0DTE Expiration and Assignment - What Happens After the Close
Reviewed by Leon Moyer - Published October 9, 2026 - Last reviewed October 9, 2026
In this lesson
Explain what happens to an expiring 0DTE option after the close, and identify when a defined-risk spread can turn into a larger loss through assignment.
When a 0DTE option reaches the closing bell, trading in it stops but the outcome is not final yet. Options in the money by $0.01 or more are exercised automatically unless someone instructs otherwise, holders can still change their decision until an exercise cutoff of 5:30 p.m. Eastern at the latest, and assignments are worked out overnight. Cash-settled index options end in cash; ETF options end in shares, which is where most expiration-day surprises come from.
What time do 0DTE options stop trading?
On a regular trading day, it depends on the product:
- PM-settled S&P 500 index options (SPXW and XSP) stop trading at 4:00 p.m. Eastern on their last trading day. Rule 5.1 of the Cboe Options rulebook sets that last-day close; the same rule lets designated ETF options trade until 4:15 p.m.
- Options on some broad-market ETFs, such as SPY, QQQ and IWM, can trade until 4:15 p.m., expiring series included. Cboe's extended trading hours FAQ confirms that expiring ETF options trade until 4:15 p.m. while expiring SPXW options stop at 4:00.
- Most stock options stop regular trading at 4:00 p.m.
Early-close days differ, and some brokers stop accepting orders in expiring contracts earlier. Check Cboe's trading hours and your broker's rules.
How are expiring options exercised?
Two rules decide what happens to an option that expires in the money:
- Exercise by exception. The Options Clearing Corporation automatically exercises expiring options that are in the money by at least $0.01 per share, unless the clearing firm instructs otherwise. The Options Industry Council's exercise FAQ gives that threshold for equity options in customer accounts and for index options in all accounts.
- The exercise cutoff. FINRA's exercise cutoff notice gives holders of expiring equity options until 5:30 p.m. Eastern to make a final decision, including a "Contrary Exercise Advice" to exercise an option that would not be exercised automatically, or not to exercise one that would. Many brokers set an earlier deadline.
Between the close and that cutoff, news can move the stock or ETF in after-hours trading, and a holder can act on it. An option that closed slightly out of the money can still be exercised, and one that closed slightly in the money can be abandoned. Sellers find out which happened only when assignments arrive.
Expiration day after the closing bell
4:00 or 4:15 p.m.
Expiring options stop trading (4:15 for some ETF options, such as SPY)
Until 5:30 p.m.
Exercise decisions; after-hours news can move the stock
Overnight
OCC processes exercises and assigns sellers
Next morning
Shares or cash appear in the account
How does settlement differ between SPX and SPY?
Cboe's SPXW specifications describe the index options as cash-settled and European-style. SPX vs SPXW Options: AM vs PM Settlement Explained covers index settlement in more depth.
What is pin risk?
Pin risk is the uncertainty that comes when the underlying closes at or very near a short option's strike. The Options Industry Council's bear call spread guide warns that a seller "cannot know for sure" whether they were assigned until after expiration, and that the problem is sharpest when the stock is trading "just below, at or just above the short call strike." You might be assigned and hold shares you did not expect, or not be assigned after buying shares to prepare for it, and face an overnight move either way.
For share-settled spreads this matters even when the strategy is called defined-risk. The long option that caps the risk only protects you if it is exercised too. If the short leg finishes just in the money and the long leg just out of the money, one is exercised and the other expires.
Worked example
Assignment example: an XYZ 50/49 put spread held through the close
XYZ options are share-settled stock options. Earlier in the week you sold the XYZ 50 put for $0.50 and bought the 49 put for $0.20, a $30 credit. As a spread, its maximum loss at expiration is (1 - 0.30) x 100 = $70.
On expiration day XYZ closes at $49.80:
- The short 50 put is $0.20 in the money, so it is exercised automatically and you are assigned: you buy 100 XYZ shares at $50, or $5,000.
- The long 49 put is out of the money and expires worthless.
- At the close, the spread showed a $10 profit: you kept $30 of credit and owed $20 of intrinsic value.
After the close, XYZ reports bad news and opens the next morning at $47. You now own 100 shares bought at $50, a $300 loss on the shares. Add back the $30 credit and the result is a $270 loss, almost four times the spread's "maximum."
Illustrative and hypothetical. The ticker and prices are invented for teaching, and the figures exclude commissions, fees, margin interest and taxes, which reduce real results. Past or hypothetical outcomes do not indicate future results.
Assignment can remove a spread's loss limit. Once a short put is assigned without its long leg, you own 100 shares per contract, which can lose up to the strike x 100 minus the credit if the stock falls to zero. An assigned short call without its long leg leaves you short shares, and that loss has no limit. Cash-settled index options cannot leave you holding shares.
A defined-risk spread that stopped being defined
Loss per spread
If you lack the buying power for the shares, your broker may close the position for you, sometimes before the close, at a price you do not control. FINRA's 0DTE investor guide says a firm "may liquidate the position prior to the close of the regular trading session" when you do not have the funds or shares to meet the obligation.
How do you avoid surprises at 0DTE expiration?
- Close short options before the close when the underlying is near the short strike. Paying a few cents to exit removes the short leg's pin risk.
- Know your broker's cutoffs. Many firms set exercise deadlines, and some close or block risky expiring positions, well before the official times.
- Know how the product settles. Cash-settled, European-style index options cannot deliver shares; share-settled options can.
- Check your buying power for the worst case. An assigned short put needs cash for 100 shares per contract; an assigned short call delivers shares you may not own.
- Read the risk disclosure. Every options customer receives the OCC's Characteristics and Risks of Standardized Options, the document FINRA's 0DTE guide points investors to for options risks.
Check your understanding
A long SPY 500 call closes at $500.02 on expiration day. What happens if you do nothing?
Show answer
It is in the money by $0.02, at or above the $0.01 threshold, so it is normally exercised automatically: you buy 100 SPY shares at $500, unless you or your broker submit contrary instructions before the cutoff.
Why can't an SPX option leave you holding shares after expiration?
Show answer
SPX options are cash-settled. An in-the-money SPX option pays the in-the-money amount in cash, and because it is European-style it cannot be exercised before expiration.
In the XYZ example, why did a spread with a $70 maximum loss lose $270?
Show answer
Only the short put was exercised. The long put expired worthless, so it gave no protection when the shares bought through assignment fell from $50 to $47 overnight.
Key takeaways
- Expiring options stop trading at the close, but exercise decisions can change until a cutoff of 5:30 p.m. Eastern at the latest, earlier at many brokers.
- Options in the money by $0.01 or more are normally exercised automatically.
- Cash-settled index options settle in cash; ETF and stock options deliver shares, which can be held into an overnight gap.
- Pin risk can turn a share-settled "defined-risk" spread into a larger loss; closing near-the-money short legs before the bell avoids it.
Common questions
Can 0DTE options be assigned?
Yes, if they are American-style and settle in shares, as SPY, QQQ and IWM options do. A short option that finishes in the money is normally assigned at expiration. Cash-settled, European-style index options such as SPX are not assigned early and deliver no shares; an in-the-money option settles in cash.
What happens if my 0DTE option expires in the money?
Options in the money by $0.01 or more are normally exercised automatically unless you or your broker give contrary instructions. A share-settled call then buys shares at the strike and a put sells them; a cash-settled index option pays the in-the-money amount in cash.
What is pin risk in options?
The risk that the underlying closes very near a short option's strike at expiration, so you cannot know whether you will be assigned until the next business day. You may end up with an unexpected stock position, or none when you expected one, and face an overnight move either way.
Can my broker close my 0DTE options before expiration?
Yes. FINRA notes that if you lack the funds or shares to meet a potential exercise or assignment, your firm may liquidate the position before the close, at a price you do not choose. Brokers' policies and cutoff times differ, so read yours.