Spotting an adjusted option contract
When a company splits, merges, spins off a division or pays a special dividend, the clearing house rewrites the terms of every contract already open on that stock. What is left is an adjusted contract: same chain, modified symbol, and a deliverable that may not be 100 shares. It will quote a premium that looks too good, and there is a reason for that.
Two pages on this site cover corporate actions and they do different jobs. The one in the assignment series explains what OCC does to your open position and why, sourced to the published adjustment rules. This one is about the chain you are looking at right now, before you have a position, and about the trade you should not put on.
What an adjusted contract is
A split, a merger for cash, a spinoff or a special dividend changes what a share is worth without changing what the company is worth. Left alone, that would hand a windfall to one side of every open contract. So the contract terms move instead: the strike, the number of contracts, or what one contract delivers.
The premium multiplier of 100 usually survives. The deliverable often does not. OCC / Options Industry Council, Splits, Mergers, Spinoffs and Bankruptcies FAQ has the published worked examples, and the one worth carrying around is the reverse split: a 1-for-10 leaves the strike, the contract count and the 100 multiplier alone and changes the deliverable to 10 shares. One contract, ten shares, same $100 multiplier on the premium.
How to recognise one
Four tells, roughly in order of how obvious they are.
The symbol has a suffix. Adjusted series get a modified root, usually the ticker with a digit appended, sitting alongside the standard series. Two chains for the same company, one of them with an odd symbol, is the loudest signal there is.
The deliverable is not 100 shares. Your broker shows this in the contract details, often as something like "100 shares plus $340 cash" or "37 shares of one company and 63 of another". If you have to open a detail panel to find out what a contract delivers, you are looking at an adjusted one.
The strikes are strange. Standard strikes are round. Adjusted ones land on things like $42.50 becoming $28.33 after a 3-for-2, and a chain with three decimal places in the strike column is not a normal chain.
The premium is too good. This is the one that gets people, and it is usually not premium at all. If the deliverable is 10 shares rather than 100, a $2.00 quote is $200 of obligation on a tenth of the stock, and a screen that assumes 100 shares will report a return roughly ten times reality.
The covered call that is not covered
This is the failure mode worth the whole page.
You own 100 shares. You are short one call. The company does a 1-for-10 reverse split. Now:
- Your 100 shares become 10 shares.
- Your short call still exists, at the same strike, with the same 100 multiplier.
- Its deliverable is 10 shares.
In that particular case the cover survives, because both sides moved together. Now run a 2-for-1 split instead: your 100 shares become 200, your one short call becomes two contracts at half the strike, and the cover still holds. The mechanics are designed to preserve exactly this.
Where it breaks is the messy actions. A spinoff turns the deliverable into shares of two companies while your account holds shares of two companies in the same ratio, which works until you sell one of them. A partial cash merger leaves a deliverable of shares plus a fixed cash amount, and the cash portion cannot be covered by stock at all. In those cases a position that was covered on Friday needs checking on Monday, and the check is reading the deliverable rather than trusting the position line.
Why every calculator on this site gives the wrong answer
Ours included, and it is worth being blunt about it. The covered call calculator assumes one contract equals 100 shares, because that is true of every standard listed equity option. Feed it an adjusted contract and the break-even, the static return and the annualized figure are all wrong by whatever ratio the adjustment applied.
The same goes for any screen, any delta-based rule of thumb, and any per-contract position sizing. Sizing rules that work in contracts stop meaning anything when a contract is not a standard lot.
The honest advice
Do not trade them.
Not because they are dangerous in some exotic way. Because they are illiquid, the spreads are wide, the deliverable takes real effort to confirm, every tool you own is quietly wrong about them, and there is no compensating advantage. The apparent premium edge is an artifact of the multiplier and it evaporates the moment you compute it correctly.
If you already hold one, because a corporate action happened underneath a position you put on legitimately, then read the mechanics page, confirm the deliverable with your broker rather than from a chain screenshot, and treat closing it as a job to be done at a fair price rather than a fast one.
And check for pending corporate actions before you open a position, not after. A merger vote scheduled inside your expiry is the same category of veto as an earnings date inside your window, and nothing in the delta column will warn you.
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 is an adjusted option contract?
A contract whose terms were rewritten by the clearing house after a corporate action such as a split, merger, spinoff or special dividend. The strike, the contract count or the deliverable can change, so one contract may no longer represent 100 shares.
How can I tell if an option contract is adjusted?
Look for a modified symbol with a digit appended, a deliverable that is not 100 shares, strikes with unusual decimals, and a premium that looks far better than the neighbouring strikes. The deliverable is the definitive test and it is in the contract details.
Why does an adjusted contract show such a high return?
Because the calculation assumes 100 shares. After a 1-for-10 reverse split the deliverable is 10 shares while the premium multiplier stays at 100, so any standard return calculation overstates the trade by roughly ten times.
Should I sell options on adjusted contracts?
No. They are thin, the spreads are wide, confirming the deliverable takes real work, and every standard calculator and sizing rule is wrong about them. The apparent premium advantage disappears once the arithmetic is done properly.
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 Options basics 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.