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 OF SECURITIES 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 * Buchler Peter R.   2. Issuer Name and Ticker or Trading Symbol Orion Group Holdings Inc [ORN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) __X__ Other (specify below) Executive Vice President / Genl Counsel & Secretary (Last) (First) (Middle) 12000 AEROSPACE DR. SUITE 300 3. Date of Earliest Transaction (Month/Day/Year) 05/24/2018 (Street) HOUSTON, TX 77034 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 05/24/2018   A   23,458 A (1) 138,927 D   Common Stock 05/24/2018   A   11,729 A (3) 150,656 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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

Common stock options

$ 7.46

05/24/2018

A

31,475

(2)

05/24/2028

Common stock

31,475

$ 0

201,403

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Buchler Peter R. 12000 AEROSPACE DR. SUITE 300 HOUSTON, TX 77034			Executive Vice President	Genl Counsel & Secretary

Signatures

Peter R. Buchler		05/29/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	This grant of restricted stock vests cumulatively at a rate of 1/3 upon the first anniversary of the stock grant (May 24, 2019) and 1/36 per month thereafter such that all shares are vested on the third anniversary of the stock grant.
(2)	This stock option grant is exercisable cumulatively at a rate of 1/3 upon the first anniversary of the stock option grant (May 24, 2019) and 1/36 per month thereafter such that all option shares are exercisable on the third anniversary of the stock option grant.
(3)	This grant of restricted stock vests entirely on third anniversary (May 24, 2021) if performance metrics are met.

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