Friday is going to be a huge day for stock traders

An Instagram banner hangs below American flags flying outside of the New York Stock Exchange in New York on Sept. 14, 2018. Foto: Bloomberg photo by Michael Nagle.

Buckle up, traders. Two major market events that have the potential to send U.S. equity volumes sky-high will collide Friday.

The first is the quarterly event known as "quadruple witching" -- when futures and options on indexes and individual stocks expire. That generally results in some of the biggest trading days of the year. But tomorrow brings a wild card -- the largest revision to the Global Industry Classification Standard since 1999...

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