Delta, Gamma, Theta, Vega — plain English (no textbook definitions)
u/PropertyPrompts ·
Reddit — r/options
· March 13, 2026 at 14:51
· ⬆ 143 pts
· 💬 38 comments
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Summary
The post is an educational primer on the option Greeks (Delta, Gamma, Theta, Vega), explaining them in simple, non-technical terms. The author's goal is to provide a practical reference for traders.
The author's thesis is that understanding how the Greeks interact is crucial for evaluating trades, highlighting the conflict between factors like Vega and Theta around events like earnings.
Quality assessment: This is educational content, not research or due diligence (DD). It's a simplified explanation of established financial concepts, best classified as noise from a trade-sourcing perspective.
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Been trading options for 2 years and I still catch myself Googling the Greeks. So I wrote these out in plain English for myself. Maybe useful for others.
Delta (\~0.50 ATM): How much your option moves per $1 stock move. A 0.50 delta call gains $0.50 if stock goes up $1. Simple.
Gamma: How fast delta changes. High gamma = your delta is moving fast. This is why ATM options explode in value right before expiration.
Theta: Time decay. Every day you hold a long option, you lose theta. Selling options = theta works FOR you. This is why theta gang exists.
Vega: Sensitivity to implied volatility. Buy options before earnings (IV goes up = vega profits). Sell options after earnings (IV crush hurts buyers, helps sellers).
The part nobody explains: these don't work in isolation. A high-vega trade going into earnings + high theta on a weekly = you're fighting two forces at once.
Happy to discuss how to use all four together when evaluating a trade.