OPEX Friday: How Monthly Expiration Changes the Tape

The first time I traded a monthly OPEX Friday, I thought my charts were broken. $SPY kept pushing toward the same strike, stalling, drifting back to it, stalling again. Every breakout I bought failed. Every breakdown I shorted failed. Price was glued to a number like it had a magnet inside it.

It did have a magnet inside it. That was my introduction to gamma pinning, and it changed how I trade the third Friday of every month.

Monthly options expiration, OPEX, is a different animal from a regular trading day. The tape behaves differently, the moves are weirder, and the setups I love on normal days need adjusting. Here is exactly what changes and how I adapt.

What monthly OPEX actually is

OPEX is the monthly expiration of stock and index options, on the third Friday of each month. On that day, a massive amount of open interest across thousands of strikes either expires worthless or gets exercised. For $SPY and $QQQ, the open interest at monthly expiration dwarfs a normal weekly expiry.

Why does that matter for an intraday trader? Because all that open interest creates gravity. Market makers who sold those options are hedged with stock, and as expiration approaches, their hedging activity pulls price toward the strikes with the most open interest. The bigger the open interest, the stronger the pull.

On a normal day, price moves on order flow and news. On OPEX Friday, price also moves on math. Billions of dollars of expiring contracts are doing arithmetic in the background, and that arithmetic shows up on my 5-minute chart as a magnet zone that will not let go.

One important distinction: weekly expirations carry a fraction of the open interest, so pinning is weak and the tape behaves almost normally. Monthly OPEX is the big one. Quarterly triple witching is the biggest of all. I scale my expectations to the size of the event.

For the full mechanics of how expiration day flows work, my expiration day gamma guide goes deeper. Here I will focus on what you actually do about it.

Gamma pinning explained simply

Here is the plain-English version. When market makers sell options, they hedge by buying or selling the underlying stock. As expiration gets close, an option that is near the money needs constant hedging, and that hedging pushes price back toward the strike.

Multiply that by millions of contracts and you get a pin. Price gets drawn to the strike with the heaviest open interest and just sits there, drifting in a tight range, shrugging off breakouts in both directions.

The key insight: pin levels are magnets, not walls. Price is attracted to them, but the attraction is not permanent. And when the pin breaks, usually late in the day, the unpin move can be fast and violent.

The OPEX Friday pattern

Almost every monthly OPEX Friday follows the same rhythm. Morning chop around the pin. Midday drift. Late-day unpin.

In the morning, price gravitates toward the heavy open-interest strikes. Breakouts fail. Breakdowns fail. The range compresses. This is the worst time to trade aggressively, because the pinning force is strongest and every directional bet gets faded back to the magnet.

Then, usually in the last hour or two, the pin lets go. Hedging pressure drops off as contracts roll or expire, and price is free to move. The unpin move can run hard in either direction, and it often runs further than anyone expects because the whole day of compressed energy releases at once.

This is why the last hour matters so much on OPEX. My power hour guide covers late-day trading in general, but on OPEX Friday the last hour is the main event, not the afterparty.

How I mark OPEX levels

Before the open on OPEX Friday, I do ten minutes of homework.

I look at where the big open interest sits. The round-number strikes near the current price are the usual suspects, because that is where retail and institutions both pile in.

I also note the previous day's high and low, because pin zones often overlap with obvious technical levels, and overlapping magnets are stronger magnets. My full process for marking those levels is in my previous day high and low guide.

Then I draw my pin zone on the chart: a band around the heavy strikes, not a single line. Price rarely pins to the exact penny. It pins to the neighborhood. Treating it as a zone keeps me from getting chopped up on wicks.

Want to watch me trade this live? I call these setups out in real time every morning inside the free Bulls Corner Discord. Get in free here, just drop your email and you're inside.

My OPEX Friday rules

Respect the pin zones. When price is grinding around a heavy strike, I do not fight it. The pin wins those fights all morning. I wait.

Expect the unpin move. The pin always lets go eventually. When it does, usually late in the session, the move can be fast. I want to be alert and positioned for the release, not exhausted from fighting the pin all morning.

Trade lighter. OPEX price action is weird. Fake breakouts are the norm, spreads can widen, and moves can reverse without warning. I size down and demand cleaner setups than usual. My notes on 0DTE timing and theta decay apply double on expiration days.

Do not chase morning breakouts. This is the rule that saves the most money. On a normal day, a clean breakout with volume is tradeable. On OPEX Friday morning, it is bait. The pin pulls price back, the breakout fails, and the chasers get swept. I need to see the sweep and the shift, same as always, but my bar for "clean" is higher.

The unpin is the trade. If I only take one trade on OPEX Friday, it is the late-day release from the pin. Price breaks away from the magnet with conviction, and that move has a full day of compressed energy behind it.

Monthly OPEX versus a normal Friday

Let me make the contrast sharp, because this is where traders go wrong.

On a normal Friday, my edge is the PSS framework on clean intraday structure. Sweeps, shifts, breaks, zones. The tape cooperates because nothing is distorting it.

On monthly OPEX Friday, the same framework works, but the timing shifts. Morning setups get polluted by pinning, so I take fewer of them. The afternoon becomes prime time instead of wind-down time, and my best setups come from the unpin, not the open.

Position sizing drops. Patience goes up. The number of trades goes down. I am trading the same game on a tilted table, so I adjust my stance instead of pretending the table is flat.

The mindset shift

Most traders hate OPEX Friday. The chop frustrates them, the fake breakouts stop them out, and by the afternoon they are either revenge trading or checked out.

I stopped fighting it. The pin is not my enemy. It is a schedule. I know when it grips the tape and when it lets go, so I conserve my energy for the release instead of spending it on the chop.

Respect the pin zones. Expect the unpin. Trade lighter. Take the one good trade instead of ten mediocre ones. That is the OPEX Friday adjustment. Same trader, same model, different clock.

If you want to see this live instead of reading about it, I trade $SPY and $QQQ 0DTEs every morning and call every step out loud. The free Discord is where it happens, join free.

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FAQ

What is OPEX in trading?

OPEX is monthly options expiration, on the third Friday of each month. A large amount of options open interest expires that day, which creates hedging flows that can pin price to heavy strikes and distort normal intraday price action.

What is gamma pinning on OPEX Friday?

Gamma pinning is when market maker hedging pulls price toward strikes with heavy open interest as expiration approaches. Price gravitates to the pin zone, breakouts fail, and the tape chops until the pin releases, usually late in the day.

Should you trade on OPEX Friday?

Yes, but differently. I trade lighter, skip morning breakouts near pin zones, and focus on the late-day unpin move when price breaks free of the magnet. Fewer trades, more patience, same framework.

What is the difference between monthly OPEX and weekly expiration?

Monthly OPEX carries far more open interest, so pinning is much stronger and the tape distortion is bigger. Weekly expirations behave almost like normal days. Quarterly OPEX, the triple witching months, has the strongest effects of all.

When does the OPEX pin usually break?

Typically in the last one to two hours of the session, as hedging pressure drops off. The unpin move can be fast and directional, which is why I save my energy and attention for the afternoon instead of fighting the morning chop.

Risk note: everything on this blog is educational content from my own trading experience, not financial advice. Trading options involves substantial risk of loss.