SBF invested approximately $500 million to $580 million in Antropic's Series B round in early 2022, before the AI ​​craze took hold, securing an approximately 8% stake. As a result, this stake became the company's most valuable asset following the FTX bankruptcy. In March 2024, the bankruptcy trustee sold approximately two-thirds of the stake for approximately $884 million, and subsequently secured a total cash proceeds of over $1.3 billion through additional sales. With Antropic's enterprise value recently estimated at over $180 billion (2025-2026), some analysts estimate that if the company had retained its stake, its value would have exceeded $14 billion (approximately 18 trillion won). SBF acquired approximately 7.6% of Robinhood through a company called Emergent Fidelity. This stake was seized during bankruptcy proceedings and was ultimately liquidated in 2024 when Robinhood repurchased its own shares for approximately $600 million. SBF's X account is not operated directly by the individual, but rather by an acquaintance or proxy who posts on his behalf. The account operator has stated, "I am a friend of SBF and am posting on his behalf." x.com/i/status/197068083562482...… Because US federal prison regulations strictly prohibit inmates from possessing smartphones or directly using the internet or social media, SBF is known to relay messages from within the prison to acquaintances or attorneys, who then upload these messages to social media formats.