The company was listed on Oslo Stock Exchange with the tickers FOE and later DDASA.

In 1998, its remotely operated vehicle division was sold to Stolt Comex Seaways (now Subsea 7).

The main shareholders that time were the companies Bonheur and Ganger Rolf ASA, controlled by the Olsen family.

A debt investor SVP Global acquired more than 90% of the company's debts and transferred its operating subsidiaries to a new Jersey-registered holding company, Dolphin Drilling Holdings Limited.

[4] In May 2022, it was announced that Cyprus-headquartered oilfield services company, SD Standard ETC had acquired a 25% stake in Dolphin Drilling, as part of a $10 million USD deal.