CoStar Group (CSGP) options flow
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Options flow session · Last trade
The optional price chart loads separately. Recorded options trades are available below.
Session chart data
| Strike (USD) | Net GEX per 1% move (USD) |
|---|---|
| $20 | -$13,842 |
| $25 | -$386,296 |
| $30 | -$144,883 |
| $35 | $206,169 |
| $40 | $158,239 |
| $45 | $231,998 |
| $50 | $38,992 |
| $55 | $30,749 |
| $60 | $38,457 |
| $70 | $17,220 |
| $75 | $47,015 |
| $85 | $26,553 |
CSGP session snapshot
Bullflow recorded 7 CSGP options trades on Tuesday, October 27, 2026, totaling $865,259 in premium. Calls made up $656.73K (75.9%) across 3 trades and puts $208.53K (24.1%) across 4 trades, a put/call premium ratio of 0.32.
6 trades were sweeps and 1 were blocks. 2 filled at or above the ask, 5 at or below the bid and 0 at the mid. The largest was a $246,693 sweep of 121 Jan 19, 2029 $15 Call trade at 11:34:56 ET, filled at the ask.
CSGP closed at $32.01, down 5.01% from the prior close. Net gamma exposure was $263.19K per 1% move at the Oct 27, 2026, 15:59:21 ET snapshot; the largest positive GEX strike was $45.
- Company
- CoStar Group Inc
- Exchange
- NASDAQ
- Sector
- Unavailable
- Close
- $32.01
CSGP options flow statistics
- Total premium
- $865.26K
- Recorded trades
- 7
- Call premium
- $656.73K
- Put premium
- $208.53K
- Put/call premium ratio
- 0.32
- Avg premium per trade
- $123.61K
- Calls / puts (trades)
- 3 / 4
- Sweeps / blocks
- 6 / 1
- At or above ask
- 2
- At or below bid
- 5
- Largest trade
- $246.69K
- Last trade
Where the premium went
in calls
$865.26K · 7 trades
Premium
Trade type
Fill side
CSGP largest options trades
| Time | Contract | C/P | Premium | Size | Fill | Type |
|---|---|---|---|---|---|---|
| CSGP Jan 19, 2029 $15 | Call | $246,693 | 121 | Ask | Sweep | |
| CSGP Jan 19, 2029 $15 | Call | $224,601 | 110 | Below Bid | Sweep | |
| CSGP Jan 19, 2029 $15 | Call | $185,440 | 91 | Below Bid | Sweep | |
| CSGP Jan 15, 2027 $30 | Put | $92,150 | 485 | Ask | Sweep | |
| CSGP Apr 16, 2027 $35 | Put | $91,200 | 160 | Bid | Sweep | |
| CSGP Nov 20, 2026 $30 | Put | $12,995 | 113 | Bid | Block | |
| CSGP Nov 20, 2026 $30 | Put | $12,180 | 116 | Bid | Sweep |
3 of the 7 largest trades, $656.73K combined
The 7 largest trades total $865.26K of $865.26K
CSGP gamma exposure
- Spot at snapshot
- $31.97
- Net GEX per 1% move
- $263.19K
- Largest positive strike
- $45
- Largest negative strike
- $25
Closing snapshot , 29 strikes across 9 expirations (Unavailable to Unavailable).
CSGP options flow questions
What was the largest CSGP options trade on October 27, 2026?
A $246,693 sweep of 121 CSGP Jan 19, 2029 $15 Call trade at 11:34:56 ET, filled at the ask. It was the largest of 7 trades Bullflow recorded for CSGP that session.
How much CSGP options premium traded on October 27, 2026?
$865,259 across 7 recorded sweeps and blocks: $656,734 in calls (3 trades) and $208,525 in puts (4 trades).
Was CSGP options flow bullish or bearish on October 27, 2026?
Calls were 75.9% of premium (put/call premium ratio 0.32). 5 of 7 trades filled at or below the bid and 2 at or above the ask. Premium and fill side do not show whether a trade opened or closed a position or was a hedge, so they do not establish direction on their own.
What are CSGP's gamma exposure levels?
At the Oct 27, 2026 closing snapshot (15:59:21 ET, spot $31.97), CSGP net GEX was $263.19K per 1% move. The largest positive GEX strike was $45. The largest negative GEX strike was $25. The snapshot covers 29 strikes and 9 expirations.
How often is CSGP options flow data updated?
The page shows a completed session (October 27, 2026, last trade 15:20:52 ET) and updates after the next trading day becomes historical. Intraday CSGP flow is in the Bullflow dashboard and API.
How to read this data
This summary covers recorded single-leg sweeps and blocks with positive premium, excluding cancelled trades. It describes the covered flow, not all options-market volume. Total premium is gross traded premium; it is not net buying pressure. The interactive dashboard can use different filters and may show different totals.
Calls, puts, and execution near the bid or ask provide context but do not establish whether a position was opened or closed, whether it was part of a hedge, or where the stock will move next. The session updates after the next trading day becomes historical.
Stock prices show regular-session candles delayed at least 15 minutes. The latest view refreshes during market hours; the flow-session view places recorded trades on their original date, using interpolated stock prices between candle samples. Gamma exposure shows its separately dated public closing snapshot.