US Spot Bitcoin ETFs Pull In $2.4B in Their Strongest Week Since October 2025

According to The Block's analysis of SoSoValue data, U.S. spot bitcoin ETFs drew $2.4 billion in net inflows in the week ending September 25, 2026, their largest weekly gain since October 2025. The result returned the funds to positive territory for 2026, at about $934.1 million in the green. The last larger weekly intake came in the week ending October 10, 2025, when the funds recorded $2.7 billion of inflows; the latest total was concentrated heavily at the start of the five-trading-day period rather than spread evenly across the days.

Data Snapshot

MetricCurrentPreviousChangePeriodAs ofSourceU.S. spot bitcoin ETF net inflows$2.4 billion——week ending September 25, 20262026-09-25The BlockMonday net inflows$999.0 million——Monday, September 21, 20262026-09-21The BlockTuesday net inflows$714.7 million——Tuesday, September 22, 20262026-09-22The BlockWednesday net inflows$347.0 million——Wednesday, September 23, 20262026-09-23The BlockThursday net inflows$190.6 million——Thursday, September 24, 20262026-09-24The BlockFriday net inflows$134.5 million——Friday, September 25, 20262026-09-25The Block

September 21–25 inflows were front-loaded

Monday, September 21 accounted for $999.0 million of net inflows, the largest daily reading since October 6, 2025. That opening-day figure set the pace for the week and was followed by a smaller, though still substantial, $714.7 million on Tuesday, September 22.

Net inflows then eased to $347.0 million on Wednesday, September 23, before falling to $190.6 million on Thursday, September 24. Friday, September 25 brought a further $134.5 million, extending the funds' positive run to seven straight days.

Each day from Monday through Friday remained positive, but the descending sequence shows how heavily the $2.4 billion weekly result relied on Monday’s exceptional intake. The daily figures are net flow readings—money entering and leaving the funds over a period—not the value of their holdings.

Bitcoin ETF inflows news graphic. — Source: The Block

The $2.4 billion week reversed ETFs’ 2026 flow position

The week ending September 25 was the strongest for U.S. spot bitcoin ETFs since October 2025. It was surpassed only by the $2.7 billion recorded in the week ending October 10, 2025, based on the comparison reported by The Block.

The $2.4 billion addition also left the products about $934.1 million positive for 2026. That year-to-date position reflects cumulative net flows during 2026, while the weekly figure captures activity only for the period ending September 25.

Cumulative net inflows reached $57.6 billion

Cumulative net inflows since launch stood at $57.6 billion as of Friday, September 25, 2026. Net assets across the funds totaled $108.4 billion on the same date.

The two measures are not interchangeable: cumulative net inflows track net investor subscriptions since launch, whereas net assets represent the value held by the funds at a given time. The reported asset total therefore provides a current balance-sheet snapshot alongside the longer-run flow figure.

Disclaimer: This article is provided for informational purposes only. It is not offered or intended to be used as legal, tax, investment, financial, or other advice.