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What happens to a short put when the stock gets acquired?

If you sold a put and the company gets bought for cash above your strike, the put usually ends worthless and you keep the premium. The danger is the deal falling apart before it closes. Then the stock can drop far below your strike.

Options guide · 8-minute read · Updated 2026-10-28

The short answer

You sold a Put option. Then a buyer offered to pay cash for the whole company. What now?

If the deal price is above your Strike price, the stock jumps toward the deal price. Your put falls close to zero. When the deal closes, the put usually ends early and settles at zero, so you keep the whole premium.

If the deal price is below your strike, the put settles for the gap, and you pay it.

And if the deal breaks before it closes, the stock can fall hard. That is the case that hurts sellers. For every event that can rewrite a contract, see my hub on corporate actions and your options.

What happens to the put when a cash deal closes

Every listed US option is cleared by the OCC, the Options Clearing Corporation. When an all-cash deal closes, each share turns into a set amount of cash. A put on those shares now delivers cash, not stock.

There is nothing left to move, so the OCC usually ends the options early. This is called Accelerated expiration. Each put settles for its Intrinsic value only: the strike minus the deal price, times 100, if that number is above zero.

• Strike below the deal price: the put settles at zero. You keep the premium. No shares, no cash owed.
• Strike above the deal price: the put settles for the difference. You pay it in cash.

The exact terms for a real deal are in the OCC information memo for that event. Your broker can point you to it.

A worked example where the deal closes (hypothetical)

This is an illustration, not a trade idea. XYZ is a made-up stock.

• XYZ trades at $40.
• You sell one put, $35 strike, 60 days out, for $1.00. You collect $100.
• Your broker sets aside $3,500 in case you have to buy the shares.

Two weeks later, a buyer offers $50 a share in cash. XYZ jumps to $48.50 and sits there. Your $35 put is now far below the price. It trades for about $0.05.

You have two choices:

1. Buy it back for $5. You keep $95 and get your $3,500 back to use now.
2. Hold it. If the deal closes before expiry, the put settles at zero. If it is still pending at expiry, the put most likely expires worthless. Either way you keep $100.

Holding earns you $5 more. It also keeps $3,500 tied up against a deal that might still break. For $5, closing is often the cleaner choice.

The trap: selling a new put on a deal stock (hypothetical)

Here is where sellers get hurt. The deal is announced. XYZ sits at $48.50, just under the $50 offer. It looks calm. So you sell a fresh put.

• You sell one put, $45 strike, 60 days out.
• The premium is small, because the market expects little movement. Say $0.40, or $40.
• Your broker sets aside $4,500.

The put pays $40 if the deal goes through. But if the deal breaks, XYZ does not politely drift back to $45. It can gap down to where it traded before the offer, or lower.

Work the bad row through. You buy 100 shares at $45, which costs $4,500. They are worth $3,600. That is a $900 loss on the shares. The $40 premium brings it to −$860.

So the trade risks $860 to make $40. One broken deal wipes out the premium from more than twenty that close. That is the whole story of selling puts on buyout targets.

Why deals break, and why the drop is so fast

A deal can fail for many reasons:

• A regulator blocks it.
• The buyer can't raise the money.
• Shareholders vote no.
• Bad news comes out and the buyer walks away.

When it fails, the people who bought the stock only for the deal all sell at once. The price can fall to the pre-deal level in one morning. If the reason was bad news, it can fall below it.

There is no time to adjust a put before that gap. That's why the strike you pick has to make sense even without the deal.

How to handle a short put on a deal stock

If you already hold a short put when an offer is announced:

1. Find the deal price and compare it with your strike. Strike well below the deal price? Your put is near zero. Closing it for a few cents frees your cash.
2. Read the deal terms. All cash, all stock, or a mix? Stock deals don't pin the price the same way. A mix changes what the contract delivers. See options in a cash-and-stock merger.
3. Ask: would I want these shares if the deal broke tomorrow? If not, close the put while it's cheap.

If you are thinking of selling a new put on an announced target:

1. Price the worst case first. Where did the stock trade before the offer? That's your likely floor if the deal breaks, and it may not hold.
2. Compare the premium with that loss. In the example, $40 against $860.
3. Set the strike at a price you'd pay with no deal at all. If that strike pays almost nothing, there's no trade.

This fits the same rule as the wheel strategy: only sell a put on a stock you'd be glad to own at the strike, sized as if you were buying the shares today.

In Canada, cash-secured puts in a TFSA or RRSP depend on your broker, and options permissions differ by broker. Check yours before you sell one.

What about a stock-for-stock deal?

In an all-stock deal, each share of XYZ turns into shares of the buyer. Your put is adjusted to deliver those shares instead. It doesn't settle early in cash. It keeps trading until its normal expiry.

That means your put now moves with the buyer's stock. If the buyer's shares fall, your put can move into the money even though the deal closed. My guide to adjusted options shows how to read the new contract.

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