What Is Prime Brokerage?
Prime brokerage is the suite of services that large investment banks offer to hedge funds and other sophisticated institutional clients. A prime broker holds the fund's assets in custody, lends it money against those assets, sources shares for it to sell short, clears and settles its trades, and consolidates reporting across everything the fund does. Goldman Sachs, Morgan Stanley, and JPMorgan run the largest prime brokerage franchises.
The relationship exists because hedge funds trade with many counterparties but need one operational hub. Rather than posting collateral and settling trades separately with every dealer, the fund centralizes financing and custody at one or a few primes, which frees the fund to focus on investing while the bank handles the plumbing.
How Prime Brokerage Works
The economic core of the business is secured lending. The prime broker extends margin loans against the fund's portfolio and earns a financing spread over its own funding cost. For short sellers, the prime locates and borrows shares through its securities lending desk, charging a borrow fee that can range from a few basis points annually for easy-to-borrow stocks to double-digit percentages for hard-to-borrow names. The prime also rehypothecates client collateral, reusing it to fund its own activities within regulatory limits.
Beyond financing, primes offer capital introduction, connecting emerging managers with potential investors, along with risk reporting, consulting on fund launches, and access to the bank's research and trading resources. Larger funds typically use two or more prime brokers to diversify counterparty risk, a lesson reinforced when Lehman Brothers' 2008 collapse froze assets of funds that had custodied everything there.
Why Prime Brokerage Matters
Prime brokerage is a major revenue engine for the banks, generating well over $20 billion a year across the industry, and it anchors the broader relationship between banks and the hedge fund community. A fund's prime often becomes its main trading counterparty across asset classes, so winning prime mandates drives flow to the rest of the trading floor.
The business also concentrates risk. The 2021 collapse of Archegos Capital Management, a family office that built massive leveraged equity exposure through several primes at once, cost banks more than $10 billion in aggregate, with Credit Suisse alone losing about $5.5 billion. For candidates targeting markets roles, understanding how prime financing, leverage, and counterparty risk interact is increasingly interview-relevant.
