CoStar Group (CSGP) Options Chain
NASDAQ: CSGPFinanceReal EstateUSD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Expiration date
- Expiration
- Nov 20, 2026
- Days to expiration
- 40
- Share price
- $29.67
- Put/call ratio (OI)
- 0.86
- Put/call ratio (volume)
- 0.62
- Expected move
- ±$5.97
- Open interest (C / P)
- 778 / 667
CSGP options summary
The CSGP options chain for the November 20, 2026 expiration lists 5 call and 5 put contracts, with 40 days until expiration. Open interest stands at 778 calls and 667 puts, a put/call ratio of 0.86, which is fairly balanced between calls and puts. At-the-money implied volatility near the $30.00 strike is 60.8%, which implies the market expects a move of about ±$5.97 (20.1%) in CoStar Group stock by expiration.
The most open interest sits at the $30.00 call (426 contracts) and the $25.00 put (415 contracts).
Summary generated from market data by MetaCap's automated system. Methodology
CSGP options chain · November 20, 2026
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| — | — | — | 20.00 | 0.00 | 0.40 | 0.24 | |||||
| — | — | — | 22.50 | 0.20 | 0.45 | 0.25 | |||||
| 3.20 | 5.10 | 6.00 | 25.00 | 0.40 | 0.90 | 0.61 | |||||
| 2.30 | 2.15 | 2.55 | 30.00 | 2.35 | 2.65 | 2.55 | |||||
| 0.81 | 0.75 | 1.00 | 35.00 | 5.90 | 6.20 | 8.07 | |||||
| 0.31 | 0.20 | 0.35 | 40.00 | — | — | — | |||||
| 0.15 | 0.00 | 0.55 | 45.00 | — | — | — | |||||
In-the-money callsIn-the-money puts. IV = implied volatility, OI = open interest (contracts). Each contract covers 100 shares. Quotes delayed at least 15 minutes.
Frequently asked questions
What is the CSGP put/call ratio?
For the November 20, 2026 expiration, the CSGP put/call ratio based on open interest is 0.86 (667 puts vs 778 calls), and 0.62 based on today's volume. A ratio above 1 means more puts than calls.
What is CSGP's implied volatility?
At-the-money implied volatility for CSGP options expiring November 20, 2026 is about 60.8%, an annualized estimate of how much the market expects CoStar Group stock to move.
How many CSGP option expiration dates are there?
CSGP has 10 listed expiration dates, from Oct 16, 2026 to Jan 19, 2029.
What does "in the money" mean?
A call is in the money when the strike price is below the current share price; a put is in the money when the strike is above it. In-the-money contracts have intrinsic value and are shaded in the table.