No... http://www.zerohedge.com/news/2013-04-11/winklevoss-twins-revealed-owning-1-all-bitcoins
The brothers began dabbling in bitcoin last summer when the dollar value of a single coin was still in the single digits. In addition to the purchase of bitcoins, they also say they have invested in a bitcoin-related company, but declined to disclose which one. The currency itself exists as a string of letters and numbers. In order to keep their holdings secure from hackers, they have taken those codes off networked computers and saved them on small flash drives. They said they have put the drives in safe deposit boxes at banks in three different cities.

So they bought for single digits a year ago, and now hold those coins in cold storage and do not trade them

Just because some trolling teens shout that they caused the crash, were the ones buying/selling doesn't make it true. Look at all the replies here, all of those above are just guys inventing something the moment they type, and then passing it off as fact.