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Key Takeaways
- OCC publishes the effective date and exact terms for each contract adjustment.
- A whole-number forward split can multiply contracts and divide strikes while retaining a 100-share deliverable.
- The worked 3-for-2 split changes one contract’s deliverable from 100 to 150 shares, with a $60 strike and a 100 premium multiplier.
- Non-ordinary cash dividends use the adjustment specified by OCC, including strike reduction or a cash deliverable.
- Compare total exercise cost with the value of the complete adjusted deliverable.
What is an option adjustment?
An option adjustment is a change to a listed option’s terms that carries the contract through a corporate action such as a stock split, a non-ordinary cash dividend, a merger or a spinoff. The adjustment can change the strike, the contract count or the deliverable, and it aims to leave the economics of the position unchanged across the event.
OCC publishes the applicable contract count, strike, multiplier, deliverable and effective date in an Information Memo.
The deliverable is the package transferred on exercise. It can contain a different share quantity, shares in another company, cash or a combination. The premium multiplier converts the option quote into the amount paid for the contract.
Formula
Worked 3-for-2 split: deliverable = 100 × 3 / 2 = 150 shares; exercise cost = $60 × 100 = $6,000; adjusted-call intrinsic value per contract = max(0, 150 × share price − $6,000).- The example retains one contract, a $60 strike and a 100 premium multiplier.
- At a $40 post-split share price, 150 shares are worth $6,000.
- At $45, the same deliverable is worth $6,750 and call intrinsic value is $750 per contract.
- Use the OCC memo’s actual quantities, cash components, strike and multiplier for each adjustment.
Option adjustment example: a 3-for-2 split
A company declares a 3-for-2 stock split. A trader holds one XYZ 60 call on the standard 100-share deliverable while XYZ trades at $60.
- Cost to exercise before: $60 strike × 100 multiplier = $6,000 for 100 shares worth $6,000
- New deliverable: 100 × 3 / 2 = 150 shares
- Strike and contract count: unchanged at $60 and one contract
- Cost to exercise after: $60 × 100 = $6,000 for 150 shares worth $40 each, or $6,000
The adjusted contract delivers 150 shares for the same $6,000 exercise payment. At the split-adjusted $40 share price, the deliverable remains worth $6,000. At $45, its intrinsic value is $750. The contract’s strike and the stock’s share price use different units after this adjustment.
At a later share price of $45, the deliverable is worth $6,750. Subtract the $6,000 exercise payment to find $750 of call intrinsic value. This calculation captures the adjusted contract’s economics directly.
How splits, dividends and mergers change option terms
A whole-number forward split commonly increases contract count and reduces strike. A reverse or fractional split changes the deliverable under the published terms. Mergers and spinoffs introduce the specified replacement shares or cash.
Cash-distribution adjustments follow OCC’s classification and size rules. Strike reduction is the preferred treatment when the non-ordinary dividend amount is known and the resulting strike stays positive. Cash is added to the deliverable in the alternative treatment. Use the class-specific memo to select the correct calculation.
How to compare adjusted contracts with standard ones
Read the option chain alongside the adjusted terms. Calculate premium with the quoted-price multiplier and intrinsic value with the complete deliverable. In the example, the multiplier stays at 100 while the deliverable grows to 150 shares.
When reviewing options flow, identify adjusted symbols before comparing strikes or share exposure. Record the full deliverable for exercise planning and apply it explicitly in the position’s payoff calculation.
Limitations of option adjustments
- After an adjustment that changes the deliverable, the strike and the share price use different units. In the example, the $60 strike sits above the $45 share price while the call holds $750 of intrinsic value, so moneyness has to come from the complete deliverable.
- OCC decides each adjustment, and the class-specific memo governs it. Read the memo before trading an adjusted series; the split, dividend and merger patterns above are the common treatments.
- Expect no adjustment for an ordinary dividend. Ordinary recurring cash dividends do not normally trigger one, so their effect on the share price stays in the option’s value.
- A quote, screen or flow print that assumes 100 shares per contract misstates an adjusted contract’s exposure: the example call controls 150 shares. Check the deliverable before sizing from it.
Bottom line
An option adjustment keeps a listed contract working through a corporate action by changing its strike, contract count or deliverable. Read the OCC memo for the exact terms, and value an adjusted contract from its complete deliverable and exercise payment, not from its strike and the share price alone.
Clear answers
Frequently Asked Questions
Sources and Further Reading
- OCC memo 54262: Cash-dividend adjustment policy
- OIC: Splits, Mergers, Spinoffs & Bankruptcies
- OIC: Splits Happen
- Fidelity: Options Contract Adjustments
How entries are sourced, calculated and updated: editorial methodology.