What drove the drop
CoStar Group Inc. stock fell 14.3% in pre-open trading after the company released its Q2 2026 results late Tuesday. The market reaction followed a revenue guidance cut that fell short of consensus estimates, prompting a fast-moving after-hours sell-off that continued into the following session.
Earnings snapshot
On the upside, CoStar reported adjusted earnings per share of $0.32 versus an analyst consensus of $0.29. Adjusted EBITDA more than doubled year-over-year to $184 million, lifting the adjusted EBITDA margin to 20% from 11% in the prior-year period. Those profitability gains represented the company's strongest quarter of margin expansion in several years.
Top-line outlook and bookings
Investors, however, focused on the firm's forward revenue outlook. Management guided Q3 2026 revenue to a range of $935 million to $945 million, a midpoint that missed analyst consensus by roughly 2.9%. The company also trimmed its full-year 2026 revenue projection to $3.715 billion to $3.755 billion from a prior range centered near $3.8 billion.
Net new bookings totaled $69 million, a decline of approximately 26% year-over-year. Management characterized the lower bookings figure as stemming from deliberate strategic choices around efficiency rather than a sign of broad-market deterioration, but the reduction nonetheless raised questions about near-term revenue visibility.
Analyst reaction and market context
The guidance cut led Keefe, Bruyette & Woods to downgrade CoStar from Outperform to Market Perform and to reduce its price target to $29 from $41. The broader market offered little support: the NASDAQ declined about 0.3% while the S&P 500 was essentially flat, underscoring that the move was largely company-specific.
The stock had already been under pressure in recent weeks following the departure of the company's chief financial officer and earlier analyst target reductions. In pre-market trading the share price sat at $25.99, just above the 52-week low of $26.68.
Takeaway
Taken together, the combination of a revenue miss relative to expectations, a below-consensus forward guide, a sharp year-over-year decline in bookings, and a fresh analyst downgrade created significant selling pressure. Those negative drivers overwhelmed the quarter's marked improvement in profitability and pushed the stock toward multi-year lows.