ProShares IQMM ETF Surpasses $22.7 Billion as Stablecoin Reserves Drive Record Growth
The ProShares GENIUS Money Market ETF has amassed $22.7 billion since its February 2026 launch, serving as the primary reserve vehicle mandated by the GENIUS Act for major stablecoin issuers.
ProShares' GENIUS Money Market ETF (IQMM) has expanded to $22.7 billion in assets since its launch in February 2026, securing its place as the largest money-market ETF in history. This unprecedented accumulation of capital is driven almost entirely by stablecoin issuers parking reserves to comply with the GENIUS Act, rather than by traditional retail investors or financial advisors seeking higher yields.
The fund's rapid ascent follows the enactment of the federal stablecoin law in July 2025, which imposed comprehensive requirements on payment stablecoins operating in the United States. Under the legislation, issuers must segregate reserves from operating funds and hold them in qualifying assets, a mandate that created an immediate need for a compliant investment vehicle. IQMM was engineered specifically to fill this gap, offering a single wrapper that satisfies the law's strict requirements while providing intraday liquidity and weekly distributions.
Since its listing on 17 February 2026, the fund has demonstrated extraordinary momentum, recording a record $17 billion in first-day trading volume. By the time of this reporting, the asset base had grown to $22.7 billion, with the majority of holdings attributed to major stablecoin providers such as Circle and Tether. These entities utilise the ETF to meet the GENIUS Act's mandate that reserves be backed 1:1 by physical currency, U.S. Treasury bills, or approved low-risk instruments, with rehypothecation explicitly prohibited.
Structurally, IQMM invests exclusively in cash and U.S. Treasuries with maturities of 93 days or less, targeting a weighted average maturity of under 60 days. The fund charges a 0.15% net expense ratio, which was waived from the stated 0.20% through January 2027, and anchors its net asset value around $100 per share. While it offers a competitive 3.52% SEC yield, this comes with a fee premium compared to existing short-duration Treasury ETFs from competitors like BlackRock, Vanguard, and State Street.
The distinction lies in regulatory compliance rather than pure cost efficiency. Established giants such as BlackRock, Vanguard, and State Street possess the infrastructure to launch similar products but have not yet done so. Neither the iShares 0-3 Month Treasury Bond ETF nor Vanguard's 0-3 Month Treasury Bill ETF operates under the specific regulatory framework required by the GENIUS Act, making IQMM the only compliant option for issuers facing federal scrutiny.
This development highlights a new category of ETF demand driven entirely by regulatory architecture. As the stablecoin market continues to grow, the reserves backing these tokens will require a secure home, and IQMM has positioned itself as the primary destination for these mandated funds. The question for the market now is whether other major asset managers will follow ProShares' lead to capture this regulatory niche.
