Five years ago, Keith Gill publicly disclosed his $53,000 investment in GameStop (GME.US). This week, Gill's net worth has exceeded $289 million. According to the Wise Finance APP, this retail investor influencer can impact stock trends by posting mysterious information online. On Monday night, he shared a screenshot of his investment portfolio, showing that even after a 21% increase, he still holds 5 million shares of GameStop stock and 120,000 call options. Just on Monday alone, his paper profit reached as high as $79 million. Gill's username on Reddit is "DeepF------Value," and on YouTube and X, it is "Roaring Kitty." He began sharing his investment in GameStop in September 2019 with a $53,000 position, motivating a group of retail traders to squeeze hedge funds that were shorting the stock. When this astonishing event ended in April 2021, Gill exercised his call options and acquired 200,000 common shares. When he reappeared online three years later, his position size had significantly increased. Meanwhile, GameStop is still striving to transition from physical video game sales to e-commerce, which was initially seen by Gill as a value investment. Michael Khouw, co-founder and chief strategist of OpenInterest.PRO, said, "The most successful traders are those who think outside the box. To trade like that, you have to be different." Khouw added, "You will never see professional traders making those kinds of numbers. Our risk managers would have intervened long before things got to that point. It's unimaginable." However, Gill may run into some trouble. According to foreign media reports, Morgan Stanley's E-Trade brokerage is considering kicking him off the platform due to concerns that his actions may constitute market manipulation. What's next? Gill's latest investment portfolio screenshot shows that he holds 120,000 call options for GameStop with a strike price of $20, expiring on June 21. In other words, if the stock closes above $20 on that day, Gill can exercise them at $20 per share, acquiring an additional 12 million shares. This would bring his total holdings to 17 million shares, making him GameStop's fourth-largest shareholder, behind only Vanguard, BlackRock, and Ryan Cohen's RC Ventures, according to FactSet data. If exercised, the nominal value of these shares would be $240 million. CC Lagator, co-founder of Options AI, said, "Unless you have the money to hold the stock after exercising, you are just temporarily holding these options, intending to sell before expiration. The problem with holding such a large position is that other market participants will clearly see these options or related stocks being sold, putting significant pressure on the stock." " $1 Billion? If Gill exercises, he will hold 17 million shares. Based on Monday's closing price of $28, these shares are worth $476 million. At the recent high of $64.83 on GameStop (May 14), these shares were worth $1.1 billion. (His cost basis for acquiring the shares in this manner was $421.4 million) Gill could also roll these call options out to further expiration dates to buy time, meaning exiting the current position and immediately entering a similar one. However, this could be an expensive choice. Lagator said, "The problem is that every time he does this, he wastes money on the new option premium." On Tuesday, GameStop's stock price fell by 5.36% to $26.5