F&O Ban

An F&O ban, formally known as a Futures and Options trading ban or Period of Prohibition, is a regulatory restriction imposed by NSE and BSE on new derivative positions in specific stocks — preventing traders from taking any fresh long or short positions in that stock's futures or options contracts. The F&O ban is triggered automatically when the total open interest (aggregate outstanding positions) in a stock's derivatives contracts exceeds 95% of the Market Wide Position Limit (MWPL) — the maximum permitted aggregate open interest set by the exchange as a percentage of the stock's free float market capitalisation. During an F&O ban, only position reduction (squaring off existing positions) is permitted — no new positions can be created until the open interest drops below 80% of the MWPL, at which point the ban is lifted. Stocks under F&O ban are published daily by NSE and BSE. For Indian derivatives traders, F&O ban situations create important trading implications — the inability to take new positions limits hedging flexibility for institutional investors holding the underlying stock, and the forced reduction of existing positions can cause unusual price volatility in both the derivatives and underlying equity market as participants scramble to reduce exposure. Stocks frequently entering the F&O ban list typically have relatively small free float combined with concentrated speculative interest.