Lesson 5 of 5

How Greeks Change as Expiration Approaches

The Expiration Effect on Greeks

As expiration gets close, every Greek shifts -- and not always in your favor. The final 7-10 days before expiration is when things get unpredictable. Understanding what happens here is the difference between a disciplined wheel trader and someone who gives back profits at the worst time.

Delta Near Expiration

Delta goes binary. OTM options collapse toward 0 delta. ITM options lock in near -1.0 (for puts). Options right near the strike? They become a coin flip. A $1 move can flip you from 'safe' to 'assigned.' This is gamma doing its thing -- and it's why I don't like holding near-the-money positions into the final days.

Theta Near Expiration

Theta is at its peak in the final days. An option decaying $4/day at 30 DTE might be decaying $10/day at 5 DTE. Sounds great, right? Here's the catch: you're only chasing a small amount of remaining premium while exposed to maximum gamma risk. The risk/reward flips against you. This is why the 50% rule exists.

Theta acceleration

Theta ~ Premium / sqrt(DTE) | As DTE shrinks, daily decay per dollar of remaining premium increases dramatically

Gamma Near Expiration

Gamma spikes hard for near-the-money options. A $1 stock move that changed your P&L by $20 at 30 DTE might change it by $60 at 2 DTE. Same stock move, 3x the impact. I've seen wheel traders give back weeks of profit in a single afternoon because they held into expiration week. Don't be that person. Close or roll before the final week.

Vega Near Expiration

Vega shrinks toward zero near expiration. With almost no time left, IV changes barely affect the price. This means your focus shifts entirely from 'what's IV doing?' to 'where is delta and how fast can gamma move it?' Near expiration, it's all about the stock price relative to your strike.

The Practical Playbook

Sell at 30-45 DTE when theta is ramping and gamma is tame. Close at 50% profit or 14-21 DTE, whichever comes first. Roll to the next cycle if you want to stay in the trade. This keeps you in the 'theta-friendly, gamma-safe' zone at all times. I've been running this playbook for years and it works.

Delta: Goes binary near expiration. Near-the-money positions become a coin flip. High assignment uncertainty.
Theta: Peaks in the final days, but you're scraping pennies while sitting on a gamma landmine.
Gamma: Spikes for ATM options. Small stock moves = massive P&L swings. This is where blow-ups happen.
Vega: Shrinks to near zero. IV changes don't matter much anymore -- it's all about the stock price now.

Near-Expiration Scenario

You sold a PLTR $90 put (30 DTE) for $2.80 when PLTR was at $98. With 3 DTE left, PLTR is at $91 and the put is worth $1.10. Delta is -0.42, gamma is 0.11, theta is -$0.18. You've captured 61% of max profit. But look at that gamma -- a $2 drop in PLTR could push delta to -0.64 and the put to $2.50+. You'd go from a nice winner to barely breaking even in one bad afternoon. Close it. Take the 61% win. Sell a fresh 30-DTE put tomorrow.

The short version

•Near expiration, delta goes binary, theta peaks, gamma spikes, and vega disappears.
•The risk/reward of holding through the final week is terrible for sellers. Don't chase the last few cents.
•Close at 50% profit or before 14 DTE. This one rule has saved me more times than I can count.
•Roll to a new cycle instead of sweating through the final days.

Quick Check

1/3

Which Greek poses the greatest risk to premium sellers in the final week before expiration?

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