LIST OF CORPORATE ENTITIES (UPDATED 12/31/25)

Artemis Business Solutions, LLC

Commercial Channel & Dock Company

Dragados/Hawaiian Dredging/Orion JV

East & West Jones Placement Areas, LLC

Industrial Channel & Dock Company

King Fisher Marine Services, LLC

Misener Marine Construction, Inc.

Northwest Marine Construction, ULC

OM Marine Services de Mexico (S de R.L. de C.V.)

Orion Administrative Services, Inc.

Orion Concrete Construction, LLC

Orion Construction, LLC

Orion Corporate Services, LLC

Orion Government Services, LLC

Orion Industrial Construction, LLC

Orion Marine Construction Bahamas, LLC

Orion Marine Construction TCI, Ltd

Orion Marine Construction, Inc.

Orion Marine Contractors, Inc.

Orion Marine de Mexico (S de R.L. de C.V.)

Orion Marine Group, LLC

Preferred Tool Services, Inc.

Schneider E&C Company, Inc.

SSL South, LLC

T. LaQuay Dredging, LLC

T.A.S. Commercial Concrete Solutions, LLC

T.A.S. Proco, LLC

TAS Concrete Construction, LLC

Tony Bagliore Concrete, Inc. dba T.A.S. Commercial Concrete CTX