What happened
BlackRock's BUIDL fund, the tokenized US Treasury product issued through Securitize, saw its assets on Avalanche climb to around $900 million over the past week, according to CryptoBriefing's Sunday report. That's roughly a doubling from the prior week's level, and it's the fastest chain-level growth BUIDL has posted since it expanded beyond Ethereum. BUIDL launched in March 2024 as a tokenized wrapper over short-dated Treasuries and cash-equivalents, with Securitize acting as transfer agent and BNY Mellon as custodian.
The Avalanche deployment was one of the newer legs of a multi-chain rollout that also touches Ethereum, Polygon, Arbitrum, Optimism, and Aptos. Cryptomat has not independently verified the on-chain balance, and BlackRock has not issued a public statement tied to the milestone.
Why it matters
Tokenized Treasuries are the cleanest institutional bridge into public blockchains right now, and BUIDL is the single largest product in that segment. A weekly doubling on one chain isn't a rounding error. It's a signal that a large allocator, or a cluster of them, chose Avalanche rails specifically.
Ethereum still hosts the majority of BUIDL's total float, but the AUM shift matters because it tests the assumption that RWAs are an Ethereum-only story. It also feeds a narrative Avalanche's team has pushed for over a year: that subnets and institutional-grade settlement can pull tokenized cash away from more congested L1s. If BlackRock keeps routing net new inflows to Avalanche, the RWA leaderboard reshuffles.
That has second-order effects on stablecoin routing, DeFi collateral, and treasury management for on-chain funds.