Securities Lending
Securities lending is the temporary transfer of securities by an owner (the lender) to a borrower — typically a broker-dealer or hedge fund — in exchange for collateral and a lending fee, enabling the borrower to use the securities for purposes such as facilitating short sales or satisfying delivery obligations.
When an investor sells a security short, they sell shares they do not own and must therefore borrow those shares from a party that holds them. Securities lending is the formal mechanism through which those shares are sourced. The lender — often an institutional investor such as a mutual fund, pension fund, or ETF — transfers legal ownership of the securities to the borrower for a defined or open-ended term. The borrower simultaneously delivers high-quality collateral, typically cash or U.S. Treasury securities, worth slightly more than the market value of the borrowed shares (commonly 102-105 percent).
In exchange for lending, the lender receives a fee — the securities lending rate or borrow rate. For widely available, easy-to-borrow securities, this rate is low (often just a few basis points annually). For stocks in high demand by short sellers — called hard-to-borrow securities — the borrow rate can be extremely high, sometimes exceeding 100 percent annually, making sustained short positions financially expensive.
In the U.S. retail brokerage context, many broker-dealers operate fully paid lending programs through which retail customers may voluntarily lend out shares held in their accounts in exchange for a portion of the lending fee income. Under Rule 10b-16 of the Securities Exchange Act and related FINRA guidance, brokers must disclose fully paid lending program terms to customers. Customers who participate should understand that while the broker typically indemnifies them against borrower default, the lent shares are no longer held in a typical custodial capacity, and dividend payments received on lent shares may be treated as substitute payments (cash in lieu) rather than qualified dividends, potentially affecting tax treatment.
For short sellers, the cost of borrowing directly affects the economics of a trade. A high borrow rate imposes a daily carrying cost on the position, which accrues against any potential gains from price decline. Understanding borrow availability and rates is a fundamental part of evaluating short-sale opportunities in U.S. equity markets.