While Griffin said, "I want to be perfectly clear: we had no role in Robinhood's decision to limit trading in GameStop or any other of the 'meme' stocks." Meme stocks are a reference to stocks popular among retail traders such as GameStop and AMC Entertainment Holdings Inc AMC. Melvin Capital, a short seller that got squeezed by retail investors on r/WallStreetBets, was provided with liquidity worth $2 billion by Citadel Securities in January.