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Summary: From October 1, expiry day games will get harder. SEBI’s new intraday caps and live surveillance for index options aim to curb manipulation and protect retail traders. This explainer breaks down what’s changed, why now and what it means for investors, traders and F&O enthusiasts.
On most expiry days, the last 45 minutes decide the story. Prices can lurch, volumes spike and small traders get caught on the wrong side. From October 1, 2025, that end-game changes. SEBI has added hard intraday caps (monitored via random snapshots) and expiry-day penalties, replacing the earlier regime where only end-of-day limits were enforced. The aim is simple: fewer outsized bets, calmer closes and cleaner settlement prints.
What has changed
SEBI’s circular brings in hard intraday limits and live surveillance for equity index options.
| Item | Earlier | From Oct 1 | Why it matters |
|---|---|---|---|
| Net position cap (futures-equivalent, longs minus shorts, per entity) | Rs 1,500 crore at end of day (EOD) | Rs 5,000 crore intraday | Removes the ‘build big intraday, cut by close’ loophole |
| Gross cap per side (long or short) | Rs 10,000 crore | Rs 10,000 crore | Same number, but live monitoring now |
| Surveillance | Mostly end-of-day | At least four random snapshots daily, with one between 2:45 and 3:30 pm | Forces discipline right when expiry risk peaks |
| Scope | Index derivatives | Index derivatives only | Stock derivatives are not covered by this circular |
| EOD net cap of Rs 1,500 crore is per SEBI’s May 29 circular and becomes fully effective on December 6, 2025, after the glide path. | |||
Penalty timeline: Exchanges start the new intraday regime on October 1, 2025. Expiry-day penalties or additional surveillance deposits kick in from December 6, 2025.
Futures-equivalent (FutEq) converts options into a ‘futures-like’ exposure using delta, so everything is measured on one scale. That is how the caps are checked.
Why now
Two forces pushed this through. First, retail losses in F&O widened sharply in FY25. SEBI’s study showed that individual traders lost approximately Rs 1.06 lakh crore, a 41 per cent increase year-over-year. Better plumbing helps, even if it does not change payoff maths.
Second, the Jane Street case brought expiry manipulation risk into the spotlight. The firm has challenged SEBI’s actions at the Securities Appellate Tribunal, and the hearings are ongoing. Whatever the final order, the message is clear: monitoring will be live, not after the fact.
A quiet but important shift in the calendar
Weekly and monthly expiries are being standardised: NSE → Tuesday; BSE → Thursday for contracts expiring on/after September 1, 2025. This redistributes liquidity across the week and changes how risk clusters around closing prints.
What changes for you
- If you invest through SIPs or index funds: Nothing in your process changes. You still buy, hold, and rebalance based on goals. The benefit is indirect: cleaner closes, fewer last-minute jolts on expiry, and better market quality for index funds to track.
- If you are an active trader: You will need to pace builds, keep buffers ahead of snapshot windows, and align risk views across accounts. Exchanges will review trades that breach limits, especially near the close on expiry days.
- If you are a retail F&O enthusiast: Treat this as a nudge to size down. Most individual traders lost money in F&O during FY25. SEBI’s new checks may reduce unfair practices, but remember that trading options is still risky. It’s not like putting money in a fixed deposit or savings account. Keep speculation small and purpose-bound.
What to watch next
- Exchange SOPs: MIIs (market infrastructure institutions) have been asked to publish standard operating procedures that operationalise snapshots and breaches. These details will decide how strict the day-to-day implementation feels.
- Jane Street at SAT: The tribunal’s directions and timelines will keep shaping how surveillance evolves in practice.
- Impact on spreads and liquidity: With NSE on Tuesday and BSE on Thursday expiries, watch where market-making shifts and how spreads behave around the close.
Bottom line
This is good market housekeeping. Trading does not change in spirit, but size-driven expiry games get harder and real-time discipline gets tighter. For long-term investors, that should mean fairer closes without hurting liquidity. For traders, the edge must come from strategy, not scale.
For our long-term readers, this is simply news, not a call to action. Your plan remains the same: keep running SIPs, stick to your asset allocation and rebalance on schedule.
Also read: SEBI rewrites the F&O playbook
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