Today's Financial Stock Winners and Losers

CBOT Holdings (BOT Quote) slipped after the Chicago Board of Trade and the New York Board of Trade said they signed a nonbinding letter of intent to host the New York board's financial products on the CBOT's electronic-trading platform.

The CBOT will also host the Asian-based commodity contracts to be listed on the Joint Asian Derivatives Exchange. Shares of CBOT Holdings fell $2.58, or 2.7%, to $92.70.

Euronet Worldwide (EEFT Quote) advanced on news the Leawood, Kan., electronic-payments provider has entered the Chinese market with an ATM outsourcing agreement with the Postal Savings and Remittance Bureau, the fifth-largest financial institution in China.

Euronet also said it set-up a joint venture in China, Euronet China. Shares of Euronet Worldwide gained $1.10, or 3.6%, to $31.45.

Ambac Financial Group (ABK Quote) rose after the New York-based financial services company beat analysts' fourth-quarter earnings estimates. The company posted earnings of $204.3 million, or $1.90 a share, up from $188.8 million, or $1.69 a share, a year ago.

Analysts polled by Thomson First Call expected the company to report earnings of $1.71 a share. Shares of Ambac Financial rose $2, or 2.7%, to $76.34.

Shares of Affiliated Managers Group(AMG Quote) were higher after the Massachusetts-based asset management company beat analysts' fourth-quarter earnings expectations. The company reported net income of $38.8 million, or 90 cents a share, up from $23.3 million, or 58 cents a share, a year ago.

The company posted cash earnings of $1.42 a share, up from $1.09 last year. Analysts were looking for earnings of $1.29 a share. Revenue rose 48% to $272.5 million. Affiliated Managers Group was up $6.32, or 7.3%, to $93.02.