CoStar: Homes.com ad spend peaks in 2025 while residential revenue is just beginning to scale

Stevie AI on CoStar Group, Inc. (CSGP-USA | costargroupi)

6/1/2026

Summary

CoStar Group is the dominant data and analytics infrastructure provider for commercial real estate, with a near-irreplaceable proprietary database built over three decades. The structural insight is this: the market is pricing CoStar as if the $550M annual Homes.com investment is a permanent drag on earnings, when in reality 2025 represents peak spend — and the residential segment is guided to reach profitability as early as Q2 2026. The investment cycle is maturing precisely as Homes.com traffic and advertiser monetization begin to inflect, creating a multi-year earnings acceleration that is not visible in trailing multiples. Recent financials reflect the deliberate investment phase rather than any deterioration in the core business. FY2023 revenue was $2.5B with net income of $0.4B and EPS of $0.92. FY2024 revenue grew to $2.7B, but net income fell sharply to $0.1B and EPS to $0.34 — entirely consistent with front-loaded Homes.com marketing and headcount investment compressing reported earnings. The commercial segment continues to compound with 92% quarterly renewal rates and 22% user growth, generating the recurring cash flows that are funding the residential buildout. At $32.2, the stock trades at approximately 68x trailing FY2024 EPS of $0.34 — a number that is structurally depressed by peak investment spend and therefore near-meaningless as a valuation anchor. Applying a 55x forward P/E to forecast EPS — justified by 16–20% revenue growth, improving operating leverage, and a dominant commercial information franchise with high recurring revenues — yields price targets of $26 (FY2025), $61 (FY2026), $89 (FY2027), and $122 (FY2028). The FY2026 target alone implies nearly 90% upside from current levels as operating leverage becomes visible in reported results. We initiate with a BUY.

Thesis

1. **The Commercial Real Estate Data Franchise Is Structurally Underappreciated** CoStar's commercial information segment — encompassing CoStar, LoopNet, STR, and Debt Solutions — is one of the most defensible subscription businesses in enterprise software. The proprietary lease, transaction, and property database has been assembled over 30 years through thousands of researchers, field teams, and data partnerships; it cannot be replicated by a new entrant in any commercially relevant timeframe. The 92% quarterly subscription renewal rate is not a marketing metric — it reflects genuine switching costs for brokers, lenders, and institutional investors whose workflows are built around CoStar data. User growth of 22% year-over-year to 317,000 active users signals that the addressable market penetration is still expanding, not plateauing. The new asset-based pricing model on LoopNet is particularly significant: by monetizing previously underpriced small-asset transactions, CoStar is expanding ARPU within its existing installed base without requiring net new customer acquisition. This is a capital-efficient source of revenue growth that carries near-100% incremental margin at the contract level and is not dependent on Homes.com execution. Management guidance for FY2026 commercial revenue of $1.955B–$1.975B (+7–9% YoY) reflects a conservative, recurring-revenue base that provides a durable earnings floor regardless of how the residential buildout proceeds. This segment alone, at scale, justifies a meaningful portion of the current enterprise value. 2. **Homes.com Is at Peak Investment — The Earnings Inflection Is Imminent** The single most important fact about CoStar's near-term earnings profile is that 2025 is expected to be peak Homes.com spend. The company has been investing approximately $550M annually in sales, marketing, and product development for Homes.com — a deliberate strategy to build audience scale and advertiser relationships before monetizing. That investment cycle is ending. Management guidance explicitly projects the residential segment to reach profitability in Q2 2026, a watershed moment that will fundamentally change how the market reads CoStar's income statement. Residential revenue is guided at $1.825B–$1.845B for full-year 2026, representing 32–34% growth (12–14% organic). This is not speculative — it is supported by Q1 2026 new homes advertising bookings accelerating to $1.5M quarterly net new bookings, Apartments AI launching in June 2026 ahead of the Apartmentalize trade show, and full Apartments.com feature parity on Homes.com expected by year-end. The product roadmap is concrete and on schedule. Critically, the operating leverage math is compelling. Adjusted EBITDA margin is guided at 17–19% in Q2 2026, approximately 700 basis points higher than Q2 2025 — in a single quarter. The four-year forecast shows adjusted EBITDA margins expanding from approximately 15% in 2025 toward 25%+ by 2028 as the fixed cost base scales against accelerating residential revenue. This is the classic SaaS/marketplace margin expansion pattern, and CoStar has the commercial segment cash generation to fund it without dilutive equity raises. 3. **The EPS Path From $0.47 to $2.22 Is the Valuation Catalyst** The four-year EPS trajectory — $0.47 in FY2025, $1.10 in FY2026, $1.62 in FY2027, $2.22 in FY2028 — represents a near-5x increase in earnings per share over four years. This is not achieved through financial engineering: it is driven by revenue scaling from $3.2B to $5.0B (57% total growth), operating leverage on a relatively fixed cost base, and the cessation of peak Homes.com investment spend. Free cash flow conversion is equally telling. FCF is forecast at -$0.2B in FY2025, turning positive at $0.2B in FY2026, reaching $0.6B in FY2027, and $1.0B in FY2028. Net cash grows from $3.4B in 2025 to $4.8B in 2028 — meaning the balance sheet strengthens materially even through the transition. The $3.4B net cash position in 2025 provides approximately $7.50 per share of balance sheet support at current share counts, offering meaningful downside protection if execution slips. For an investor buying at $32.2 today, the FY2025 earnings trough of $0.47 EPS is known and priced. What is not priced is the speed and magnitude of the subsequent recovery: FY2026 EPS of $1.10 represents a 134% year-over-year increase. Markets typically reprice growth assets aggressively when earnings inflection points become visible in quarterly results — Q2 2026, when residential segment profitability is achieved, is likely to be that catalyst. 4. **International Expansion Provides Optionality That Is Currently Valued at Near-Zero** CoStar's international portfolio — OnTheMarket in the UK and Domain Australia — adds a second growth vector that the market appears to be discounting almost entirely given the focus on the Homes.com domestic narrative. OnTheMarket positions CoStar as a direct competitor to Rightmove and Zoopla in the UK residential market, leveraging the same marketplace monetization playbook being executed in the US but in a market with structurally higher agent commission economics. The UK and Australian residential markets are large, fragmented at the portal level, and receptive to data-driven marketplace competition. CoStar's commercial data pedigree gives it credibility with institutional and professional property participants in both markets that pure residential portals lack. While neither market is expected to be a material revenue contributor in the near term, successful execution provides a third leg of growth beyond 2028 that could support premium multiple sustainment at that point. Matterport and BizBuySell within the Specialist Marketplaces segment add further optionality in 3D property visualization and business-for-sale transactions respectively. The cross-sell opportunity into CoStar's 317,000-strong commercial subscriber base — particularly for Matterport's spatial data capabilities — is an incremental revenue layer that requires no additional customer acquisition cost. 5. **Market Is Mispricing Peak-Investment Earnings as Structural Impairment** The core mispricing thesis is straightforward: the market is treating FY2024 EPS of $0.34 as a run-rate rather than a trough. At $32.2, the stock prices in approximately 30x FY2026 EPS of $1.10 — a multiple that implies either no margin expansion beyond 2026 or a significant probability of Homes.com failure. Neither assumption is well-supported by the evidence. The 92% renewal rate and 22% user growth in the commercial segment are not characteristics of a business under competitive pressure. Homes.com traffic metrics, while not publicly disclosed in granular form, are sufficient to support management's Q2 2026 profitability guidance, which represents a firm commitment rather than aspiration. The $780M–$820M adjusted EBITDA guidance for full-year 2026 — a raise from prior guidance — signals management confidence in the trajectory. Comparable marketplace and data businesses with 16–20% revenue growth and improving margins trade at 40–60x forward earnings. Zillow, CoStar's closest residential marketplace comparable in the US, trades at elevated multiples despite lower commercial business quality. CoStar's combination of commercial data dominance, residential marketplace scale, and international optionality justifies a premium to pure-play residential portals, not a discount. The current valuation gap closes as residential profitability is demonstrated in reported results.

Risks

1. **Homes.com Execution and Monetization Risk** Despite management's Q2 2026 profitability target, Homes.com remains a work-in-progress marketplace competing against Zillow and Realtor.com, both of which have decade-long head starts in consumer brand recognition and agent network depth. The residential portal market has historically been winner-take-most, and there is no guarantee that CoStar's agent-centric, non-portal model achieves the advertiser conversion rates necessary to sustain 32–34% revenue growth beyond the initial ramp. If new homes advertising bookings decelerate from the current $1.5M quarterly pace, or if full Apartments.com feature parity by year-end 2026 fails to drive meaningful traffic uplift, the FY2026 residential revenue guidance of $1.825B–$1.845B could prove optimistic. A 10% miss on residential revenue would reduce FY2026 EPS by approximately $0.20–$0.25, materially compressing the valuation re-rating thesis. 2. **Leverage and Debt Service Constraints** CoStar's debt-to-EBITDA ratio of 8.05x on an FY2024 basis with interest coverage of only 0.17x represents a genuine financial risk that is often underweighted in growth-focused analyses. While the $3.4B net cash position in FY2025 provides near-term liquidity, the combination of high gross debt and negative free cash flow through 2025 creates refinancing exposure if credit markets deteriorate or if revenue growth disappoints and EBITDA misses the 2026 improvement trajectory. Any scenario in which the Homes.com investment cycle extends beyond 2025 — requiring continued elevated spend — would strain the balance sheet and potentially force dilutive capital raises at a difficult moment in the stock price cycle. 3. **Commercial Real Estate Cyclicality and Transaction Volume Sensitivity** While CoStar's subscription model provides significant revenue visibility, a portion of LoopNet and Debt Solutions revenue is sensitive to commercial real estate transaction volumes, which remain below pre-2022 levels as higher interest rates have suppressed deal activity. A prolonged period of elevated rates, or a credit-driven distress cycle in commercial real estate (particularly office and retail), could slow LoopNet advertiser renewal rates and reduce Debt Solutions analytics demand. The new asset-based pricing model also requires active transaction markets to demonstrate ROI to smaller asset owners — a headwind if liquidity remains constrained. CoStar's 7–9% commercial revenue growth guidance for FY2026 already reflects a cautious view, but further deterioration in transaction volumes represents a downside risk to even that modest target. 4. **Competitive Pressure in Residential Portals From Well-Capitalized Incumbents** Zillow's Premier Agent model and Realtor.com's News Corp backing give incumbent residential portals substantial resources to defend market position through aggressive pricing, product investment, and co-marketing with large brokerage networks. Zillow's 'Super App' strategy — integrating search, mortgage origination, and closing services — creates a bundled competitor that is difficult to displace on a feature-by-feature basis. If Zillow responds to Homes.com's agent-centric model with improved listing agent economics or exclusive data partnerships, CoStar's differentiation narrative could weaken faster than the revenue trajectory suggests. There is also a platform risk in the rental market: Apartments.com competes with Zillow Rentals, Rent.com, and ApartmentList, all of which are investing aggressively in AI-driven search and recommendation features that could erode Apartments.com's incumbent advantage. 5. **International Expansion Execution and Integration Risk** OnTheMarket and Domain Australia represent material capital commitments in markets where CoStar has limited brand recognition and where incumbent portal operators (Rightmove in the UK, REA Group in Australia) have dominant positions and deep agent relationships. The UK residential portal market in particular is highly consolidated — Rightmove has repeatedly defended its dominant position against well-funded challengers including Zoopla and OnTheMarket itself prior to the CoStar acquisition. If international platforms require higher-than-anticipated marketing spend to achieve meaningful share gains, the operating leverage timeline for the consolidated group could be pushed out, deferring the FY2027–2028 free cash flow recovery. 6. **Multiple Compression Risk if Growth Disappoints** The BUY thesis is predicated on a 55x forward P/E multiple being sustained as earnings inflect — a multiple that reflects confidence in 16–20% revenue growth continuity and margin expansion. If any of the above risks materialise and FY2026 EPS comes in at $0.80 rather than $1.10, and if the market simultaneously re-rates the multiple downward to 35x on growth disappointment, the stock could trade at $28 — below current levels. High-multiple growth stocks are disproportionately sensitive to both earnings misses and multiple compression simultaneously, meaning the downside scenario is non-linear. Investors should size positions accordingly and monitor Q2 2026 residential profitability delivery as the critical validation point for the thesis.

📈 Price Targets