US spot Bitcoin and Ether ETFs posted a combined $520 million in net outflows on Sept. 16, with the world's largest asset manager sitting at the top of the redemption list on both sides of the ledger. Bitcoin funds shed $296 million while Ether funds gave back another $224 million, according to SoSoValue data, as the market digested the Federal Reserve's rate decision the same day.
BlackRock's iShares Bitcoin Trust (IBIT) led all Bitcoin ETF outflows with $144 million pulled on the day, even as the fund's historical cumulative net inflows remain the largest in the category by a wide margin, at $63.83 billion. On the Ether side, BlackRock's ETHA saw the heaviest single-day redemption of any fund tracked, at $110 million, though its own lifetime net inflows still stand at $12.89 billion. Fidelity's Ether fund FETH posted the second-largest outflow at $55.6 million, its historical total net inflows sitting at $2.22 billion.
The pullback wasn't universal. Morgan Stanley's Bitcoin ETF, MSBT, was the only fund on the Bitcoin side to see net inflows on the day, pulling in $3.47 million against a historical total of $542 million since launch — a reminder that even during a broad outflow day, allocation flows between competing issuers rarely move in lockstep. Smaller-cap crypto ETFs told a different story entirely. HYPE spot ETFs added $1.67 million net, all of it into Grayscale's Hyperliquid Staking product, pushing that fund's lifetime inflows to $141 million against total HYPE ETF assets of $417 million. SOL ETFs pulled in $837,000 net, led by Bitwise's staking product, while XRP ETFs added $3.5 million net through Franklin Templeton's XRP fund, whose lifetime inflows now sit at $483 million.
The divergence matters because it complicates the simplest reading of the day's flows. A combined $520 million leaving the two largest crypto ETF categories on the same day the Fed hiked rates looks, at first glance, like a straightforward risk-off signal. But the fact that three smaller altcoin ETF categories all posted net inflows on the same day suggests investors were rotating within crypto exposure rather than exiting the asset class outright — trimming the most liquid, most heavily owned vehicles while adding to newer, higher-beta ones.
Related: Bitcoin ETFs Extend Outflow Streak to 4 Days as Ether ETFs Draw $216M
The pattern also continues a stretch of choppy flows for the two largest funds specifically. Cointelegraph reported that Bitcoin ETFs shed $462.7 million in the prior week alone, reversing three straight weeks of inflows, while Ether ETFs moved in the opposite direction with nearly $197 million added — a rotation that looked similar in shape, if not in exact scale, to Tuesday's numbers. That earlier divergence had been read as money moving from Bitcoin into Ether specifically; Wednesday's data complicates that story further, since both funds fell together this time even as altcoin products picked up the inflows instead.
Institutional positioning around the two categories has been shifting in other ways too. Grayscale's newest advisor-facing portfolio product skips Bitcoin allocation entirely in favor of a 42% weighting toward Ether, a signal that at least some asset managers are already treating the two flagship crypto assets as substitutes rather than complements. Retail-facing flows are shifting too: Bitwise's ETF clients have been steadily adding XRP exposure even as flagship funds see outflows, part of the same broader rotation playing out across smaller-cap crypto ETFs this week.
The timing also puts the outflows in a specific context: they landed on the same day the Fed delivered its first rate hike since 2023, a decision that had been telegraphed for weeks but still carried enough uncertainty to keep some institutional allocators cautious into the print. ETF flows tend to lag price action rather than lead it, since large redemptions typically clear a day after the underlying trade, which means Wednesday's $520 million in outflows likely reflects positioning from Tuesday's session rather than a reaction to the hike itself. That lag is worth watching in Thursday's data, when flows tied directly to the post-decision rally — and to whichever fund benefited most from short covering in ZEC, HYPE and other higher-beta tokens — should start to show up in the numbers issuers report.
