ProShares' new ETF built for the stablecoin market made a stunning debut, with $17 billion in trading volume on its first day. The fund, named ProShares GENIUS Money Market ETF (IQMM), holds short-term U.S. Treasuries structured to meet reserve requirements under the GENIUS Act, the U.S. federal law regulating stablecoin issuers. It's the first ETF explicitly designed to fit those rules.
To put that $17 billion in context: BlackRock's spot bitcoin ETF, one of the most anticipated launches in years, saw just $1 billion on day one. The massive figure sparked immediate speculation about who moved that money.
Nate Geraci, president of The ETF Store, posted on X that the heavy flows could signal a deal with a major U.S.-based stablecoin issuer, pointing to Circle — the company behind the $74 billion USDC token. Yet Circle's primary reserve fund for USDC, managed by BlackRock, hasn't shown major changes: it held nearly $64 billion in assets as of Friday, up from $59 billion at end of January. No sudden spike there.
Internal reallocation a likelier driver
Ben Johnson, head of client solutions at Morningstar, noted that one of ProShares' own levered ETFs, QTTT, moved $6 billion into IQMM on launch day. That internal shuffle explains a large chunk of the day-one activity. In other words, the bulk of the $17 billion may simply be ProShares moving its own cash around, not a new external whale buying in.
Still, stablecoin issuer demand remains a real possibility. With over $300 billion in U.S. dollar-pegged stablecoins in circulation, a significant portion of those reserves could eventually flow into ETFs like IQMM. Markus Thielen, founder of 10x Research, wrote in a report that IQMM is "currently the only purpose-built tool" complying with the GENIUS Act rules while offering high-speed liquidity.
That makes it a go-to choice for U.S.-based licensed issuers like Circle, Paxos and BitGo, and even for banks eyeing tokenized deposits under the new law. Tether, operator of the $184 billion USDT token, recently rolled out a stablecoin with federal bank Anchorage Digital in the U.S. market. As these entities begin to allocate compliant reserves, IQMM-style ETFs could see steady, structural demand grow.