Custody vs Omnibus Accounts: How European Brokers Hold Your Shares

The Two Ways Brokers Hold Your Shares

When you buy a share through a European broker, the security does not sit in your personal name on the company's shareholder register in most cases. Instead, the broker holds it on your behalf using one of two legal structures. The difference between them affects everything from what you actually own to how easily you can move your portfolio elsewhere.

Custody accounts, sometimes called segregated accounts, keep your holdings separate from the broker's own assets and from other clients. The broker acts as a custodian, holding shares in a nominee name but maintaining a clear record that specific securities belong to you. If you own ten shares of Apple, those ten shares are identifiable as yours within the custodian's records and the chain of ownership runs clearly from you through the broker to the central securities depository.

Omnibus accounts pool all client holdings together under the broker's nominee. The broker owns one large block of each security and maintains an internal ledger showing how much of that block belongs to each client. If a thousand clients collectively own a million Apple shares, the broker holds one million shares in its nominee and tracks the breakdown in its own database. Your ownership is a contractual claim against the broker, not a separately identifiable stack of shares.

What This Means for Your Legal Ownership

The legal distinction matters most when things go wrong. With a custody account, your shares are client assets held separately from the broker's balance sheet. If the broker enters insolvency, those assets should not form part of the bankruptcy estate because they are not the broker's property. The liquidator must return your shares to you or transfer them to another custodian, though the process can take months and may require you to prove your claim.

Omnibus accounts create a different risk profile. You own a contractual entitlement to a portion of the pooled assets, not the underlying shares themselves. The broker's records determine how much of the pool is yours. If those records are accurate and the broker has not misused client assets, you should be made whole. But the process depends entirely on the quality of the broker's bookkeeping and the legal framework governing client money and asset segregation in the broker's jurisdiction.

European regulations require investment firms to segregate client assets from their own, but the rules vary by country and the type of license the broker holds. A MiFID-licensed broker in the EU must keep client securities separate and may not use them for its own purposes without explicit consent. A broker operating under a different regime or offering contract-for-difference products instead of real shares may not provide the same protection. The account structure determines how easy it is to verify that segregation actually happened.

Fractional Shares Only Work in Omnibus Structures

You cannot hold 0.3 of a share in your own name on a company register. Fractional ownership exists only because omnibus accounts allow brokers to divide their pooled holdings into arbitrary slices. When you buy a fractional share, you own a claim to a percentage of the broker's total position, not a registered security.

This arrangement works smoothly when everyone trusts the broker's ledger, but it introduces counterparty risk. The broker must correctly track thousands or millions of fractional entitlements, match them to the whole shares it actually holds, and ensure the math always balances. If the broker's systems fail or the firm commits fraud, proving you owned 0.3 shares becomes harder than proving you owned three whole shares in a custody account.

Brokers offering fractional shares typically use omnibus structures for all holdings, not just the fractional ones. This keeps operational complexity lower than maintaining two parallel systems. So when you choose a platform that advertises fractional investing, you are also choosing omnibus pooling for your entire portfolio, including any whole shares you buy.

Voting Rights and Corporate Actions

Shareholders vote on company matters and receive dividends or stock splits. How these rights flow to you depends on the account structure. In a custody account, the broker can usually arrange for you to vote your shares because your ownership is clearly recorded. The process often requires you to request a proxy or legal opinion several weeks before a shareholder meeting, and many European brokers charge a fee for the administrative work, but the path exists.

Omnibus account holders face a more complicated situation. The broker's nominee is the legal shareholder, not you. Voting rights belong to the nominee. Some brokers pass those rights through to clients by collecting voting instructions and submitting them in aggregate. Others do not offer voting at all, treating it as an operational burden not worth the cost for retail accounts. You must check the broker's terms to know whether you can vote, and even when the option exists, the broker may only support voting for securities in certain markets or above a certain holding size.

Dividends and stock splits flow through both structures, but the mechanics differ. In a custody account, the corporate action happens to your identifiable shares and the broker credits your account. In an omnibus account, the broker receives the dividend or new shares for the entire pool and then allocates portions to each client based on the internal ledger. The end result is the same if the broker's systems work correctly, but the omnibus path introduces an extra reconciliation step.

Which European Brokers Use Which Model

Interactive Brokers operates custody accounts for most clients. Your securities are held in segregated customer accounts at IBKR's various regulated entities, and the firm publishes detailed disclosure about how client assets are protected. This structure supports full share ownership, makes portfolio transfers straightforward, and aligns with IBKR's positioning as a serious broker for long-term investors. The trade-off is that IBKR does not offer fractional shares for most stocks, though it has introduced some fractional trading through a different mechanism tied to specific order types.

Trading 212 and eToro both use omnibus structures, which is how they deliver fractional shares and instant execution for small orders. Your holdings are part of a pooled account, and your ownership is a line in the broker's database. Both firms are regulated in Europe and must segregate client assets, but the verification path is less transparent than a custody account. eToro also offers CFDs on the same platform, which adds a layer of complexity because CFDs are contracts with the broker rather than ownership of any underlying asset. The app does not always make the distinction clear.

Saxo Bank uses custody accounts for its core brokerage service, holding client securities in segregated accounts within its Danish banking structure. This appeals to clients who want traditional custody and are willing to pay higher account fees and commissions in exchange. Saxo does not offer fractional shares. The custody model also makes it easier to transfer positions to another broker without liquidating, though Saxo charges for outbound transfers like most custodians do.

Most zero-commission brokers default to omnibus accounts because the structure reduces operational costs and enables fractional trading, which attracts retail users. If you see a broker advertising fractions of expensive US stocks, you can assume omnibus pooling. If the broker emphasizes portfolio transfers and direct registration, it probably uses custody accounts and may not support fractional shares.

What Happens When You Transfer or Close Your Account

Transferring a portfolio between brokers is simpler with custody accounts. The sending broker can instruct its custodian to move your specific securities to the receiving broker's custodian, a process called an ACATS transfer in the US or a similar in-specie transfer in Europe. The shares move without selling, so you avoid triggering a taxable event. Custody brokers usually charge a fee for outbound transfers, but the mechanics are straightforward.

Omnibus accounts complicate transfers. Because you do not own identifiable shares, the sending broker cannot simply move them. Instead, the broker may need to liquidate your fractional positions, transfer whole shares if possible, and send cash for the remainder. Some brokers do not support outbound transfers at all from omnibus accounts, forcing you to sell everything and withdraw cash before opening an account elsewhere. This friction locks you into the platform more than a custody account does.

When you close an account, custody structures let you request share certificates or transfer to another custodian. Omnibus accounts typically require liquidation. The broker sells your holdings, converts the proceeds to your base currency, and sends cash. If you hold US stocks and your account is in euros, you will pay the broker's foreign exchange spread on the way out, and you may realize capital gains you would have preferred to defer.

How to Check What Your Broker Actually Does

The broker's client agreement or terms of service will describe the account structure, though not always in plain language. Look for phrases like "nominee account," "pooled client assets," or "omnibus arrangement" to identify pooling. References to "segregated custody" or "individual client accounts" suggest a custody model. If the document says the broker holds assets "on your behalf" or "as custodian," that points to segregation, but you need to confirm whether segregation means individual custody or just separation from the broker's own assets.

Check whether the broker offers fractional shares. If it does, you are in an omnibus structure for at least some holdings. Then ask whether whole shares are held the same way or separately. Some brokers run hybrid models where fractional shares sit in an omnibus pool but whole shares go into custody, though this is rare because maintaining two systems adds cost.

Look at the broker's regulatory disclosures, especially the investor compensation scheme information. European brokers must tell you which compensation fund covers your account and up to what limit. The existence of compensation does not tell you the account structure, but the details about how assets are protected in insolvency often reveal whether holdings are pooled or segregated. If the disclosure says client assets are held with a third-party custodian, that is a strong signal of a custody account. If it says the broker itself holds assets in a nominee, you are probably in an omnibus arrangement.