The US Treasury has announced it will scrutinize hedge fund strategies designed to reduce clients' tax liabilities, signaling a tougher stance on aggressive tax planning. This development comes as "tax alpha" strategies, which leverage and algorithmic trading to realize losses for tax offsets, have seen a surge in popularity.

More than $90 billion reportedly flowed into these strategies between early 2025 and April, attracting attention from firms like AQR and Quantinno. The Treasury is concerned these practices could be diminishing government tax revenue. Kevin Salinger of the Treasury warned investors to be wary of deals that seem "too good to be true."

Shares of Affiliated Managers Group (AMG), which holds a stake in AQR, dropped 7 percent following the announcement. While the Treasury has not yet outlined specific new regulations, it indicated a "serious dialogue with the market" will precede any definitive actions, aiming to address concerns without immediately stifling innovation.