ETF Flow Focus · Published

Fidelity Took 72% of Friday's Bitcoin ETF Inflows

Where do bitcoin ETF inflows stand as this week opens?

US spot bitcoin ETF inflows enter this week on a two-session positive streak, carried almost entirely by one fund that is not the usual one. Friday, September 18 closed at +$433.0M across the twelve US spot funds, and $310.7M of that — 71.8% — went into Fidelity's FBTC. BlackRock's IBIT, which normally sets the category's direction on its own, took $108.4M, a quarter of the day. That split is genuinely unusual: in the 674 reported trading sessions bryptoflows has recorded since January 2024, it is only the third time a single non-BlackRock fund has captured more than 70% of a day's gross inflow on a day worth $300M or more.

The other two were also FBTC — March 25, 2024 (71.6% of $365.5M) and December 17, 2025 (77.9% of $502.7M). So the pattern has a precedent, and the precedent is Fidelity specifically. What it is not is a new baseline, and the rest of this piece is mostly about why.

Friday's bitcoin ETF inflows were the most lopsided big day since December

Start with what the session actually was in the category's own terms. Friday's net print carried a z-score of +1.22 and sat in the 86th percentile of all 690 sessions on record — a strong day, but nowhere near an outlier. The largest single inflow day bryptoflows has recorded is +$1,373.8M on November 7, 2024, more than three times Friday's figure. Total gross activity was $433.0M against a 2026 median session gross of $238.7M, so the day ran at roughly 1.8x a normal 2026 session. Busy, not extraordinary.

The concentration is the part worth the attention. Of the 193 sessions in the record with gross inflow of $300M or more, Friday is one of three where one non-IBIT product took the clear majority. Friday's product Herfindahl reading closed at 0.578, against a life-to-date product HHI of 0.407 and issuer HHI of 0.439. A single session moves a two-and-a-half-year concentration measure by essentially nothing, so the life-to-date figures are context rather than news — but the gap between 0.578 and 0.407 is the numerical shape of a day that one fund defined.

For FBTC itself, $310.7M is the 13th-largest inflow day in its 674 reported sessions, and its biggest since January 13, 2026 ($351.4M). It is only the second FBTC session above $310M in all of 2026. On the day, Fidelity and BlackRock together took 97% of everything that flowed in, a figure cryptodaily's same-day coverage reports from the same underlying Farside data bryptoflows reads.

Fidelity's $311M mostly bought back what Fidelity sold three days earlier

Here is the number that should temper every headline written about Friday, and it is the one nobody else ran.

FBTC did not arrive at Friday from a standing start. It spent the three preceding sessions redeeming:

That is -$284.1M over three days, and Tuesday's print alone was the 19th-largest outflow day in FBTC's history. Add Friday's +$310.7M and the four-session total for Fidelity comes to +$26.6M. Across the Fed week as a whole, FBTC finished at +$79.9M.

So the fund that "led" Friday round-tripped its own position inside four sessions. Over the trailing twenty sessions FBTC is +$216.2M, and strip out Friday and that becomes -$94.5M — the nineteen sessions before Friday were net negative for Fidelity. Over sixty sessions FBTC is -$55.6M. A single day, however large, has not changed the direction of the fund's longer run.

This matters for how the week gets read. A $311M print described as fresh institutional allocation into Fidelity's product is a different claim from a $311M print that restores a position sold three days earlier, and the flow record is consistent with the second reading without proving it. Creations and redemptions net out authorised-participant activity — hedging, arbitrage, share-class mechanics — so bryptoflows can show the round trip happened but cannot say who did it or why. Anyone asserting the motive is going beyond what this data supports.

Nobody sold on Friday, and seven funds did nothing at all

Breadth on Friday was the cleanest of the week: five products positive, zero negative, with gross outflow of exactly $0.0M. That sounds rarer than it is. All-positive sessions account for 151 of 674 non-closure sessions, about 22% — roughly one session in five has no redemption anywhere in the complex. Friday was the broadest day of the Fed week, which is a low bar: Tuesday saw five products report and all five were negative, with zero positive.

The other side of Friday's breadth is that seven of twelve funds reported exactly zero: Invesco Galaxy's BTCO, Franklin Templeton's EZBC, Valkyrie's BRRR, WisdomTree's BTCW, Morgan Stanley's MSBT, and both Grayscale vehicles, GBTC and the BTC mini trust. Product coverage was 100% — every fund reported. Those are reported zeros, not missing data; bryptoflows holds unreported values as null and never substitutes zero for unknown. The three funds beyond the two leaders that did move were small: BITB +$9.7M, HODL +$2.3M, ARKB +$1.9M.

So the honest description of Friday is narrow rather than broad. Five funds moved, two mattered, and one of those two supplied nearly three-quarters of the total.

Strip out BlackRock and bitcoin ETF flows are negative again

Two Mondays ago this column reported that the eleven US spot funds that are not IBIT had turned positive over the trailing sixty sessions at +$47.1M, the first positive reading on that measure since May 14 after 77 consecutive negative sessions. That piece added a caveat: "a single $50M outflow day at any of the eleven funds would push it back out."

It did. The ex-IBIT sixty-session reading now stands at -$212.4M. The crossing lasted a fortnight.

The current windows show how thoroughly BlackRock still carries the category:

Over twenty sessions IBIT accounts for 109.9% of the category's net flow, which is the arithmetic way of saying the other eleven funds subtract from it. Life-to-date the ratio is 116.1%: IBIT has taken in $64,124.3M against a whole-category net of $55,229.7M, while Grayscale's legacy GBTC has shed $27,844.7M. Friday's Fidelity session is a real deviation from that structure for one day. It is not yet evidence against it.

By issuer over the trailing twenty sessions: BlackRock +$1,937.2M, Fidelity +$216.2M, Morgan Stanley +$84.5M, Bitwise +$34.1M, Franklin Templeton +$4.6M, Valkyrie flat, Invesco Galaxy -$4.7M, WisdomTree -$5.2M, VanEck -$51.2M, Grayscale -$132.9M, ARK 21Shares -$320.5M.

ARK's ARKB remains the category's most persistent detractor: -$376.1M over ten sessions and -$553.2M for 2026 as a whole. It printed a token +$1.9M on Friday after three of the prior four sessions were negative. Whether that bleed is ending is one of the more consequential open questions in the data, and one session of +$1.9M does not answer it.

$1.43B rolls off the 20-day window this week

The mechanical fact that will shape how this week's headlines read, independent of what actually flows.

The trailing twenty-session net is +$1,762.1M. The five oldest sessions in that window — August 21 (+$307.5M), August 24 (+$337.6M), August 25 (+$314.3M), August 26 (+$232.2M) and August 27 (+$242.3M) — sum to +$1,433.9M, and they roll out as this week's sessions roll in.

If the category prints exactly zero every day this week, the twenty-day reading still falls to roughly +$328M through arithmetic alone. Bitcoin ETF inflows would need to total +$1,433.9M this week merely to hold that window flat — more than three times Friday's session, repeated across five days. Last week delivered +$6.1M. The week before delivered -$462.7M. Nothing in the recent record suggests $1.43B is a realistic bar, which means the twenty-day view on the ETF flow dashboard is very likely to deteriorate visibly this week even if demand is perfectly healthy. That decay is late-August strength expiring, not new selling, and it will be misread as the latter.

The wider period totals for orientation: week-to-date +$6.1M, month-to-date +$313.4M, quarter-to-date +$4,025.3M, year-to-date -$1,364.5M. Cumulative net flow since inception is $55,229.7M, still $7,506.2M — about 12.0% — below the category's all-time peak of $62,735.9M.

Do two-session positive streaks usually become three?

The category is on a two-session positive streak. Across the full record, bryptoflows counts 68 completed positive streaks that reached two sessions. 47 went on to a third — about 69%. Of those 47, 39 reached a fourth, about 83%. The longest positive streak on record is nineteen sessions.

So the base rate favours continuation more than the equivalent negative-streak statistic did when this column ran it a week ago. That is worth stating plainly and then discounting appropriately: a 69% base rate drawn from 68 prior occurrences is a weak prior, not a forecast, and it says nothing about magnitude. Two of the three sessions that would extend this streak could be +$5M days.

What would break the pattern is easier to specify. IBIT's last ten sessions run +$117.4M, +$10.7M, -$19.5M, -$24.5M, -$19.2M, +$134.3M, -$161.7M, -$144.1M, +$183.7M, +$108.4M — genuinely two-way, with no settled direction. If IBIT returns to the +$200M to +$500M sessions that were routine in late August, the streak extends on BlackRock alone and Friday's Fidelity anomaly becomes a footnote. If IBIT stays choppy and FBTC does not repeat, the streak ends quickly, because the remaining ten funds have not collectively supplied meaningful positive flow in months.

The week's scheduled catalyst is Thursday

Last week's variable was the Fed. This week's is trade. President Trump is scheduled to host Xi Jinping in Washington on Thursday, September 24 — the second meeting between the two leaders this year and the first visit by a Chinese leader to the White House in over a decade, with FXStreet's preview and Vantage's week-ahead note both framing it as a headline-volatility event rather than one expected to produce a breakthrough. Bitcoin itself has held Friday's gains, trading as high as $82,078 on Monday in Asian hours according to Bloomberg's Monday report.

As with the Fed last week, bryptoflows can observe flows around a scheduled event but cannot attribute them to it. The summit is a dated catalyst on the calendar, not a demonstrated driver of anything in this data.

On the corporate treasury side, Strategy has filed nothing new: its most recent 8-K, filed September 14, records direction none — no purchase and no sale. Thursday's treasury column owns that subject in full.

What this flow data cannot settle

Three limits worth stating directly.

bryptoflows' candle feed is currently unavailable in the site's own source-freshness check, so every bitcoin price in this article is externally sourced and flagged as such. Nothing here is a price claim derived from bryptoflows' data.

Flow is not conviction. A creation is an authorised participant delivering shares into existence, and the reasons range from end-investor allocation to basis trades to hedging. Friday's FBTC round trip is the clearest illustration in recent data of why the distinction matters.

And the composite signal disagrees with itself, which is the honest reading of a week like this one. bryptoflows' institutional support score now reads 38.1, classified as moderate accumulation, up sharply from the 23.8 Friday's signal piece reported before Friday's session landed. Confidence sits at 67.0. Underneath it, supply absorption scores 75.5 and treasury capacity 94.6, while flow breadth reads -16.7 and flow concentration -7.9. The components pulling the score up are not the flow components. The flow components are, precisely, the ones measuring how few funds are doing the work.

Saturday's recap covers the completed week in full. Live readings are always on the overview dashboard. Flow figures throughout are read from bryptoflows' own API, sourced from Farside Investors and current through the September 18 close.