Also on Friday, GameStop said it would sell up to 75 million shares, days after it made $933 million by selling 45 million shares.
Gill acquired 5 million shares of GameStop at an average price of $21.274, according to details he shared on social media. In addition, he bought 120,000 GameStop June 21 call options at a strike price of $20 at $5.6754 per contract. Reuters was unable to verify the size and value of his holdings.
On Monday afternoon, the options contracts were changing hands at $6.40 a contract, according to LSEG data.
Other so-called meme stocks also gave back recent gains on Monday, with AMC Entertainment losing nearly 7% and headphone seller Koss down about 4%.