TheBlock
Fidelity Investments has launched the Fidelity Reserves Digital Fund (FYMXX), a government money market fund explicitly designed to custody the reserve assets backing regulated stablecoins. Shares are offered to institutional investors — the prospectus says fund shares are "expected to be held primarily by one or more stablecoin issuers as all or a portion of the reserve assets that back the stablecoins issued to their customers."
The fund invests exclusively in reserve assets permitted under the GENIUS Act: U.S. Treasury bills, notes and bonds, cash, overnight repurchase agreements, and other compliant government money market funds. It launched on June 15 with a $1 million minimum initial investment, a 0.25% management fee, and a target NAV of $1.00 per share. Assets are expected to swing with stablecoin mint and redemption flows, particularly in volatile market windows.
Why it matters
Fidelity's entry formalizes a new institutional product category: money market funds built specifically to satisfy the GENIUS Act's reserve composition rules. State Street launched a comparable product this week, and BNY Mellon, Goldman Sachs and BlackRock rolled out similar funds last year — meaning every major US custodian is now competing for the same $315 billion stablecoin float. For stablecoin issuers, the fund offers a turnkey, regulator-friendly cash-management vehicle; for Fidelity, it's a fee stream tied directly to the growth of dollar-pegged tokens.
Market impact
The race for stablecoin reserve mandates is a leading indicator of where TradFi expects the next leg of tokenization to land. With USDT alone controlling roughly 59% of the $315B market, even modest migration of issuer reserves into yield-bearing MMFs would redirect meaningful Treasury demand through a small set of custodian bank balance sheets. Watch for disclosed fund AUM in Fidelity's first monthly statement — the size of the seed allocation will signal how aggressively issuers are already positioning for full GENIUS compliance.
Frequently asked questions
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What is the Fidelity Reserves Digital Fund (FYMXX)?
FYMXX is a government money market fund Fidelity launched on June 15 for institutional investors, designed to custody the reserve assets backing regulated stablecoins under the GENIUS Act. It targets a $1.00 NAV with a 0.25% management fee and a $1M minimum investment.
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What assets can the Fidelity stablecoin reserve fund hold?
The fund invests only in GENIUS Act-permitted reserve assets: U.S. Treasury bills, notes and bonds, cash, overnight repurchase agreements, and other compliant government money market funds. No corporate credit or commercial paper.
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Why are major banks launching stablecoin reserve funds?
State Street, BNY Mellon, Goldman Sachs and BlackRock have all rolled out similar products in the past year, and Fidelity joined this week. The GENIUS Act defines which assets compliant stablecoins can back, creating demand for turnkey, regulator-friendly cash vehicles — and a fee stream tied to the $315B stablecoin…
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How big is the stablecoin market that these funds serve?
Total stablecoin market capitalization stood at approximately $315 billion, with Tether's USDT holding roughly 59% of the market. Even a modest share of issuer reserves migrating into yield-bearing money market funds represents meaningful Treasury demand routed through custodian balance sheets.
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How will fund AUM move with stablecoin supply?
The FYMXX prospectus states that fund assets are expected to fluctuate with stablecoin mint and redemption activity, especially during periods of market uncertainty. Stablecoin growth would expand the reserve base, while redemptions would contract it.
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