SEBI Master Circular updates trading, margin trading, market making, call auction and OFS frameworks for stock exchanges. SEBI issues a consolidated Master Circular effective on issuance, rescinding listed prior circulars while preserving prior acts and applications, and consolidating operative rules for exchanges and clearing corporations covering trading (bulk/block deals, circuit breakers, price bands, call auctions, IPO/re listing controls), margin trading (eligibility, margins, collateral, leverage, disclosures), market making and liquidity schemes, settlement and risk management, trade annulment procedures, and the framework for Depository Receipts and related compliance and reporting obligations.