Trading in options tied to CoStar Group Inc. (NASDAQ: CSGP) increased notably by early Thursday afternoon, with exchange data showing a total of 3,991 contracts traded by 1:50 p.m. New York time.
Put options constituted the overwhelming share of that activity, with 3,566 contracts exchanged, while call options numbered 425. The concentration of volume was especially pronounced at a single strike: the June 18, 2026 $30 put accounted for 3,252 contracts of the day's trades. Open interest for that contract was recorded at 802 contracts as of the previous trading day, Wednesday.
During the same session, CoStar Group's common stock declined 3.81% to close at $32.93. Market-based measures tied to the firm's options showed minor shifts: three-month volatility moved down by 0.11 percentage points to 56.87%, while the three-month 90/110 skew increased by 0.53 percentage points to 3.05 percentage points.
Context and market signals
The intraday breakdown of option types and the concentration at a single, near-term put strike are the clearest data points available from the trading session. The aggregate volume total, the put-to-call split, and the specific strike with unusually high turnover are the principal observable facts for market participants assessing the flow into CSGP options for the period reported.
Data points reported
- Total options traded by 1:50 p.m. New York time: 3,991 contracts.
- Put options: 3,566 contracts; call options: 425 contracts.
- June 18, 2026 $30 put volume: 3,252 contracts; open interest as of Wednesday: 802 contracts.
- CoStar Group share price change during session: -3.81%, to $32.93.
- Three-month volatility: down 0.11 percentage points to 56.87%.
- Three-month 90/110 skew: up 0.53 percentage points to 3.05 percentage points.
What the public data shows and what it does not
The exchange figures provide a snapshot of trading flow and options pricing metrics for the session in question. They document the number of contracts traded, the distribution between put and call activity, the concentration at a particular strike and the contemporaneous movements in the underlying share price and select volatility measures. The available information does not include the identities or motivations of market participants behind those trades, nor does it provide forward-looking statements about future price action beyond the recorded metrics.