Published: Thursday, 21 Jun 2012 | 5:54 PM ET

Moody’s Investors Service downgraded the debt ratings of 15 major international banks and securities firms on Thursday, a move that could cost the banks billions of dollars in extra collateral.

U.S banks that were downgraded included:

Bank of America [BAC  7.82    -0.32  (-3.93%)   ],whose long-term debt rating was cut one notch, to BAA2 from BAA1,

Citigroup [C  27.83    -1.03  (-3.57%)   ]which was cut two notches, to BAA2 from A3,

Goldman Sachs [GS  93.90    -2.65  (-2.74%)   ], cut by two notches, to A3 from A1,

JPMorgan [JPM  35.51    -0.94  (-2.58%)   ], cut by two notches, to AA3 from A2

and Morgan Stanley [MS  13.96    -0.24  (-1.69%)   ], also cut by two notches, to BAA1 from A2.

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