Options Expiration October 16, 2026: What the S&P 500 Actually Does on Expiration Fridays

Friday, October 16, 2026 is the monthly options expiration, the third Friday of the month, when the standard October stock and index options stop trading. It arrives at the end of a loud week: the big banks report Tuesday, the September CPI report lands Wednesday, and retail sales, producer prices and jobless claims all hit at 8:30 AM Thursday. Expiration Friday has a reputation for wild swings. We counted every monthly expiration since 2000, 321 of them, to see whether the reputation is earned.

The short answer: it is not. The S&P 500's median move on expiration Friday is +0.04%, against +0.08% on every other Friday and +0.06% on every other trading day. It closed higher on 52% of expiration Fridays, versus 55% of other Fridays. A move of 1% or more happened on 26.5% of expiration Fridays and 27.5% of all days. Expiration day is, by the numbers, an ordinary Friday. The quarterly version, triple witching, leans a touch softer; October's expiration leans a touch firmer. Neither is a trade.

What options expiration actually is

Listed options have a fixed life. Monthly contracts expire on the third Friday of the month, and on that day any option still open is either exercised, closed, or lapses worthless. In March, June, September and December the monthly stock and index options expire on the same day as index futures, which is why those four Fridays are called triple witching. The folklore says that dealers hedging those positions, and traders rolling or closing them, pile up volume at the open and the close and push prices around.

Two things have changed since that folklore formed. First, Cboe now lists S&P 500 index options that expire every trading day, so the hedging activity that used to concentrate on one Friday a month is spread across the whole month. Second, the index has become far more dominated by a handful of very large stocks whose own option expirations are what move the tape. The third Friday still matters for the contracts you hold. It no longer marks a special day for the index.

The count: 321 expiration Fridays, 2000 to 2026

Rules: S&P 500 daily closes from Yahoo Finance, January 2000 through October 2, 2026. Expiration day is the third Friday of each month, or the Thursday before it when that Friday was a market holiday (Good Friday falls on the third Friday some years). The move is close to close from the prior day. We compare expiration Fridays with the other 1,036 Fridays in the sample and with all 6,727 trading days.

• Expiration Friday: median +0.04%, higher on 52.0% of days, a move of 1% or more on 26.5% of days, standard deviation 1.05%.
• Other Fridays: median +0.08%, higher on 54.8%, 1% moves on 29.1%, standard deviation 1.14%.
• All trading days: median +0.06%, higher on 53.7%, 1% moves on 27.5%, standard deviation 1.21%.
• Triple witching (the 107 quarterly expirations): median -0.01%, higher on 48.6%, 1% moves on 27.1%. The weakest group, but the gap is a few hundredths of a percent and a few percentage points of hit rate.
• The other 214 monthly expirations: median +0.07%, higher on 53.7%. Indistinguishable from an ordinary day.

The Monday after: median +0.03%, higher 51.7% of the time, 1% moves on 30.8% of days. A slightly livelier day than expiration itself, which fits the idea that positions get re-established after they expire, but still inside the normal range.

Expiration Fridays are, if anything, slightly calmer than other days. The standard deviation of their moves is the lowest of any group we measured. The famous expiration-day volatility does not show up in two and a half decades of index closes.

October's expiration in particular

There have been 26 October expirations since 2000. The S&P 500 closed higher on 17 of them (65%), with a median move of +0.30%, better than the all-expiration median. The biggest October expiration-day moves were +2.37% in 2022, the Friday the market was deciding the bear-market low was in, and -2.56% in 2007, two weeks after the all-time high that preceded the financial crisis. The 2023 expiration fell 1.26% during that October's rate scare; 2024 and 2025 were up 0.40% and 0.53%.

Twenty-six observations is a small sample, and a 65% hit rate on 26 coin flips is well within chance. We report it because people search for it, not because it means anything for October 16.

The week is more interesting than the day

The five trading days leading into an expiration Friday have a median gain of +0.32% and finish higher 57% of the time, both better than the day itself. The week after an expiration runs a median +0.21% and is higher 54.5% of the time. In other words, expiration week has historically been a mildly positive stretch, and the Friday that names it is the least remarkable day in it.

For October 16, 2026 the week's content matters far more than its label. Tuesday brings JPMorgan, Wells Fargo, Goldman and Johnson and Johnson, the start of the third-quarter bank season. Wednesday is the inflation print the Fed will carry into its October 27 to 28 meeting. Thursday stacks four economic releases into one minute. By Friday the market will have digested all of that, with the index sitting near a record and Brent above $100. If October 16 is a big day, it will be because of what landed Tuesday through Thursday, not because contracts expired.

What this means if you hold options into Friday

The index may not care about expiration, but your positions do. Three practical points we have learned running automated trading inside members' own brokerage accounts:

• Decide before Friday, not on it. An in-the-money option you still hold at the close will usually be exercised automatically, which can leave you long or short stock you did not plan to own over the weekend. Set the close or roll earlier in the week.
• Single stocks can pin. The index does not move on expiration, but an individual stock with a large open-interest strike nearby can hover at that strike into the close as hedges unwind. That is a stock-level effect, and it fades by Monday.
• Do not chase the expiration-day story. With a 52% up rate and a median of four hundredths of a percent, there is no edge in buying or selling the index because it is the third Friday. A stop that already exists handles the day exactly as it handles any other.

JorgAI trades stocks, not options, and the rules it enforces (a stop and a target on every position, position sizes set by you) do not change on expiration Friday or any other calendar quirk. If that is the kind of consistency you want from your own account, you can set your rules up in a few minutes and have them in place before Tuesday's bank reports.

Quick answers

When is options expiration in October 2026? Friday, October 16, 2026, the third Friday of the month. The next quarterly expiration (triple witching) is December 18, 2026.

Does the stock market go down on options expiration day? Not as a rule. Since 2000 the S&P 500 closed higher on 52% of monthly expiration Fridays with a median move of +0.04%, in line with any other day. Quarterly expirations were up 49% of the time with a median of -0.01%.

Is options expiration day volatile? Less than average. A move of 1% or more happened on 26.5% of expiration Fridays versus 27.5% of all trading days, and expiration Fridays had the lowest standard deviation of any group we measured.

What is triple witching? The four Fridays a year (March, June, September, December) when monthly stock options, index options and index futures all expire together. Since 2000 those days have a median S&P 500 move of -0.01%.

Data: S&P 500 daily closes from Yahoo Finance, January 2000 through October 2, 2026, computed by JorgAI. Past patterns do not predict future returns. This article is education, not investment advice.