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Authorized Participant

An authorized participant (AP) is a large financial institution — typically a broker-dealer or market maker — that has been authorized by an ETF issuer to participate in the creation and redemption process. APs buy baskets of the underlying stocks or bonds and exchange them for newly issued ETF shares, or exchange existing ETF shares for underlying securities. This role makes APs essential to ETF functioning and pricing efficiency.

This entry covers APs as market participants. For the process they execute, see ETF creation and redemption; for how it impacts pricing, see ETF premium and discount.

What APs do

An authorized participant’s job is to maintain the supply and demand balance for an ETF. Here is a typical scenario:

Creation. When investors flood into an ETF, demand for shares grows. The AP steps in: it buys a basket of the underlying 500 stocks (if it is an S&P 500 ETF) and exchanges them with the fund for newly created ETF shares. The AP then sells those shares on the stock exchange to meet investor demand. The AP is compensated through the creation fee and the bid-ask spread it captures.

Redemption. When investors sell ETF shares, the AP accumulates inventory. Rather than selling the ETF shares, which would depress the price, the AP redeems them: it exchanges ETF shares with the fund for the underlying basket of stocks, then sells the stocks on the market. The AP profits from the bid-ask spread and any arbitrage opportunity.

Continuous arbitrage. Throughout the day, APs watch for prices that diverge from NAV. If the ETF trades at 0.1% above its true value, an AP buys the ETF shares, redeems them for the underlying securities, and sells the securities at a 0.1% profit. If the ETF trades below NAV, the AP does the reverse. This arbitrage keeps prices aligned.

Who are the major APs

The largest ETF issuers typically have relationships with 5–30 authorized participants. For the largest, most liquid ETFs, major investment banks and market makers serve as APs:

  • Goldman Sachs
  • Morgan Stanley
  • Bank of America
  • Citadel Securities
  • Virtu Financial
  • Jane Street
  • Susquehanna International

These firms have the capital, technology, and relationships to efficiently gather baskets of securities and execute arbitrage trades.

Smaller ETFs might have fewer APs or APs who are smaller, regional market makers. This creates a risk: if an ETF has very few APs and they stop actively creating and redeeming, the ETF’s price can drift significantly from NAV.

Benefits of the AP system

The authorized participant system delivers several benefits to everyday ETF investors:

Tight bid-ask spreads. Because APs can instantly create new inventory by creating ETF shares or supply shares to redeem by gathering underlying securities, they do not need to quote wide spreads to manage inventory risk. This benefits retail investors who buy and sell ETFs.

Pricing efficiency. The threat of arbitrage by APs keeps ETF prices within a few basis points of NAV. If an ETF tried to trade at a 1% premium, APs would immediately redeem shares, shorting the stock to pocket the profit, driving the price back down.

Liquidity without dealer inventory. Without APs, an ETF issuer would need to hold large inventories of cash or securities to meet redemptions. Instead, APs handle this, making the fund capital-efficient.

Tax efficiency. The ability to redeem in kind (receiving underlying securities rather than cash) means portfolio managers avoid forced taxable sales.

Conflicts and constraints

The AP system also creates potential issues:

Concentration risk. If an ETF relies on a handful of APs and they become stressed (during market crashes or liquidity crises), they may stop creating and redeeming. The ETF’s price can then diverge sharply from NAV. This happened during the March 2020 COVID crash, when some ETFs traded at discounts of 5% or more.

Custody and counterparty risk. APs must trust the ETF custodian with massive quantities of securities. If the custodian fails or is compromised, APs face losses.

Information advantage. Large APs see order flow before it hits public markets, giving them an informational advantage that they can exploit through trading.

Regulatory scrutiny. The SEC periodically scrutinizes AP compensation and incentives to ensure they are appropriate and transparent.

How many APs does an ETF need

The liquidity and reliability of an ETF correlates with the number and quality of APs:

  • Large, liquid ETFs (like SPY, VOO, QQQ) have 10–30+ APs constantly creating and redeeming. These ETFs are extremely efficient and liquid.
  • Moderate ETFs might have 3–8 APs. These are still liquid but with slightly wider spreads.
  • Tiny ETFs might have only 1–2 APs. These are at risk of premium/discount drift if the AP becomes inactive.

Retail investors can use the number of APs as a proxy for ETF quality. More APs usually mean tighter spreads and more reliable pricing.

See also

Wider context