Tokenized money market funds can be used as collateral across most U.S. margin, repo and securities-lending workflows today, according to a July 2026 report from Global Digital Finance (GDF) and the International Swaps and Derivatives Association (ISDA) — with two clear exceptions where the rules still say no. The finding matters because it moves tokenized money market funds (TMMFs) from a theoretical use case to a near-production one, backed by live simulations from firms including BlackRock, State Street, Citi and Fidelity.
Key takeaways
- TMMFs as collateral largely works legally. GDF and ISDA assessed three tokenization models across ten legal and regulatory dimensions and found favorable guidance or an existing legal fit for eight of them.
- Two hard blockers remain. Money market funds are explicitly excluded as cleared variation margin, and there is no explicit SEC guidance for tokenized funds posted as uncleared initial margin.
- Tokenization is a recording method, not a new asset. The report stresses that a token is the legal record of ownership or a securities entitlement — tokenizing a fund does not recharacterize it.
- The industry is moving fast. Survey data cited in the report shows 66% of firms plan to launch TMMFs before the end of 2027, and 44% expect to accept them as collateral by then.
- 48 firms ran live sandbox simulations on rails powered by Ownera, testing everything from disputed pledges to central-counterparty substitutions.
What are tokenized money market funds used as collateral?
Tokenized money market funds are shares in a regulated money market fund — registered under section 2(a)(7) of the U.S. Investment Company Act of 1940 — recorded or mirrored on a distributed ledger so they can be pledged, transferred and re-used programmatically. Using TMMFs as collateral means posting those fund shares directly to meet a margin, repo or securities-lending obligation, rather than first redeeming the fund into cash and sweeping that cash back afterward.
That redemption-and-sweep cycle is the inefficiency the GDF-ISDA working group set out to remove. According to the report, $1.6 trillion of non-cleared initial and variation margin was collected at year-end 2025, and rising cash demands for margin create both operational friction and liquidity strain during volatile markets. Posting a yield-bearing fund share directly — and moving it intraday with settlement finality — is the promised fix.
The GDF-ISDA working group and sandbox
The U.S. Tokenized MMF Working Group was co-sponsored by GDF and ISDA, following an earlier GDF effort in the European Union and United Kingdom in 2025. According to the report, it drew more than 300 participants from over 120 firms, with 48 firms running live near-production simulations inside the GDF Industry Sandbox, powered by digital-asset infrastructure firm Ownera.
The group split into two workstreams: a legal, regulatory and operations (LRO) stream that met biweekly, and a sandbox stream that delivered three simulation rounds over the second quarter of 2026. Its core question was whether TMMF shares can meet four tests of institutional collateral in the U.S. market: whether they are legally recognizable and transferable, operationally controllable, acceptable under the relevant regulatory framework, and accessible in a default or insolvency scenario.
Three tokenization models, ten legal dimensions
A central contribution of the report is its framework, which maps three tokenization models against the joint SEC-CFTC Digital Asset Taxonomy. The three models are:
- Digital Native — the fund issuer or its transfer agent uses the distributed ledger itself as the authoritative books and records for share ownership.
- Digital Twin — the authoritative record stays off-chain, and the on-chain token mirrors it as a “mirror ledger.”
- Custodial / Intermediated — a bank, broker or other securities intermediary custodies the shares for clients, with its records maintained on or updated from the ledger.
A fourth model, Synthetic Tokenized Securities, was assessed but placed outside the report’s scope. Crucially, GDF and ISDA emphasize that tokenized assets are not a separate asset class — a token is the legal record of ownership under the Digital Native model, or a securities entitlement under the Digital Twin and Custodial models. Tokenizing on-chain does not alter the underlying fund.
Each model was scored across ten legal and regulatory dimensions, including transfer-agent recordkeeping on the ledger, characterization and perfection under Uniform Commercial Code Articles 8, 9 and 12, and eligibility across cleared variation margin, uncleared initial margin under three separate regulators, uncleared variation margin, and repo and securities-lending collateral.
Where TMMF collateral works — and where it stalls
The analysis concluded that across all three tokenization models, favorable guidance or an existing legal, contractual or regulatory fit exists for eight of the ten dimensions. Two dimensions are the exceptions and, per the report, the ones market participants should watch most closely:
- Cleared variation margin — explicitly non-eligible. Money market funds are excluded as collateral for cleared VM, a limitation the report flags as a potentially significant impediment regardless of tokenization.
- Uncleared initial margin under the SEC — no explicit guidance. With no rule specific to tokenized securities, the working assumption is that tokenized shares are treated the same as their non-tokenized equivalents, leaving an open question that may require contractual changes.
The report also flags three softer legal domains that need attention: credit support annexes (CSAs) may need updating to define what counts as an effective transfer of a token; settlement finality must be analyzed through both legal and operational lenses and differs by model; and U.S. insolvency “safe harbors” are transaction-based, so a tokenized asset inside a qualifying “protected contract” should keep its protected status.
The regulatory tailwind
None of this would be actionable without the shift in U.S. policy. The report credits the enacted GENIUS Act, the pending CLARITY Act and the joint SEC-CFTC Digital Asset Taxonomy for the clarity that made the assessment possible. We covered how the GENIUS Act reshapes stablecoins and U.S. debt markets, and the same regulatory opening is now pulling regulated funds on-chain.
The momentum shows in the numbers. According to the report, real-world asset tokenized assets under management reached $8.4 billion as of May 2026 — a 298% increase from 2024. Survey data from the ValueExchange cited in the report found that only 33% of firms view current MMF processes as efficient, which helps explain why 66% plan to launch TMMFs and 44% expect to accept them as collateral before the end of 2027.
This is the same institutional plumbing story driving tokenized U.S. Treasuries through firms like Ondo Finance and the bank infrastructure bets behind Chainlink — collateral that moves at the speed of a message, not a settlement window.
Frequently asked questions
What is a tokenized money market fund?
A tokenized money market fund is a share in a regulated money market fund whose ownership is recorded on, or mirrored by, a distributed ledger. Per the GDF-ISDA report, the fund itself is unchanged — it remains registered under the 1940 Act — and the token is simply the legal record of ownership or a securities entitlement.
Can tokenized money market funds be used as collateral in the U.S.?
Largely yes. The 2026 GDF-ISDA assessment found favorable guidance or an existing legal fit for using TMMFs as collateral across eight of ten tested dimensions, covering uncleared variation margin, most uncleared initial margin, and repo and securities lending. The two exceptions are cleared variation margin, where money market funds are explicitly excluded, and uncleared initial margin under the SEC, where no explicit guidance exists.
Why do institutions want TMMFs as collateral?
Using TMMFs lets collateral move with greater speed and precision, supporting intraday margining and dynamic re-use across obligations. It removes the redemption-to-cash-and-sweep cycle of traditional money market funds, which the report identifies as an operational and liquidity drag — especially during market volatility.
Who ran the tokenized collateral sandbox?
Global Digital Finance and ISDA co-sponsored the U.S. Tokenized MMF Working Group, which drew more than 300 participants from over 120 firms. The live simulations were run by 48 firms inside the GDF Industry Sandbox, powered by Ownera, with named participants including BlackRock, State Street, Citi, Fidelity, Standard Chartered and Invesco.
