Blackstone Group’s (NYSE:BX) private equity fund for wealthy investors posted its strongest monthly performance on record in May, fueled largely by its investment in artificial intelligence startup Anthropic.

Blackstone Private Equity Strategies Class I (BXPE) returned 4.3% net in May, lifting its year-to-date gain to 11.4%, according to a Bloomberg report citing an investor letter. Since launching in 2024, the fund has returned 19.1% net, including a 20% gain last year.

BXPE can invest up to roughly 30% of its net asset value in standalone investments outside Blackstone’s institutional strategies, giving it flexibility to back high-growth areas such as AI and other longer-duration assets that are better suited to perpetual investment vehicles.

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