UnitedHealth ( UNH) sank 4% early Thursday after the giant health insurer continues to struggle with a stock-option backdating scandal. The Minnetonka, Minn., company posted generally in-line fourth-quarter numbers but said an earnings restatement would limit the amount of financial data it could share. The news comes after a year that saw the company's longtime CEO, William McGuire, forced out by revelations that he oversaw a program that gave workers stock options at favorable terms while neglecting to properly account for those perks. The company made $1.2 billion in the quarter ended Dec. 31 on revenue of $18.16 billion but said it couldn't offer year-to-year comparisons or per-share numbers as it grapples with its stock-option accounting. Using numbers the company furnished, though, it appears UnitedHealth made 86 cents a share for the quarter, a penny ahead of the Wall Street estimate. Looking ahead, the company expects to follow through on its promise to deliver profits of $4.7 billion to $4.75 billion for the entire year. Sheryl Skolnick, senior vice president of CRT Capital Group, likes what she sees. The results were "very solid, very much in line," Skolnick says. "The trends were good. They were what they should have been." A $50 million charge for stock-option expenses did hurt the bottom line, however. The company's review of past option grants, which could bring massive restatements, is ongoing. Shares were falling $2.08 to $53.57.