian Pratt and his spouse, Barbara Pratt. Mrs. Pratt's address is the same as Mr. Pratt's address listed above.

SEC source: 0001772220-20-000002 · primary_doc.xml · nonDerivative · entry 2

Pratt Brian · CIK 0001441252 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,294,814

F2 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.54 and $3.80.

F4 · balance_after: These shares are held as community property by Brian Pratt and his spouse, Barbara Pratt. Mrs. Pratt's address is the same as Mr. Pratt's address listed above.

SEC source: 0001772220-20-000002 · primary_doc.xml · nonDerivative · entry 1

Pratt Brian · CIK 0001441252 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,135,349

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.425 and $3.91. The reporting person undertakes to provide Limbach Holdings, Inc., any security holder of Limbach Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnotes (1), (2) and (3) of this Form 4.

F4 · balance_after: These shares are held as community property by Brian Pratt and his spouse, Barbara Pratt. Mrs. Pratt's address is the same as Mr. Pratt's address listed above.

SEC source: 0001104659-20-000988 · tm1928451-7_4.xml · derivative · entry 9

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,668

Underlying: Common Stock · 10,000 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.

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.

F6 · 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.

F6 · 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: 0001104659-20-000988 · tm1928451-7_4.xml · derivative · entry 8

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,668

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.

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.

F5 · 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.

F5 · 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: 0001104659-20-000988 · tm1928451-7_4.xml · derivative · entry 7

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,668

Underlying: Common Stock · 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.

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.

F4 · 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.

F4 · 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.

SEC source: 0001104659-20-000988 · tm1928451-7_4.xml · derivative · entry 6

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,001

Underlying: Common Stock · 1,333 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.

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.

F3 · derivative.exercise_date: This award of RSUs was granted on 04/13/2018. The award is subject to service-based vesting conditions and vests in equal annual 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 04/13/2018. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2019, January 1, 2020 and January 1, 2021, subject to continued employment through the applicable vesting date.

SEC source: 0001104659-20-000988 · tm1928451-7_4.xml · derivative · entry 5

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,334

Underlying: Common Stock · 834 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.

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.

F2 · derivative.exercise_date: This award of RSUs was granted on 08/30/2017. The award is subject to service-based vesting conditions and vests in equal installments on each of January 1, 2018, January 1, 2019 and January 1, 2020, subject to continued employment through the applicable vesting date.

F2 · derivative.expiration_date: This award of RSUs was granted on 08/30/2017. The award is subject to service-based vesting conditions and vests in equal installments on each of January 1, 2018, January 1, 2019 and January 1, 2020, subject to continued employment through the applicable vesting date.

SEC source: 0001104659-20-000988 · tm1928451-7_4.xml · nonDerivative · entry 4

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,726

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: 0001104659-20-000988 · tm1928451-7_4.xml · nonDerivative · entry 3

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,726

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: 0001104659-20-000988 · tm1928451-7_4.xml · nonDerivative · entry 2

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,393

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: 0001104659-20-000988 · tm1928451-7_4.xml · nonDerivative · entry 1

McCann Michael M · CIK 0001760470 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,060

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: 0001104659-20-000983 · tm1928451d2_4.xml · derivative · entry 7

McNally Michael F · CIK 0001667559 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,401

Underlying: Common Stock · 3,200 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 01/01/2020. 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: 0001104659-20-000983 · tm1928451d2_4.xml · derivative · entry 6

McNally Michael F · CIK 0001667559 · 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 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: 0001104659-20-000983 · tm1928451d2_4.xml · derivative · entry 5

McNally Michael F · CIK 0001667559 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,267

Underlying: Common Stock · 357 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 04/27/2018. 33% of the RSUs vested upon the grant date and the remaining RSUs vest equally on January 1, 2019 and January 1, 2020, subject to continued service through the applicable vesting date.

F3 · derivative.expiration_date: This award of RSUs was granted on 04/27/2018. 33% of the RSUs vested upon the grant date and the remaining RSUs vest equally on January 1, 2019 and January 1, 2020, subject to continued service through the applicable vesting date.

SEC source: 0001104659-20-000983 · tm1928451d2_4.xml · derivative · entry 4

McNally Michael F · CIK 0001667559 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,624

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 04/13/2018. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2019, January 1, 2020 and January 1, 2021, subject to continued service through the applicable vesting date.

F2 · derivative.expiration_date: This award of RSUs was granted on 04/13/2018. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2019, January 1, 2020 and January 1, 2021, subject to continued service through the applicable vesting date.

SEC source: 0001104659-20-000983 · tm1928451d2_4.xml · nonDerivative · entry 3

McNally Michael F · CIK 0001667559 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 39,099

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.

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.