US$1.86 Billion of BlackRock's Flagship Tokenized Fund Sits off Ethereum — the Chain It's Supposed to Prove

Ethereum is the chain institutional tokenization is supposed to run on. It is the network cited as the mature, credibly-neutral, most battle-tested venue for moving regulated assets on-chain — the safe answer, the one that shows up first in nearly every "where does Wall Street tokenize" conversation. When BlackRock brought the world's largest tokenized Treasury fund on-chain, it launched on Ethereum, and Ethereum is the chain its materials still lead with.

The money says otherwise. BUIDL — BlackRock's tokenized Treasury fund, and the single instrument most often cited as proof that Wall Street has arrived on Ethereum — holds US$1.86 billion, 64% of its US$2.88 billion, on seven other chains. Avalanche holds US$903 million. Solana holds US$631 million. Ethereum — the chain that's meant to be the trustworthy default — holds US$1.02 billion — barely a third of the fund, and less than Avalanche and Solana hold between them.

Why BUIDL is the fund to watch

When BlackRock and Securitize launched BUIDL in March 2024, it was a statement as much as a product: the largest asset manager in the world putting a Treasury fund directly on a public blockchain. It invests entirely in cash, US Treasury bills and repo, targets a stable US$1 token, and pays daily dividends on-chain — tokenized institutional cash, custodied by BNY Mellon. Within a year it passed US$1 billion; by late 2025 it had reached US$2.5 billion, the largest tokenized money-market fund on public blockchains. It has kept growing since — the on-chain total today is US$2.88 billion, up roughly 21% in the past month alone. And that growth is not landing on Ethereum: in the same window Avalanche took on close to US$500 million while Ethereum's balance barely moved. The new institutional money choosing BUIDL is, on net, choosing somewhere other than Ethereum to hold it.

That size is why BUIDL matters beyond itself. It is not just a fund — it has become the on-chain cash layer other institutional products are built on. Ondo's OUSG holds it. Ethena's institutional stablecoin USDtb launched backed by it, alongside USDC. When analysts and reporters want a single number for "how much real institutional money is on-chain," BUIDL is the number they reach for. So where BUIDL's money actually sits is read, fairly or not, as where the whole category is going.

The conventional read is Ethereum. The on-chain record says otherwise.

Where the money actually is

BlackRock and Securitize have never published this table. They announce each chain launch on its own — five chains at once in November 2024 (Aptos, Arbitrum, Avalanche, Optimism, Polygon), Solana in March 2025 — but never the running total across all of them, and never how it shifts. Each press release is a moment; nobody keeps the scoreboard. That is the specific gap on-chain measurement closes: not a bigger number than what's public, but the one cut of it nobody maintains. The figures here cover all eight chains BUIDL is issued on and reconcile to the fund's full on-chain total — this is the complete distribution, not a sample.

Ethereum's US$1.02 billion is itself two active contracts — the current primary share class plus a legacy one that still holds US$191.5 million and is still growing. Count only the primary and you understate Ethereum by nearly US$200 million, which would make this story look more dramatic than it is. Both are counted here. The majority is real without the exaggeration.

Not a one-day snapshot

The easy dismissal would be that this is a single reading — a temporary imbalance that mean-reverts by next week. It isn't. The distribution is structural: BUIDL's largest balance has sat on Avalanche, not Ethereum, for weeks, and the fund's total has been growingover that span while Ethereum's slice stayed close to a third. This is where the money settled and stayed, not a momentary quirk of one afternoon's redemptions.

Two chains carry most of the off-Ethereum weight. Avalanche and Solana together hold US$1.53 billion — more than Ethereum's entire deployment. Below them, BNB Chain holds another US$246 million. The five remaining chains — Optimism, Arbitrum, Aptos, Polygon, and the rest — hold small balances individually, but they are counted: the figure here is the complete on-chain total, not a Ethereum-plus-two approximation.

A caution the raw split hides, and one worth stating plainly because it's the first thing a skeptic will ask: this is not evenly-distributed retail demand. On Solana, OCB's holder data shows the top ten addresses hold essentially the entire US$630 million balance — a highly concentrated position, consistent with a small number of institutional holders rather than a broad market. Avalanche is more distributed but still concentrated. So the honest read is not "the retail market is voting with its feet"; it is that the large institutional holders who move this kind of capital have placed the majority of it off Ethereum — and, on Solana especially, kept it there.

A straw in the wind

One data point the same week is worth noting, with the caveat that it's an anecdote, not proof: Securitize — BUIDL's transfer agent, the infrastructure layer under the fund — completed a SPAC merger and began trading on the NYSE under ticker SECZ on July 2. On the same day, it tokenized its own newly public stock and made it available initially on Avalanche and Solana — not Ethereum.

It would be too much to call one company's choice for its own IPO stock evidence about BUIDL's holder base; the two aren't mechanically linked. But it's a straw in the same wind: the firm that runs the plumbing under the flagship tokenized fund, given a fresh product and a free choice of chain, reached for the two networks where that fund's balances already sit — and not for the chain everyone assumes is the default.

What it means

None of this makes Ethereum's position collapse — it still holds the single largest share, and US$1 billion of the most-watched tokenized fund is not nothing. But the assumption underneath a great deal of institutional-tokenization strategy — that going on-chain means going to Ethereum — is doing less work than it looks. Measured across every chain the fund is issued on, nearly two-thirds of the bellwether fund sits off Ethereum, and the new money arriving this quarter has gone mostly elsewhere; the largest of those off-Ethereum balances is held by a concentrated set of institutional addresses that have kept it there.

The honest caveat is that this is one fund, and its Solana majority is a concentrated position, not a broad market. So the open question is whether it's BUIDL-specific or the leading edge. If it's idiosyncratic — a fee-and-access decision peculiar to one fund and a handful of its counterparties — then Ethereum's default-chain status is intact and this is a footnote. If the next tokenized Treasury fund to report its cross-chain split looks like this one, the market has already answered a question the industry's assumptions are still asking. That's the figure worth watching: not BUIDL's size, but whether the second and third funds settle where BUIDL did.