This Grok portfolio just destroyed the S&P 500

An experimental AI-managed stock portfolio run by Grok has significantly outperformed the S&P 500, rising from $100,000 to $148,485 in under nine months versus $114,101 for the benchmark. The portfolio returned 48.48% since late November 2025, beating the index by 34.38 percentage points. Performance accelerated in April and May, with the account briefly exceeding $150,000 in late May before a period of volatility. Risk-adjusted performance was strong, with a Sharpe ratio of 2.19 and maximum drawdown of 13.5%. The gains were driven largely by concentrated exposure to Micron, whose rally on AI infrastructure demand helped power returns. However, the heavy concentration in a few stocks means future performance remains highly dependent on continued strength in those names and the broader AI trade.