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Mergers, splits and adjusted contracts

When the underlying splits, merges or pays out something outside its normal practice, OCC adjusts the contracts already open so the economics survive the corporate action. Your strike, your contract count, or what a single contract delivers can all change overnight. The premium multiplier of 100 survives almost all of it.

Nobody reads about this until it happens to them, at which point they have a position whose terms are not the ones they agreed to and a chain that looks broken.

Why adjustments exist

A 2-for-1 split halves the share price. Without an adjustment, every call struck above the new price would be instantly worthless and every put below it instantly rich, for a corporate action that changed nothing about the company. So the contract terms move instead.

The adjustments below all come from OCC / Options Industry Council, Splits, Mergers, Spinoffs and Bankruptcies FAQ.

Whole-number splits

The published example: a $45 stock with a $50 strike goes through a 2-for-1. Afterwards the stock is $22.50 and the strike is $25, and you are short twice as many contracts as before.

For a covered call writer this is the gentle case. You held 100 shares and were short one call. You now hold 200 shares and are short two calls, at half the strike. Still covered, same exposure, twice the line items.

Reverse splits

Here the machinery works the other way and produces something that looks wrong on the screen. On a 1-for-10 reverse split: the strike does not change, the contract count does not change, the premium multiplier stays at 100, and the deliverable becomes 10 shares per contract.

Your 100 shares became 10. Your short call now delivers 10. You are still covered, which is the part people panic about unnecessarily. What has changed is that a contract quoted at $1.00 now costs $100 to buy back while controlling 10 shares of stock, so every intuition you have about the relationship between the premium and the position is off by a factor of ten until you recalculate.

This is the classic non-standard deliverable, and it is the one most likely to make you misprice a roll.

Cash mergers

When a company is bought for cash, OCC / Options Industry Council, Splits, Mergers, Spinoffs and Bankruptcies FAQ says options on it "will generally be adjusted to require the delivery upon exercise of a fixed amount of cash."

The contract stops being an option on a stock and becomes a claim on a number. There is no volatility left in a fixed cash amount, so the extrinsic value goes to approximately nothing, the chain effectively stops trading, and both sides sit there until settlement.

For a premium seller this ends the position as a source of income. There is no next cycle, the wheel stops turning on that name, and the capital is stuck until the deal closes. Not a loss, usually. Just a dead end that arrives without warning.

Spinoffs, and everything else

Spinoff: the deliverable becomes shares of both the parent and the new company, with the strike and the contract count unchanged. One contract now delivers a small basket. Fine in principle, awkward if you own only the parent shares and assumed you were covered.

Bankruptcy: while the shares still trade, options settle in those shares as normal. If the court cancels the equity, calls become worthless. Note which side of that a short put leaves you on.

Ordinary cash dividends: no adjustment. This is the one people expect and it does not happen. The regular quarterly payout is already reflected in what the options were priced at, so nothing is rewritten. A payout declared outside a company's normal practice is treated differently, and OCC decides that case by case rather than by a formula you can apply yourself. If a special dividend is announced on a name you are short, read OCC's memo on that specific action rather than any general rule, this page included.

What a seller should actually do

None of this is common. All of it arrives on a Monday morning with no email, which is the argument for recognising it in ten seconds rather than half an hour.

OptionsKing scores every candidate strike on a deterministic 0 to 100 scale, blends that score with the return on the capital the trade ties up, and shows you the highest-ranked handful. There is no minimum score. How it works covers what the ranking does and does not tell you.

Questions people actually ask

What happens to my options in a stock split?

In a whole-number split such as 2-for-1, the strike is divided by the ratio and your contract count is multiplied by it, while each contract still delivers 100 shares. A covered call writer ends up with twice the shares and twice the calls at half the strike.

What happens to options in a reverse split?

On a 1-for-10 reverse split the strike, the contract count and the 100 premium multiplier all stay the same, and the deliverable drops to 10 shares per contract. You are still covered, but the relationship between the quoted premium and the position size has changed by a factor of ten.

What happens to options when a company is acquired for cash?

The contracts are generally adjusted to deliver a fixed amount of cash on exercise. Volatility and extrinsic value disappear, the series stops trading in any meaningful way, and the position is effectively frozen until settlement.

Are option strikes adjusted for dividends?

Not for ordinary cash dividends. Regular quarterly payouts are already in the option price and nothing is rewritten. Distributions outside a company normal practice are handled case by case by OCC, so read the memo for the specific action.

Sources

Rules and thresholds above were checked against these documents on August 4, 2026. Exchange and broker rules change. Confirm anything you are about to act on with your own broker.

Keep reading

Do the math on your own trade

Every price in this article is an illustrative worked example, not a quote. Read Assignment and expiration for the rest of the series, and the disclaimer before you act on any of it. Selling options carries real risk of loss, and the loss can be far larger than the premium you collected.