CoStar Group Inc (CSGP)

Investment Committee Summary

Investment Thesis

At $29.21 (13 October 2026) CoStar trades on roughly 21x forward earnings, a fraction of the information-services peer median and far below its high of the past year. The market is pricing a prolonged commercial-property transaction recession and assigning little value to the recurring data and analytics base beneath it. The engine differs on durability rather than on direction: subscription revenue holds base-case growth at a mid-single-digit rate, and the capex-bridge discounted cash flow, with capital spending normalising as a share of revenue, lands close to where the blend does. The shares are fairly valued against a triangulated fair value of $30.67, a gap of +5%, with the probability-weighted expected value at $29.77 and the twelve-month target set from it at $29.48. An operating margin near 2.2% (reported GAAP, TTM to Jun 2026) and net cash of ~$0.2B describe a business whose recurring base is intact but which has very little balance-sheet slack for a long residential investment cycle. The HOLD rating follows, because the margin of safety is too thin to pay for at this price. The single most damaging risk is structural: brokerage and data disruption carries roughly a fifth of the probability and compresses earnings and the multiple together, to a target below the 52-week low.

Narrative drafted 2026-08-16 by claude-opus-5 under supervision; reviewed by Marinus 2026-08-16.

The dashboard below is the whole argument on one page: spot ($29.21) against each valuation anchor, the scenario tree, technicals and the options-implied move.

Anti-Thesis (The Real Bear Case)

The structural bear carries roughly a fifth of the 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. The reported earnings cover beneath the multiple is thin — the company converts a large revenue base into very little bottom line, so the equity is valued on a promise rather than on a print. If renewal rates slip while transaction volumes stay depressed, an operating margin near 2.2% (reported GAAP, TTM to Jun 2026) compresses hard and the market pays a materially lower multiple on those reduced earnings. That path lands below the 52-week low. Nothing in the chain requires a recession — only continued share loss and spending that fails to convert, and net cash of ~$0.2B means the residential campaign is funded out of operating cash flow rather than out of surplus.

Key Debate

P/E Multiple explains 59% 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.

What the Market Is Pricing In

At the current price, the market pays 21.6× consensus forward EPS, vs the house DCF terminal 19.0×, and a peer median 37.2×. The house DCF sits 13% above spot, so the market is pricing in less than the house case — roughly 1.8pp of revenue CAGR.

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

Scenario Analysis

The scenario tree spans a structural 'Structural — Brokerage / Data Disruption' downside ($13.40) to a 'Bull — Re-Rate' bull case ($53.50); the probability-weighted blend (PWEV $29.77) is +2% versus spot.

SBC charge: scenario targets are gross per-share prices; the PWEV is reduced by one year of stock-based-compensation dilution (1.6% of shares, on SBC ≈ 1% of revenue), trimming the gross PWEV of $30.25 to $29.77 (-1.6%). SBC is charged once, as dilution — never also deducted from FCF.

Scenario rationale — the driver path behind every target:

• Structural — Brokerage / Data Disruption (20%, $13.40). Structural impairment — transaction-volume recession / disruption: earnings AND the multiple compress together. Target sits below the 52-week low by construction.
• Transaction-Volume Recession (17%, $22.60). Cyclical downturn — transaction volumes + leasing / capital-markets activity + data/SaaS subscriptions weakens for 1–2 years before normalising.
• Base — Resilient Recurring + Transactional (35%, $31.40). Mid-cycle — normalised transaction volumes + leasing / capital-markets activity + data/SaaS subscriptions; disciplined capital allocation; steady returns.
• Growth — Capital-Markets Recovery / Data (20%, $42.30). Upside — capital-markets recovery + data growth lifts earnings above mid-cycle; the multiple expands modestly.
• Bull — Re-Rate (8%, $53.50). Upside tail — sustained tight conditions or a structural re-rate on capital-markets recovery + data growth.

Valuation Triangulation

Three weighted anchors — an intrinsic dcf, a scenario-weighted pwev and a monte carlo median (student-t + regime switching) — read them with their basis in mind. The Monte Carlo, the scenario PWEV, any DCF's exit-multiple terminal and any peer re-rate key off a market multiple, so they are not independent; only a DCF's explicit-period cash flows are multiple-free, and its terminal usually carries most of its value. The discipline is to read the spread, not to treat three numbers as three independent votes.

The house blend DECLARES five anchor weights — DCF 35%, scenario PWEV 25%, Monte Carlo 15%, sum-of-parts 15%, peer re-rate 10%. For this name sum-of-parts, peer P/E re-rate are not computed, so 25% of the declared weight is redistributed across the anchors that exist — which is why the weights above differ from the declared ones. The fair value is unaffected by this disclosure; the blend has always worked this way. The company-lever row in the Sensitivity section is an illustrative EBIT × multiple value, not a sum-of-parts anchor.

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.

Monte Carlo — the outcome distribution

10,000 paths, Student-t shocks (fat tails) with a regime-switching overlay. The median lands at $26.86 and 42% of paths finish above spot. The variance decomposition shows the p/e multiple is the dominant swing factor (59% of variance). Value is a multiple bet: fundamentals move the answer far less than the rating does.

DCF — explicit-period cash flows with an exit-multiple terminal

A 5-year cash-flow path discounted at a WACC of 9.0%, plus a terminal value of final-year FCF × 19.0x — a terminal multiple equal to 0.85 × the base multiple that the Monte Carlo and the scenario tree also use → $32.94. The terminal value is 77% of enterprise value, so this anchor moves with the multiple assumption. The heaviest anchor in this blend (47%); because its terminal is a market multiple, it is not independent of the multiple-driven anchors.

Peer benchmarking — relative value

Against the peer cohort, re-rating to the peer-median EV/Revenue multiple implies $76.58; the peer-median forward P/E is 37.2x, but the engine carries no P/E-implied price for this name (fewer than three same-sub-industry peers carry a forward multiple). A premium is only justified by superior growth/margins; otherwise it is multiple risk. Excluded from the weighted blend — shown only as a market cross-check.

Across all anchors the spread is 151% of the median — wide (genuine disagreement — the blend carries low valuation confidence).

Sensitivity

DCF/share — WACC × terminal multiple

DCF/share — revenue CAGR Δ × model op-margin Δ (Δ applied to the DCF's house margin path)

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

Company lever — value at the base multiple vs Real Estate Services multiple (base 18.0x)

Illustrative: segment EBIT × multiple, plus net cash, over basic shares — it does not enter the triangulated fair value.

Peer Quality & Weighting

Quality-weighted forward P/E: 29.3× (simple median 37.2×). Direct peers count 100%, segment 50%, broad 25%.

Historical-range cross-check: 52-week range $25.89–$79.08, centre $45.20 (+55% vs spot); spot sits at the 6th percentile of the range. Low-weight mean-reversion cross-check, not a fundamental anchor.

Risk / Reward & Margin of Safety

Reward/risk = (triangulated FV ÷ price − 1) ÷ (1 − 'Structural — Brokerage / Data Disruption' target ÷ price). 'Structural — Brokerage / Data Disruption' ($13.40, probability 20%) is the lowest-target scenario in the tree, taken gross of SBC dilution. Bull case (Bull — Re-Rate): $53.50.

Company Overview & Business Model

CoStar Group Inc — REAL ESTATE · REAL ESTATE SERVICES. CoStar Group, Inc. provides online market information, analysis and services to the commercial real estate, hospitality, residential and related professional industries in the United States, Canada, Europe, Asia Pacific and Latin America. The company is headquartered in Washington, the District of Columbia.

Company description as supplied by Alpha Vantage; not checked against the company's filings.

How it makes money.

† Model margin = gross margin − the opex ratio calibrated so the Monte Carlo median EPS meets the EPS target; it is not a reported operating margin.

Reported operating margin (GAAP): -2.2% for the fiscal year ended 2025-12-31; 2.2% TTM to 2026-06-30 (Alpha Vantage INCOME_STATEMENT).

Edge. 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.

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.)

For comparison, the company's reported GAAP operating margin was -2.2% for the fiscal year ended 2025-12-31; 2.2% TTM to 2026-06-30 (Alpha Vantage INCOME_STATEMENT).

Named Exposures

Demand & pricing cycle (FACT/ESTIMATE)

Capital intensity & shareholder returns (ESTIMATE)

Structural risk vs optionality (INFERENCE)

Balance Sheet & Liquidity

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

Capital Allocation

Free-Cash-Flow Quality

Accounting quality: SBC 1% of revenue.

Competitive Moat

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

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 (2026Q2): management +0.34 vs analyst floor -0.03 → delta +0.37 (n=28 mgmt / 15 Q&A; 39th pctile across the S&P book, z -0.3).

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

News (last 365d, 1449 articles): avg ticker sentiment +0.12 (bullish 25% / bearish 8%)

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.

Catalyst Calendar

• 2026-10-27 (~15d) — Quarterly earnings — est. EPS $0.28 (AV EARNINGS_CALENDAR)
• 2026-10-27 (~15d) — Homes.com residential monetization / membership-conversion update (authored)
• 2027-02-24 (~135d) — FY2027 guidance with net-new bookings and residential-margin path (authored)

Forecast Track Record

• EPS surprise: beat 100% of the last 8 quarters; average surprise +23.7%.

Catalyst Timeline

6 catalysts in the next 90 days (of 14 tracked). Importance 1–3; confidence 0–1.

_Sources: extended.catalysts, data/catalysts/.json, data/catalysts/macro.json, AV DIVIDENDS, opex 3rd-Friday calc.

Regulatory & Legal Risk

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

Scenario Macro & Key Risks

Scenario-macro rows withheld pending re-authoring: 2 carrying another cluster's vocabulary or a frozen figure — recorded in the narrative quarantine ledger.

Decision Rules (Machine-Checked)

Stance: Hold — 0 bullish / 1 bearish / 1 caution rules triggered of 5 evaluable (1 lacked data).

Machine-checked rules over disclosed inputs. The authored falsification triggers elsewhere in this report are analyst judgment and are NOT evaluated here. The stance is what the model's own rules read on this name; it does not modify the published research rating, and it is not personal financial advice.

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). (rationale withheld pending re-authoring — frozen figure or verdict)
• Non-GAAP operating margin < 25.5% (2 consecutive prints). (rationale withheld pending re-authoring — frozen figure or verdict)
• Annual subscription renewal rate < 88% (2 consecutive prints). 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). 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). (rationale withheld pending re-authoring — frozen figure or verdict)

Fact / Inference / Speculation

• FACT: Spot $29.21; 52-week range $25.89–$79.08; engine rating HOLD; house target $29.48 (+1%). (source: Alpha Vantage 2026-10-12, 13 October 2026)
• INFERENCE: Triangulated FV $30.67 (+5% vs spot · triangulated FV); the rating tracks the Monte-Carlo + scenario-PWEV core; the DCF 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.

Conviction Score

Research Conviction measures the strength and quality of the research setup — input coverage, financial quality, valuation support, process agreement. It is NOT the probability that the recommendation succeeds; the forecast track record section is the evidence on that.

63.0/100 (confidence band 49.2–76.8), 70th percentile of 928 covered names (as of 2026-10-12). Weighted composite under config ros-1.21.0 — every component and its inputs below.

Missing inputs (macro tailwinds) are excluded and the remaining weights renormalised; the confidence band widens accordingly.

Score history: 64.4 → 64.3 → 63.8 → 62.8 → 63.3 → 62.6 → 62.7 → 62.7.

Probability-Weighted Return Profile

Horizon: 1 year — at this horizon CAGR equals total return by definition. Expected values are the probability-weighted sums over the full scenario set below.

The gross expected return is the probability-weighted scenario return (it reconciles to the gross PWEV); the diluted figure applies the SBC share-count charge and matches the published PWEV-based target.

Expected Alpha

Expected return minus the return this name is REQUIRED to deliver for its risk (1-year horizon). Constants are pre-registered (preregistered-static (amendment #2, 2026-07-29); not fitted to MCH outcomes).

A negative expected alpha does not change the rating — it says the expected return does not clear the risk-adjusted hurdle at today's price. Rating mechanics are unchanged by this section.

Probability Cross-Checks

Not authoritative. The scenario probabilities in this report are AUTHORED — a judgement about how the world might go, not a measurement. Nothing below modifies them, the target, the rating or any position size. These checks ask only whether anything outside our own model agrees with us; where it does not, that is information for the reader, not a correction we have quietly applied.

Authored set: 5 scenarios, probabilities summing to 1.0, mean target $30.25.

Flagged for review: internal coherence (authored mass vs Monte Carlo). A flag marks a disagreement worth understanding — it does not imply either side is wrong.

Factor Exposures

Cross-sectional percentiles over 928 covered names (style scores sector-demeaned; thematic = return-beta to the theme's proxy ETF). 50 = estate median.

Market interaction: correlation vs SPY +0.31, vs QQQ +0.20 (trailing ~1y daily returns).

Rating Bridge

Rating = HOLD because:

• Probability-weighted scenario value implies +2% vs spot
• Monte Carlo median implies -8% vs spot
• DCF fair value (exit-multiple terminal) implies +13% vs spot
• Bear case (Structural — Brokerage / Data Disruption) downside is -54% vs spot
• Net: reward/risk of 0.1× is not asymmetric enough for a Buy and not impaired enough for a Sell — hence Hold.

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) $3B + PV(terminal) $10B = EV $13B; + net cash $0.2B → equity $14B ÷ diluted shares $0.41B = $32.94/share (exit-multiple terminal).

• Gordon terminal → $28.66/share — a single-point perpetual-growth cross-check at g = 2.5% (one growth rate, not a range; it is not in the blend).
• Incremental ROIC on the forecast capex ≈ 17% vs WACC 9.0% → above WACC — the build is value-creative.

Peer set

Implied prices at the peer medians: EV/Rev → $76.58 (no P/E-implied price — fewer than three same-sub-industry peers carry a forward multiple).

Weighted fair-value math

Assumption Register

Sensitivity-ranked drivers (widest fair-value swing first): Terminal × ±15% (8.0); Model op margin ±3pp (8.0); Revenue CAGR ±3pp (7.0); WACC ±1pp (3.0); Capex intensity ±15% (2.0).

Inputs, Sources & Confidence

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

Research Provenance

Load-Bearing Assumptions

DCF: WACC 9.0%, terminal multiple 19×, FY+5 revenue $4B. Triangulation leans 47% on DCF, 33% on PWEV, 20% on the Monte Carlo median.