CoStar Group Inc (CSGP)

Rating: HOLD

HOLD (5-tier) · quality defensive · conviction: medium

EPS basis for the forward P/E and all scenario multiples: consensus forward EPS (broker-adjusted, non-GAAP).

Methodology: Valuation triangulated across five independent anchors — Monte Carlo (Student-t + regime switching), an independent DCF, peer re-rating, a sum-of-parts, and a scenario-weighted PWEV. Figures reconciled to Alpha Vantage 2026-06-27. Each chart below sits with the part of the thesis it evidences.

General research for a skeptical institutional reader. Not personalised investment advice; no position sizing or trade instructions. Figures as of the analysis date; verify before acting.

Investment Committee Summary

📎 Download the full model (Excel) — DCF line items, scenarios, sensitivity, assumptions, and extended fundamentals.

Rating Bridge

Rating = HOLD because:

• Probability-weighted scenario value implies +1% vs spot
• Monte Carlo median implies -9% vs spot
• DCF fair value implies +11% vs spot
• Bear case (Structural — Brokerage / Data Disruption) downside is -55% vs spot
• Net: reward/risk of 0.1× is not asymmetric enough for a Buy and not impaired enough for a Sell — hence Hold.

Investment Thesis

At 28.32 (Alpha Vantage, 27 June 2026) CSGP trades below its 52-week low of 28.54 and roughly 71% under the 97.43 high, on a forward P/E near 16.9x against a peer-median 37x. The market is pricing a prolonged commercial transaction-volume recession and assigning little value to the recurring data and analytics base. The engine differs on durability, not direction: subscriptions hold base-case growth at 6% on $3.4B of TTM revenue, the DCF anchors at 29.78 with capex normalising toward 3% of revenue from the $0.389B FY2025 actual, and the scenario grid sets a 31.38 base against a 13.31 structural bear. The probability-weighted target of 30.24 sits about 7% above spot, and Monte Carlo gives only a 45.9% chance of finishing above the current price — the rating is HOLD, not BUY, because the margin of safety is too thin to pay for. The most damaging risk is structural: brokerage and data disruption carries a 20% weight and compresses earnings and the multiple together.

The dashboard below is the whole argument on one page: spot ($30) against each valuation anchor, the scenario tree, technicals and the options-implied move.

Anti-Thesis (The Real Bear Case)

The structural bear carries a 20% weight and its mechanism is credible. CoStar's proprietary-data moat is under attack from two directions: AI-native aggregation erodes the pricing power of commercial listings data, while the residential push burns cash against Zillow's entrenched network effects with no assured payback. FY2025 GAAP net income was $7M (Alpha Vantage) — the earnings cover beneath the multiple is thin. If renewal rates slip below the high-80s while transaction volumes stay depressed, the margin compresses toward 19.5% and the market pays 11x, not 17x. That path lands at 13.31, below the 52-week low, a drawdown of roughly 53% from 28.32. Nothing in that chain requires a recession — only continued share loss and spending that fails to convert.

Key Debate

P/E Multiple explains 66% of Monte Carlo outcome variance — i.e. value is set by the multiple the market will pay, a rate/sentiment regime bet as much as an earnings bet.

Earnings-Call Disconfirmation & Sentiment

Derived signals from the MCH market-data store (Alpha Vantage transcripts + news). Quantitative tone only — a disconfirmation flag, not a substitute for reading the call.

Management vs analyst tone (2026Q1): management +0.37 vs analyst floor +0.01 → delta +0.36 (n=19 mgmt / 10 Q&A; 44th pctile across the S&P book, z -0.2).

Flag: TYPICAL — management-vs-analyst tone within the normal cross-sectional range.

News (last 365d, 1000 articles): avg ticker sentiment +0.10 (bullish 22% / bearish 9%)

Scenario Analysis

The tree runs from a structural 'Structural — Brokerage / Data Disruption' downside ($13) to a 'Bull — Re-Rate' bull case ($54); the probability-weighted blend (PWEV $30) is +1% versus spot.

Scenario rationale — what each probability buys (the driver path behind every target):

• Structural — Brokerage / Data Disruption (20%, $13). Structural impairment — transaction-volume recession / disruption: earnings AND the multiple compress together. Target sits below the 52-week low by construction. Drivers — implied_target: 13.31; probability: 0.2.
• Transaction-Volume Recession (17%, $23). Cyclical downturn — transaction volumes + leasing / capital-markets activity + data/SaaS subscriptions weakens for 1–2 years before normalising. Drivers — implied_target: 22.6; probability: 0.17.
• Base — Resilient Recurring + Transactional (35%, $31). Mid-cycle — normalised transaction volumes + leasing / capital-markets activity + data/SaaS subscriptions; disciplined capital allocation; steady returns. Drivers — implied_target: 31.38; probability: 0.35.
• Growth — Capital-Markets Recovery / Data (20%, $42). Upside — capital-markets recovery + data growth lifts earnings above mid-cycle; the multiple expands modestly. Drivers — implied_target: 42.37; probability: 0.2.
• Bull — Re-Rate (8%, $54). Upside tail — sustained tight conditions or a structural re-rate on capital-markets recovery + data growth. Drivers — implied_target: 53.51; probability: 0.08.

Valuation Triangulation

Five anchors — but read them with their basis in mind. The Monte Carlo, the DCF terminal, and the peer re-rate all key off a market multiple, so they are not fully independent; only the discounted cash flows themselves are genuinely multiple-free. The discipline is to read the spread and weight the cash-based view, not to treat five numbers as five independent votes.

Peer EV/Revenue re-rate — 0% weight: it duplicates the peer-multiple information already carried by the Peer P/E anchor while ignoring margin mix; weighting both would double-count the peer view. Shown as a cross-check.

peer P/E re-rate excluded from the weighted blend — diverges >55% from the Monte-Carlo / scenario core. For a high-leverage equity the per-share DCF (enterprise value less large net debt) is hypersensitive to the terminal multiple; a peer re-rate across heterogeneous margins is apples-to-oranges. Shown above for reference; the blend leans on the multiple-discipline and scenario anchors.

Monte Carlo — the distribution, not a point

10,000 paths, Student-t shocks (fat tails) with a regime-switching overlay. The median lands at $27 and 40% of paths finish above spot. The variance decomposition shows the p/e multiple is the dominant swing factor (66% of variance). Value is a multiple bet: fundamentals move the answer far less than the rating does.

DCF — the cash-flow anchor

Independent of the market multiple: a 5-year path, WACC 9.0%, 15x terminal FCF multiple → $33. This anchor is deliberately the heaviest (41%): it is the valuation least hostage to the current multiple regime.

Peer benchmarking — relative value

Against the peer cohort, re-rating to the peer-median forward multiple (P/E 37.239999999999995x) implies $63. A premium is only justified by superior growth/margins; otherwise it is multiple risk. Weighted just 12% so the market's mood does not drive the fair value.

Across all anchors the spread is 149% of the median — wide (genuine disagreement — the blend carries low valuation confidence).

Revenue-Segment Breakdown

The company-specific drivers behind the valuation — each segment carries its own growth, margin, multiple and capex intensity. (Tags: FACT reported · ESTIMATE from disclosures · INFERENCE judgment.)

Named Exposures

Demand & pricing cycle (FACT/ESTIMATE)

Capital intensity & shareholder returns (ESTIMATE)

Structural risk vs optionality (INFERENCE)

Industry Context — Real Estate

This name sits in the Real Estate as a real_estate_services. transaction volumes + leasing / capital-markets activity + data/SaaS subscriptions Its scenarios are not guessed in isolation — they inherit a single, shared view of the cluster's driver cycle, so the names that depend on the same event are mutually consistent.

Value chain: WELL (reit_core) · PLD (reit_growth) · EQIX (reit_growth) · SPG (reit_core) · AMT (reit_growth) · DLR (reit_growth) · O (reit_core) · PSA (reit_core) · VTR (reit_core) · CBRE (real_estate_services) · IRM (reit_cyclical) · CCI (reit_growth) · EXR (reit_core) · VICI (reit_core) · AVB (reit_core) · EQR (reit_core) · SBAC (reit_growth) · ESS (reit_core) · WY (reit_cyclical) · INVH (reit_core) · HST (reit_cyclical) · MAA (reit_core) · REG (reit_core) · DOC (reit_core) · UDR (reit_core) · CSGP (real_estate_services) · BXP (reit_cyclical) · CPT (reit_core) · FRT (reit_core) · ARE (reit_cyclical)

Mapping note: name-level 'Structural — Brokerage / Data Disruption' (20%) + 'Transaction-Volume Recession' (17%) map to cluster Rate Shock / Oversupply / Demand Loss (37%); name-level 'Growth — Capital-Markets Recovery / Data' (20%) + 'Bull — Re-Rate' (8%) map to cluster Upside — NOI Growth / Cap-Rate Compression (28%) — the cluster row is the SUM of the mapped scenario probabilities, not a different estimate.

On the cluster's key downside — Rate Shock / Oversupply / Demand Loss () — this name implies 37% vs the cluster house view of 37% (in line with the house). The cluster's full cross-stock reconciliation governs that the names which ride the same capex cycle assign it comparable odds.

Structure: Shared State — The real_estate cycle is the shared macro driver. Driver — same-store NOI + occupancy + FFO growth + cap rates / interest rates + property demand Dispersion — Members differ by cyclicality (quality compounders vs deep cyclicals).

Model Appendix

DCF — line items

FCF is bridged: NOPAT + D&A − Capex − ΔNWC (capex intensity 3% of revenue, weighted from the segments) — not a single conversion fudge.

WACC 9.0% · Σ PV(FCF) $4B + PV(terminal) $10B = EV $13B; + net cash → equity $14B ÷ diluted shares 0.41B = $33/share (exit-multiple terminal).

• Gordon (perpetuity-growth) terminal at 2.5% → $35/share — a genuinely non-multiple, cash-based cross-check; the exit-multiple and Gordon values bracket the terminal-value risk.
• Incremental ROIC on the forecast capex ≈ 21% vs WACC 9% → above WACC — the build is value-creative.

Peer set

Peer-median fwd P/E → $63; EV/Rev → $77.

Weighted fair-value math

Sensitivity

DCF/share — WACC × terminal multiple

DCF/share — revenue CAGR Δ × op-margin Δ

Tornado — DCF/share swing by driver (widest first)

Company lever — SoP/share vs Real Estate Services multiple (AI re-rating) (base 18x)

Consensus & Market Expectations

_Consensus figures: Alpha Vantage sell-side aggregates. Where the house view sits materially above or below the street, the divergence is itself a datum — see the thesis.

Balance Sheet & Liquidity

Balance-sheet data as of 2025-12-31 (Alpha Vantage).

Capital Allocation

Free-Cash-Flow Quality

Accounting quality: SBC 5.7% of revenue; cash conversion (OCF/NI) 6143% — cash-backed.

Catalyst Calendar

• 2026-07-28 (~20d) — Quarterly earnings — est. EPS $0.21 (AV EARNINGS_CALENDAR)
• 2026-09-30 (~84d) — Commercial transaction-volume inflection read (rates-driven CRE activity) (authored)
• 2026-10-27 (~111d) — Homes.com residential monetization / membership-conversion update (authored)
• 2027-02-24 (~231d) — FY2027 guidance with net-new bookings and residential-margin path (authored)

Forecast Track Record

• EPS surprise: beat 100.0% of the last 8 quarters; average surprise +29.7%.

Competitive Moat

Wide moat. CoStar's moat is a proprietary commercial-real-estate dataset built over decades with field-researched depth that competitors cannot replicate quickly, plus subscription switching costs. FALSIFIABLE: if renewal rates slip below the high-80s while AI-native aggregation commoditises listings data, the data moat is eroding and the terminal multiple should compress from the high-20s toward the market ~16x. The residential (Homes.com) push is a separate, unproven bet with no assured payback.

Moat sources:

• Proprietary field-researched CRE dataset (CoStar Suite) with decades of depth and coverage (replication barrier)
• Subscription switching costs across brokers, lenders, investors (workflow embeddedness)
• LoopNet/Apartments.com marketplace network effects in listings
• UNPROVEN: residential Homes.com network vs Zillow's entrenched effects - a cash-burning bet, not a moat yet

Regulatory & Legal Risk

Probabilities and sensitivities are analyst estimates, not market-implied.

Scenario Macro & Key Risks

What the Market Is Pricing In

At the current price, the market pays 16.6× forward EPS, vs the house DCF terminal 15.0×, and a peer median 37.239999999999995×. The house DCF sits 11% above spot, so the market is pricing in less than the house case — roughly 1.4pp of revenue CAGR.

Variant perception: the house view is below-consensus, and the thesis is primarily event-driven.

Peer Quality & Weighting

Quality-weighted forward P/E: 29.0× (simple median 37.239999999999995×). Direct peers count 100%, segment 50%, broad 25%.

Historical-range cross-check: 52-week range $29–$97, centre $53 (+76% vs spot); spot sits at the 2th percentile of the range. Low-weight mean-reversion cross-check, not a fundamental anchor.

Risk / Reward & Margin of Safety

Reward/risk compares triangulated upside against the probability-weighted bear target, not the extreme tail. Bull case (Bull — Re-Rate): $54.

Assumption Register

Sensitivity-ranked drivers (widest fair-value swing first): Revenue CAGR ±3pp (8.0); Terminal × ±15% (7.0); Op margin ±3pp (7.0); WACC ±1pp (3.0); Capex intensity ±15% (1.0).

Inputs, Sources & Confidence

Every load-bearing input, labelled by type and confidence. (reported fact · company guidance · consensus estimate · market data · house estimate · inference.)

Source Log

Citation coverage: 13/14 mandated claims sourced. Filing URLs are not available via the market-data provider; company statements are cited as 10-K/10-Q via Alpha Vantage.

Load-Bearing Assumptions

DCF: WACC 9%, terminal multiple 15×, FY+5 revenue $4B. Triangulation leans 41% on DCF, 29% on PWEV.

Reasons the Thesis Could Fail (Falsifiable)

Pre-registered signals that would break the thesis — each polices a specific scenario boundary and is checked at every earnings update:

• Total revenue growth YoY < 2% (2 consecutive prints → Rate Shock / Oversupply / Demand Loss). Midpoint of the base scenario's 6% growth and the transaction-volume-recession scenario's -2%. Two prints below it shift weight from the 31.38 base toward the 22.60 bear.
• Non-GAAP operating margin < 25.5% (2 consecutive prints → Rate Shock / Oversupply / Demand Loss). Midpoint of the base scenario's 26.3% margin and the recession scenario's 24.8%. Sustained prints below it indicate residential spend is outrunning the commercial data profit pool.
• Annual subscription renewal rate < 88% (2 consecutive prints → Rate Shock / Oversupply / Demand Loss). The recurring data/SaaS base separates the base case from structural disruption. Renewal slippage below the high-80s validates the brokerage/data-disruption mechanism behind the 13.31 structural target.
• US commercial property transaction volumes YoY < -10% (2 consecutive prints → Rate Shock / Oversupply / Demand Loss). Marketplace and capital-markets-linked revenue follows deal flow. Two consecutive double-digit volume declines mark the cyclical bear scenario as live rather than residual.
• Annualised capital expenditure > $0.45B (2 consecutive prints → Mid-Cycle — FFO Growth + Stable Cap Rates). The DCF assumes capex declines from the FY2025 $0.389B actual toward ~3% of revenue. A re-ramp above $0.45B annualised delays the FCF normalisation the 29.78 DCF anchor requires.

Fact / Inference / Speculation

• FACT: Spot $30; 52-week range $29–$97; engine rating HOLD; base-case target $30 (+1%). (source: Alpha Vantage 2026-06-27, 8 July 2026)
• INFERENCE: Triangulated FV $31 (+4% vs spot · triangulated FV); the rating tracks the Monte-Carlo + scenario-PWEV core; the cash-flow anchor sits above the multiple-discipline core.
• SPECULATION: At current prices the embedded bet is that the market keeps paying the current multiple through the capex cycle — a regime call the engine cannot verify from fundamentals alone.

Recommendation: HOLD

Balanced: triangulated fair value $35 (+16% vs spot); the outcome hinges on P/E Multiple. The debate is P/E Multiple — fundamentally a multiple/regime call.

Disclosures & Limitations

This report is for informational and research purposes only. It is not personalised investment advice and does not consider any investor's objectives, financial situation, risk tolerance, tax position, or liquidity needs.

• No suitability assessment has been performed for any individual.
• Market data may be delayed or inaccurate; figures are as of the analysis date.
• Model outputs (fair values, targets, scenario probabilities) are estimates and may be wrong.
• Forecasts are uncertain; past performance is not indicative of future returns.
• The author or publisher may hold positions in securities mentioned.
• Users should verify information against primary sources (company filings) before acting.
• Investing involves risk of loss; there is no guarantee any target price is achieved.
• Ratings follow a defined research methodology (12-month expected-return thresholds), not individual circumstances.