What is the contract multiplier?
In one line: The contract multiplier is the number of shares one options contract controls, normally 100, so a quoted option price and every gain or loss is multiplied by 100.
How it works
Option prices are quoted per share. But you can't trade one share's worth. A standard stock option contract covers 100 shares. That 100 is the contract multiplier.
So every number on the Options chain is secretly 100 times bigger:
- A premium of $1.20 is really $120 per contract.
- A $45 Strike price on one Put option means $4,500 to buy the shares if assigned.
- A $0.05 move in the option's price is $5 per contract.
Selling two contracts doubles all of it. Ten contracts means 1,000 shares.
The multiplier is normally 100 for US and Canadian stock and ETF options. After a stock split, a merger or a special dividend, an "adjusted" contract can carry a different number of shares or an odd strike. Your broker labels these, and they're best left alone until you understand them.
Every step of the wheel strategy runs on this number. Getting it wrong is the fastest way to sell a position far bigger than you meant.
An example (hypothetical)
An illustration, not a trade idea. Made-up stock XYZ trades at $50. You look at the 30-day $45 put. The chain shows a bid of $0.90.
| What you see | What it really means |
|---|---|
| Premium $0.90 | $90 collected per contract |
| Strike $45 | $4,500 of cash set aside per contract |
| Sell 3 contracts | $270 collected, $13,500 set aside, 300 shares if assigned |
Now the stock falls to $38 by expiry and you're assigned.
| Contracts sold | Premium kept | Loss on shares ($45 → $38) | Net |
|---|---|---|---|
| 1 | +$90 | −$700 | −$610 |
| 3 | +$270 | −$2,100 | −$1,830 |
Someone who thought "3 contracts, $0.90, that's small" is now holding $11,400 of stock worth less than they paid. The multiplier was in every number; it just wasn't printed.
Why it matters for sellers
The multiplier turns small quotes into real money, both ways. Three habits that keep it straight:
- Multiply the strike first. Before the premium, before anything, compute strike × 100 × contracts. That's the cash you need or the shares you'll hand over. If that figure doesn't fit your account, stop.
- Say premiums in dollars per contract. "$90" is honest. "90 cents" sounds like pocket change.
- Check the deliverable. On a normal contract it reads "100 shares". If it says anything else, it's an adjusted contract.
Index options and some ETF options also use 100, but their strike levels are large, so one contract can control a lot. Mini and micro contracts use smaller multipliers. Check before you sell.
Questions
Why do options contracts cover 100 shares?
It's the standard size set by the exchanges and the clearing house for stock options. Quoting per share keeps prices easy to read, and the contract standardizes the lot at 100.
Can an options contract be for a different number of shares?
Yes. After a split, merger or special dividend, an adjusted contract may deliver a different number of shares, cash, or shares of another company. Your broker marks these as non-standard.
How do I work out how much cash a cash-secured put needs?
Strike price × 100 × number of contracts. A $45 put is $4,500 per contract. Some brokers count the premium you collected toward that amount, others don't. Check how yours does it.
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