Authorized Participant
An authorized participant (AP) is a large financial institution — typically a major bank or market maker — that has a contractual agreement with an ETF issuer to create or redeem large blocks of ETF shares directly with the fund.
The creation and redemption mechanism is what makes ETFs fundamentally different from closed-end funds and what keeps ETF market prices tightly aligned with the underlying net asset value. Authorized participants are the institutional actors at the heart of this mechanism. Only APs can transact directly with the ETF sponsor; regular investors always buy and sell ETF shares on the secondary market through a brokerage.
When demand for an ETF rises and the market price climbs above NAV, an AP steps in to arbitrage the gap. It assembles a basket of the ETF's underlying securities in the precise weightings specified by the fund, delivers that basket to the ETF issuer (such as BlackRock or Vanguard), and receives a creation unit — a large block of new ETF shares, typically 50,000 shares — in return. The AP then sells those new shares into the secondary market, increasing supply and pushing the price back toward NAV. This process is called creation.
The reverse process — redemption — occurs when the ETF trades at a discount to NAV. The AP buys ETF shares cheaply on the market, aggregates them into a creation unit, and returns them to the ETF issuer in exchange for the underlying basket of securities. This reduces the outstanding share count, decreasing supply and pushing prices back up toward NAV.
This continuous arbitrage activity by authorized participants — major institutions including Goldman Sachs, Citadel Securities, Jane Street, and Virtu Financial — is why highly liquid ETFs like SPY and IVV almost never trade at meaningful premiums or discounts. The mechanism also delivers a tax benefit: when the ETF delivers its lowest-cost-basis shares to APs during redemption, those gains leave the fund without triggering taxable events for remaining shareholders.
Understanding authorized participants helps investors appreciate why ETF liquidity is robust even in stressed markets, and why niche or less-traded ETFs can occasionally show wider bid-ask spreads and larger NAV deviations.