Mortgage giant

Fannie Mae

( FNM) shot higher after a

Bloomberg

report quoted former Sen. Warren Rudman, who's leading an investigation of the company's financial situation, as saying no new accounting errors have been found.

Rudman later indicated to the

Associated Press

that he disputed some of what appeared in the

Bloomberg

report, but Fannie Mae's shares still gained $4.09, or 8.4%, to $52.84.

IntercontinentalExchange

(ICE) - Get Report

saw its shares jump after the company reported its eighth consecutive record volume year in its futures business.

The company also posted substantial growth in monthly trading volume and commissions in both its futures and over-the-counter operations. For example, Intercontinental had a nearly 80% gain in over-the-counter activity in December. Shares of IntercontinentalExchange rose 5.5% to $38.92.

Shares of

US Bancorp

(USB) - Get Report

added nearly 1% after the Minneapolis-based bank said its U.S. Bank Voyager Fleet Systems had acquired Advent Business Systems of San Mateo, Calif., for an undisclosed amount. US Bancorp was up 21 cents, or 0.7%, to $30.60.

Shares of

Knight Capital

(NITE)

slipped after Lehman Brothers lowered its fourth-quarter profit estimate on the market maker to 11 cents from 18 cents a share. However, Lehman did affirm its overweight rating and $13 price target on the stock. Knight's shares fell 17 cents, or 1.8%, to $9.10.