A stock halts at 300 on a takeover rumour with a bid of 360 in the air. You are short 500 lots of one-month 320 calls. How do you quote at the reopen, and what do you stand to lose or make?

Quote the call as a deal bet, around Rs 24, not as a volatility product, and know that a confirmed deal costs you about Rs 17 lakh. If confirmed, the stock sits near 358 and the 320 call is worth about 39.7, a loss of 34.7 a share on 50,000 shares. If denied, the stock drops to 270, the call is worth about 0.6 and you keep about Rs 2.2 lakh. At 60% odds the call is worth about 24.1; the old model at a 323 average spot would say 13.4 and be badly wrong.

A raffle ticket is not priced by how the weather varies; it is priced by the odds of the prize. Once a cash bid is in play, Pimpalner's share price has two destinations, near 358 if the deal is confirmed and near 270 if it is denied, and almost no probability in between. The 320 call becomes a digitalAn option whose payoff is all or nothing: a fixed amount if an event happens and zero if it does not. on the deal: worth about 40 in one world and about zero in the other. Its fair value is the probability of the deal times 40, plus a sliver for the denied case, which at 60% is about 24.1. A lognormal model fed the average spot of 323 and the old 30% volatility gives 13.4, because it spreads probability smoothly across prices the stock will never visit.

Three things decide the quote: your estimate of the odds, your position, and how little you know. Centre the market on the deal-weighted value, about 24, skew it higher because you are short 50,000 shares of the call and want to buy some back, and make it wide, perhaps 4 to 5 rupees, because anyone lifting your offer may know more about the deal than you do. The hedge changes character too: the delta of a deal-bet call is close to the deal probability, not the 0.3 you had, and the stock you hold against it will gap with the news rather than drift. A market maker who keeps quoting the pre-halt 30% volatility is handing informed traders free money.

The asymmetry is the lesson. You collected Rs 5 to take a risk you priced at 30% volatility; the bid turned it into a 35 rupee loss with 60% probability against a 4.4 rupee gain with 40%. The delta hedge you hold, roughly 15,000 shares if your delta was 0.3, softens the confirmed case by about Rs 9 lakh as the stock jumps from 300 to 358, and hurts by about Rs 4.5 lakh if it falls to 270, but it does not rescue the trade. Takeover risk is the reason short call premium in a rumoured name looks generous.

A plan, not a lament. First, the quote is a probability, and you will update it with every print and every headline. Second, buy back a tranche of calls at the reopen even at a price that looks dear, because the position is now a single bet far larger than the premium it earned. Third, note the limit: if the deal has conditions, regulatory approval or a shareholder vote, the stock will not sit at 358 but somewhere lower, and the odds will move for weeks. A market maker's job after a halt is to stop pricing yesterday's distribution.