BUIDL
Executive Summary
BUIDL: the category benchmark. BlackRock USD Institutional Digital Liquidity Fund Ltd. was the first tokenized money-market-equivalent fund to cross $1B, and it remains the largest by AUM at $2.47BSource: RWA.xyz cross-chain total AUM across 8 chains. Launched 20 Mar'24, BUIDL set the template the tokenized Treasury category has since followed — Reg D 3(c)(7) offering, Securitize transfer agent, BNY Mellon custody, stable $1.00 NAV with daily in-kind distribution, 101 institutional holders concentrated in Ethereum, Solana, and BNB Chain. Portfolio composition is T-bills, cash, and Treasury-collateralized repo; investment objective is current income consistent with liquidity and stability of principal. 7-day APY 3.47% gross, ~2.97% net of the 50bps management fee.
- Set the category standard. When BUIDL launched in March 2024 there was no established template for a Big-4-class tokenized Treasury product. BUIDL defined the Reg D 3(c)(7) plus Securitize plus BNY Mellon stack that VBILL and other institutional-tier peers have since replicated. Many of the structural features we now consider baseline — daily mint distribution, Circle USDC atomic redemption, multi-chain deployment, ATS secondary market — were first productionized at scale by BUIDL.
- Tiered fee structure. Management fee ranges from 20bps (Aptos, Avalanche, Polygon) to 50bps (Ethereum primary). The Ethereum-anchor 50bps tier reflects the first-mover position; the lower fee tiers on newer chains reflect competitive pressure from peers like VBILL (20bps) and BENJI (15bps). The tiered schedule is unique in the peer set — most competitors price uniformly across chains.
- Instant USDC redemption via Circle partnership. Since April 2024, BUIDL holders have been able to swap shares for USDC 1:1 through a Circle smart contract. This was the first 24/7 stablecoin off-ramp for a tokenized Treasury product at institutional scale. RLUSD atomic-swap was added September 2025 via the Ripple-Securitize partnership. Aave Horizon collateral eligibility followed as part of the Horizon launch in August 2025.
- Rating: Low Risk. BlackRock's operational pedigree ($11.5T firm AUM), BNY Mellon custody, Securitize TA with two years of production track record under BUIDL specifically, and the deepest institutional holder base in the category (101 addresses) all support the Low rating. The single residual-risk factor worth flagging is fee concentration — BUIDL's 50bps Ethereum tier is the highest in the peer set and creates a rational-arbitrage case for institutions to migrate to VBILL or USTB if fee is the primary factor.
Positioning. BUIDL is the name brand in tokenized Treasuries — allocator mandates at institutional funds often default to BUIDL as the first listed position. Its 35x size advantage over VBILL (same structure, cheaper fee) reflects the brand and first-mover premium more than product-level differentiation. In a sub-250M-AUM head-to-head against VBILL or USTB, BUIDL's economics are worse on fee; above $500M, BUIDL's liquidity depth and integration footprint dominate.
Portfolio & Backing
Investment mandate. The fund holds US Treasury bills, cash, and repurchase agreements collateralized by US Treasury obligations. Investment objective as stated in the PPM: “seek current income as is consistent with liquidity and stability of principal.” Portfolio management operates on money-market-fund-equivalent parameters — short duration, high credit quality, daily liquidity — though BUIDL itself is a private fund under Regulation D rather than a registered 40-Act money-market fund.
Custody architecture. Fund assets are custodied at The Bank of New York Mellon — the largest global custodian bank with ~$55 trillion under custody. Custody is off-chain through institutional account structures; on-chain BUIDL tokens represent digital claims on the book-entry fund position, not direct on-chain reserves. BlackRock Financial Management Inc. is the investment manager.
Daily mint distribution. BUIDL maintains a permanent $1.00 per-token NAV. Portfolio yield accrues daily and is paid to holder wallets by minting new BUIDL tokens pro-rata at $1.00 each. A wallet holding 1,000,000 BUIDL at the start of a 30-day period will hold approximately 1,000,245 BUIDL at the end of that period at current ~3% net yields. This is the rebasing-supply model that VBILL later adopted; it differs from accumulating-NAV designs like USTB and JTRSY.
Chain-level supply distribution (Mar'26). Ethereum $793M, Solana $533M, BNB Chain $505M, Aptos $265M, Avalanche $82M, Arbitrum $27M, Optimism $26M, Polygon $8M. Ethereum is the largest single chain but holds less than a third of total AUM — the cross-chain distribution reflects institutional capital allocating where fees and speed matter most.
Product Characteristics
Subscription. An approved Qualified Purchaser sends USDC to the Securitize platform. Securitize mints BUIDL tokens 1:1 at $1.00 NAV and delivers them to the investor's whitelisted wallet. The subscribed USDC routes through Circle to BlackRock's custody account at BNY Mellon, where cash is deployed into the T-bill portfolio. Minimum subscription is $5,000,000 — the highest in the peer set, reflecting BUIDL's positioning as an institutional-only product.
Redemption — three paths. (1) Securitize primary market: submit a redemption request, BUIDL tokens burn, USDC settles back through Circle. Historically this was T+5; since April 2024 the Circle partnership enables 24/7 T+0 settlement for standard redemptions. (2) Circle atomic swap: single on-chain transaction exchanges BUIDL for USDC at 1:1 against Circle's liquidity, no wait. This was the first institutional-grade stablecoin off-ramp for a tokenized Treasury. (3) Ripple RLUSD smart-contract swap: 24/7 atomic exchange of BUIDL for RLUSD, announced September 2025 as part of the same Ripple-Securitize partnership that covers VBILL.
Secondary market. Whitelisted holders can post buy/sell orders on the Securitize ATS — SEC-registered Alternative Trading System. Unverified addresses cannot receive BUIDL. At $2.47B AUM across 101 holders, BUIDL has the deepest secondary-market liquidity of any tokenized Treasury but the ATS is still thin relative to primary-market flows; most activity is subscription/redemption rather than secondary.
Daily in-kind token mint. Portfolio yield is paid to holders each day by issuing new BUIDL tokens pro-rata. At 3.47% gross 7-day APY and 50bps fee, net yield is approximately 2.97% annualized on the Ethereum primary tier. Lower-fee chains (Aptos, Avalanche, Polygon at 20bps) offer net ~3.27%. The token-mint mechanic means integrators always display BUIDL at $1.00 per token; yield accrues as token-count growth, not price appreciation.
8 chains live. Ethereum (primary, 50bps), Solana, BNB Chain, Aptos, Avalanche, Arbitrum, Optimism, Polygon. Each chain has its own BUIDL contract with whitelist-compliance layer enforced at the token level. The fund itself is a single BVI legal entity; chain-level token supply represents pro-rata ownership of the consolidated underlying portfolio. Securitize operates the issuance on each chain.
Fee tiering by chain is the unique feature: 50bps Ethereum, 20bps on Aptos, Avalanche, and Polygon. This is BlackRock's competitive response to VBILL's uniform 20bps pricing — lower-fee chain deployments compete on economics while the Ethereum primary tier captures the brand premium. No cross-chain bridge in the traditional sense — each chain is its own issuance, with investors moving between chains via primary-market redeem-and-reissue.
U.S. Qualified Purchasers only. BUIDL is offered under Section 3(c)(7) of the Investment Company Act, which restricts ownership to Qualified Purchasers — individuals with ≥$5M of investments and entities with ≥$25M. $5M minimum subscription effectively floors investor size well above the QP threshold, making BUIDL an institutional-treasury product rather than a high-net-worth individual product. Non-US investors can subscribe through the same Securitize channel if they meet equivalent accreditation standards.
KYC through Securitize. All investor onboarding routes through Securitize's KYC/AML platform. Once approved, the investor's wallet is added to the transfer whitelist on each chain they want to hold BUIDL. Tokens can only move between verified addresses. Transfer compliance is enforced at the smart-contract level.
Risk Analysis
We rate BUIDL as Low Risk across all five factors. BlackRock's operational pedigree, BNY Mellon custody, the two-year production track record of the Securitize stack, and $2.47B AUM distributed across 101 institutional holders all support the lowest-risk rating tier. The single residual risk worth flagging is fee — the 50bps Ethereum tier creates rational allocator pressure toward lower-fee peers; if that migration accelerates, BUIDL's scale advantage could compress.
What it is. Exposure to the US Treasury bill portfolio and Treasury-collateralized repo book custodied at BNY Mellon.
Mitigants. Portfolio restricted to US government obligations and Treasury-collateralized repo — no corporate credit, no non-US sovereign, no agency paper. Money-market-fund-equivalent duration discipline (short remaining maturity, daily liquidity). BNY Mellon as custodian is the largest global custody bank; segregation from BlackRock corporate balance sheet is standard. PwC as fund auditor provides Big-4 annual audit.
Residual risk. Repo counterparty concentration is not publicly disclosed in portfolio-level detail; in a stressed repo scenario, specific counterparty delays could affect settlement even though the underlying collateral is USG. CUSIP-level portfolio detail is access-gated to investors through the PPM.
What it is. Risk that a holder cannot redeem at NAV within a reasonable timeframe.
Mitigants. Three redemption paths: Securitize primary market (USDC, T+0 via Circle since Apr'24), Circle atomic swap, Ripple RLUSD swap. Aave Horizon collateral eligibility provides borrowing against the position. The Circle USDC integration specifically is the category-defining liquidity feature — no peer matched it for nearly 12 months after launch.
Residual risk. Large redemption waves still funnel through Circle's USDC liquidity; a Circle-specific stress event could delay T+0 settlement and push users to primary-market paths with longer settlement cycles. Secondary market on Securitize ATS is thin relative to fund size; a $100M+ exit would require primary-market rather than secondary execution.
What it is. Fund-operation concentration, multi-role service providers, off-chain settlement processes.
Mitigants. BlackRock is the world's largest asset manager at ~$11.5T firm AUM; institutional rigor across investment management, compliance, and disclosure is among the highest in finance. BNY Mellon custody provides operational segregation. PwC audit gives Big-4 independence. Securitize has two years of production track record running BUIDL at scale with no publicly disclosed incidents. Debevoise & Plimpton as legal counsel is a top-tier fund-formation firm.
Residual risk. Securitize operates transfer agent, fund administrator, broker-dealer (Securitize Markets, LLC), and ATS simultaneously — the same vendor-concentration pattern flagged for VBILL applies to BUIDL. A Securitize outage would impair subscription, redemption, and secondary trading. BlackRock's own operational rigor partially offsets this; a Securitize incident would likely be managed through pre-arranged failover with BlackRock's internal infrastructure.
What it is. Track record, stress-test history, holder base concentration.
Mitigants. BUIDL has been live ~25 months at $2.47B AUM across 101 holders on 8 chains. The fund has operated through multiple crypto-market dislocations including the Jan'25 correction and Oct'25 $19B liquidation cascade without NAV deviation or redemption gating. The category-leading AUM, the product-defining position (first tokenized Treasury fund at institutional scale), and the 25-month operating history collectively represent the deepest track record in the tokenized Treasury segment.
Residual risk. 25 months is short by TradFi institutional standards. Holder concentration is high (101 addresses holding $2.47B implies average position ~$24M) — a single large redemption from a top holder could produce meaningful portfolio rebalancing activity. The Ethena USDtb backing relationship, where USDtb is partially backed by BUIDL, creates an indirect correlation to Ethena's own stability.
What it is. Defects in the BUIDL token contracts, Securitize's transfer-restriction layer, or the Circle/Ripple redemption contracts.
Mitigants. Securitize's production stack has been running BUIDL for 25+ months without incident. Whitelist-restricted transfers at the token level limit attack surface — even a token-drain exploit can only move assets to pre-verified addresses. Circle and Ripple redemption contracts are operated by regulated, audited stablecoin issuers. BlackRock's operational risk framework adds Big-3-manager controls on top of the Securitize stack.
Residual risk. Multi-chain deployment increases the surface area — 8 separate token contracts each require ongoing monitoring. No public per-contract audit reports surface through Securitize's standard disclosure. The Circle redemption contract, while operated by Circle, is an additional third-party dependency for the T+0 liquidity path.
Peer Positioning
BUIDL is the largest tokenized Treasury product and the category benchmark. Peer table (AUM, yield, fees as of April 2026; source RWA.xyz).
| Fund | Issuer | AUM | Yield | Fee | Min | Chains |
|---|---|---|---|---|---|---|
| BUIDL | BlackRock | $2.47B | 3.47% | 20-50 bps | $5M | 8 |
| USYC | Circle / Hashnote | $2.67B | 3.15% | 0% + perf | $100K | 11 |
| USDY | Ondo | $1.88B | 3.55% | 0% | $100K | 11 |
| JTRSY | JH + Anemoy | $1.40B | 3.45% | 25 bps | $100K | 7 |
| BENJI | Franklin | $993M | 3.51% | 15 bps | $20 | 9 |
| USTB | Superstate | $659M | 3.45% | 15 bps | $100K | 3 |
| VBILL | VanEck | $68M | 3.45% | 20 bps | $100K-$1M | 4 |
Where BUIDL wins. Scale. At $2.47B AUM, BUIDL is 35x larger than VBILL and 4x larger than USTB. Holder depth (101 addresses) is 3-7x most peers. Chain coverage (8) is broad. Circle USDC T+0 redemption is production-proven through multiple stress events. BlackRock brand is the strongest institutional trust anchor in the segment. Aave Horizon and Ripple RLUSD integrations were first or co-first to market.
Where BUIDL loses. Fee. The 50bps Ethereum tier is 230-330% of the lowest-fee peers (USTB and BENJI at 15bps). The tiered structure (20-50bps) adds complexity versus flat-fee peers. $5M minimum is the highest in the segment, restricting access to the largest allocators — VBILL's $100K-$1M and USTB's $100K minimums invite smaller institutional participants. No retail path (unlike BENJI via its 40-Act structure).
Strategic position. BUIDL is the institutional-default tokenized Treasury. Most allocator mandates that mention tokenization default to BUIDL as the listed position. Its scale advantage is a strong moat for now, but rational fee-conscious capital has pressure to migrate to VBILL (same structure, better fee) or USTB (different structure, better fee). The tiered chain-level fees are BlackRock's response to this pressure on newer chains. Expect continued AUM growth absolute but share loss as the category scales overall.
Holder Analysis
BUIDL's holder base is 101 institutional addresses across 8 chains. The Ethereum deployment holds approximately $150M of $2.47B total AUM — less than a third. The table below shows the top-10 holders on Ethereum specifically. Note that BUIDL's broader holder base (Solana, BNB Chain, Aptos) is larger than the Ethereum-specific slice.
| # | Address · Label | Balance | % of Supply |
|---|---|---|---|
| Fetching live holder data from Ethplorer + Alchemy... | |||
Reading the distribution. BUIDL's holder base is concentrated in institutional omnibus wallets, custodied stablecoin protocol reserves (notably Ethena's USDtb and Ondo's structured products), and DeFi-integration contracts (Aave Horizon). The low direct-holder count understates the effective beneficiary base — every $1 of USDtb issued against BUIDL collateral represents an end-investor with indirect exposure, and every $1 borrowed against BUIDL on Aave Horizon represents a borrower's position. Actual economic exposure to BUIDL is several multiples of the 101-address direct holder count.
DeFi Integrations
The category-defining integration. Since April 2024, BUIDL holders can redeem at NAV by sending BUIDL tokens to a Circle-operated smart contract and receiving USDC in the same block. This was the first 24/7 institutional-scale stablecoin off-ramp for a tokenized Treasury product. It set the operational standard that VBILL later adopted (Agora AUSD, Ripple RLUSD) and remains the most-battle-tested tokenized-Treasury-to-stable path in production.
Ethena uses BUIDL as a reserve asset backing its USDtb stablecoin (distinct from Ethena's basis-trade USDe). This is one of the largest tokenization-driven capital flows in the category — Ethena accumulates USDC through standard stablecoin minting, converts it to BUIDL for yield capture, and uses BUIDL as the underlying reserve for USDtb. The USDtb-BUIDL relationship flows significant AUM to BlackRock's fund. Risk: Ethena stress would create BUIDL redemption pressure.
BUIDL was added to Aave Horizon as a launch collateral asset. Institutional borrowers can pledge BUIDL and borrow USDC, GHO, or RLUSD against it. Horizon is permissioned — both the collateral and the borrower must pass KYC/AML. Integration provides a fourth exit path for BUIDL holders (borrow rather than redeem) and extends BUIDL's utility as working-capital collateral for institutional DeFi.
Announced September 2025 as part of the Ripple-Securitize partnership covering both BUIDL and VBILL. 24/7 atomic swap of BUIDL for RLUSD via a dedicated smart contract. Adds redundancy to the Circle USDC primary path.
SEC-registered Alternative Trading System operated by Securitize Markets, LLC. Whitelisted holders can post buy/sell orders; provides regulated secondary liquidity for institutional investors who want to exit before standard redemption settlement. Thin relative to the fund's size, but provides a secondary venue outside the primary-market redemption path.
Appendix · Contracts & Infrastructure
| Chain | Contract | Standard | AUM (Mar'26) |
|---|---|---|---|
| Ethereum | 0x7712c342…aa2aec | ERC-20, 6 dec | $793M |
| Solana | See Solscan | SPL Token | $533M |
| BNB Chain | See BSCScan | BEP-20 | $505M |
| Aptos | See Aptoscan | Aptos coin | $265M |
| Avalanche C-Chain | See Snowtrace | ERC-20 | $82M |
| Arbitrum | See Arbiscan | ERC-20 | $27M |
| Optimism | See Optimistic Etherscan | ERC-20 | $26M |
| Polygon | See PolygonScan | ERC-20 | $8M |
Chain-level contract addresses beyond Ethereum are accessible through each chain's explorer via Securitize's BUIDL fund page. Verify on-chain before use.
| Role | Entity |
|---|---|
| Issuer | BlackRock USD Institutional Digital Liquidity Fund Ltd. (BVI) |
| Investment Manager | BlackRock Financial Management Inc. |
| Custodian | The Bank of New York Mellon (BNY Mellon) |
| Transfer Agent | Securitize, LLC (SEC-registered) |
| Fund Administrator | Securitize Fund Services |
| Broker-Dealer / ATS | Securitize Markets, LLC (SEC-registered) |
| Auditor | PricewaterhouseCoopers LLP |
| Legal Counsel | Debevoise & Plimpton LLP |
| USDC Off-ramp | Circle Internet Financial |
| RLUSD Off-ramp | Ripple / Securitize smart contract |
Live data: RWA.xyz · Securitize fund page: securitize.io · Launch PR (20 Mar'24): BlackRock press release · Circle USDC integration (Apr'24): Circle blog · Ripple RLUSD (Sep'25): Ripple press · Aave Horizon: Aave blog. CUSIP-level portfolio and PPM are access-gated through Securitize onboarding.