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My stock split while I had options open. What did my contract turn into?

A stock split does not cancel or change the value of your option. The contract is adjusted so it still covers the same slice of the company. The numbers on the screen change; the deal does not.

Options guide · 7-minute read · Updated 2026-10-26

The short answer

Your option survives a split. The options clearing house adjusts it so the total value is the same the moment after the split as the moment before.

For a plain split like 2-for-1, the fix is simple: you now have twice as many contracts, each with half the strike, each still for 100 shares. For messier splits and reverse splits, the contract itself gets changed, and that's where people get confused.

What a plain split does to your contract

Take a 2-for-1 split. Every share becomes two shares, each worth half.

Your total position is the same. You controlled 100 shares' worth at $110; now you control 200 shares' worth at $55. The dollar value of the premium you collected is unchanged.

The same thing happens with your shares. If you were covered with 100 shares before, you hold 200 after, and your two calls are still fully covered. A 4-for-1 or 10-for-1 split works the same way, with four or ten contracts.

When the contract itself changes

Not every split is a whole number. A 3-for-2 split can't be turned into a clean number of contracts. So instead of changing how many contracts you have, the clearing house changes what one contract delivers.

• The contract might now cover 150 shares instead of 100.
• The strike usually stays where it was; the extra shares are what keep the value the same.
• The option often gets a new symbol with a number on the end, like "XYZ1".

Reverse splits go the other way. In a 1-for-10 reverse split, one contract might now deliver only 10 shares at the old strike. The ticker usually gets that "1" too.

These adjusted contracts are a nuisance for sellers. Very few people trade them, so the bid-ask spread gets wide and Open interest dries up. The clean "standard" chain restarts with the new share price, and the adjusted one sits off to the side until it expires. Learn to spot it in how to read an options chain.

A worked example (an illustration, not a trade idea)

You own 100 shares of a made-up stock, XYZ, bought at $100. You sold one 45-day call with a $110 strike for $2.00, collecting $200. Ten days in, XYZ splits 2-for-1 at $104.

The morning after, your screen shows: 200 shares at a cost of $50 each, and two short calls with a $55 strike. Your $200 premium is still $200. Nothing is gained or lost by the split itself.

Then the stock moves. Here's the position at expiry, in post-split prices:

Compare that to the table you'd have drawn before the split with one contract: a loss of $1,800 at $80, break-even at $98, a cap at $110. Identical. The split only changed the labels.

What to check the morning after

1. Count the contracts. If you had one and now see two, that's a clean split. Good.
2. Read the deliverable. If the symbol has a number in it, or the contract says anything other than 100 shares, it's adjusted. Note what one contract now delivers.
3. Check you're still covered. After a plain split your shares split too, so you are. After an odd split, confirm the share count matches what the calls can deliver.
4. Recalculate your cost basis per share. Divide by the split ratio. Write it in your journal.
5. Don't rush to close. An adjusted contract with a wide spread will cost more to buy back than it's worth. Letting it run to expiry is often the cleaner path.

If anything on the screen doesn't add up, the clearing house publishes a short memo for every adjustment. Your broker can point you to it.

What to do before the next split

A split is announced weeks ahead. If you'd rather not hold an option through one:

• Check the company's news page before you sell a 45-day option. The date is public.
• Prefer expiries that end before the split date.
• If you're mid-trade, you can close early. The split won't hurt you, but adjusted contracts are harder to manage afterwards, especially on a reverse split.

A reverse split is also a signal about the business. A company that needs to shrink its share count to keep a listing is often one you wouldn't want to be assigned on. For a seller, that question matters more than the contract math.

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