A Question on CitiCorp

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I have a question I'd like to ask Slopers: is the purported market capitalization of CitiCorp correct?

If you look at the Yahoo Finance site, it states that their market cap is about $127 billion. Since their stock is about $4.38, and the price of C in late 2006 was $51.54, that would imply their market cap was $1.5 trillion back then.

Since this simply cannot be the case, what's going on with these figures? I never trade C, but I am merely curious.

0323-c