IBIT Dominates as Bitcoin ETFs Post $301M Weekly Win
Bitcoin ETFs snapped a two-week outflow streak with $301M net, but IBIT captured $565.7M while every other fund combined lost $264.5M.
Key Points
- BlackRock's IBIT pulled in $565.7M last week while every other spot Bitcoin ETF combined bled $264.5M — a concentration signal with direct implications for volatility.
- The average IBIT buyer cost basis near $81,300 now sits above current BTC spot price, the classic setup for accelerated redemption pressure.
- Watch SPY $757.94 as the binary trigger: a break lower before the October 28 Fed decision could pull BTC back toward $78,000 and restart the outflow cycle.
US spot Bitcoin ETFs posted $301M in net weekly inflows for the week ending October 23, snapping a two-week losing streak — but strip out BlackRock's IBIT and the rest of the category bled $264.5M. That is not a healthy market. That is one fund carrying an entire asset class on its back while the underlying asset trades below the average buyer's entry price.
One Fund, One Problem
The week's structure was almost theatrical in its symmetry. Monday through Wednesday delivered $1.07 billion in aggregate inflows as Bitcoin climbed to a weekly high of $84,777 on Wednesday. Then Thursday hit: $635.6M walked out the door in a single session — the largest daily withdrawal of October — followed by another $137.9M on Friday. The two-day reversal totaled $773.5M, nearly wiping out everything the week had built. What saved the headline number was IBIT, which ended the week with $565.7M in net inflows while competitors like Fidelity's FBTC and the remaining field posted collective losses.
That IBIT concentration is no longer a curiosity — it is a structural risk. When a single fund accounts for more than 100% of category net flows, any institutional decision to reduce IBIT exposure triggers category-level pain with no offsetting bid from competing products. The fund's dominance also means Bitcoin ETF flows are increasingly a function of BlackRock's institutional client base and US equity market sentiment rather than retail crypto conviction. That linkage has teeth when equities are under pressure — as they are right now, with SPY sitting just below its $762.73 pivot and VIX elevated at 19.69.
The Cost Basis Trap
The more immediate problem is arithmetic. The average ETF buyer cost basis sits near $81,300, per Farside Investors data, while Bitcoin was trading closer to $80,000 heading into the weekend. The average spot Bitcoin ETF holder is underwater. That is not a catastrophic spread — roughly 1.6% in the red — but it is the kind of position that converts patient holders into sellers the moment macro conditions deteriorate. A Fed statement on October 28 that signals rates staying higher for longer, or a CPI print that surprises to the upside before year-end, could be the catalyst that tips marginal holders into redemption.
October's cumulative picture reinforces the fragility. Month-to-date net outflows stood at approximately $314M after Thursday's single-session exit erased the brief midweek recovery into positive territory. The funds have drawn inflows in only a minority of October trading sessions. Against the backdrop of cumulative net inflows of $57.6 billion and total net assets of $100.2 billion, the monthly reversal looks modest — but momentum is the variable that matters for near-term flows, and October's momentum is negative.
What Happens After the Fed
The October 28 Federal Reserve decision is the most important near-term input for Bitcoin ETF flows, and not primarily because of what the Fed says about crypto. It matters because IBIT's dominance has made Bitcoin a proxy for risk appetite in US equity markets. When SPY sells off, IBIT tends to see redemptions; when QQQ rallies, Bitcoin gets a bid. With the 10-year yield pressing 4.99% heading into Monday's session and Brent crude at $116.72 following Houthi strikes on Saudi Arabia — its highest level since April 29 — the macro environment is not friendly to risk assets.
The XRP ETF category offered a small counter-signal last week, drawing approximately $4.25M in inflows led by Franklin Templeton's XRPZ. Since launching in November 2025, the XRP ETF category has built cumulative net inflows of around $1.8 billion. The numbers are modest relative to Bitcoin's $100.2 billion asset base, but the directional divergence is worth noting: retail and institutional buyers are still finding reasons to add altcoin exposure even as the two largest crypto ETF categories bleed. That suggests the selling in Bitcoin and Ether ETFs is at least partly asset-specific rather than a wholesale exit from the crypto ETF wrapper.
For traders, two levels define the setup into Wednesday's Fed decision. On the upside, Bitcoin needs to reclaim and hold above $81,300 — the average ETF buyer cost basis — to shift the redemption psychology from defensive to neutral. On the downside, a clean break of $78,500 would put the category's largest single-session outflow record back in play and likely force a re-test of the broader $75,000 support that held in the spring. The SPY $757.94 level is the equity-market trip wire: lose that before the Fed speaks and expect Bitcoin to feel it within hours, not days.
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