Billionaire Ken Griffin’s electronic trading firm, Citadel Securities, is under fire again over its role in the January trading frenzy in shares of GameStop after new information surfaced in a lawsuit.

Citadel Securities in a statement on 28 September rejected “Internet conspiracies and Twitter mobs” that have again accused the firm of pushing Robinhood Markets and other brokerages to limit trading in GameStop and other meme stocks on 28 January, a move that resulted in losses for many small investors.