Citigroup Inc. (NYSE:C) experienced a surge of unusual options activity during the Friday, Aug. 21, session, capped off by a massive $223 million block trade executed after hours.

Massive After-Hours Block Trade

According to Benzinga Pro, on Friday at 04:56 p.m. ET, market data captured a massive order for Citigroup shares.

The block trade comprising 1.7 million shares was priced directly above the asking price of $131.62 apiece at $131.65 per share, resulting in an aggregate transaction value of roughly $223.8 million.

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