TLDR
AUM shifts this week were driven by Fidelitys FBTC on the key inflow day, while net outflows were led by BlackRocks IBIT, Bitwises BITB, and Arks ARKB per recent flow breakdowns a market update.
- Five trading days saw net outflows totaling $825.7M, except for one inflow day midweek a Cointelegraph report.
- On 18 Dec, FBTC took $391.5M and IBIT $111.2M in inflows, the strongest day since 11 Nov a Yahoo Finance update.
- Weekly drivers: IBIT -$240.3M, BITB -$115.1M, ARKB -$100.7M, versus FBTC +$33.1M the breakdown above.
Deep Dive
1. Weekly AUM Direction
The US spot Bitcoin ETF complex showed persistent net outflows over the last five trading days, totaling $825.7M, with only Wednesday showing positive net flows a Cointelegraph report.
Two additional daily snapshots corroborate the pressure, including a -$142.2M net-flow day and cumulative holdings context for the sector a Coindesk daybook.
The weeks AUM decline was the product of broad net outflows, punctuated by one strong inflow day that did not fully offset prior selling.
2. Inflow Day Leadership
On 18 Dec, inflows concentrated in Fidelitys FBTC ($391.5M) and BlackRocks IBIT ($111.2M), marking the strongest single-day net inflow since 11 Nov and highlighting adviser demand into the largest funds a Yahoo Finance update.
This aligns with recent patterns where the largest issuers often dominate positive flow windows, even amid a weak week for net flows overall the report above.
When flows turn positive, leadership usually concentrates in FBTC and IBIT, which can swing aggregate AUM quickly.
3. Outflow Concentration
For the weeks net outflows, IBIT (-$240.3M), BITB (-$115.1M), and ARKB (-$100.7M) were the primary sources of AUM decline, while FBTC was a mild offset at +$33.1M a market update.
Smaller outflows also appeared in GBTC (-$27.5M) and HODL (-$39.2M) on the week, consistent with broad pressure across issuers the breakdown above.
The AUM drop was not isolated to a single ETF; multiple large funds contributed, with IBIT, BITB, and ARKB carrying most of the outflow load.
Conclusion
AUM changes this week were shaped by one standout inflow session led by FBTC and several outflow-heavy days dominated by IBIT, BITB, and ARKB. Watching IBIT and FBTC gives the best early signal of aggregate AUM direction because these funds concentrate the largest swings in daily flows.
Confidence: moderate due to mixed daily flow tallies across sources. A fast verification step is to cross-check issuer flow dashboards and the next official end-of-day flow recap on the pages above.
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