This one had to do with federal allegations that the banking giant failed to disclose its holdings of subprime mortgage investments. The accusations differ from the Goldman Sachs charges because the SEC is saying that Citigroup misled its own shareholders. Goldman, say the feds, misled its customers. From the NYT:

In an unusual move, the Securities and Exchange Commission has also singled out two Citigroup executives -- Gary L. Crittenden, the former chief financial officer, and Arthur Tildesley, the former head of investor relations -- for omitting material information in disclosures to shareholders, according to the two people briefed on the deal. Mr. Crittenden has agreed to pay a $100,000 fine; Mr. Tildesley will pay $80,000.