CoStar Group (CSGP) Q1 2026 earnings review
Massive Margin Inflection as Residential Bets Pay Off
CoStar Group delivered a stellar Q1, marked by a 23% YoY revenue jump to $897 million and an explosive 100% YoY increase in Adjusted EBITDA to $132 million. The aggressive cash burn that defined the 2024-2025 Homes.com expansion is rapidly Reversing into profitability. The company confidently raised full-year FY26 Adjusted EBITDA guidance by $30 million to an $800 million midpoint, signaling that the heavy lifting of user acquisition is yielding operating leverage. While GAAP net income remains depressed by heavy amortization and stock-based compensation, the underlying cash engine is firing on all cylinders.
🐂 Bull Case
The Residential Real Estate (RRE) segment is officially turning the corner. After deep losses in early 2025, Q1 26 RRE Adjusted EBITDA improved to $(29)M from $(85)M a year ago. Full-year FY26 guidance projects $110M-$130M in RRE Adjusted EBITDA, implying massive profitability in the second half of the year.
CoStar recorded its 60th consecutive quarter of double-digit revenue growth. The 23% YoY top-line expansion proves that Homes.com and Apartments.com are successfully capturing market share despite fluctuating macroeconomic conditions.
🐻 Bear Case
Despite $132M in Adjusted EBITDA, GAAP Net Income was just $3M. The gap is driven by heavy structural expenses: $64M in acquired intangible amortization and $42M in stock-based compensation. Investors buying the Non-GAAP story must tolerate significant real-world dilution and capital depletion.
Net new annualized bookings of $67M grew 20% YoY, but represent a sharp sequential Deceleration from the peak of $93M in 25Q2 and $84M in 25Q3. The initial hyper-growth phase of Homes.com onboarding may be normalizing.
⚖️ Verdict: 🟢
Bullish. CoStar is successfully executing one of the most expensive and aggressive market share grabs in real estate portal history. With the Residential segment shifting from a cash incinerator to a profit driver, the margin expansion thesis is highly credible.
Key Themes
Residential Segment: Reversing the Cash Burn
The most important takeaway from this print is the trajectory of the Residential Real Estate (RRE) segment. Driven by the monetization of Homes.com, the segment is Reversing its severe cash bleed. RRE Adjusted EBITDA improved from $(85)M in 25Q1 to $(29)M in 26Q1. Even more impressively, management guided FY26 RRE Adjusted EBITDA to $110M-$130M. Because Q1 printed at $(29)M and Q2 is guided to a ~$5M midpoint, H2 2026 must generate approximately $144M in RRE Adjusted EBITDA to hit the annual target. This is a dramatic, highly accretive inflection point.
AI Product Launches Fueling Engagement
CoStar explicitly named AI as a primary growth driver, not just a buzzword. The February launch of the 'Homes.com AI application' directly contributed to a 119% YoY increase in organic traffic for the quarter. Additionally, the introduction of 'Smart Search' on Apartments.com—featuring natural language and AI-powered voice search—is extending their technological lead. These features are increasing user 'time on site' and lowering bounce rates, creating a stickier ecosystem for advertisers.
Commercial Real Estate Provides Stable Foundation
While Residential grabs the headlines, the Commercial Real Estate (CRE) segment remains the Stable cash cow funding the war effort. CRE revenue grew 15% YoY to $472M in Q1, with the core CoStar product contributing $331M. The segment generated $161M in Adjusted EBITDA (a 34% margin), demonstrating resilience across 'a wide range of economic conditions' and insulating the company from residential market volatility.
Decelerating Net New Bookings
Net new annualized bookings came in at $67M. While this is a 20% YoY increase, it marks a notable Decelerating trend sequentially from the mid-2025 peaks ($93M in 25Q2 and $84M in 25Q3). This suggests the explosive initial agent onboarding wave for Homes.com is transitioning into a more mature, normalized sales cycle, requiring closer monitoring in H2.
GAAP vs. Non-GAAP Earnings Chasm
The disparity between CoStar's reported and adjusted earnings remains massive. The company celebrated $132M in Adjusted EBITDA and $94M in Adjusted Net Income, yet GAAP Net Income was merely $3M. The adjustments include $64M for acquired intangible asset amortization and $42M in stock-based compensation. While amortization is a non-cash accounting artifact, the $42M SBC is a real cost to shareholders, up 40% YoY, continuing a multi-year trend of high dilution.
Other KPIs
Management aggressively returned capital, executing $505M in stock buybacks during a single quarter. This is a massive acceleration compared to the entire FY25, where they repurchased $500M total. This aggressive move depleted cash reserves from $1.63B to $1.21B but signals deep management conviction in the current valuation and the impending residential profitability inflection.
Agent adoption is Accelerating. Total members reached 35,000, up over 200% from the same period a year ago, and up from the 31,000 milestone reported at the end of FY25. This proves that the 'Your Listing, Your Lead' pitch is successfully converting traffic into paying subscribers.
Guidance
Stable. The $927M midpoint represents ~19% YoY growth. This implies a sequential acceleration from Q1's $897M, keeping the company firmly on track to cross the $1 billion quarterly revenue run-rate soon.
Accelerating. Management increased the full-year midpoint by $30M, citing Q1 outperformance. This $800M midpoint is dramatically higher than FY25's actuals, driven primarily by the Residential segment flipping from heavy investment to strong profitability.
Accelerating. The guidance was raised alongside EBITDA, assuming a 26% non-GAAP tax rate and a slightly reduced share count (409M shares) resulting from the aggressive Q1 buybacks.
Key Questions
Residential Steady-State Margins
Guidance implies the Residential segment will generate over $140M in Adjusted EBITDA in the second half of 2026 alone. As the initial investment phase concludes, what is the long-term steady-state EBITDA margin target for this segment?
Bookings Trajectory Normalization
Net new bookings of $67M represent a sequential decline from the mid-2025 peaks. Is this primarily due to seasonality, or are we seeing the natural maturation of the Homes.com sales cycle after the initial hyper-growth phase?
Capital Allocation Post-Buyback
After executing a massive $505M stock repurchase in a single quarter, how should investors think about the balance sheet priorities for the remainder of 2026? Is the appetite for large-scale M&A on pause while integrating Domain and Matterport?