# Prime Brokerage

> Prime brokers give hedge funds financing, stock lending, clearing, custody and reporting. Learn the services, how prime brokers earn money and the risks.

Source: https://learn.tradelabsai.com/industry/prime-brokerage/  
Track: The Trading Industry · Level: Beginner · Updated: 2026-10-03  
Publisher: TradeLabs AI (https://tradelabsai.com). Education, not financial advice.  
Cite as: TradeLabs Learn, "Prime Brokerage", https://learn.tradelabsai.com/industry/prime-brokerage/

Prime brokerage is a bundle of services that large banks and brokers provide to hedge funds and other professional investors. A prime broker lends the fund money, finds shares for it to short, clears and settles its trades executed with many brokers, holds its assets and gives it consolidated reports. For a hedge fund, the prime broker is a central partner that makes leverage and short selling possible. For banks, prime brokerage is a significant and profitable business, though one with real risks, as the Archegos collapse in 2021 showed.

## Core prime brokerage services

| Service | What it provides | Lesson |
|---|---|---|
| Margin financing | Loans to buy securities with leverage | [Margin Financing](https://learn.tradelabsai.com/industry/margin-financing/) |
| Securities lending | Borrowing shares to sell short | [Securities Lending and Stock Loan](https://learn.tradelabsai.com/industry/securities-lending/) |
| Clearing and settlement | Settling trades executed through many brokers | [Clearing, Settlement and Custody](https://learn.tradelabsai.com/industry/clearing-settlement-and-custody/) |
| Custody | Holding the fund's assets | [Clearing, Settlement and Custody](https://learn.tradelabsai.com/industry/clearing-settlement-and-custody/) |
| Consolidated reporting | Positions, P&L and risk across all brokers | [Investor Reporting](https://learn.tradelabsai.com/industry/investor-reporting/) |
| Synthetic financing | Swaps that give exposure without owning the asset | [Swaps Explained](https://learn.tradelabsai.com/bonds-credit/swaps-explained/) |
| Capital introduction | Introducing funds to potential investors | [Hedge Funds](https://learn.tradelabsai.com/industry/hedge-funds/) |

## How prime brokers earn money

| Source | Detail |
|---|---|
| Financing spread | Charging more on margin loans than their own funding cost |
| Stock borrow fees | Fees for lending shares, high for hard to borrow stocks. See [Borrow Fees and Stock Loan Costs](https://learn.tradelabsai.com/orders/borrow-fees-and-stock-loan-costs/) |
| Rehypothecation | Reusing clients' collateral within limits to fund other activities |
| Trading and swap spreads | Earnings on derivatives and execution |

The largest prime brokers have historically included Goldman Sachs, Morgan Stanley and JPMorgan, alongside other global banks.

## Synthetic prime brokerage

Instead of lending money to buy shares, a prime broker can give a fund the same exposure through a total return swap: the bank holds the shares and pays the fund the returns, while the fund pays financing costs. This can offer higher leverage and keeps the fund off public ownership registers, since the bank legally owns the shares. That opacity played a central role in the Archegos case. See [Swaps Explained](https://learn.tradelabsai.com/bonds-credit/swaps-explained/).

**Example: How Archegos hurt its prime brokers**
Archegos Capital Management, a family office, built enormous concentrated positions in a handful of stocks through total return swaps with several prime brokers. Each bank saw only its own exposure, not the total, which some estimates put at over $100 billion of gross exposure on about $10 billion or more of capital. When some of the stocks fell sharply in March 2021, Archegos could not meet margin calls. Banks raced to sell the underlying shares. Those that sold first lost little; Credit Suisse lost about $5.5 billion and Nomura about $2.9 billion. See [Archegos Capital](https://learn.tradelabsai.com/history/archegos-capital/).

## Risks in prime brokerage

| Risk | For whom | Example |
|---|---|---|
| Counterparty risk | Banks | A client defaults on margin, as with Archegos. See [Market, Credit and Counterparty Risk](https://learn.tradelabsai.com/portfolio/counterparty-risk/) |
| Counterparty risk | Funds | A prime broker fails, as with Lehman Brothers in 2008, freezing client assets |
| Liquidity and margin calls | Funds | Prime brokers raise margin requirements in stress, forcing sales. See [Liquidity Risk](https://learn.tradelabsai.com/portfolio/liquidity-risk/) |
| Concentration | Both | Large positions in a few names |

After Lehman, many hedge funds spread their business across several prime brokers to reduce dependence on one.

## Multi prime arrangements

Larger funds commonly use two or more prime brokers, which reduces counterparty risk and improves financing terms, but adds operational complexity. Reconciling positions across primes becomes a key operational task. See [Trade Accounting and Reconciliation](https://learn.tradelabsai.com/industry/trade-reconciliation/).

For a closer look at the firms that provide these services and how funds choose them, see [Prime Brokers](https://learn.tradelabsai.com/market-structure/prime-brokers/).

## Frequently asked questions

### What is a prime broker?

A bank or broker that provides hedge funds with financing, securities lending, clearing, custody and consolidated reporting.

### How do prime brokers make money?

Mainly from interest on margin loans, fees for lending securities, financing spreads on swaps and related trading services.

### Why did Archegos cause such large losses?

It built huge, concentrated, leveraged positions through swaps with several banks that could not see its total exposure, and when prices fell it could not meet margin calls.

Next, learn how to pick a broker for your own trading in [How to Choose a Broker](https://learn.tradelabsai.com/industry/how-to-choose-a-broker/).

## Continue learning

- Next lesson: [How to Choose a Broker](https://learn.tradelabsai.com/industry/how-to-choose-a-broker/)
- Previous lesson: [Futures Commission Merchants (FCM)](https://learn.tradelabsai.com/industry/futures-commission-merchants/)
- Related: [Futures Commission Merchants (FCM)](https://learn.tradelabsai.com/industry/futures-commission-merchants/): A futures commission merchant holds customer funds and clears futures trades. Learn how FCMs differ from introducing brokers and how funds are protected.
- Related: [Prime Brokers](https://learn.tradelabsai.com/market-structure/prime-brokers/): Prime brokers provide hedge funds and professional traders with financing, securities lending, custody and execution. Learn what they do and the risks involved.
- Related: [Hedge Funds](https://learn.tradelabsai.com/industry/hedge-funds/): Hedge funds are private investment pools using flexible strategies, leverage and short selling. Learn the main strategies, fee structures, regulation and risks.
- Related: [Securities Lending and Stock Loan](https://learn.tradelabsai.com/industry/securities-lending/): Securities lending lets short sellers borrow shares from owners for a fee. Learn how stock loans work, collateral, borrow fees, recalls, risks and who benefits.
- Related: [Margin Financing](https://learn.tradelabsai.com/industry/margin-financing/): Margin financing lets traders borrow from brokers against their holdings. Learn how margin loans are priced, collateral haircuts, margin calls and financing risks.
- Related: [Archegos Capital](https://learn.tradelabsai.com/history/archegos-capital/): In March 2021, family office Archegos Capital collapsed, causing banks over $10 billion in losses. Learn how total return swaps hid its leverage and the lessons.