$433M Bitcoin ETF Surge From Friday Leaves Funds With Slim $6.2M Weekly Inflow

US spot bitcoin exchange-traded products (ETPs) closed the week of September 14–18, 2026, barely in positive territory after a late surge in demand. Data compiled by SoSoValue showed that investors allocated $433 million to these listed bitcoin funds on Friday, September 18, 2026.

That single session was large enough to offset earlier withdrawals and leave the group with a net weekly inflow of about $6.2 million.

The week was anything but quiet. Monday opened with roughly $160 million in creations. Tuesday and Wednesday then reversed course, with combined redemptions near $746 million.

Thursday brought a partial recovery of about $159.5 million, leaving the products still deeply negative heading into the final session.

Friday’s $433 million intake—the strongest daily figure since September 3—closed most of that gap and produced the slim weekly surplus.

Fidelity’s Wise Origin Bitcoin Fund, ticker FBTC, dominated the Friday rebound.

It accounted for approximately $310.7 million, or more than 70 percent of the day’s net creations.

BlackRock’s iShares Bitcoin Trust (IBIT) followed with about $108.4 million.

Together the two vehicles supplied nearly 97 percent of Friday’s inflow.

Smaller products from Bitwise, VanEck, and ARK 21Shares posted modest positive flows, while several other funds were essentially flat.