CSGP — CoStar Group, Inc.

The market has de-rated CoStar aggressively in 2026: Q2 revenue of $925M missed consensus of ~$928.8M, management cut full-year revenue guidance to $3.715-3.755B, and several analysts cut targets or downgraded the stock (KBW to Market Perform, Citizens to a lower target). Although adjusted EBITDA more than doubled to $184M in Q2 and the balance sheet is solid, investors are focused on decelerating top-line growth and intensifying residential-portal competition rather than the margin story.

Revenue growth decelerated from 22.5% YoY in Q1 2026 to 18.4% YoY in Q2 2026, and management's full-year guide-down points to further softening, partly deliberate (Homes.com headcount and marketing cuts) and partly Ten-X-driven. The more notable trend is the profit inflection: GAAP operating income went from -$51.1M in Q3 2025 to -$27.2M, +$3M, and +$76M in Q2 2026, producing the best operating margin in the period at 8.2%. This is not a one-quarter fluke—it matches management's explicit EBITDA-expansion pivot—but TTM free cash flow is still roughly -$257M after heavy 2025 capex, so the cash-flow confirmation is not complete.

On trailing GAAP earnings, CSGP looks expensive: P/E TTM is 170.6, net margin is 2.1%, and ROIC is slightly negative. But those are trough earnings. On forward fundamentals, valuation is far more reasonable: forward P/E is about 23x using next-FY estimated EPS of $1.363, EV/2026E adjusted EBITDA is about 15.5x against the $800M guidance midpoint, and price-to-sales is 3.57x versus a 5-year average of 12.73x. That is cheap relative to its own history, though not a classic deep-value stock—it is a growth-to-maturity transition trading at a reasonable, not fire-sale, multiple.

At $31.34, the market is no longer paying for CoStar's old hypergrowth premium; it is paying a reasonable forward multiple for a company that must prove its margin gains are durable. If FY26 adjusted EBITDA actually lands at $800M and revenue stabilizes above $3.7B, the stock is modestly undervalued. But if the guidance cut is the first of several and Homes.com competition forces marketing spend back up, the forward 'E' keeps resetting lower and $31.34 will not look cheap. The next few quarters are about earnings delivery, not narrative.

As of 2026-08-27, RSI stood at 50.46—neutral, having recovered from oversold but not overbought. Price was essentially flat to the 20-day SMA (-0.08%), 4.25% above the 50-day SMA, and 30.07% below the 200-day SMA. That is a stock attempting to base in the high-$20s/low-$30s after a violent downtrend, but it has not reclaimed its long-term trend. Entry timing is not obvious: a confirmed close above the 50-day on volume would be more constructive, while a breakdown below $25.89 would reopen downside. Current technicals are range-bound, not a confirmed bottom.

• High interest rates continue to dampen commercial real estate and residential transaction volumes, directly pressuring Ten-X and brokerage-related revenue.
• Housing affordability and new-home construction activity are mixed; the Zonda acquisition adds exposure to the cyclical $400B U.S. new-home market.
• Data center and industrial real estate demand is a tailwind for CoStar's commercial data products, partially offsetting weak office fundamentals.
• Fierce competition in residential portal advertising—Zillow, Realtor.com, and others—limits pricing power and could force renewed marketing spend.
• Regulatory and litigation risk over data and listing practices is an ongoing industry overhang; CoStar resolved Delaware litigation in mid-August 2026.

• Q3 2026 earnings in late October/early November: confirmation that Homes.com cost discipline and the $780-820M adjusted EBITDA guidance are holding.
• Zonda integration: cross-selling new-home data and marketplace products into CoStar's existing builder/Homes.com ecosystem could re-accelerate bookings.
• A Fed rate-cut cycle or CRE transaction thaw would directly benefit Ten-X and overall market sentiment.
• Positive analyst revisions after the recent target cuts—consensus price target is ~$36.36 with 16 Buy ratings vs. 9 Holds and 2 Sells.

• Revenue guidance was cut; if Ten-X and Homes.com bookings keep decelerating, EBITDA gains may not offset top-line shortfalls.
• Residential portal competition could force CoStar to reverse course and resume heavy marketing, unwinding the margin inflection.
• GAAP profitability is still thin (net margin ~2.1%) and TTM free cash flow is negative; sustained high capex would narrow the financial cushion.
• Zonda integration and cost-synergy execution risk, including potential consolidation charges or slower-than-expected cross-sell.
• Technically, price is 30% below the 200-day SMA; if support near $25.89 fails, momentum selling could drive the stock lower.

As of 2026-08-27, CSGP is a good but not exceptional risk/reward. It is a high-quality data franchise with a fortress balance sheet, 76.5% gross margins, and a visible operating-margin inflection, but it just guided revenue down and faces serious competitive pressure in residential search. At $31.34 the market is pricing in a mature, slower-growth company rather than the old CoStar premium; selective buying near $30 or on confirmed Q3 margin delivery makes sense, but I would not chase strength yet.

Calculated by applying a 17x EV/2026E adjusted EBITDA multiple to the $800M guidance midpoint, which reflects ~18% revenue growth and 76% gross margins discounted for post-guidance execution risk, then adding $272M net cash and dividing by ~405M shares. This yields $34.20, about 9% above the 2026-08-27 price of $31.34.