Hercules Offshore Inc., a drilling and liftboat service company for the energy industry, on March 27 filed with U.S. regulators for an offering of $8 million shares of its common stock. The Houston company said in a filing with the Securities and Exchange Commission that it would sell $1.6 million shares, and stockholders would sell $6.4 million. Credit Suisse and Citigroup are underwriting the offering.