Roughly $2.8bn against a pool estimated at $15bn to $16bn works out at 17.5% to 18.7% [1], and a 40% to 46% share at that same $2.8bn would imply a market of only $6.1bn to $7.0bn [2], which is the same fund holding about two fifths of the share it once held [3]. That gap shows the rank measures order among competitors, while the dollar figure measures the fund itself.
The dividend line is the better tell, or rather the more useful version of it. Cumulative distributions have crossed $100m [12]; at the midpoint of the stated 3.4% to 4.5% band [8], call it 4%, across the roughly 2.25 years from the March 20, 2024 launch [2] to mid-2026 [4], that implies an average balance of about $1.1bn [4]. Most of the money is recent, and recent money is the kind that moves.
Which is why the March 2026 handover to Circle's USYC and the reversal by mid-year [3][4] read here as holder concentration rather than product preference: in a pool this size, a few hundred million dollars of one mandate reorders the table. There's a friendlier reading, too, and it's less flattering to BlackRock: cheap switching is exactly what a treasury team should want when competing products hold the same short bills, cash and repo against a $1.00 target NAV [7], run on the same chains (BUIDL is on Ethereum, Solana, Aptos and BNB Chain [15]), and compete on operations rather than on a yield neither issuer controls, since the quoted 3.4% to 4.5% range is 110 basis points of policy rate [5].
The collateral leg is where concentration actually bites. Deribit and Crypto.com accept the token as margin for trading positions [10], which is the feature that distinguishes this from a money market fund with extra steps, and which also means a holder's redemption request in a stressed week sits behind somebody else's margin call. Securitize, which handles the KYC and AML onboarding and the underlying rails [11] and listed on the NYSE in 2026 [13], is paid for plumbing rather than for the mandate on this reading, so the pool's growth rate matters more to it than which issuer is nominally first. Franklin Templeton got on-chain before BUIDL existed and Ondo has built its position among crypto-native holders [14], which is what a contested market looks like from the outside.
What would prove the thesis wrong: evidence that the post-March inflows came from many newly onboarded accounts rather than a handful [11], or a share that holds above 30% while the pool grows past $16bn [5]. On today's arithmetic the crown is worth about 18 cents of every dollar in the market [1].
