Fund Custodian

A fund custodian is the bank or other regulated institution that holds an investment fund's securities and cash in safekeeping. It settles the fund's purchases and sales, collects dividends and interest, processes corporate actions and keeps records of what the fund owns. The custodian is independent of the investment adviser that decides what to buy, so the people who manage the money are not the people who physically control it.

Custody is one of the main protections built into regulated funds. In the United States, Section 17(f) of the Investment Company Act of 1940 and the SEC rules under it say where a registered mutual fund or ETF may keep its assets. In the EU, UCITS and alternative investment funds must appoint a depositary with even wider duties. The same idea, keeping client assets apart from the firm, runs through custody of funds rules in payments and crypto custody.

A custodian is like a bank's safe-deposit vault that also keeps the books. The fund manager decides what goes into the vault and what comes out, but only the vault keeper holds the keys and records every movement. If the manager went bust or tried to run off with the contents, the assets would still be in the vault, labelled as belonging to the fund's investors.

Splitting the roles makes fraud harder. A dishonest manager would need the custodian's cooperation to move assets, and the custodian's records give the auditor an independent check on what the fund really holds.

Custodians offer a bundle of services, usually priced in basis points of assets plus transaction charges:

• Safekeeping. Holding securities, now almost always in electronic book-entry form at central securities depositories, in accounts identified as the fund's.
• Settlement. Delivering securities and cash when trades settle, which in the US moved to one business day (T+1) on 28 May 2024; see capital market settlements.
• Asset servicing. Collecting dividends and interest, handling corporate actions such as splits and mergers, and reclaiming withholding tax.
• Cash and foreign exchange. Running the fund's cash accounts and converting currencies for foreign trades.
• Related services. Many custodians also act as fund administrator, calculating the daily net asset value (NAV), and run securities lending programmes.

For assets abroad, a global custodian uses a network of local sub-custodians. A small group of very large banks, including BNY, State Street, JPMorgan and Citi, holds a large share of the world's fund assets.

Section 17(f) of the 1940 Act and Rules 17f-1 to 17f-7 permit a registered fund to hold its assets in a limited number of ways:

• With a qualified bank. The most common arrangement; the bank must meet the Act's definition and capital requirements.
• With a member of a national securities exchange (Rule 17f-1), under a written contract and with regular verification.
• Self-custody (Rule 17f-2), with securities in a bank vault, strict access controls and surprise checks by an independent accountant.
• In a securities depository (Rule 17f-4), such as the Depository Trust Company.
• With eligible foreign custodians and foreign depositories (Rules 17f-5 and 17f-7), after the board or a delegated "foreign custody manager" assesses the risks.
• With futures commission merchants for margin on futures and swaps (Rule 17f-6).

The fund's board of trustees approves the custody contract, and the custodian is named in the Statement of Additional Information (SAI). Separately, Rule 206(4)-2 under the Investment Advisers Act requires advisers with custody of client assets to use a "qualified custodian"; it was tightened in December 2009 after the Madoff fraud, a Ponzi scheme in which the manager effectively controlled custody. A 2023 SEC proposal to widen that rule was withdrawn in June 2025.

EU law goes further than the US. Under UCITS V (Directive 2014/91/EU, applying from March 2016) and the AIFM Directive, a fund's depositary must keep financial instruments in custody, monitor all the fund's cash flows and check that the manager follows the fund rules on valuation, dealing and investment limits. If instruments held in custody are lost, the depositary must return identical assets or their value without undue delay, a near-strict liability. UK authorised funds use a similar depositary or trustee, under rules from the Financial Conduct Authority (FCA).

Crypto assets are controlled by private keys rather than entries at a depository, so custody means protecting those keys. The US spot bitcoin exchange-traded products approved in January 2024 each name a crypto custodian for their holdings and a separate cash custodian. Accounting guidance that discouraged banks from holding crypto for clients, SEC Staff Accounting Bulletin 121, was rescinded in January 2025. Some tokenized money market funds combine a traditional custodian for the underlying Treasury securities with blockchain records of fund shares.

Custody protects against misappropriation and the insolvency of the manager, but not against investment losses. Assets held in omnibus accounts through chains of sub-custodians can be harder to trace in a failure, and the concentration of custody in a few banks creates operational and systemic risk. Custodians also lend client securities, which earns income but adds counterparty exposure.

• eCFR: 17 CFR 270.17f-5, custody of fund assets outside the United States
• eCFR: 17 CFR 275.206(4)-2, custody of funds or securities of clients by investment advisers