August 11, 2026

The last post in this series was about the layer sitting between a bank account and a wallet: the on-ramp. This one goes the other direction, past the issuer, into who actually stands behind Circle, the company behind USDC. The answer keeps coming back to the same name, in three roles that are easy to conflate but worth separating.

Reserve manager

Since November 2022, most of USDC’s reserves have sat in the Circle Reserve Fund, a government money market fund registered with the SEC under Rule 2a-7 and managed by BlackRock Advisors. It holds cash and short-duration US Treasuries, roughly an 80/20 split toward Treasuries, and it isn’t a generic BlackRock product available to other clients: it exists for Circle. The fund is custodied at Bank of New York Mellon, the same custodian Circle already used for the Treasuries backing USDC before the fund existed. This is the least surprising of the three roles: someone has to manage a large pile of short-term government debt, and BlackRock is the largest asset manager in the world. As of Circle’s Q2 2026 results, this fund holds around 90% of USDC’s reserves.

Shareholder

BlackRock’s relationship with Circle isn’t only operational. It invested in Circle’s $400 million Series F round in April 2022, the same year the Reserve Fund launched. When Circle went public on the NYSE in June 2025, raising $624 million by offering 24 million shares, BlackRock was reported to be buying around 10% of that offering. Worth being precise here: that’s 10% of the shares sold in the IPO, not 10% of the company overall, but it still made BlackRock one of Circle’s largest disclosed shareholders at listing.

Backer of what comes next

Circle isn’t only a stablecoin issuer anymore. It’s building Arc, a public blockchain aimed at programmable finance and tokenized assets, with a mainnet planned for September 2026. The presale raised $222 million at a $3 billion valuation, with BlackRock again among the investors, alongside Apollo and Andreessen Horowitz.

What to make of this

None of this is hidden. Circle discloses the Reserve Fund relationship, the SEC filings around the IPO were public, and the Arc presale was covered in the press the way any funding round is. The point isn’t that something improper is happening. It’s that a token marketed as neutral, permissionless infrastructure has, sitting immediately behind it, a fairly concentrated set of relationships with one institution: the manager of the collateral, an owner of the company issuing it, and a funder of its next platform. That’s a very different picture from the “smart contract with no owner” framing stablecoins sometimes get, and it’s worth keeping in mind next to the GENIUS Act’s licensing requirements from a few posts back: the law decides who is allowed to issue, but it says nothing about how concentrated the ownership and custody around that issuer ends up being.