Tidewater chief executive John Rynd is retiring.

The New York-traded offshore giant announced the move after the close of trading Wednesday, effective immediately. He will be replaced by Quintin Kneen, the company's current chief financial officer.

Rynd took over the top spot at Houston-based Tidewater in February 2018, seven months after the company emerged from bankruptcy.

Rynd then guided Tidewater through its merger with GulfMark, creating the world's largest offshore fleet in a deal that closed that November and valued GulfMark at $900m.

Until that point, Kneen had served as GulfMark's chief executive for the previous five years. He joined the company in 2008 from Giant Prideco.