GlossaryTerm · Wealthtech

What is a custodian in investing?

By Tokenova Editorial Desk

The institution that keeps your investments safe, separate from the firm that manages them.

3 sources ↓
A huge round vault door on its hinge in a bank basement
Photo: “Cleveland FRB Vault Door - brightened” by Spamguy at English Wikipedia, CC BY 2.5 (edited: cropped, colour-graded)

Quick answer

A custodian is a financial institution that holds and safeguards investors' securities and cash. In the US, investment advisers with custody of client assets generally must keep them with a qualified custodian, such as a bank or registered broker-dealer, which sends account statements at least quarterly⁠[2].

Key points

  • A custodian holds your securities and cash and keeps records of them, separate from the firm that advises you.
  • US qualified custodians include banks, registered broker-dealers, futures commission merchants and certain foreign institutions.
  • Statements sent directly by the custodian give you an independent check on what an adviser or app tells you.
On this page
  1. What does a custodian do?
  2. Why do the rules require a separate custodian?
  3. Is a crypto custodian the same thing?
  4. FAQ
  5. Sources

#What does a custodian do?

Think of a custodian as the vault and the record-keeper for your investments. It holds the securities and cash, processes buys and sells, collects dividends and sends you statements. The firm that decides what to buy, such as a robo-advisor or a human adviser, is often a different company. The SEC describes qualified custodians as "banks, registered broker-dealers, futures commission merchants, or certain foreign entities"⁠[1].

#Why do the rules require a separate custodian?

Separation makes it harder for client assets to be misused or lost if a firm fails. Under the SEC custody rule, an adviser that has custody must, in general, keep client funds and securities with a qualified custodian, make sure the custodian sends account statements at least quarterly, and undergo a surprise examination by an independent public accountant at least once each calendar year⁠[2]. Brokers that hold customer securities must maintain possession or control of fully paid securities under a separate customer protection rule⁠[3]. The bigger picture is explained in how investor protection works.

Worked example

Example

You invest through an app run by an adviser. Each quarter you get two statements: one in the app, and one emailed by the custodian, a broker-dealer named in your account agreement. The app says you hold 12.5 units of a fund; the custodian's statement says the same. If they ever disagreed, the SEC suggests contacting both the adviser and the custodian about the discrepancy⁠[1].

#Is a crypto custodian the same thing?

The idea is the same, holding assets safely for someone else, but the technology and the legal protections can be very different. Our guide to crypto custody covers how digital assets are held.

Frequently asked questions

How do I find out who my custodian is?

Check your account agreement or statements. The SEC suggests checking whether you receive statements from a qualified custodian at least quarterly and whether the account is in your own name⁠[1].

Does a custodian protect me from losses?

No. A custodian safeguards the assets you own; it does not stop their value from falling.

Sources

  1. Investor Bulletin: Custody of Your Investment Assets — US Securities and Exchange Commission (Investor.gov), 2013 Primary
  2. 17 CFR 275.206(4)-2 — Custody of funds or securities of clients by investment advisers — eCFR (US Code of Federal Regulations), 2026 Primary
  3. 17 CFR 240.15c3-3 — Customer protection: reserves and custody of securities — eCFR (US Code of Federal Regulations), 2026 Primary

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