Global Custody vs Sub-Custody: Key Differences

A global custodian is a major financial institution that holds assets on behalf of institutional investors and provides settlement, reconciliation, and reporting services across markets worldwide. To service those global investors, a global custodian must hold assets in foreign countries where it does not have local branches or licensing. It solves this by appointing sub-custodians—licensed local institutions in each country that physically hold the assets and interface with local exchanges, central banks, and tax authorities. The liability and reporting flow between the global custodian and its network of sub-custodians, creating a chain of custody that must be carefully documented and monitored.

The reason for two layers

A large institutional investor—such as a pension fund, university endowment, or insurance company—might hold stocks, bonds, or other securities in 50 countries around the world. The investor cannot possibly hold and settle these securities directly in every country; it would require a licensed presence, local banking relationships, and regulatory compliance in each jurisdiction. Instead, the investor opens an account with a single global custodian (such as JPMorgan Chase, Bank of New York Mellon, or Citibank) and says: “Please hold all my assets globally and keep them safe.”

The global custodian accepts this responsibility but does not hold the assets in-house in every country. Instead, it appoints a sub-custodian—a local bank or financial institution licensed and operating in that country—to physically hold the securities there. The global custodian remains the investor’s single point of contact and bears ultimate responsibility to the investor. The sub-custodian is responsible to the global custodian and follows its instructions.

The chain of custody and liability

Legally and contractually, the investor has a relationship with the global custodian only. The investor’s contract specifies the terms of custody, fee structure, reporting frequency, and liability for loss or damage. The global custodian, in turn, signs agreements with each sub-custodian, specifying where assets must be held, what reports the sub-custodian must provide, and the sub-custodian’s liability standards.

If an asset is lost, damaged, or stolen while held by a sub-custodian in, say, Japan, the investor first looks to the global custodian for recovery or compensation. The global custodian then looks to the Japanese sub-custodian for recovery. The investor is insulated from the complexity; the global custodian absorbs the risk of sub-custodian failure and passes it on contractually.

This structure means that a global custodian’s reputation and credit quality matter enormously. If the global custodian itself fails or becomes insolvent, the investor may be exposed to recovery risk even if the underlying securities are safe in the sub-custodian’s vaults. Most investors therefore select global custodians that are large, well-capitalized, and regulated by major financial authorities (such as the Federal Reserve or European Central Bank).

How sub-custodians are chosen and managed

A global custodian typically selects sub-custodians based on several criteria:

• Regulatory standing: The sub-custodian must be licensed to operate as a custodian in its jurisdiction.
• Local relationships: It must have access to local exchanges, settlement systems, and tax authorities.
• Reputation and capitalization: It must be stable and capable of holding large amounts of assets.
• Operational capability: It must have systems to report holdings, process trades, and collect dividends and interest.
• Cost: The global custodian negotiates fees that allow it to offer competitive pricing to end clients.

The global custodian typically maintains a relationship manager or operations team that oversees each sub-custodian. Regular audits and reconciliations ensure that assets are being held correctly and that reports are accurate.

Reporting and reconciliation flows

The investor receives regular statements from the global custodian showing all holdings worldwide, broken down by country or asset type. The global custodian aggregates data from all of its sub-custodians to produce these consolidated reports. If the investor notices a discrepancy (e.g., a dividend not received or a holding that does not match expected position), the investor contacts the global custodian, which then investigates by contacting the relevant sub-custodian.

Data flows from sub-custodian → global custodian → investor, but instructions flow from investor → global custodian → sub-custodian. If an investor wants to sell a stock held in Brazil, the instruction goes from the investor to the global custodian, which instructs the Brazilian sub-custodian to execute the sale on the local exchange and remit proceeds.

Fees and the multi-layered structure

The global custodian charges the investor an overall custody fee, often expressed as a basis points of assets under custody (e.g., 3 basis points = 0.03% per year on a $100 million account). The global custodian then pays sub-custodian fees out of its revenue. Sub-custodian fees vary by country: custody in a major market (USA, UK) is cheaper and more competitive than custody in a less-developed market where the sub-custodian faces higher costs or regulatory burden. This is reflected in pricing tiers for the investor’s global custody agreement.

Where the two layers interact: tax and regulatory issues

One of the most complex areas where global custodian and sub-custodian must coordinate is withholding taxes. When a non-resident investor receives a dividend from a stock held in a foreign country, the local government may require the local agent to withhold a portion of the dividend as tax. The sub-custodian collects this dividend and remits the after-tax amount to the global custodian. The global custodian then reports the dividend and withholding to the investor, and the investor may file for a refund using tax treaties between its home country and the country of the dividend.

Similarly, regulatory changes in a foreign country may affect how the sub-custodian must hold or report assets. The global custodian must stay informed of these changes and communicate requirements to sub-custodians. If a country suddenly restricts foreign ownership of certain securities, the global custodian and sub-custodian must work together to find a solution (e.g., selling the restricted holdings or moving them to a permitted structure).

Stress and failure scenarios

A global custodian with many sub-custodians faces concentration and counterparty risk. If a major sub-custodian (say, in India or a smaller European country) encounters financial difficulty, the global custodian must manage recovery of client assets and potentially appoint a backup sub-custodian. In rare cases (such as the 2008 financial crisis), a sub-custodian failure has temporarily disrupted investor access to holdings, though major global custodians generally maintain insurance and redundancy to mitigate this risk.

For this reason, larger global custodians often maintain relationships with multiple sub-custodians in major markets, so they can switch custody if one becomes unstable.

See also