CoStar Group CSGP
Real Estate · Real Estate - Services · Synthos Deep Dive · 2026-07-03
The Overview
CoStar is the company that runs the giant databases and websites the real-estate industry pays to use — CoStar (data on office/warehouse/retail buildings), Apartments.com (renting), LoopNet (commercial listings), and now Homes.com (buying a house). The core data business is a cash machine that everybody in commercial real estate has to subscribe to.
So why is the stock down almost two-thirds in a year? Because the boss made a huge, on-purpose bet: he poured over a billion dollars a year of marketing into Homes.com to try to dethrone Zillow. That spending crushed the company's official profit to almost nothing, investors panicked, and the stock fell from about $97 to $30.
Here's the twist: the underlying business kept growing (60 straight quarters of double-digit sales growth), and management is now guiding profit to roughly double as the ad spending gets more disciplined. The stock is cheap if you look at adjusted profit (about 17× next year's earnings) instead of the wrecked official number.
Our verdict is Buy — Tactical: a good business on sale, but sized small because the turnaround has to actually show up.
Here's what our three scores mean in everyday terms:
- Downside Risk 5/10 (middle). The balance sheet is safe (more cash than debt) and the stock isn't jumpy — but it's already crashed once, and if the Homes.com bet keeps bleeding, it could fall further.
- Growth Quality 7/10 (good). Sales grow reliably and the core data business is extremely sticky — but right now it earns almost no official profit, which holds the score back.
- Exponential Potential 6/10 (moderate-high). Profit is bouncing off a self-made bottom and could climb fast for a couple of years — the appeal here is the rebound, not endless growth.
The one big worry: the Homes.com fight against Zillow could turn into a money pit that never pays off — a permanent drain instead of a temporary investment.
Putting a number on it: our fair-value estimate is $47 against a current price of $32.22 — real upside if our numbers are right.
Our summary metrics
Net-cash balance sheet & beta 0.72, but a −63% 12-mo crash and GAAP earnings gutted to ~breakeven by the Homes.com spend.
14% fwd revenue / ~28% fwd adj-EPS CAGR, 77% gross margin, wide-moat subscription core — but GAAP ROIC near zero today.
Adj-EBITDA is re-accelerating hard off a self-inflicted trough; a $12B cap vs a large CRE+residential TAM leaves real room.
What does “fair value” mean?
Fair value is Synthos’s estimate of what one share is worth today, based on our model of the company’s future cash generation and the risks to it. It is not a price target or a prediction of where the stock trades next quarter — it’s the price where we think risk and reward are balanced. Above it, you’re paying for outcomes better than our base case; below it, the market is offering a margin of safety.
The model’s inputs and weightings are proprietary — they’re the product. What we publish is the output, plus an independent, public-math cross-check further down the page (“Check our number”) so you can judge it for yourself.
What do the 5 tiers mean? (Core · Tactical · Watch · Hold · Avoid)
Exponential Potential
Adj-EBITDA is re-accelerating hard off a self-inflicted trough; a $12B cap vs a large CRE+residential TAM leaves real room.
What could take this further than the base case — and where the market may be underpricing it. Full forward-growth and acceleration math in Deeper analysis, §4 below.
Deeper analysis
Technicals, fundamentals, valuation, and the full expert-claim evidence panel — the detail behind the numbers above.
Reference table
| Street consensus | $55.73 (high $74 / low $26; 18 Buy · 5 Hold · 2 Sell) — context, not our anchor |
| Valuation | 512× trailing GAAP EPS (meaningless — GAAP gutted by Homes.com spend) · 22× FY26E adj-EPS · 17× FY27E · 8× FY30E · EV/S 3.1× · EV/EBITDA ~14× FY26E |
| Technicals | Downtrend — $30, −69% off the 52-wk high, below 50/200-DMA, RSI 39, −63% 12-mo (SPY +21%) |
| Conviction | Low — only 1 KB voice (neutral). This is a fundamentals-and-quant call, not a conviction-panel call |
| Position sizing | Tactical / satellite, ~1–3% — a value-turnaround position, sized for a real bear tail |
What the experts actually said 1 traceable claims on CSGP · showing the highest-conviction voices
“CoStar's homes.com uses an advertising (not lead-gen) model and boosts Zillow-banned listings, potentially bifurcating the portal market especially for privacy-sensitive high-end homes.”
Every claim reconciles to a real claim_id in the Synthos knowledge base — this is the evidence the verdict is built on, not vibes. Management (the company itself) is shown but half-weighted; one cautionary voice is included on purpose.
Price & moving averages 12 months · 50 & 200-day averages · 52-week range
Solid line = price · dashed line = 50-day average · dotted line = 200-day average · the two thin horizontal lines mark the 52-week high and low. Price above both averages is an uptrend.
Data summary: last close $32.22, 7% above the 50-day average ($30), 28% below the 200-day average ($45) — a mixed trend. 64% below the 52-week high of $90, 19% above the 52-week low of $27.
Bollinger Bands 20-day average ± 2 standard deviations
The shaded band widens when the stock gets more volatile. Riding the upper edge = strong momentum (sometimes stretched); the lower edge = weak / potentially oversold.
Data summary: price $32.22 is currently inside the band (band $29–$34).
RSI (14) momentum gauge · 0–100
Above 70 (overbought zone, shaded) = overbought, below 30 (oversold zone, shaded) = oversold. Currently 54.
MACD 12 / 26 / 9 · trend & momentum
The MACD line crossing above the signal line (bars flip to the up color) = momentum turning up; crossing below (bars flip to the down color) = turning down. Bar height = the size of that gap.
Data summary: MACD is currently below its signal line by 0.01, negative momentum.
Relative performance vs S&P 500 & its sector (XLRE (sector)), set to 100 a year ago
Solid = CSGP · dashed = S&P 500 · dotted = XLRE (sector). A rising line means it is beating that benchmark — the sector line shows whether it is a leader or laggard within its own group.
Forward revenue & earnings actual → estimate · "FY" = fiscal year, "E" = estimate
Darker bars = actual results, brighter = analyst estimates. Taller bars to the right = expected growth.
Key stats an RIA wants
1. What it is
CoStar Group (NASDAQ: CSGP) is a global provider of information, analytics, and online marketplaces for commercial real estate (CRE), multifamily/apartments, and — increasingly — residential. Founded 1987, headquartered in Arlington, VA; CEO and founder Andy Florance still runs it. Fiscal year ends December 31. The economic engine is a subscription franchise: CoStar Suite is the industry-standard CRE data platform that brokers, lenders, and investors are effectively required to license.
Revenue mix (FY2024 product segmentation, from filings — most recent granular breakout in the data file):
- CoStar Suite $1,020M — the crown jewel: near-monopoly CRE data/analytics, extremely sticky.
- Multifamily / Apartments.com (Online Marketplaces) — the largest and fastest-scaling marketplace franchise (the FY23 breakout shows Multifamily Online Marketplace at ~$914M; it is now the biggest single line).
- LoopNet $282M — commercial listings/advertising marketplace.
- Information Services $136M, Residential (Homes.com) ~$101M — the residential land-grab, still tiny relative to the marketing being spent on it.
By geography (FY2023, from filings): North America $2,366M (~96%) · Non-US $89M (~4%). This is an overwhelmingly US/North-America business — a moat-concentration strength but with limited international diversification. (FMP geographic segmentation lags the product detail; the shape is unchanged in FY24–25.)
FY2025 total revenue was $3.247B (+18.7% YoY) — a 60th consecutive quarter of double-digit growth, per management (see §9).
2. The expert thesis (traceable)
There is essentially no expert conviction coverage of CSGP in the Synthos KB. The knowledge base holds one claim, and it is neutral, not bullish:
- Business Breakdowns (
business_breakdowns-T7zvk9VzxM4:c9029905d3, stance neutral, conviction 45, skill 1.0, dated 2025-08-17): "CoStar's Homes.com uses an advertising (not lead-gen) model and boosts Zillow-banned listings, potentially bifurcating the portal market especially for privacy-sensitive high-end homes." This is a structural observation about the residential strategy — it neither underwrites nor condemns the stock.
So this verdict is explicitly fundamentals- and quant-driven, not conviction-panel-driven. kb_breadth = 1, kb_net_conviction = 0.0, net-bullish voices = 0. We are not borrowing anyone else's conviction here; the Buy — Tactical rests entirely on (a) the observable quality and stickiness of the CoStar Suite subscription franchise, (b) the reported and guided re-acceleration in adjusted EBITDA, and (c) the valuation disconnect laid out in §6. Where we cite the one KB claim, it is only for the Homes.com structural framing in §8/§11 — and it is neutral by design.
3. Synthos scores & the Bull / Base / Bear cases
The one-glance judgment — three scores, 0–10, each anchored to real metrics (not probabilities we can't honestly calibrate):
| Score | 0–10 | The read |
|---|---|---|
| Downside Risk (lower = safer) | 5 · Moderate | Net-cash balance sheet (~$0.6B net cash, net-debt/EBITDA −0.5×), beta 0.72, current ratio 2.2 — financially safe. But the stock already fell −69% from its high, GAAP earnings are ~breakeven, and the entire thesis hinges on a discretionary spend the board could keep escalating. |
| Growth Quality | 7 · Good | 77% gross margin, ~14% forward revenue CAGR, ~28% forward adjusted-EPS CAGR, a genuinely wide-moat subscription core, net-cash funding. Held below 8 because GAAP returns on capital are near zero today (ROIC ~−0.1%, ROE 0.3%) — the quality is in the model, not yet the reported returns. |
| Exponential Potential | 6 · Moderate-High | Adjusted EBITDA guided from a deliberate FY25 trough to $780–820M FY26 (+100%+ YoY in Q1) — the second derivative just turned sharply positive. A ~$12B cap against a large CRE-data + residential-portal TAM leaves real room. Not a small-cap 8–9, but a rare accelerating megacap-adjacent. |
The three cases (our own scenario model — assumptions shown; each target is a ~12–18-month fair value). We deliberately do not attach probabilities: the base case is by definition the expected path, so a weighted blend would just restate it with false precision. The cases bound the range; the scores above summarize them. All EPS figures below are management/Street adjusted EPS — GAAP is not meaningful while the Homes.com spend runs.
| Case | Key assumptions | Fair value |
|---|---|---|
| Bull | Homes.com gains real traction and marketing intensity eases; adj-EBITDA margin re-rates toward the low-30s%. FY27E adj-EPS beats to ~$1.95 (vs ~$1.78 cons); market pays a ~32× growth multiple as the profit story is re-believed. | ~$62 (+107%) |
| Base (our anchor) | Estimates roughly hit — FY26 adj-EPS ~$1.36, FY27E adj-EPS ~$1.78; a re-accelerating 14%-revenue / high-20s-EPS compounder with 77% GM earns a ~25× multiple, plus net cash. | ~$47 (+57%) |
| Bear | Homes.com keeps burning without payoff; marketing stays elevated, adj-EBITDA guidance slips. FY27E adj-EPS misses to ~$1.50; multiple de-rates to ~15× as the market treats it as a value-trap. | ~$26 (−13%) |
Synthos fair value = the base case, ~$47 (+57%), with the full $26–$62 span as the honest range. Our base sits below the Street's $55.73 consensus (we discount the residential optionality more heavily) while our bear aligns with the Street's $26 low (someone on the sell-side already models the value-trap). This is a tracked call — the Forecaster Scorecard grades it once it matures.
4. Exponential Potential
Synthos separates compounders (durable high returns on capital) from exponentials (accelerating, multi-baggers-from-here). CSGP is an unusual hybrid: a wide-moat compounder whose reported profit is inflecting off a self-inflicted trough, which is where the exponential-ness lives right now.
- Forward growth: revenue CAGR FY25→FY30E ~13.7% ($3.25B → $6.16B est); adjusted-EPS CAGR FY26→FY30E ~28% ($1.36 → $3.68 est) as marketing intensity normalizes and the subscription base compounds. GAAP EPS is not a useful denominator today.
- Acceleration (the 2nd derivative) is positive — the key tell: adjusted EBITDA grew ~100% YoY in Q1'26 (management), and full-year FY26 adj-EBITDA is guided to $780–820M vs an FY25 base near the mid-$400Ms — a near-doubling. This is the opposite of the decelerating megacaps we usually flag; CSGP's earnings power is re-accelerating because the depressant (Homes.com spend) was a choice, not a structural decline.
- Room to run: at ~$12.3B market cap CSGP is a fraction of the size its ~$6B-by-FY30 revenue and monopoly-adjacent CRE-data position could support, and the residential-portal TAM (a Zillow-scale opportunity) is genuinely large if Homes.com works. A re-rating from 22× to a normalized ~28× on a doubled EPS base is a plausible multi-year double — without heroic assumptions.
- Reinvestment runway: heavy, discretionary marketing + M&A (FY25 spent ~$2.35B on acquisitions, incl. Matterport-type 3D and lease-software assets) — productive if it converts to subscription revenue, value-destructive if it doesn't. That binary is exactly why this is Tactical, not Core.
Exponential Potential: Moderate-High (6/10). The appeal is a sharp, near-term earnings-power rebound off a deliberate bottom, not an open-ended growth runway. Own it for the re-rating, size it for the bear tail.
5. Financials (real numbers — FMP annual/quarterly)
- Revenue: FY25 $3.247B, +18.7% (FY24 $2.736B, +11.5% on FY23 $2.455B). Steady high-teens top-line — the growth never broke.
- Quarterly trajectory: Q1'25 $732M → Q2 $781M → Q3 $834M → Q4 $900M → Q1'26 $897M (+22.5% YoY). Consistent double-digit growth through the latest print.
- GAAP profitability collapsed on purpose: FY25 GAAP net income $7M (net margin 0.2%) vs FY24 $138.7M and FY23 $374.7M. Operating income was −$72M for FY25. This is the Homes.com marketing crater — selling & marketing was $1.56B (48% of revenue) in FY25.
- Adjusted metrics tell the real story: Q1'26 adjusted EBITDA $132M (+100% YoY), adjusted net income $94M, adjusted EPS $0.23 (+53% YoY) — per management's release (§9). Adjusted EBITDA is inflecting up while GAAP is still absorbing amortization and spend.
- Margins: gross 77.4% TTM (a superb, software-like data margin); GAAP operating margin −0.8% TTM; adj-EBITDA margin recovering toward the low-20s% and guided higher.
- Cash flow: FY25 operating CF $430M, capex −$389M (heavy — a new HQ/campus build), FCF just +$41M. Cash fell from $4.68B → $1.73B as ~$2.35B went to acquisitions. Watch FCF: it must inflect up as capex rolls off and marketing rationalizes.
- Balance sheet: net cash ~$0.6B (cash $1.73B vs total debt $1.14B), net-debt/EBITDA −0.5×, current ratio 2.2. Financially unassailable — the company can fund the Homes.com bet without stress, which is both reassuring and enabling.
6. Valuation — priced in or room?
The trailing GAAP P/E of 512× is a statistical artifact — it divides a $12B cap by $7M of deliberately-suppressed net income and should be ignored. The honest lenses:
- On adjusted/forward earnings CSGP is genuinely cheap: 22× FY26E adj-EPS ($1.36) → 17× FY27E ($1.78) → 8× FY30E ($3.68). The multiple compresses hard even at a flat price if estimates hit.
- EV/EBITDA ~14× FY26E (EV ~$11.7B / guided adj-EBITDA ~$800M) — for a 77%-gross-margin subscription data monopoly, that is a below-average multiple for the asset quality.
- EV/Sales 3.1× — a fraction of where CSGP traded for most of the last decade (often 10×+), reflecting the profit scare, not a revenue problem.
- Reverse read: at $30 the market is pricing CoStar as if the Homes.com spend is permanently value-destructive and the subscription franchise deserves a utility multiple. If Homes.com is even neutral (spend normalizes, no durable return required), the adjusted earnings base alone supports a materially higher price.
- Street targets (context): consensus $55.73, high $74, low $26 (18 Buy / 5 Hold / 2 Sell). FMP letter rating B− (P/E score weak on GAAP optics, debt/DCF scores solid). Our $47 base is below consensus — we haircut the residential optionality — but still +57% from spot. Not a value trap on the numbers; a quality-franchise-at-a-profit-scare-discount buy.
7. Technicals (from the tech block)
- Trend: down — hard. $30.00 sits below the 50-DMA ($32.93) and far below the 200-DMA ($54.22), and the 50 is below the 200 (death-cross posture). MACD −1.24 (negative).
- Location: −69% off the 52-week high ($96.83), only +5.9% off the 52-week low ($28.32) — i.e. near the bottom of a brutal range, with a max drawdown of −69.9% from peak. This is a knife that has largely finished falling but has not yet turned.
- Momentum: RSI(14) 38.7 — near oversold, not yet capitulation-washed, no overbought risk.
- Relative strength (the ugly tell): CSGP −63.4% 12-mo vs SPY +20.6% and QQQ +30.3%; −24.3% 3-mo vs SPY +13.7%. Severe, persistent underperformance — the market has thoroughly discarded this name.
- Read: technicals do not confirm the fundamental thesis — there is no uptrend to lean on. This is a contrarian, value-turnaround entry against a downtrend, which is precisely why it's sized Tactical and why the July 28 earnings print (§10) matters as the potential trend-breaker. Scale in; don't chase.
8. Moat & competitive position
CoStar's moat is a genuine data network effect: CoStar Suite aggregates the most complete CRE database in North America, built over decades of field research, and brokers/lenders/investors must subscribe to compete — switching costs and completeness compound. Apartments.com is the category-leading multifamily marketplace. These are durable, high-margin, sticky franchises — the reason the stock deserves a premium in normal times.
The contested front is residential (Homes.com) vs Zillow/Redfin. Per the one KB voice (business_breakdowns-T7zvk9VzxM4:c9029905d3, neutral): Homes.com's advertising model (vs Zillow's lead-gen) and its willingness to surface Zillow-banned/"private" listings could bifurcate the portal market, especially for privacy-sensitive high-end homes. That is the bull optionality — and the bear money-pit — in one sentence. Management claims early traction (organic traffic +119% YoY, 35,000 members +200% in Q1'26), but monetization at scale is unproven.
Peer set (from the data file, market cap): the listed peers are brokerage/services firms, not true data comps — CBRE $41.5B, JLL $15.2B, FirstService $6.7B, Colliers (CIGI) $4.9B, Cushman & Wakefield (CWK) $3.3B, Newmark (NMRK) $2.5B, Marcus & Millichap (MMI) $1.2B, Anywhere (HOUS) $2.0B, RE/MAX $0.2B. CSGP's real competitive frame is a data/marketplace monopoly (no listed pure peer) facing Zillow on the residential flank — a distinction the peer list obscures.
9. Management, capital allocation & guidance
- Capital allocation: founder-CEO Andy Florance is running an aggressive, high-conviction land-grab — >$1.5B/yr selling & marketing plus ~$2.35B of FY25 acquisitions — funded from a net-cash balance sheet. This is either visionary category expansion or empire-building; the FCF conversion over the next 4–6 quarters is the referee. A $575M buyback in FY25 signals some capital-return discipline alongside the spend.
- Insider activity: the recent Form 4s are routine director equity awards (2026-06-23, ~8,262 shares each at $0 — annual grants) plus a small officer tax-withholding disposition (Cann, 461 shares at $32.04). No signal — no cluster of discretionary open-market selling in the sampled window.
- Management's own guidance (half-weighted — their self-interested words): the SEC 8-K (Q1'26 release, filed 2026-04-28) is a real earnings release with explicit forward guidance. Management reaffirms FY26 revenue of $3.78–3.82B (~17% growth), raises FY26 adjusted EBITDA to $780–820M (+$30M at the midpoint), and guides FY26 adjusted EPS of $1.32–1.39 on 409M shares. For Q2'26: revenue $922–932M (~19% growth), adj-EBITDA $160–180M, adj-EPS $0.27–0.30. CEO Florance: "60 consecutive quarters of consistent double-digit revenue growth… Adjusted EBITDA exceeded our expectations and was 26% higher than the midpoint of our guidance." We half-weight this — it is management's own book — but the reaffirm-and-raise on EBITDA is the concrete evidence behind the inflection thesis. Note: guidance is adjusted, and adjustments exclude the very stock-comp and integration costs that dented GAAP.
10. Catalysts & what to watch
- Next earnings: 2026-07-28 (Q2'26; Street EPS $0.28, revenue ~$929M — right at the guided range). The record has beaten estimates 6 straight quarters (Q1'26 adj-EPS $0.23 vs $0.17 est) — a beat-and-hold on the EBITDA ramp is the most likely trend-breaker.
- Adjusted-EBITDA margin trajectory: the single most important number — is the marketing intensity actually easing, or is the "raise" front-loaded?
- Homes.com monetization: members and traffic are growing; revenue-per-member and net-new-bookings are what convert it from cost center to franchise.
- FCF inflection: as the HQ capex rolls off and marketing rationalizes, FCF should climb well above FY25's $41M — the proof the model works.
- Net-new bookings ($67M in Q1'26, +20%) — the leading indicator of forward subscription revenue.
Thesis tripwires (what would change the call): two consecutive quarters of adj-EBITDA guidance cuts; net-new bookings decelerating below ~10%; Homes.com spend re-escalating with no monetization; or FCF failing to inflect above ~$200M run-rate.
11. Key risks
- Homes.com money-pit (the structural bear): the residential assault on Zillow could burn cash indefinitely without a durable return — the neutral KB voice frames the strategy (
business_breakdowns-T7zvk9VzxM4:c9029905d3) but not its ROI. This is the risk that justifies Tactical sizing. - GAAP earnings quality: the entire bull case runs on adjusted numbers that exclude heavy stock-comp (~$194M FY25) and integration costs; a skeptic can fairly argue the "real" earnings are thinner than the adjusted print.
- Downtrend / no technical support: −63% 12-mo, below both moving averages, death-cross — falling knives can keep falling; there is no chart to lean on.
- Founder/key-person concentration: Andy Florance's conviction is the strategy; the same drive that built the moat is funding the residential bet.
- CRE cyclicality: the core subscription base is exposed to a commercial-real-estate transaction slowdown, though the subscription model has proven resilient (60 straight double-digit quarters).
- Multiple re-rating cuts both ways: if the profit story stalls, the market could re-anchor to a utility multiple and the "cheap" 17× FY27 becomes "expensive" on lower estimates.
12. Verdict, position sizing & monitoring
Buy — Tactical. CoStar pairs a genuinely wide-moat subscription-data franchise (77% gross margin, 60 consecutive double-digit-growth quarters, net-cash balance sheet) with a 512× trailing-GAAP optic that is entirely an artifact of a deliberate Homes.com spend — and adjusted EBITDA is now guided to roughly double off that self-inflicted trough. At $30 the stock trades at ~17× FY27 adjusted EPS and ~14× FY26 EV/EBITDA, a clear discount to the asset's quality, with a Street that sees $55.73. This is not a conviction-panel call — the KB holds a single neutral voice — it is a fundamentals-and-quant turnaround. The reason it is Tactical not Core: the whole re-rating hinges on a discretionary, unproven residential bet, and there is no uptrend yet to confirm it.
- Sizing: tactical / satellite, ~1–3% of the flagship — a value-turnaround position, deliberately sized for the bear tail (−13% to $26). Scale in against the downtrend rather than lumping; the July 28 print is the natural add/trim checkpoint.
- Monitoring: re-underwrite on the §10 tripwires; formal re-score each earnings print. This verdict is logged as a tracked Synthos call as of 2026-07-03 at $30.00.
- Single biggest risk: the Homes.com residential land-grab becomes a permanent cash drain rather than a temporary investment — the one outcome that turns cheap into a value trap.
Provenance & disclosures
- Traceability: 1 KB claim, breadth 1, single voice neutral (Business Breakdowns, skill 1.0), last claim 2025-08-17 — reconciled to a real
claim_id(cited inline). Net-bullish voices = 0; conviction = Low; verdict is fundamentals/quant-driven, stated plainly. Fabricated conviction is structurally impossible (claim-ID reconciliation). - Data as-of: fundamentals 2026-03-31 (Q1'26) · estimates & prices 2026-07-02/03 · expert claim 2025-08-17. Forward figures are analyst consensus / management guidance (FMP + SEC), labeled as estimates.
- Management caveat: the Q1'26 8-K guidance is management's own book, half-weighted by design, and is stated in adjusted (non-GAAP) terms that exclude stock-comp and integration costs.
- Not investment advice. Independent research, educational and informational only, never personalized. Hypothetical/forward figures are labeled; the only performance numbers Synthos will headline are the live, real-money Flagship's.
- Version: 2026-07-03. Prior versions available via the deep-dive version dropdown ("based on the info at the time").