UBS and Citigroup lost $50m due to Nasdaq's Facebook glitches

The banks' exposure lifts the estimated financial hit from Facebook among brokers to more than $100m

The market making arms of UBS and Citigroup suffered combined losses of about $50m on trades made during last Friday's glitch-plagued listing of Facebook on the Nasdaq Stock Market, according to persons familiar with the matter.

Citigroup's losses stemming from the problematic debut of Facebook's stock were about $20m, while UBS lost an approximate $30m, according to people familiar with the matter.

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