How Splits, Dividends and Cash Settlement Change an Option Contract

Delivery or cash: the two ways a contract ends

A stock or ETF option ends in shares. FINRA's options guide says exercising an equity option means buying or selling shares of the underlying, that a standard contract equals 100 shares, and that in-the-money equity options are generally exercised automatically at expiration. The money follows the shares: a call with a 100 strike needs 10,000 USD to exercise, and that cash is due when the exercise happens. Equity options are American-style, so the holder can exercise on any day before expiration, and brokers set their own cut-off times for doing so.

An index has no shares to hand over, so an index option ends in cash. FINRA says index options are cash-settled, which means exercise produces a cash payment instead of the exchange of a security, and that they generally trade European-style, settling at expiration on the value of the index at the open or at the close. The CFTC defines cash settlement as the short paying the long a cash amount based on the level of an index or a price, by a procedure the contract specifies. Suppose an index call with a 5,000 strike and a multiplier of 100 settles at 5,060: the holder receives (5,060 - 5,000) x 100 = 6,000 USD and no shares move.

The same exposure can end both ways. FINRA uses the S&P 500 pair as its example: options on the SPY exchange-traded fund are American-style and settle in SPY shares, while options on the S&P 500 index itself are European-style and settle in cash. A trader who sells one of each against the other is holding two contracts with different exercise rules and different endings.

AM and PM settlement

Cash settlement needs a number, and when that number is struck matters. Under AM settlement, FINRA explains, the settlement value comes from opening prices on expiration day while the option itself stops trading the day before. Broad-based index options such as SPX stop trading on Thursday and settle on Friday morning's opening prices of the index components, so news between Thursday's close and Friday's open lands on a position nobody can trade.

Under PM settlement the value comes from the closing price on expiration day and the option trades until the close at 4:00 p.m. Eastern. That is the standard for stock options. It removes the overnight gap but brings pin risk instead: when a stock closes at or very near a strike, a buyer has to decide whether to exercise without knowing the next open, and a seller does not know whether assignment is coming.

When the stock changes underneath the contract

A split, a reverse split or a stock dividend changes what one share is, so the contract has to change with it. FINRA Rule 2360 says a stock option contract written for 100 shares continues to be considered one contract throughout its life even when the number of shares it covers is adjusted to reflect stock dividends, stock splits, reverse splits or similar actions by the issuer. The adjustments themselves are made by the Options Clearing Corporation under Article VI, Section 11A of its by-laws, and the same rule says open orders in an adjusted class are adjusted on the ex-date by the amount the OCC specifies, unless the customer instructs otherwise.

The arithmetic that has to survive is the aggregate exercise price, which FINRA defines as the exercise price times the number of units the contract covers. One contract on 100 shares at a 50 strike carries an aggregate exercise price of 5,000 USD. After a 2-for-1 split the same stake is 200 shares at 25. Our stock split guide describes the usual whole-number result, more contracts at a proportionally lower strike: two contracts x 100 shares x 25 is still 5,000 USD.

A reverse split runs the other way, and the contract count can hide it. In a 1-for-10 reverse split, 100 old shares become 10 new ones. Before the split, one contract on 100 shares at a 2.00 strike carries an aggregate exercise price of 200 USD. An adjustment that keeps the stake the same has that contract cover 10 new shares for the same 200 USD in total, which works out to 20 USD a new share. FINRA's options rule keeps counting it as one contract, so the count in your account can stay at one while each contract no longer delivers 100 shares. Read the adjusted terms the OCC specifies for that event before you trade the contract or price it with a calculator that assumes 100 shares; the split calculator handles the share arithmetic.

Dividends and early assignment

A regular cash dividend does not change the contract, but it changes who might exercise it. FINRA warns sellers that the risk of assignment is higher the day before a stock's ex-dividend date, because holders of in-the-money calls may exercise early to collect the payout, and that the same risk exists around other corporate actions that affect the price, such as a merger or an acquisition. FINRA's guide to assignment adds that a holder can exercise on any day, even while trading in the underlying is halted, and that early exercise can follow shares becoming hard to borrow ahead of a pending corporate action.

The dates come from the stock side. Our ex-dividend date and record date entries walk through how the T+1 settlement cycle sets the cutoff, and the dividends tool shows the declared dates for any ticker. A seller of a covered call who knows the ex-date can see the assignment window coming; one who does not finds out from the broker.

Cash paid outside the regular schedule raises a different question: does the contract itself change? For any specific distribution that is the OCC's decision under the same by-law section. Check the terms it specifies for that event rather than assuming a special dividend is, or is not, adjusted for.

Expiration cycles and settlement clocks

FINRA lists the usual cycles. Monthly options expire on the third Friday of each month. Weekly options usually list with at least a week to run, most often expire on a Friday for single stocks, and the most liquid products can list up to five consecutive weeklies. Daily options, which expire the day they list, are offered only on indexes. LEAPS run up to two years and eight months.

The stock leg runs on its own clock. The SEC moved the standard settlement cycle for most broker-dealer securities trades from two business days after the trade date to one, with a compliance date of 28 May 2024, so a share purchase on Monday settles on Tuesday. Index cash settlement has no share leg at all.

Six questions before trading an adjusted or cash-settled contract

What does one contract deliver: 100 shares, a different share count, cash, or a mix? What multiplier turns the price into dollars? Is it American-style or European-style? Does it settle on the open or the close? Is there a corporate action with an ex-date before expiration? And what is your broker's exercise cut-off time?

Each answer is printed somewhere: in the contract's terms, in the OCC's adjustment terms for an event, and in your broker's rules. If one of them is missing, the price on the screen is a price for a contract you have not identified yet. The options profit calculator assumes a standard contract, so run an adjusted one through it only after converting it to the shares it really covers.