144/A: Filer Information

Filer CIK

0001221430

Filer CCC

XXXXXXXX

Previous Accession Number Of The Filing

0001974078-26-000102

Is this a LIVE or TEST Filing?

LIVE

TEST

Submission Contact Information

Name

Phone

E-Mail Address

144/A: Issuer Information

Name of Issuer

Orion Group Holdings Inc

SEC File Number

001-33891

Address of Issuer

2940 RIVERBY ROAD
SUITE 400
Houston
TEXAS
77020

Phone

713-852-6500

Name of Person for Whose Account the Securities are To Be Sold

SHANFELTER AUSTIN J

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

Director

144/A: Securities Information

Title of the Class of Securities To Be Sold

Name and Address of the Broker

Number of Shares or Other Units To Be Sold

Aggregate Market Value

Number of Shares or Other Units Outstanding

Approximate Date of Sale

Name the Securities Exchange

Common

Raymond James & Associates
880 Carillon Parkway
St. Petersburg � FL � 33716

90000

1060200.00

40083300

03/10/2026

NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144/A: Securities To Be Sold

Title of the Class

Date you Acquired

Nature of Acquisition Transaction

Name of Person from Whom Acquired

Is this a Gift?

Date Donor Acquired

Amount of Securities Acquired

Date of Payment

Nature of Payment *

Common

09/12/2022

Acquired as Compensation - RSU

Issuer

90000

09/12/2022

Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144/A: Securities Sold During The Past 3 Months

Nothing to Report

144/A: Remarks and Signature

Remarks

Date of Notice

03/10/2026

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

Maressia Rooks-Bailey, as duly authorized representative of Raymond James & Associates, Inc., as attorney-in-fact for Austin J. Shanfelter

Amendment: SEC Form 144/A filed by Orion Group Holdings Inc. Common