Check out which companies are making headlines after-the-bell Thursday:

Moody's announced it downgraded 16 Spanish banks in addition to UK's Santander . The ratings agency said the downgrades are due to adverse operating conditions amid Spain's renewed recession and unfavorable economic environment.

U.S.-listed shares of European banks including Barclays and Deutsche Bank were trading lower. Meanwhile, large U.S. financials including JPMorgan , Citigroup and Morgan Stanley were trading mixed. (Click here for after-hours quotes.)

Facebook priced its historic IPO at $38 a share , at at the high end of the expected range of $34-$38, becoming the largest internet IPO in history. Facebook is set to begin trading Friday at around 11 am ET on the Nasdaq under the ticker “FB.” Other social network companies including Zynga , LinkedIn and Renren were trading mixed. (Click here for after-hours quotes.)

Boston Scientific - The medical device maker announced it received FDA approval and U.S. launch of its Epic Vascular stent, which is designed to open blocked arteries in patients with iliac artery stenosis. The stock jumped in extended-hours trading. (Click here for after-hours quotes.)

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