On July 2, 2013, Foss Marine Holdings announced that (effective at that date) it would merge all of its operations and resources under a single name: 'Foss Maritime Company'.

When Thea Foss died in 1927, the company owned 27 gasoline, diesel, and steam powered vessels, and numerous unpowered barges.

This was a naphtha-fueled vessel that solely operated rafting giant Douglas Fir logs in the sound area.

Foss Maritime developed and built an ASD Z-Drive and Voith Schneider Propulsion cycloidal tractor tugs capable of working with the largest vessels in its operating area.

[8] In 2008, the United States Coast Guard awarded Foss Maritime its most prestigious environmental honor for developing the low-emission, hybrid tugboat Green Dolphin.

Earlier, in June 2008, Foss won the Environmental Protection Agency's Clean Air Excellence Award, also for their green tug.

Recently, the company has been working on bringing a sister ship hybrid tug into the ports of Los Angeles and Long Beach.