US spot bitcoin ETFs recorded $462.7 million in net outflows across the four trading days from September 8 to 11, ending the strongest three-week inflow streak of 2026 just as the Federal Reserve prepared its next rate decision. Ethereum ETFs ran the other way, taking in $196.9 million over the same window, including a $216.4 million surge on Friday.
The split is one of the sharpest divergences between the two largest crypto assets this year. ARK 21Shares led bitcoin withdrawals with $234.2 million, followed by Grayscale, BlackRock and Fidelity. On the ether side, BlackRock’s iShares Ethereum Trust took $148.8 million of Friday’s total, with 21Shares’ Core Ethereum ETF adding $29.1 million, according to SoSoValue data compiled by KuCoin and CryptoRank.
A rough week, then a quieter Friday
The week started unevenly. Tuesday saw $24.3 million leave bitcoin funds, Wednesday brought $34.7 million back in, and Thursday another $29.9 million walked out. Then the selling turned serious: the funds shed $282.7 million in a single session, their largest daily outflow since July. Friday’s bleed slowed to about $13 million.
Bitcoin spent the week below $80,000 after a failed attempt to reclaim that level. CoinStats showed BTC trading at $76,846 early Monday, down 0.58% over 24 hours and 4.55% over seven days. Ether held up better, trading near $2,500 after a rally earlier this month pushed it past $2,600 for the first time since January. That move triggered roughly $665 million in liquidations across the market, including $400 million in short positions, and left ether up more than 30% in August on ETF inflows and whale accumulation.
BlackRock’s flagship takes its biggest hit
Friday also produced the largest single-fund redemption of the day: $19.23 million out of BlackRock’s iShares Bitcoin Trust, per Crypto Briefing and Cryptonomist. That number sounds dramatic until you size it against the fund. IBIT holds more than $60.6 billion in assets, so the withdrawal equals roughly 0.03% of the fund.
Since launching in January 2024, IBIT has collected about $64 billion in cumulative net inflows and remains the largest bitcoin ETF by a wide margin. BlackRock does not sell bitcoin on its own initiative; redemptions flow mechanically through Coinbase Prime, the fund’s custodian. The broader category lost about $13 million net on Friday, meaning some competing funds actually attracted fresh capital while IBIT bled.
For context, most ETFs in any asset class never reach $1 billion in assets. IBIT blew past that milestone in its first week of trading in 2024 and has led the category in both inflows and assets ever since. The fund’s scale means even trivial-looking redemption days make headlines, because IBIT’s flows are treated as a proxy for institutional sentiment toward bitcoin as a whole.
Why the divergence matters
Two forces are pulling in opposite directions. On the macro side, CME FedWatch priced a 25 basis point hike at 87.3% ahead of the September 15-16 FOMC meeting, and risk assets hate that setup. Traders cut exposure to the most liquid, most heavily traded crypto product first. Oil near $107 a barrel after the Saudi East-West pipeline outage, and a hot inflation print earlier in the month, have kept the hawkish case alive.
On the ether side, the staking story is doing real work. BlackRock’s staking fund ETHB has taken in $307.72 million across 20 straight inflow days since July 28 without a single day of redemptions, and its net assets passed $1 billion. The fund stakes 70-95% of its holdings, and as of September 11 held about 313,789 staked ETH worth $802.9 million, or 74.55% of assets. Another 107,128 ETH worth $274.1 million remained unstaked. Its 30-day staking rewards rate stood at 1.52%. That gives institutional buyers an income stream that a plain spot bitcoin ETF cannot offer.
ETHB is still small next to the flagship. ETHA has accumulated roughly $13 billion in net inflows and holds about $9.11 billion in net assets, making it the preferred Blackrock vehicle for institutional ethereum exposure. The gap suggests staking is supplementing spot demand rather than replacing it. What stands out is the behavior of ETHB investors: no outflow days at all points to strategic allocators rather than short-term traders rotating in and out.
Selective, not risk-off
The result is that institutional positioning has become selective rather than broadly defensive. Money left bitcoin funds but did not leave crypto entirely. Ether funds posted their strongest session of the week on Friday, hours before the Fed decision, which reads as positioning rather than panic.
Whether the pattern survives Tuesday is the open question. If the committee hikes as expected and signals more to come, both sides of the trade probably come under pressure. If the statement surprises dovish, the ether bid looks more defensible than the bitcoin exit. Analysts also point to the Senate’s scheduled cloture vote on the CLARITY Act crypto market-structure bill the same day as a second volatility catalyst. Seventeen state attorneys general asked the Senate to reject the bill on Monday, arguing its language on state enforcement powers is ambiguous, which adds another layer of uncertainty to a week already loaded with macro risk.
The ethereum side has its own incoming event: BlackRock’s staking ETF has now proven that yield-bearing crypto funds can hold a clean accumulation streak through a choppy month, and issuers watching from the sidelines have noticed. More staking-enabled products are in the pipeline for late 2026, according to fund filings tracked by industry analysts.
For now the flows tell a simple story: the investors who piled into bitcoin funds for three straight weeks took profits into the Fed meeting, and a smaller group rotated toward ether products with yield attached. September flows for bitcoin ETFs remain positive overall despite last week’s losses, so the streak ended without flipping the month. The next test is whether Tuesday’s decision restores the inflow engine or extends the exit.