In This Story UNH NWSA HSBC Someone might want to check UnitedHealth’s ( UNH ) vitals. The U.S.’s largest health insurer is taking hits from all sides — its stock is sliding, the Department of Justice is circling, and an investigation just accused it of secretly paying nursing homes to keep patients from going to the hospital. Suggested Reading JPMorgan Chase is getting into the business of geopolitics America's air traffic control system is 'wildly out of date' and 'failing,' airline CEOs tell