CSGPCoStar Group Inc
Options Analysis Report•SERVICES-BUSINESS SERVICES, NEC
Market Cap $16.7B|NASDAQ
● 2026-04-17$39.72
BULLISH
Analysis: 2026-04-16 EOD data
1Y -49.0%YTD -39.5%7D +8.9%
Options Vol
4,012
30D
Implied Move
±18.3%
IV Rank
81%
CSGP Options Overview
IV is elevated with bullish flow. Conditions favor premium sellers.
REWARDS
RISK ANALYSIS
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Value
Is IV priced right?
2.5
ExpensiveCheap
Measures whether options are cheap, fair, or rich relative to historical and peer
IV
levels.Risk Checks3/9 checks passed
IV Rank
≤35%IV Rank 86.2% — elevated vs history
IV/HV Ratio
<1.05xIV/HV 1.36x — IV premium over HV
Sector Relative≤50%
Sector percentile 96% — above sector median
Term Structure
<1.1xFront/Back 1.19x — backwardation
Skew Normal
<1.25xPut/Call IV 1.16x — elevated
Absolute IV
<80%ATM IV 53.3% — normal range
Spread-Adjusted Value
<80%Effective IV 84.0% (ATM 53.3% + spread 15.3% + bias) — expensive
Execution Efficiency
<3.0%Total drag 22.80% (spread 15.33% + slippage 7.47%) — high friction
Vega Efficiency
≥5.0Vega efficiency 5.15 (vega 7.901 / spread 15.33%) — acceptable
Sentiment
Bullish or bearish?
5.7
BearishBullish
Analyzes
put/call ratios
, open interest skew
, and flow direction to determine market bias.Risk ChecksBearish - Strong signal (Conviction: -22%, Raw: -13%)
Flow Direction
|net sentiment| ≥25%Conviction-weighted: -22% (bearish) — Raw: -13%
OI Skew Magnitude
≥15%|OI skew| 63.2% — call-heavy
Volume-OI Alignment
Same sign, |vol skew| ≥10%Vol skew +30.8%, OI skew +63.2% — aligned
Conviction Quality
≥2/3 conditions0-DTE 90%, far-OTM 15%, avg DTE 30
OI Momentum
|change| ≥3%OI change +0.0% (5d) — stable
Smart Money Flow
|weighted flow| ≥20%ITM: -88%, ATM: +29%, OTM: +0% — strong bearish (ITM/ATM divergent)
Sector Relative≤40% or ≥60%
Sector P/C percentile 37% — bullish vs sector
Activity
Unusual activity?
5.0
QuietActive
Detects volume surges,
block trades
, and unusual options activity that may signal moves.Risk Checks2/9 checks passed
Volume Surge
≥1.5xVolume 1.3x avg — normal
Turnover Rate
≥15%Vol/OI 6.2% — normal turnover
Strike Concentration
≥60%Top 3 strikes = 50% — dispersed
Multi-Day Persistence
≥2 days1 day(s) elevated — may be one-day event
OI Build
≥5%OI change -5.2% (5d) — unwinding
Sector Relative≥60%
Sector activity percentile 90% — very active vs sector
Trade Quality
≥30%Large trade volume 44% — institutional presence
Execution Urgency
≥60%Aggressive execution 50% — patient
Flow Conviction
≥30Conviction -22 (bearish) — mixed
Liquidity
Can I trade efficiently?
3.1
IlliquidLiquid
Evaluates
bid-ask spreads
, volume depth, and open interest for trade execution quality.Risk Checks3/8 checks passed
Tradeable Spread
≤5.0%Spread 15.3% — wide
Adequate OI
≥10,000OI 64,584 — deep
Active Volume
≥500Volume 4,012/day — adequate
Reasonable Cost
≤$0.50$0.77 to cross — expensive
Strike Coverage
≥5 strikes0 liquid strikes — limited options
Sector Relative≤40%
Sector spread percentile 97% — much wider than sector
Order Book Depth
≥100 contractsDepth 375.3 contracts (bid:215.4 ask:159.9) — adequate
Execution Quality
<1.0%Avg slippage 7.47% — poor
Timing
Is now a good time?
7.8
RiskyFavorable
Considers earnings proximity,
time decay
, and event calendar for optimal entry timing.Risk Checks7/9 checks passed
Term Structure Clarity
|slope| ≥5%Slope +19.1% — backwardation
IV Percentile Clarity
<30 or >70IV percentile 86% — seller opportunity
Event Detection
≥10pts kinkIV kink 9.7pts — no clear event
Theta/Vega Clarity
<0.5 or >2.0θ/ν ratio 319.88 — favors income trades
Expiration Distribution
≥3 expirations3 liquid expirations — flexible
Event Risk
≥60% (safe)acceptable: Earnings in 11d
Spread Momentum
<1.2 ratioSpread ratio 1.00x — stable
Flow Momentum
≥25% strength + ≥50% consistencyFlow -22% @ 61% consistency — unclear
Smart Money Timing
≥40 composite scoreScore 74 (ITM 20% + inst 44%) — HIGH institutional
Directional Strategy Fit
Option Buyers
Long Calls4.5
bullishIV expensive, mixed flow
Long Puts4.0
bearishIV expensive, mixed flow
Premium Sellers
Cash-Secured Put6.4
bullishIV rich premium, mixed flow
Covered Call5.6
bearishIV rich premium, mixed flow
For educational purposes only. Not investment advice.