MTM lock-and-trail straddle
Many intraday option sellers manage their book the way their broker terminal shows it: as a single rupee profit and loss figure. This short straddle does exactly that. It sells the NIFTY ATM call and put at 11:45 and exits on a rupee target, a rupee stop, or a lock-and-trail rule that protects part of any gain once the position is ₹500 per lot in profit.How it trades
Results
PRE-BUILT · DEFAULTSWhere it made and lost money
The tiny ₹250 stop means the trade survives only on calm afternoons. Quiet sessions with a range under 0.75% made ₹23,063 over 108 trades and won 51%, because the straddle decayed steadily toward the lock or target. Trend days lost ₹3,658 over 70 trades with a 21% win rate, and choppy days lost ₹2,845 over 66, as a move of a few points against the straddle was enough to reach the stop. After a VIX close below 11.5 the strategy made ₹8,856 over 66 trades; after VIX above 14.5 it lost ₹1,397, as bigger swings hit the stop more often.
About this strategy
- At 11:45, sell one lot each of the ATM call and put of the nearest NIFTY weekly expiry.
- Exit both legs if the combined mark-to-market profit reaches ₹1,000 per lot (target).
- Exit both legs if the combined loss reaches ₹250 per lot (stop).
- Once profit has reached ₹500 per lot, lock ₹150 per lot: exit if profit falls back to that level.
- For every further ₹200 of best profit, raise the locked amount by ₹100.
- Close anything still open at 15:15; there is no re-entry.
Why traders use it
Rupee levels are easy to think about and match how many traders set daily limits. Entering late in the morning skips the volatile open and catches the afternoon decay. The lock-and-trail ladder answers a common frustration: watching a profitable straddle turn into a loss. Once a gain has built up, part of it is protected and the protected amount rises as the gain grows. Many broker platforms offer a similar MTM-based exit, which makes the idea familiar.
The year in plain words
On NIFTY from 1 Oct 2025 to 30 Sep 2026 the straddle was sold on 246 days. With a 4-to-1 target-to-stop ratio, most trades ended on the stop: 153 lost exactly ₹250, while 44 reached the ₹1,000 target and 44 exited on the lock. Net P&L was ₹16,060 before costs, from a 37% win rate and a ₹4,190 drawdown, and 9 of 12 months were positive. After ₹20 per order and slippage, it turned into an ₹8,677 loss: the stop is so tight that costs take a large share of every trade.
What the settings do
Risks
- The ₹250 stop is within normal noise, so most trades are stopped and long losing runs (11 in a row here) are normal.
- Costs are large compared with a ₹250 loss or ₹1,000 gain, which turned a profit into a loss here.
- A sharp gap in option prices can fill the stop well beyond ₹250.
- Rupee levels do not adjust to volatility, so the same stop is tighter on volatile days.
Who it suits
Traders who like to manage a position by rupee P&L, can automate the exits, have margin for a short straddle and very low trading costs. Without low costs, the thin edge does not survive.
Questions traders ask
What is an MTM-based stop loss?
It exits the whole position when its combined mark-to-market loss reaches a fixed rupee amount, rather than when an individual option's price hits a level. Here the stop is ₹250 per lot across both legs of the straddle.
How does lock and trail work?
Once the position's profit reaches ₹500 per lot, ₹150 per lot is locked: if profit falls back to ₹150 the trade closes. For every further ₹200 of best profit, the lock rises by ₹100, so more of the gain is protected as it grows.
Is the MTM lock-and-trail straddle profitable?
In this NIFTY backtest from 1 Oct 2025 to 30 Sep 2026 it made ₹16,060 before costs but lost ₹8,677 after ₹20 per order and bid-ask slippage. Statutory charges are not included. Past results do not guarantee future ones.
Why enter at 11:45 instead of the morning?
By late morning the opening volatility has usually settled, so the straddle is sold into the calmer part of the day. The trade-off is less premium and fewer hours of time decay to collect.