🔤Options 2/5 — The Greeks Made Simple
This is part 2 of 5 of the options course. In part one we covered what options are. Now we add the "dashboard" — the Greeks. You don't need to be a mathematician. Just understand what each one measures and you'll see an option's risk before you open it.
Reminder: Options can expire worthless and lose 100% of the premium invested. This text is educational and descriptive, not investment advice or an instruction to buy/sell. The numbers are illustrative.
Why Greeks at all
An option's price doesn't change only with whether the stock rises or falls. It changes with four forces at once: the stock's move, passing time, the change in expected volatility, and acceleration. The Greeks are the names of these forces. Once you read them, you stop guessing and start estimating.
1. Delta (Δ) — sensitivity to the stock's move
Delta tells you how much the option price moves when the stock moves $1.
- A call has a delta of 0 to +1. Delta 0.5 ≈ the option adds about $0.50 when the stock adds $1.
- A put has a delta of 0 to −1 (rises when the stock falls).
Example: stock $100, you buy an OTM call with strike $105 and delta 0.30. When the stock jumps to $101, the option gains roughly $0.30. A deep-ITM call with delta 0.90 would behave almost like the stock itself.
2. Theta (Θ) — the price of passing time
Theta tells you how much the option loses each day simply because time passes — even if nothing happens to the stock.
🧊 Analogy — an ice cube. The option is an ice cube on the table. Even if the room is calm, it slowly melts. The closer to expiry, the faster (decay accelerates in the final weeks).
- For the buyer, theta is the enemy — every morning you lose a sliver of value.
- For the seller, theta is a friend — they collect exactly what is "melting" off the buyer.
3. Vega — sensitivity to volatility
Vega tells you how much the option price changes when implied volatility (IV) changes by 1 point. IV is the market's "expected nervousness" — how big a move it anticipates.
- High IV = expensive options (the market expects a big move, typically before earnings).
- When IV deflates after the event, options get cheaper — even if the stock went the right way. This deflation is called IV crush and is the topic of part 3.
4. Gamma (Γ) — how fast delta changes
Gamma tells you how fast delta itself changes as the stock moves. It's the "acceleration".
- High gamma (typically near the strike and near expiry) means delta — and therefore risk — changes sharply. A position can "flip" in a moment.
- Low gamma (deep ITM or OTM, long expiry) = calmer behaviour.
5. How the Greeks work together
You never read a single letter alone. A typical OTM-call buyer before earnings faces a triple combination:
- Theta eats value every day,
- Vega exposes them to IV crush after the announcement,
- Delta only helps if the stock moves far enough.
6. Quick cheat-sheet
| Greek | Measures | Helps the buyer when… | Hurts the buyer when… |
|---|---|---|---|
| Delta | reaction to stock move | the stock goes your way | the stock goes against you |
| Theta | loss to time | (never — always eats away) | you wait and nothing happens |
| Vega | reaction to IV change | IV rises after you buy | IV deflates after you buy (crush) |
| Gamma | acceleration of delta | you're right near the strike | you're on the wrong side near the strike |
7. Takeaways
- Greeks aren't a forecast — they are sensitivities. They say "if X happens, the option reacts like this".
- Theta and vega ruin the most beginner purchases (waiting + expensive IV before earnings).
- Before you open an option, ask three questions: How far must the stock move (delta)? By when (theta)? And am I overpaying for IV (vega)?
Next: Part 3 — IV and IV crush around earnings.
---
★ Educational content — not investment advice. Options can lose 100% of the amount invested. Past results do not guarantee future ones. Consult a licensed advisor before any decision.
Want to know more? Ask the QMA AI advisor
The advisor knows the whole platform and its data. If the answer is not in the QMA database, it looks it up and explains it in plain language.
Open the AI advisor →Related articles
Part one of the options course: what a call and a put are, strike, expiration, premium, ITM/OTM. On a $100-stock example we show both the leverage and the risk of a 100% loss — in plain language with analogies.
9 minPart three of the course: what implied volatility is, why options are expensive before earnings, and how IV crush takes the profit even from someone who got the direction right. Expected move and the two sides of the crush — descriptively.
10 minPart four of the course: what happens on assignment for a covered call and a cash-secured put, what sequence risk is (small gain, big rare loss), early assignment, and what rolling a position means.
11 minThe course finale: a directory of 9 structures by view plus timing — volume levels (POC/VAH/VAL, naked POC), IV rank (when to buy cheap / sell expensive) and an EMA trend filter. Descriptive, not signals.
13 minSee it live: QMA scores 17,000+ stocks for you
Full access to the 5-pillar analysis, smart-money signals, strategies and the whole-market screener. No commitment, cancel anytime.