They were open about their gains. It was the margin calls and illiquidity that got them, not going negative. Some of their assets, like Anthropic stock, isn’t worthless, it’s just illiquid.
WSJ earlier reported that SA had a deal Wednesday night to sell their Anthropic stake to Citadel for $10B in cash but on Thursday morning backed out and decided to instead sell public equitities in their portfolio at what was reported as "a more than 10% discount."