Health care stocks mostly declined in Tuesday morning trading, with insurers taking some of the biggest losses.

Shares of health care providers and service companies were mixed Monday, with several insurers losing ground, while the broader market posted solid gains.

Semiconductor maker Marvell Technology Group Ltd. on Thursday agreed to pay a $10 million civil fine to settle regulators' allegations of improper backdating of stock options.

Omnicare Inc., which dispenses drugs to nursing homes and other long-term care facilities, said Thursday its first-quarter profit fell year-over-year due to increased enrollment in Medicare Part D prescription benefit programs, but results widely beat Wall Street expectations.

Hospital operator Tenet Healthcare Corp., trying to turn around after years of battling financial and legal troubles, lost $31 million in the first quarter but showed it may be reversing a long slide in patient admissions.

America's Health Insurance Plans, the trade group that represents the health insurance industry, spent $1.8 million lobbying the federal government in the first quarter.

Shares of health care providers and service companies are wavering in afternoon trading after the Federal Reserve lowered two key interest rates by one-fourth of a point.

The executive vice president of human capital for health insurer UnitedHealth Group Inc. bought 3,000 shares of stock, according to a Securities and Exchange Commission filing Tuesday.

Shares of Health Net Inc. managed to gain ground Wednesday as analysts said the health insurer's revised outlook was mostly to be expected and highlighted the company's takeover possibilities.

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A profit warning from WellPoint suggests that U.S. health insurers may not be a safe bet for investors to put their money in a troubled economy.

Insurer UnitedHealth Group won U.S. antitrust approval on Monday to buy Sierra Health Services, despite criticism of the deal.

New York Attorney General Andrew Cuomo on Wednesday said he will sue Ingenix, its parent UnitedHealth Group and three subsidiaries, saying the insurers are defrauding consumers by manipulating how much doctors and hospitals are reimbursed.

The New York Attorney General's Office said it plans to file suit against Ingenix, its parent UnitedHealth Group, and three additional subsidiaries, as part of an investigation into a "scheme by health insurers to defraud consumers by manipulating reimbursement rates."

UnitedHealthsaid on Tuesday that fourth-quarter earnings rose 3 percent, in line with Wall Street's target, helped by improved performance in its Medicaid plans for low-income Americans.