TLDR
Over the past week, the biggest BTC ETF inflows went to Fidelity Wise Origin Bitcoin Fund (FBTC) and BlackRock iShares Bitcoin Trust (IBIT).
- On 18 Dec, FBTC took about 391.5M and IBIT 111.2M (Farside), a top five day for FBTC per a market report.
- Alternative tallies show IBIT 262.11M and FBTC 123.61M that day (SoSoValue), but both sources agree these two led, per a flows recap.
- Bitwise BITB added roughly 21.9M that session, while GBTC saw around 25.1M outflows, per the same recap.
Deep Dive
1. Top Inflow Leaders
The strongest single day this week was 18 Dec, when Fidelitys FBTC drew about 391.5M and BlackRocks IBIT 111.2M, with combined net inflows of roughly 457.3M (Farside methodology) as reported in a market update.
This points to FBTC and IBIT as the primary institutional conduits for Bitcoin exposure this week, consistent across multiple outlets that tracked the days flows.
If you track demand via ETFs, FBTC and IBIT remain the clearest signals. Day-to-day flips happen, so use a rolling view rather than a single print.
2. Method Differences, Same Leaders
Some coverage using SoSoValues cut showed IBIT on top (262.11M) and FBTC next (123.61M) for the same 18 Dec session, while still identifying those two funds as the leaders, per a flows recap.
A second outlet echoed the split (FBTC leading at 391.5M vs IBIT 111.2M) citing Farsides dataset in its write-up. The discrepancy reflects differing vendor methodologies and cut-off times.
Vendor differences can change who won the day, but they rarely change the conclusion that FBTC and IBIT dominate the flow leaderboard.
3. Other Funds And Weekly Skew
Beyond the two leaders, Bitwise BITB contributed about 21.9M on that inflow day, while Grayscale GBTC saw around 25.1M out, per the same recap.
Flows were not uniformly positive every session. A separate weekly wrap showed net outflows of roughly 497M across BTC ETFs for the Dec 1519 week, with FBTC the only major fund posting a net weekly inflow, per a summary.
Leadership concentrates in FBTC and IBIT, but the weekly picture can still skew negative. Single big inflow days may be offset by subsequent outflows.
Conclusion
FBTC and IBIT are the consistent leaders for BTC ETF inflows in the past week, even though vendor data sometimes differs on which topped a given day. The headline 18 Dec inflow spike underscores their dominance, while the mixed weekly totals highlight that momentum can swing quickly with macro and positioning.
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