E*Trade is considering telling meme-stock leader Keith Gill he can no longer use its platform after growing concerned about potential stock manipulation around his recent purchases of GameStop options, according to people familiar with the matter.

Shortly before Gill reignited a meme-stock craze in May, he bought a large volume of GameStop options on E*Trade, the people said. This week, Gill posted screenshots of an E*Trade account showing he owns GameStop shares now valued at $140m and a new set of options that expire later this month. His total gains on the positions were at $85.5m, he posted late 3 June, showing his account remained in operation.