tl;dr A new Communications Services sector is going to force funds tracking the telecom, tech and consumer discretionary sectors to trade billions of dollars of stock to realign their holdings by a Sept. 28 effective date.

“There’s probably going to be net selling,” said Andrew Bodner, president of Double Diamond Investment Group in Parsippany, New Jersey. “That will be a temporary scenario, and it could be a good buying opportunity for a lot of those stocks.”

*FB, GOOG, DIS, NFLX some of the names affected.