BlackRock BUIDL Explained: The Flagship Tokenized Treasury Fund (2026)

TL;DR

• BlackRock BUIDL — the BlackRock USD Institutional Digital Liquidity Fund — is the flagship tokenized US Treasury fund — roughly US$2.6B AUM in mid-2026 (after briefly touching ~$3B), running neck-and-neck with Circle's USYC (~$2.9B) for the top spot per rwa.xyz.
• It launched on Ethereum on 20 March 2024 with US$100M of seed capital and expanded multichain on 13 November 2024 to Aptos, Arbitrum, Avalanche, Optimism and Polygon.
• Securitize is the issuer, transfer agent, and SEC-registered broker-dealer; BNY Mellon is custodian; Securitize Capital is transfer agent of record. The minimum subscription is US$5M and the fund is restricted to accredited and qualified-purchaser investors.
• BUIDL has become the institutional anchor for on-chain finance: backing Ethena USDtb, feeding Frax sFRAX reserves, used by Sky USDS via Spark, serving as collateral at FalconX, anchoring BounceBit Prime and underpinning Ondo OUSG.

Table of contents

• What is BlackRock BUIDL?
• The launch: 20 March 2024 and what came before
• The 13 November 2024 multichain expansion
• How BUIDL works under the hood
• The Securitize, BNY Mellon, and BlackRock partnership
• BUIDL in DeFi: Frax, Sky, Ethena, FalconX, BounceBit, Ondo
• BUIDL competitor landscape
• Larry Fink and the tokenization thesis
• The 2026 RWA market state
• Comparison: top tokenized treasury products
• BUIDL vs stablecoin yield (USDe sUSDe, USDY)
• Risks and criticism
• How to access BUIDL exposure (institutional and retail paths)
• Research and reports
• FAQ
• Glossary
• Related reading
• Sources and further reading

What is BlackRock BUIDL?

BUIDL — the BlackRock USD Institutional Digital Liquidity Fund — is a tokenized money market fund issued on public blockchains by BlackRock, the world's largest asset manager. The fund holds short-duration US Treasury bills, repurchase agreements collateralized by Treasuries, and cash; it pays daily yield to token-holders by minting additional BUIDL tokens directly to their wallets. Each BUIDL token is a regulated security representing one US dollar of fund equity, transferable on-chain only between Securitize-whitelisted wallets.

The fund is operationally run by BlackRock Digital Assets, the dedicated tokenization arm BlackRock established in 2023; the BlackRock Inc. parent provides the management capacity. The fund is structured as a British Virgin Islands (BVI)-domiciled vehicle, distributed under Reg D / Reg S exemptions to accredited and qualified-purchaser investors.

In plain terms: BUIDL is a money market fund with the same kind of underlying assets as your brokerage's sweep account — but the fund's share register is a smart contract on Ethereum (and five other chains) instead of a database at a bank transfer agent. The minimum subscription is US$5 million and the fund pays out yield in the same way a traditional MMF pays a daily distribution — only the distribution is delivered by token mint, not by ACH wire.

What makes BUIDL the centerpiece of the 2024-2026 RWA wave is not its mechanical novelty (Franklin Templeton's BENJI predates it on Stellar by three years) but the institutional gravity of its backers. When BlackRock — manager of US$13.9 trillion as of Q1 2026 — chose Ethereum and Securitize as the rails for its first publicly-marketed tokenized fund, it set the template for every other US tier-1 asset manager that followed.

The launch: 20 March 2024 and what came before

BUIDL launched on Ethereum on 20 March 2024 with US$100 million of initial seed capital provided by Securitize and a small set of crypto-native institutions. The launch was preceded by months of buildup that ran in parallel with BlackRock's spot Bitcoin ETF (IBIT) launch in January 2024 — both products are part of the same strategic pivot.

The pre-launch context matters. Throughout 2022 and 2023, MakerDAO (now Sky) had been quietly rotating its DAI/USDS reserves into Treasury-backed RWAs, climbing from a fraction to over US$3B in real-world assets through Monetalis, BlockTower, and Centrifuge structures. Ondo Finance had launched OUSG in early 2023 on top of the BlackRock iShares short-Treasury ETF (SHV). Franklin Templeton's BENJI / FOBXX had been live since 2021. The institutional plumbing — KYC tooling at Securitize, Anchorage and BitGo for crypto-trust custody, Coinbase Prime for institutional fiat rails — had matured to the point that a major asset manager could issue an on-chain product without owning the entire stack.

What BlackRock added was distribution credibility and the SEC's de facto blessing of the structure. Securitize had been an SEC-registered transfer agent since 2019; it was already the issuer of record for Hamilton Lane SCOPE, KKR HCSI, Apollo ACRED and others. By 2024 the Securitize tooling was institutional-grade, and BlackRock simply leveraged the existing rails.

In its first 90 days BUIDL grew from US$100M to over US$500M of AUM. By the end of 2024 it had passed US$1B; in mid-2026 BUIDL holds roughly US$2.4-2.6B in AUM (briefly touching ~$3B in June 2026) and remains a dominant on-chain Treasury collateral asset in both DeFi and CeFi. In May 2026 BlackRock filed with the SEC for two further tokenized funds plus an on-chain share class for a US$7B money-market fund.

The 13 November 2024 multichain expansion

BUIDL's second milestone came on 13 November 2024, when BlackRock and Securitize deployed BUIDL simultaneously on five additional chains — Aptos, Arbitrum, Avalanche, Optimism and Polygon — bringing the total chain footprint to six. The expansion was significant for several reasons:

• It was the first time a major tokenized fund had committed to a multichain identity rather than picking a single L1 winner. Subsequent multichain launches by Apollo ACRED, Ondo OUSG and Hashnote USYC followed the same playbook.
• It validated each of the chosen chains for institutional issuance. Arbitrum and Polygon already hosted institutional pilots, but Avalanche, Optimism and Aptos got a major institutional anchor product.
• It signaled that BUIDL would be the collateral backbone of stablecoins and DeFi protocols across multiple ecosystems, not just Ethereum.

The multichain expansion was supported by Wormhole's NTT framework for Aptos and chain-native Securitize integrations on the EVM chains. Custody remained centralized at BNY Mellon regardless of which chain a token-holder sat on.

How BUIDL works under the hood

The BUIDL stack has six layers, each anchored by an institutional counterparty:

1. Sponsor / fund manager: BlackRock Inc. and BlackRock Digital Assets. BlackRock is the registered investment adviser to the fund.
2. Fund vehicle: a British Virgin Islands (BVI) company structured under Reg D 506(c) and Reg S, with sub-feeders as needed for offshore distribution.
3. Transfer agent and broker-dealer: Securitize — SEC-registered transfer agent, broker-dealer (Securitize LLC), and ATS operator (Securitize Markets). Securitize Capital is the digital transfer agent and Securitize Investment Management acts as collateral manager for parts of the wider Securitize ecosystem.
4. Custodian and fund administrator: BNY Mellon holds the underlying Treasury bills, repos and cash, calculates NAV, and provides fund accounting. BNY Investments and BNY Mellon Wove (the digital-assets platform) provide auxiliary services.
5. Token contract: an ERC-20 on Ethereum (and chain-native equivalents on Aptos, Arbitrum, Avalanche, Optimism, Polygon) with transfer restrictions enforced by a Securitize whitelist. Only KYC'd, accredited or qualified-purchaser wallets can hold or receive BUIDL.
6. Distribution and DeFi: secondary trading on Securitize Markets ATS; institutional placement via Coinbase Prime and select prime brokers; DeFi integration through wrappers like Ondo OUSG, Ethena USDtb, and Frax sFRAX.

Yield is paid by daily token mint. Each business day, BlackRock calculates the day's net income from the underlying portfolio, applies the management fee, and Securitize mints new BUIDL tokens to each holder pro rata. The mint event is on-chain and observable; this is one of the operationally novel features of BUIDL versus traditional MMFs, which credit dividends through legacy ACH plumbing with multi-day lag.

Redemption is processed via Securitize: a holder submits a redeem instruction, Securitize burns the BUIDL tokens, and BlackRock wires fiat to the investor — typically T+0 or T+1. The on-chain leg of redemption is also instant, in contrast to the multi-day settlement of traditional fund redemptions. Importantly, BUIDL is also redeemable to USDC on a 1:1 basis through a Circle integration, providing on-chain liquidity without leaving the crypto rails — a feature heavily used by stablecoin issuers and DeFi treasuries.

The Securitize, BNY Mellon, and BlackRock partnership

The institutional triangle of BlackRock × Securitize × BNY Mellon is the operational core of BUIDL. Each party brings something the other two need:

• BlackRock brings asset-management capacity, distribution to institutional LPs, and the strategic decision that tokenization is a frontier worth occupying.
• Securitize brings SEC-registered tokenization rails, on-chain transfer-agency and the smart-contract template for compliant token issuance. CEO Carlos Domingo (a Spanish entrepreneur, formerly CEO of Telefónica I+D), his co-founders, and Securitize Capital are the institutional brand. BlackRock invested in Securitize in 2024 as part of the BUIDL launch.
• BNY Mellon brings the qualified-custodian status, fund accounting, NAV calculation, and traditional-finance custody linkages required for an SEC-registered fund. As of 2025, BNY also offers stablecoin-issuer custody to several major issuers (USDC, FDUSD, RLUSD), positioning itself as the bank-of-record for the tokenization era.

Securitize's reach has expanded well beyond BUIDL. As of 2026 Securitize is the issuer-of-record for Apollo Diversified Credit Securitize Fund (ACRED), Hamilton Lane Senior Credit Opportunities, KKR Health Care Strategic Growth II, Hamilton Lane Equity Opportunities V, Hamilton Lane Secondary Fund VI, multiple Apollo private credit feeders, and dozens of smaller institutional vehicles. The platform also runs the Securitize iCapital marketplace and is integrating with the TRON network for tokenized asset offerings and the NYSE tokenized securities platform where it became the first registered digital transfer agent.

The BlackRock-Securitize-BNY architecture is the template most subsequent institutional tokenized funds have followed. UBS uMINT, Janus Henderson's tokenized treasury pilot, and several other major-bank pilots of 2025-2026 use a similar tri-party structure.

BUIDL in DeFi: Frax, Sky, Ethena, FalconX, BounceBit, Ondo

BUIDL's economic significance derives almost entirely from the protocols that consume it as collateral or reserve asset:

Frax sFRAX

Frax Finance integrated BUIDL into the Frax USD reserve stack in 2024, layering BUIDL-derived yield into the sFRAX staking module. This let Frax pass through SOFR-aligned yield to sFRAX holders without taking direct credit exposure to BlackRock — Frax holds the BUIDL tokens, captures the daily mint, and routes the yield through Frax governance.

Sky / MakerDAO via Spark

Sky Protocol (formerly MakerDAO) routes USDS-backing capital into BUIDL through its Spark Liquidity Layer and the Sky Lending allocator. The mechanism: Sky's RWA allocator subscribes BUIDL tokens via Securitize, captures BUIDL's daily yield, and feeds that yield into the Spark Savings sUSDS pool. By 2026, Sky/Maker is a multi-hundred-million-dollar BUIDL holder. The arrangement gives Sky the regulated, dollar-denominated yield it needs to anchor USDS without operational complexity. SparkLend sits on top, offering BUIDL-backed sUSDS as collateral for crypto-native borrowing.

Ethena USDtb

Ethena Labs launched USDtb in late 2024 — a stablecoin fully backed by BlackRock BUIDL. USDtb is the institutional twin of Ethena's flagship USDe stablecoin (which uses ETH-perp-basis-trade structure). USDtb is over 90% backed by BUIDL; its supply peaked above US$1B before settling around US$0.6-0.9B in mid-2026, and since 2025 it has been issued by Anchorage Digital Bank under federal OCC oversight. USDtb remains one of BUIDL's largest single counterparties.

FalconX margin collateral

The institutional prime broker FalconX accepts BUIDL as margin collateral, allowing institutional crypto traders to post tokenized Treasuries as initial margin while continuing to earn the underlying yield. This is a structural improvement over posting USDC (zero yield) or Treasury T-bills (no settlement on weekends) and represents a material 24/7 capital-efficiency gain.

BounceBit Prime

BounceBit Prime — operated on the BounceBit chain — uses BUIDL within its CeDeFi yield vaults, layering BUIDL's regulated yield with on-chain perp-funding-rate strategies. BounceBit Prime is one of the more aggressive vehicles for stacking RWA yield with crypto-native strategies.

Ondo OUSG and BENJI/BENJI

Ondo Finance's OUSG — Ondo Short-Term US Government Bond Fund — holds BUIDL plus Franklin BENJI as its underlying. Ondo offers OUSG as a tokenized DeFi-composable wrapper that aggregates institutional-grade tokenized MMFs into a single on-chain unit. Ondo USDY (Ondo USD Yield) is a permissionless retail yield-bearing note for non-US users, backed by short-dated Treasuries plus bank deposits. Ondo Global Markets extends the rail into tokenized US equities. Ondo Chain, announced February 2025, is a purpose-built RWA L1 designed around BUIDL-class collateral as native gas asset.

MakerDAO endgame

The MakerDAO "Endgame" plan — Sky's long-term roadmap to spin out subDAOs and migrate to a USDS-anchored multi-jurisdictional structure — explicitly assumes BUIDL-class assets at the base of the reserve stack. The arrangement institutionalizes what had previously been ad-hoc RWA exposure under the MakerDAO RWA allocator.

Aave Horizon RWA

Aave Horizon RWA, launched 2025, is Aave's permissioned RWA-collateral market, accepting tokenized Treasury and money-market funds (Superstate's USTB and other BUIDL-class assets) for regulated borrowing structures.

BUIDL competitor landscape

BUIDL led the tokenized Treasury market for most of 2024-2026, though by mid-2026 Circle's USYC runs slightly ahead on rwa.xyz's count. The major peers as of mid-2026:

Franklin Templeton BENJI / FOBXX

Franklin Templeton's Franklin OnChain U.S. Government Money Fund, ticker FOBXX or BENJI, was the first SEC-registered fund to use a public blockchain for transfer-agency record-keeping — launched April 2021 on Stellar, expanded to Polygon, Arbitrum, Avalanche, Aptos, Solana, Base and Ethereum. Operated by Franklin Templeton Digital Assets, BENJI's distinguishing features are: (a) an existing '40 Act fund structure (vs. BUIDL's Reg D private fund), (b) a US$20 minimum (vs. BUIDL's US$5M), and (c) the Benji consumer app for retail-accredited access. By mid-2026 BENJI holds approximately US$2B AUM (rwa.xyz). The 2025 Franklin-Ondo deal to trade ETFs around the clock via Ondo tokenization extends the rails further.

Ondo OUSG and BENJI

Ondo OUSG holds BUIDL + BENJI as its underlying — a wrapper-of-wrappers — but offers DeFi composability that BUIDL itself cannot (because BUIDL is whitelist-restricted to qualified purchasers). Ondo has positioned OUSG as the "de facto institutional tokenized Treasury for accredited investors who want DeFi rails." USDY extends the same yield to non-US permissionless users.

Superstate USTB and USCC

Superstate, founded by Compound creator Robert Leshner, launched USTB (Short Duration U.S. Government Securities Fund) in early 2024 as an SEC-registered '40 Act fund with on-chain ownership records. USCC (Crypto Carry Fund) layers in cash-and-carry strategies for accredited investors. USTB targets US qualified-purchaser money — a different niche from BUIDL's institutional minimum.

Circle USYC (acquired from Hashnote January 2025)

Hashnote launched USYC (Hashnote International Short Duration Yield Fund) as an offshore-domiciled tokenized MMF favored by crypto-native institutions. Circle acquired Hashnote and the USYC product in January 2025, making USYC the cornerstone of Circle's yield strategy. USYC is now Circle USYC and serves as collateral for Circle's CFTC-regulated derivatives venues alongside USDC. By 2026 USYC sits alongside BUIDL as a top-tier institutional yield primitive, with the additional advantage of an integrated USDC mint/burn rail at Circle.

Mountain USDM

Mountain Protocol, a Bermuda-licensed issuer, launched USDM — a permissioned yield-bearing stablecoin backed by Treasuries — and was acquired by Anchorage Digital in May 2025. Following the acquisition, USDM was wound down (minting disabled May 2025; wind-down completed August 2025), so it is no longer an active competitor.

OpenEden TBILL, HYBOND, USDO

OpenEden is the leading APAC tokenized Treasury issuer, with the BVI-domiciled, MAS-recognized TBILL Fund, the HYBOND corporate-bond fund, and the USDO yield-bearing stablecoin. OpenEden is the leading example of a tokenized Treasury structure built around an Asia-friendly regulatory perimeter.

VanEck VBILL

VanEck launched the VanEck Treasury Fund (VBILL) in 2025 — a tokenized MMF that brings a major US ETF brand into the on-chain Treasury market, distributed primarily through Securitize.

Spiko EUTBL / USTBL

Spiko operates EUTBL and USTBL — MiCA-aligned EU and US T-bill money market funds that target French and German institutional investors. Spiko's protocol is built on a permissioned-but-EU-regulated stack.

Matrixdock STBT and XAUm

Matrixdock, the RWA arm of Matrixport, operates STBT (Short-Term Treasury Bill Token, the first major Asian tokenized T-bill product) and the XAUm gold token. STBT was an earlier-generation tokenized Treasury that has been partially eclipsed by the BUIDL/USYC institutional wave but remains a significant Asia-focused vehicle.

Larry Fink and the tokenization thesis

BlackRock CEO Larry Fink has made tokenization a centerpiece of his public commentary since 2023. In his 2024 annual letter Fink wrote: "The next generation for markets, the next generation for securities, will be tokenization of securities." In subsequent CNBC, Bloomberg, and Davos appearances he expanded the thesis: tokenization enables instant settlement (replacing T+1 / T+2 cycles), 24/7 markets, fractional access to traditionally institutional-only assets (private equity, private credit), and operational cost reduction through programmable compliance.

The internal logic of BlackRock's tokenization push runs along three lines:

1. Defensive: if BlackRock does not own the rails of a future on-chain capital market, a competitor or a crypto-native firm will. Owning the institutional standard at issuance time is a strategic moat.
2. Offensive: tokenization opens up illiquid private markets (PE, private credit, real estate) to a broader investor base, expanding BlackRock's addressable AUM.
3. Operational: 24/7 settlement and programmable money-management primitives reduce cost across the firm.

Fink's view has been echoed by Franklin Templeton (Roger Bayston, Sandy Kaul), JPMorgan (Onyx, now Kinexys), HSBC (Orion), Citi, and Goldman Sachs (DAP). The 2024-2026 institutional consensus treats tokenization as a foundational infrastructure shift, not a crypto novelty.

The 2026 RWA market state

As of mid-2026, the tokenized real-world asset market totals roughly US$30-35B AUM (rwa.xyz counted ~$34.5B, roughly doubling year-over-year), of which:

• Tokenized US Treasuries and money market funds: ~US$15B across 76 products (rwa.xyz, Q2 2026) — the largest category: USYC ~US$2.9B, BUIDL ~US$2.6B, USDY ~US$2.1B, BENJI ~US$2.1B, Centrifuge JTRSY ~US$1.2B, OUSG ~US$0.6B, plus dozens of others.
• Tokenized private credit: ~US$10-12B (Centrifuge, Maple, Goldfinch, Clearpool, TrueFi).
• Tokenized funds (PE, hedge funds, alternatives): ~US$2-3B (Apollo ACRED, Hamilton Lane, KKR feeders).
• Tokenized commodities: ~US$1.5B (PAXG, XAUt, XAUm).
• Tokenized equities: ~US$0.5B (Backed bShares, Dinari dShares).
• Tokenized bonds (sovereign and supranational): ~US$1B (EIB, HSBC Orion, Slovenia, Hong Kong).
• Tokenized real estate: smaller and fragmented.

The category is small in absolute terms but growing fast. Industry forecasts:

• BCG / Ripple — Approaching the Tokenization Tipping Point (2025): US$16T by 2030 in the high-adoption scenario; the Distributed Tokenized RWA Market to Hit $400B by 2030 — Keyrock, Securitize report is a more conservative midpoint.
• McKinsey — From Ripples to Waves (2024): US$2T by 2030 excluding stablecoins.
• Citi — Money, tokens, and games (2023): US$5T tokenized by 2030.
• DTCC — building dedicated tokenization business line within clearing: signal of legacy-clearing-house adoption (DTCC creates dedicated tokenization business line).

The ECB Director's recent remarks on tokenization and the IMF tokenization paper signal that international supervisory bodies are now actively engaged with the topic. UniCredit's €4M investment in tokenization firm BlockInvest marks European tier-1 bank involvement.

Comparison: top tokenized treasury products

BUIDL vs stablecoin yield (USDe sUSDe, USDY)

A natural question for the 2026 reader: how does BUIDL compare to crypto-native yield-bearing dollar instruments? Three primary alternatives exist:

• Ethena USDe / sUSDe — USDe is a synthetic dollar from Ethena Labs collateralized by ETH (and BTC) perp short positions, capturing the "basis trade" yield. sUSDe is the staked, yield-bearing version. Yield is variable (often 10-20% during high-funding markets, 5-7% in calm markets) and depends on perp-funding rates being positive. Risk profile: market risk (negative funding), counterparty exchange risk, operational risk. Not regulated as a security. As of 2026, sUSDe sits at ~US$5B+ supply.
• Ondo USDY — permissionless, retail-accessible (non-US) yield-bearing note backed by Treasuries plus bank deposits. Yields ~4-5%, but distributed by Ondo Finance under non-US securities exemption.
• BUIDL — institutional-only, US$5M minimum, 4-5% MMF yield, regulated security in the US.

The takeaway: BUIDL is the regulated, institutional benchmark; USDe is the DeFi-native yield carry with very different risk; USDY is the retail-accessible compromise. In 2026 the three coexist and serve overlapping but distinct user bases.

The 2025 Morgan Stanley Targets BlackRock With Money Market Fund for Stablecoin Issuers is significant because it confirms that traditional banks now compete directly with BlackRock for the stablecoin-reserve business — a market BUIDL has been quietly capturing for two years.

Risks and criticism

Despite the institutional credibility, BUIDL and the broader tokenized-Treasury market face four principal risks:

1. Concentration risk. BUIDL, USYC, BENJI and OUSG together control a large share of the on-chain Treasury market and underpin many stablecoins (USDtb) and DeFi reserve allocations (Frax, Sky, Ondo). A single operational failure at Securitize, BNY Mellon, or the BlackRock fund-administrator stack could propagate widely. The Hashnote/USYC acquisition by Circle further concentrated on-chain Treasury yield issuance into a small number of issuers.
2. Regulatory risk. BUIDL is a regulated security under US law; the rules can change. SEC posture has shifted significantly between 2023 and 2026, and a future enforcement environment could constrain DeFi integration of regulated security tokens.
3. Smart contract and bridge risk. Multichain BUIDL deployments rely on chain-native contracts and (in some flows) cross-chain bridges. A major bridge exploit affecting one of the multichain deployments could trigger contagion.
4. Yield-curve risk. BUIDL's yield tracks short-duration Treasuries. If the Fed cuts rates aggressively (as in late 2024 and 2025), BUIDL yields fall, weakening the "regulated yield" thesis vs. crypto-native alternatives.

A subtler risk: BUIDL's growth depends on accredited-investor demand. If the SEC or another regulator opens accredited-investor access (a frequently-discussed reform), or alternatively if accredited demand saturates, growth slows. The 2026 IMF tokenization paper explicitly raises the systemic-stability question: a stablecoin like USDtb that is fully BUIDL-backed inherits BlackRock's operational tail risk, and if BUIDL has a bad day, the whole stack does.

How to access BUIDL exposure (institutional and retail paths)

Institutional path (qualified-purchaser, US$5M minimum)

1. Establish a Securitize account: complete KYC, verify QP/accredited status, sign the subscription agreement.
2. Wire fiat to the fund custodian (BNY Mellon).
3. Securitize whitelists your wallet on each chain you intend to receive BUIDL on (Ethereum, Aptos, etc.).
4. Receive BUIDL tokens.
5. Use BUIDL as: pure cash management (passive yield), cross-chain treasury management, prime-broker margin (FalconX), DeFi collateral via institutional venues like Aave Horizon RWA.
6. Redeem via Securitize for fiat (T+0/T+1) or via Circle for USDC (1:1 instant, depending on liquidity tier).

Retail / DeFi path (BUIDL exposure without holding BUIDL)

1. Frax sFRAX: stake FRAX into sFRAX; receive yield partially derived from BUIDL.
2. Sky / Spark sUSDS: hold sUSDS; receive Sky Savings Rate (SSR) partially derived from BUIDL allocator.
3. Ethena USDtb: hold USDtb directly (where available); the stablecoin is BUIDL-backed.
4. Ondo OUSG (accredited only) or Ondo USDY (non-US retail): hold for direct exposure to a BUIDL+BENJI underlying.
5. BounceBit Prime, Ondo Global Markets: holders gain BUIDL-class yield via CeDeFi yield vaults.

For non-US retail, USDY is the closest direct substitute (USDM was wound down in 2025). For European retail, Spiko EUTBL is the cleanest MiCA-aligned access.

Research and reports

The BUIDL/RWA literature has matured rapidly:

• Distributed Tokenized RWA Market to Hit $400B by 2030 — Keyrock, Securitize — 2026 industry forecast.
• Morgan Stanley Targets BlackRock With Money Market Fund for Stablecoin Issuers — bank competitive landscape.
• ECB Director: tokenization gains unmatched by previous waves of tech change — central-bank perspective.
• IMF charts cautious tokenization path amid US permissionless push — IMF tokenization paper.
• Securitize to be first digital transfer agent for NYSE tokenized securities platform — Securitize's NYSE integration.
• Franklin Templeton ETFs to trade around the clock via Ondo tokenization deal — Franklin-Ondo partnership.
• DTCC creates dedicated tokenization business line within its clearing division — legacy-clearing pivot.
• UniCredit invests €4m in tokenization firm BlockInvest — European tier-1 bank involvement.

BCG's Approaching the Tokenization Tipping Point (2025, with Ripple), McKinsey's From Ripples to Waves (2024), Bain's RWA opportunity series, and Citi's Money, tokens, and games (2023) remain the canonical industry forecasts.

FAQ

What is BlackRock BUIDL?

BUIDL is the BlackRock USD Institutional Digital Liquidity Fund, a tokenized money market fund launched 20 March 2024 on Ethereum and expanded on 13 November 2024 to Aptos, Arbitrum, Avalanche, Optimism and Polygon. It holds roughly US$2.6B AUM in mid-2026 — the flagship tokenized Treasury fund, running neck-and-neck with Circle’s USYC for the top spot — anchored by Securitize as transfer agent and BNY Mellon as custodian.

When did BlackRock BUIDL launch?

BUIDL launched on Ethereum on 20 March 2024 with US$100M of seed capital. It expanded to a multichain footprint on 13 November 2024, deploying simultaneously on Aptos, Arbitrum, Avalanche, Optimism and Polygon — bringing total chain coverage to six.

How does BUIDL pay yield?

BUIDL accrues yield daily and pays it out as additional BUIDL tokens minted directly to investors' wallets each business day. The yield reflects the underlying Treasury bill, repo, and cash returns minus the BlackRock management fee — typically tracking the SOFR overnight rate within a few basis points.

Who can buy BUIDL?

BUIDL is restricted to qualified purchasers and accredited investors with a US$5M minimum subscription. Distribution flows through Securitize Markets and select institutional placement agents. Retail investors cannot buy BUIDL directly but can access BUIDL-backed exposure through Ondo OUSG, Ethena USDtb, and Frax sFRAX.

What is Securitize and what role does it play?

Securitize is the SEC-registered transfer agent, broker-dealer, and tokenization platform that issues and operates BUIDL on-chain. Founded by CEO Carlos Domingo, Securitize is also the issuer-of-record for Apollo ACRED, KKR HCSI, Hamilton Lane SCOPE and dozens of other institutional tokenized assets. BlackRock invested in Securitize in 2024.

How is BUIDL used as collateral?

BUIDL has become the dominant tokenized-Treasury collateral in DeFi and CeFi: Frax sFRAX wraps BUIDL as a yield-bearing reserve; Sky / MakerDAO via Spark uses BUIDL in its allocator; Ethena's USDtb stablecoin is backed by BUIDL; FalconX accepts BUIDL as margin collateral; BounceBit Prime uses BUIDL in its CeDeFi vaults; Ondo OUSG holds BUIDL plus BENJI as its underlying.

Who are BUIDL's main competitors?

BUIDL's competitors include Circle's USYC (~US$2.9B, acquired from Hashnote in January 2025), Ondo USDY (~US$2.1B) and OUSG, Franklin Templeton's BENJI/FOBXX (~US$2.1B), Superstate USTB, OpenEden TBILL, VanEck VBILL, Spiko EUTBL/USTBL, and Matrixdock STBT (Mountain's USDM was wound down in 2025). The total tokenized-Treasury market is roughly US$15B in mid-2026 per rwa.xyz.

What did Larry Fink say about tokenization?

BlackRock CEO Larry Fink wrote in his 2024 annual letter that "the next generation for markets, the next generation for securities, will be tokenization of securities." He has framed tokenization as the path to instant settlement, broader market access, and reduced operational cost in financial markets — and BUIDL is BlackRock's first concrete on-chain implementation of that thesis.

How big is the RWA market in 2026?

The total real-world-asset tokenization market is approximately US$30-35B AUM in mid-2026 (rwa.xyz counted ~$34.5B), of which tokenized Treasuries are ~US$15B — the largest category. BlackRock BUIDL alone is roughly US$2.6B. Industry estimates from BCG, McKinsey, Citi, and Bain project the market reaching US$2-16T by 2030 depending on adoption scenario.

Why does BUIDL matter for DeFi?

BUIDL is the institutional-grade bridge that makes DeFi credible to traditional finance. It gives stablecoin issuers a regulated yield-bearing reserve asset, gives lending protocols a low-volatility collateral type, and gives DAOs and treasuries a way to hold productive cash on-chain. BUIDL has materially shifted DeFi away from purely-crypto collateral and toward a hybrid stack with regulated short-duration fixed-income at the base.

Glossary

• BUIDL — BlackRock USD Institutional Digital Liquidity Fund.
• Tokenized Treasury — a blockchain token representing equity in a money market fund or direct Treasury exposure.
• MMF (Money Market Fund) — a regulated fund holding short-duration, high-quality cash equivalents.
• Transfer agent — the SEC-registered party that maintains the official shareholder register.
• Qualified purchaser — an investor under SEC rule 2(a)(51) with US$5M+ in investments.
• Accredited investor — an investor under SEC rule 501; broader than QP.
• Reg D 506(c) — exemption permitting private placement to accredited investors with general solicitation.
• Daily mint distribution — yield paid by minting new tokens directly to holders' wallets.
• NAV (Net Asset Value) — the per-share value of a fund.
• Securitize — SEC-registered transfer agent and broker-dealer powering BUIDL and most institutional tokenized funds.

Related reading

• Real-World Asset Tokenization 2026 guide
• Stablecoins Explained 2026 guide
• What is DeFi? 2026 guide
• What is Ethereum? 2026 guide
• Best Crypto ETFs 2026 guide
• CBDC 2026 guide

Sources and further reading

• BlackRock BUIDL fund page — https://www.blackrock.com/us/individual/products/333062/buidl-fund
• Securitize — https://securitize.io/
• BNY Mellon — https://www.bnymellon.com/
• Franklin Templeton BENJI / FOBXX — https://www.franklintempleton.com/
• Ondo Finance — https://ondo.finance/
• Superstate — https://www.superstate.com/
• OpenEden — https://www.openeden.com/
• Matrixdock — https://www.matrixdock.com/
• Ethena Labs — https://ethena.fi/
• Spiko — https://www.spiko.io/
• Circle USYC — https://www.usyc.com/
• US Treasury — https://home.treasury.gov/
• BlackRock 2024 annual letter — https://www.blackrock.com/corporate/investor-relations/larry-fink-annual-chairmans-letter
• BCG / Ripple — Approaching the Tokenization Tipping Point — https://www.bcg.com/
• McKinsey — From Ripples to Waves — https://www.mckinsey.com/
• Citi — Money, tokens, and games — https://www.citigroup.com/
• DTCC tokenization — https://www.dtcc.com/
• IMF tokenization paper — https://www.imf.org/
• rwa.xyz — Tokenized U.S. Treasuries dashboard (live AUM per fund) — app.rwa.xyz/treasuries
• Bitcoin.com News — BlackRock's tokenized funds hit $2.93B onchain (2026) — news.bitcoin.com
• CoinDesk — BlackRock deepens tokenization push with new onchain fund offerings (May 2026) — coindesk.com
• The Block — Ethena's USDtb, backed by BlackRock's BUIDL, goes live (Dec 2024) — theblock.co
• Mountain Protocol — USDM wind-down overview (2025) — docs.mountainprotocol.com

About the author

DeFi Intel Research covers institutional crypto, tokenization, and DeFi credit markets. Our analysts read every BlackRock annual letter, monitor on-chain BUIDL flows, and publish independent research on the tokenized-Treasury landscape, RWA collateral integration, and the evolving institutional bridge between traditional finance and DeFi.

Last updated: 2026-07-15