Grayscale’s Bitcoin Trust (GBTC) recorded $44.1 million in net outflows on Tuesday, September 15. Total U.S. spot Bitcoin ETFs saw combined withdrawals of approximately $450.4 million. This represents the largest single-day outflow for the sector since June 2026.

Investors reacted to the U.S. Senate's failure to advance the Digital Asset Market CLARITY Act. This legislative setback introduced new uncertainty into the digital asset regulatory landscape. The news triggered a risk-off sentiment across the market.

Fidelity’s FBTC and BlackRock’s IBIT recorded the largest redemptions. Widespread outflows across multiple funds, including GBTC, indicate a collective cautious sentiment. This event reversed modest inflows from the previous day and underscored market sensitivity to regulatory developments.