Trading term

What is Custodian?

A custodian is the institution that actually holds your securities and cash for safekeeping. It's often not the broker whose app you log in to — many brokers outsource custody to a separate, heavily regulated firm.

There are two jobs hiding behind the word broker. One is taking your order and getting it filled. The other is holding the shares afterwards, keeping the register of who owns what, collecting dividends and processing corporate actions. That second job is custody, and the firm that does it is the custodian.

Plenty of brokers do both. Plenty don't. A newer app-based broker very often introduces you to a third-party custodian — a bank or a specialist like BNY, State Street, Apex or Interactive Brokers — and that firm is where your shares really sit. It's the reason a broker can fail without your portfolio disappearing with it: the assets were never on the broker's balance sheet in the first place.

Custodians are regulated separately and are required to keep client assets segregated from their own. That segregation is the whole point. Your shares aren't a loan to the custodian and can't be used to pay its creditors, so an insolvency there becomes an administrative mess rather than a loss of ownership.

For example

You open an account with a commission-free app and buy 40 shares. The app's terms name a clearing and custody firm you've never heard of. That firm holds the 40 shares in a segregated client account, credits the dividends, and reports the position back to the app — which is all you ever see.

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Why it matters to you

Who holds your assets decides what happens when something goes wrong. Money you're owed by a failed broker is a claim in a queue; shares held in segregated custody are still yours. It also explains why compensation schemes cap out low — around $500,000 under SIPC in the US, £85,000 under the FSCS in the UK — while they still describe a portfolio worth far more as safe. The cap covers the shortfall, not the holding.

⚠ The name on the app isn't necessarily the name holding your shares

People assume the brand they log in to is the one with the assets. Check the account terms for the custodian's name and where it's regulated. That's the entity whose failure would actually matter to you, and it's the one worth ten minutes of reading before you fund an account.

Frequently asked questions

What does a custodian do?

It holds securities and cash for safekeeping, keeps the ownership records, collects dividends and interest, and processes corporate actions like splits and mergers. It doesn't decide what you buy or sell.

Is my broker my custodian?

Sometimes. Large full-service brokers usually self-clear and act as their own custodian. Many smaller and app-based brokers outsource custody to a third-party firm, which will be named in the account terms.

What happens to my shares if the custodian fails?

Client assets must be segregated from the custodian's own, so they aren't available to its creditors. The positions get transferred to another firm, which can take weeks and freeze your access in the meantime, but the ownership itself isn't erased.

Read the full guide

Getting startedWhat Is a Broker?A broker sends your order to the market and then holds the shares for you. Here's what that means, whose name your shares are actually in, and how a $0 broker still makes money.12 min read

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