Stock Lending and Borrowing (SLB)
Stock Lending and Borrowing (SLB) is a mechanism operated by NSE Clearing Limited (formerly NSCCL) through which investors lend their securities to approved borrowers — typically short sellers — in exchange for a lending fee, with SEBI-mandated margins, standardised tenures, and a central counterparty guarantee ensuring settlement integrity.
The SLB mechanism in India was formally introduced by SEBI in 2008 and has been progressively liberalised. Under the current framework, lenders and borrowers transact on the SLB platform maintained by NSE Clearing Limited. The NSE acts as the central counterparty — guaranteeing both legs of the transaction — which eliminates the bilateral counterparty risk that would otherwise discourage participation. Securities eligible for SLB include those in the Futures and Options (F&O) permitted list, currently comprising about 300–400 stocks.
The mechanics work as follows: the lender deposits securities in the SLB pool and receives a lending fee, which is agreed upfront at the time of the transaction. The borrower deposits cash or approved collateral as margin to cover the obligation to return equivalent securities at the end of the contract tenure. SLB contracts on NSE are standardised with monthly tenures aligned with F&O expiry cycles, running up to twelve months. The borrower is entitled to any corporate actions (dividends, bonuses, splits) that occur during the lending period, but these must be passed through to the lender via the clearing mechanism.
The primary motivation for borrowing securities is short selling: an investor who believes a stock will fall borrows shares, sells them in the market, and later repurchases at a lower price to return to the lender, pocketing the difference less the lending fee. SEBI regulations prohibit naked short selling — short selling of stocks not possessed or not borrowed — for all categories of investors, making SLB the designated channel for covered short selling in the Indian equity market.
From the lender's perspective, SLB generates incremental income on long-term holdings without disturbing the investment thesis. A mutual fund, insurance company, or retail investor with a multi-year holding can lend their securities during periods they do not intend to sell, earning an annualised lending fee that has ranged from 1% to 15% depending on the stock's demand from short sellers and current market conditions. The dividend pass-through mechanism ensures lenders do not lose out on income during the lending period.
A structural challenge for SLB in India has been the dominance of the F&O segment as the primary vehicle for expressing bearish views. Because F&O allows leverage and does not require physical share delivery for most positions, it is cheaper and more convenient for sophisticated short sellers than SLB. This limits SLB participation to situations where F&O is unavailable or where the basis between SLB and F&O pricing creates arbitrage opportunities.