I have no idea if this is true but: Surprise!:

“A big mystery seller of futures contracts during the market meltdown last week was not a hedge fund or a high frequency trader as many have suspected, but money manager Waddell & Reed Financial Inc, according to a document obtained by Reuters.

Waddell sold on May 6 a large order of e-mini contracts during a 20-minute span in which U.S. equity markets plunged, briefly wiping out nearly $1 trillion in market capital, the internal document from CME Group Inc said.

Regulators and exchange officials quickly focused on Waddell’s sale of 75,000 e-mini contracts, which the document said “superficially appeared to be anomalous activity.”

The CME document shows that during the sell-off and subsequent rally, other active traders in e-minis included Jump Trading, Goldman Sachs, Interactive Brokers, JPMorgan Chase and Citadel Group.

During the 20-minute period, 842,514 contracts in e-minis were traded while Waddell from 2 p.m. to 3 p.m. traded its contracts, CME said. The CME document did not provide a break-out of Waddell’s trading during the crucial 20 minutes.