Sec Form 4 Filing - Horowitz Joshua @ Limbach Holdings, Inc. - 2021-06-21

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Horowitz Joshua 2. Issuer Name and Ticker or Trading Symbol Limbach Holdings, Inc. [ LMB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O PALM MANAGEMENT (US) LLC, 19 WEST ELM STREET 3. Date of Earliest Transaction (MM/DD/YY) 06/21/2021 (Street) GREENWICH, CT06830 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 06/21/2021 P 1,507 A $ 9.2027 ( 2 ) 179,889 ( 1 ) I By Palm Global Small Cap Master Fund LP Common Stock 06/22/2021 P 5,000 A $ 9.0446 ( 3 ) 184,889 ( 1 ) I By Palm Global Small Cap Master Fund LP Common Stock 16,799 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Units ( 4 ) ( 4 ) ( 4 ) Common Stock 2,134 2,134 D Restricted Stock Units ( 5 ) ( 5 ) ( 5 ) Common Stock 3,200 3,200 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Horowitz Joshua C/O PALM MANAGEMENT (US) LLC 19 WEST ELM STREET GREENWICH, CT06830 X Palm Management (US) LLC C/O PALM MANAGEMENT (US) LLC 19 WEST ELM STREET GREENWICH, CT06830 X Palm Global Small Cap Master Fund LP C/O PALM MANAGEMENT (US) LLC 19 WEST ELM STREET GREENWICH, CT06830 X Palmer Bradley C C/O PALM MANAGEMENT (US) LLC 19 WEST ELM STREET GREENWICH, CT06830 Director by Deputization Signatures /s/ Joshua S. Horowitz 06/22/2021 Signature of Reporting Person Date PALM MANAGEMENT (US) LLC, /s/ Joshua S. Horowitz, Portfolio Manager 06/22/2021 Signature of Reporting Person Date PALM GLOBAL SMALL CAP MASTER FUND LP, by Palm Global Small Cap Fund GP, Ltd., its general partner, /s/ Joshua S. Horowitz, Director 06/22/2021 Signature of Reporting Person Date /s/ Bradley C. Palmer 06/22/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )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. ( 2 )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. ( 3 )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. ( 4 )Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Company's common stock. This award of RSUs was granted on April 3, 2020. The award is subject to service-based vesting conditions and vests 36.379134% on each of January 1, 2022 and January 1, 2023, subject to continued service through the applicable vesting date. ( 5 )Each RSU represents a contingent right to receive one share of the Company's common stock. This award of RSUs was granted on January 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.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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