A standard U.S. equity options contract covers 100 shares of the underlying stock. That is the default set by the Options Clearing Corporation for every listed equity option, including options on American Depositary Receipts.1The Options Clearing Corporation. Equity Options Product Specifications Two things can change the answer for a specific contract you’re looking at: a corporate action that adjusts the deliverable, or an index option that never delivers shares in the first place.
Turning 100 Shares Into Dollars and Exposure
Option prices are quoted per share, so the number you see on the screen is not what you pay. Multiply the quoted premium by 100 to get the cash cost of one contract. An option quoted at $2.50 costs $250. One quoted at $7.90 costs $790.
Share exposure scales the same way. Five long calls control 500 shares of the underlying. Ten short puts obligate you to buy up to 1,000 shares if they’re assigned. Position sizing depends on getting this right; the difference between “one contract” and “1,000 shares of exposure” is the whole game.
When the Share Count Isn’t 100 Anymore
The 100-share deliverable holds until a corporate event forces a change. Stock splits, reverse splits, mergers, spinoffs, and special dividends can all alter what a contract delivers. When an event occurs, an adjustment panel of listing exchange representatives and one OCC representative modifies the contract terms so the total economic value of the position is preserved.1The Options Clearing Corporation. Equity Options Product Specifications
Splits and Reverse Splits
A 3-for-2 stock split raises the deliverable from 100 to 150 shares, and the strike price falls proportionally so the contract’s total dollar value is unchanged.2Securities and Exchange Commission. The Options Clearing Corporation on SR-OCC-2006-01 A reverse split moves the opposite way. In a 1-for-20 reverse split, the deliverable drops to 5 shares of the new, higher-priced stock, while the contract multiplier itself stays at 100.3The Options Industry Council. Splits, Mergers, Spinoffs and Bankruptcies
Spinoffs
A spinoff can leave the contract delivering shares of two companies. In one documented case, a parent distributed roughly 1.2071 shares of a spinoff for each original share held; the adjusted deliverable became 100 shares of the parent, 120 shares of the spinoff, and a cash payment covering the leftover fractional spinoff shares.4Federal Register. Self-Regulatory Organizations – The Options Clearing Corporation – Notice of Filing of Proposed Rule Change Concerning Adjustments to Cleared Contracts
Fractional Shares and Cash in Lieu
When an adjustment produces a fractional share, say 133.3333 shares from a 4-for-3 split, the fraction is eliminated and replaced with cash. The cash amount equals the fractional portion multiplied by the stock’s price on the ex-date. In a 4-for-3 split with the post-split stock at $60, the 0.3333 fractional share becomes roughly $20 added to the deliverable in cash. That cash-in-lieu payment goes to the buyer.2Securities and Exchange Commission. The Options Clearing Corporation on SR-OCC-2006-01
Spotting an Adjusted Contract
Adjusted contracts show up on brokerage platforms as non-standard options, marked with a numeral appended to the ticker symbol. Before you trade or exercise one, check the OCC’s adjustment memo for the symbol so you know exactly what the deliverable is. The strike, the share count, or both may differ from what the ticker alone suggests.
Contracts That Don’t Deliver Shares at All
Broad-based index options are not equity options and don’t deliver stock. SPX, Mini-SPX (XSP), and VIX options are cash-settled: at exercise or expiration, cash changes hands based on the difference between the exercise-settlement value and the strike price, multiplied by $100.5Cboe. Why Option Settlement Style Matters6Cboe. Settlement of Standard AM-Settled S&P 500 Index Options
The Mini-SPX (XSP) is worth calling out separately. Its contract size is 10, one-tenth of a standard SPX contract, which lets smaller accounts trade S&P 500 exposure without a full-sized position.7Cboe. XSP (Mini-SPX) Index Options It’s still an index option, not an equity option, so the number describes a cash multiplier rather than shares.
ETF options are a different story. Options on products like SPY are physically settled, so exercise or assignment moves 100 actual ETF shares per contract.5Cboe. Why Option Settlement Style Matters That distinction matters at expiration: cash-settled contracts can’t leave you with an unwanted stock position, but a physically settled contract requires the cash or margin to handle 100 shares each.
What 100 Shares Means at Exercise or Assignment
Exercising one call buys 100 shares at the strike price. Exercising one put sells 100 shares at the strike. The party on the other side is assigned and must deliver those shares for a call, or buy them for a put, in the same quantity. Once the exercise settles, the option is gone and a stock position replaces it in the account.
There’s also a default that catches people off guard. Under OCC Rule 805, any option that finishes in the money at expiration is exercised automatically through exercise-by-exception unless the holder submits contrary instructions to the broker beforehand.8Securities and Exchange Commission. Rule 1100 – Exercise of Options Contracts – Exhibit 5 A contract that closes just $0.01 in the money will still trigger it. A long call holder who intended only to speculate can end up owning 100 shares per contract on Monday morning, with a margin call if the account can’t fund the purchase.
Stock resulting from an exercise settles on a T+1 basis as of May 28, 2024, meaning one business day after the transaction.9Investor.gov. New T+1 Settlement Cycle – What Investors Need To Know A Monday exercise settles Tuesday. That short window is why knowing the share count of the contract you’re holding, and confirming it against any adjustment memo, is worth doing before the expiration bell rather than after.