CoStar Group is trading at $29.00, down 9.40% in after-hours trading, with $37 million in net new bookings a potential concern despite raised guidance. - Q3 revenue was $952 million and adjusted EBITDA was $229 million; the company raised full-year revenue and EBITDA guidance. - CoStar Group announced a $730 million Vexcel acquisition. - Shares had closed down 5.01% at $32.01 before the additional after-hours decline; broad indexes rose, so general market weakness does not explain the move.