FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF 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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(Print or Type Responses)

1. Name and Address of Reporting Person *   Tabb Robert L 2. Date of Event Requiring Statement (Month/Day/Year) 03/28/2019 3. Issuer Name and Ticker or Trading Symbol Orion Group Holdings Inc [ORN] (Last) (First) (Middle) 12000 AEROSPACE AVENUE, SUITE 300 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) VP and Chief Financial Officer 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) HOUSTON, TX 77034 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 Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock 1,405 (1) D   Common Stock 2,116 (2) D   Common Stock 3,351 (3) D Â

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Common stock options	  (4)	05/19/2026	Common stock	4,158	$ 4.94	D	Â
Common stock options	  (5)	05/25/2027	Common stock	6,261	$ 7.22	D	Â
Common stock options	  (6)	05/24/2028	Common stock	8,993	$ 7.46	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Tabb Robert L 12000 AEROSPACE AVENUE SUITE 300 HOUSTON, TX 77034	Â	Â	  VP and Chief Financial Officer	Â

Signatures

Robert L. Tabb		04/05/2019
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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 19, 2017) and 1/36 per month thereafter such that all shares are vested on the third anniversary of the stock grant.
(2)	This grant of restricted stock vests cumulatively at a rate of 1/3 upon the first anniversary of the stock grant (May 25, 2018) and 1/36 per month thereafter such that all shares are vested on the third anniversary of the stock grant.
(3)	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.
(4)	The stock option grant is exercisable cumulatively at a rate of 1/3 upon the first anniversary of the stock option grant (May 19, 2017) and 1/36 per month thereafter such that all option shares are exercisable on the third anniversary of the stock option grant.
(5)	The stock option grant is exercisable cumulatively at a rate of 1/3 upon the first anniversary of the stock option grant (May 25, 2018) and 1/36 per month thereafter such that all option shares are exercisable on the third anniversary of the stock option grant.
(6)	The 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.

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