Securitize is the tokenisation issuance platform, SEC-registered transfer agent, and broker-dealer that runs the on-chain plumbing for BlackRock's BUIDL fund and a growing share of the institutional tokenised-fund market in the United States. It functions as the registered intermediary between the regulated fund wrapper and the on-chain instrument: KYC, the smart-contract whitelist, the share register kept on-chain through whitelisted addresses, and primary issuance and redemption rails for permissioned tokenised securities. For a tokenisation operator on the asset-management side, Securitize is the most-cited example of how to run a US-regulated tokenised fund end-to-end without touching the unrestricted public-chain DEX surface, and the partner asset managers reach for when the issuance and transfer-agency stack needs to be ready before product launch.
What it is
Securitize sits in three regulated wrappers stacked on the same operating company. First, Securitize LLC, the SEC-registered transfer agent, which is the legal record of share ownership for the funds it services. Second, Securitize Markets, the broker-dealer and ATS (alternative trading system) registrations, which handle primary distribution and a venue for permissioned secondary trading. Third, the technology platform itself, which issues the on-chain token contracts, runs the KYC and whitelist gating, and exposes the operating-side APIs to fund administrators and custodians. The combination is what allows a fund like BUIDL to keep its share register on-chain through whitelisted addresses rather than at a traditional registrar, while remaining fully inside the US fund-regulation perimeter.
The company is not a custodian in the qualified-custodian sense. Custody of the underlying fund assets sits with traditional custodians (BNY for BUIDL); custody of the tokenised share interest sits with whatever wallet the whitelisted holder chooses, which can be a self-custody wallet, an institutional custody platform, or in some configurations Coinbase Custody or Anchorage Digital Bank.
Operating model
Securitize's operating model is the regulated transfer-agency function applied to a programmable share register. When a qualified purchaser subscribes to BUIDL, the cash leg clears off-chain into the fund administrator's account at BNY, the fund administrator confirms the subscription, and Securitize mints BUIDL tokens to the subscriber's whitelisted address. Redemption runs the reverse path. A separate Circle smart contract sits adjacent to the BUIDL share class and atomically swaps BUIDL for USDC during market hours, which gives BUIDL holders an on-chain liquidity primitive that does not require waiting for the off-chain fund-redemption cycle. That Circle integration is one of the cleaner production examples of how a tokenised MMF (money-market fund) can carry its own cash-equivalent secondary venue.
BUIDL is multichain by design. Live on Ethereum, Solana, Aptos, Arbitrum, Avalanche, BNB Chain (added 14 November 2025 via Wormhole, with Binance accepting BUIDL as institutional collateral, CoinDesk), Optimism, and Polygon, with Wormhole providing cross-chain transfers between share classes (source). Securitize handles whitelist consistency across nine chain identities, which is a non-trivial engineering job: a holder on Ethereum and a holder on Solana need to be the same legal counterparty under the SEC's transfer-agent recordkeeping rules even though the underlying chain identities are different.
Beyond BUIDL, Securitize services tokenised share classes for several other institutional funds, including private-credit and alternative wrappers, and has been the partner of choice for asset managers issuing tokenised feeders into existing strategies. The participant set on the BUIDL side runs through BlackRock as issuer, Securitize as platform and transfer agent, BNY as administrator and custodian of the underlying T-bill, repo, and cash sleeve, Circle for the USDC swap, and an institutional buyer set including Ondo, Ethena Labs, OKX, and Standard Chartered (source).
Why it matters
Three things. First, BUIDL itself: the fund crossed USD 1 billion in March 2025 (the first tokenised Treasury fund to do so) and passed USD 2 billion plus USD 100 million in cumulative dividends by December 2025 (CoinDesk). Securitize is the operating partner on the largest single tokenised MMF in the world. Second, the SEC-registered transfer-agent stack is structurally rare: most US tokenisation platforms are technology vendors without the registrations, which means the asset manager has to bring its own transfer agent. Securitize collapses that into one counterparty. Third, the broker-dealer plus ATS combination gives Securitize Markets a path to running primary issuance and a regulated secondary venue inside the same group, which is the pattern that an institutional tokenised-securities market structurally needs but few US platforms currently have. Ondo Finance's October 2025 Oasis Pro acquisition is a competitor reaching for the same combination.
The competitive map is partly Ondo (with the Oasis Pro stack), partly Tokeny in Europe, and partly the in-house transfer-agency teams at large fund administrators. Securitize's edge is the BUIDL anchor mandate: the fund is the worked example that any new entrant has to compare against, and the surrounding plumbing (Circle USDC swap, whitelist consistency across eight chains, BNY administration, cross-issuer integration into TCN at Kinexys) sets the operational bar.
Recent moves
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- NYSE selected Securitize as the tokenised-securities platform partner for an exchange-led tokenisation initiative, positioning Securitize-as-transfer-agent inside the central US listings venue rather than only adjacent to it.
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- Aggregate platform AUM across Securitize-issued tokenised products reported at approximately USD 3.3B, with BUIDL the dominant single mandate.
- December 2025. BUIDL passed USD 2 billion AUM and USD 100 million in cumulative dividends (CoinDesk).
- 14 Nov 2025. BUIDL extended to BNB Chain via Wormhole, with Binance accepting the product as institutional collateral. Takes the BUIDL chain footprint to nine and brings the fund into the largest non-US trading venue (CoinDesk).
- April 2025. BUIDL named as launch collateral on Aave Horizon alongside JAAA and JTRSY; Horizon scaled to USD 100m TVL inside the first week (Aave Horizon launch). See Centrifuge V3 + Aave Horizon theme.
- March 2025. BUIDL passed USD 1 billion AUM, becoming the first tokenised Treasury fund through the threshold institutional allocators were watching (The Block).
- March 2025. BUIDL extended to Solana via Securitize, taking the fund to seven chains with Wormhole bridging (CoinDesk).
- Securitize confirmed plans to go public via SPAC, with a transaction structure that places the company on US listed markets while retaining the BlackRock investor relationship.
- Securitize is the issuance and transfer-agency partner across an expanding set of asset-manager mandates beyond BUIDL; the consolidated mandate list is not in current public disclosure.
Vault Registrar EIP and the standards question
A separate strategic thread is Securitize's Vault Registrar work, positioned as a candidate Ethereum standard for putting transfer-agent compliance logic on chain in a way DeFi protocols can read at integration time. If the EIP lands and is adopted by other tokenisation platforms, the structural effect is that institutional tokenised securities become self-describing for KYC and transfer-restriction purposes, removing the off-chain coordination requirement that currently constrains composable distribution into DeFi. The framing matters for the institutional composability paradox: a Vault-Registrar-style standard is one of the resolution paths.
Open questions
- The composition of the institutional buyer base on BUIDL beyond the named participants. Public coverage names a small set; the broader holder distribution is whitelist-confidential.
- Whether Securitize Markets becomes a meaningful secondary venue for tokenised securities beyond primary issuance, or whether secondary flow concentrates on the public-chain DEX surface for tokens that are not gated.
- Cross-chain whitelist administration as the chain count grows. Eight chains on BUIDL is already a non-trivial reconciliation surface.
- How Securitize positions against Ondo's post-Oasis-Pro integrated stack, which is reaching for the same broker-dealer plus ATS plus transfer-agent combination.