Understanding Pre-Open, Regular and Closing Sessions
A simple explanation of Indian equity market timings and what they mean for strategy design and execution.
22 December 2025 · 4 min read
How the Indian equity session is structured
The Indian equity market is split into distinct phases: a pre‑open session, the regular trading session, the closing session, and specialised block deal windows.
Each phase has different rules for order matching and liquidity, which directly affects how and when your strategies should place orders.
Pre-open vs regular session behavior
The pre‑open session is designed to discover an equilibrium opening price. Order entry and modification are allowed for a short window, after which the system matches orders in a batch.
The regular session that follows is continuous trading, where orders are matched in real time. Many strategies avoid placing sensitive orders during the early minutes while spreads are still settling.
Designing strategies around timings
If your logic depends on opening gaps, overnight risk, or end‑of‑day positioning, you should be explicit about which session boundaries you care about.
Platforms like Algocrab help you schedule and constrain strategies so that they trigger only in the time windows that align with your assumptions.
