CoStar Group, Inc. (NASDAQ: CSGP) is set to be replaced by Lumentum Holdings in the Nasdaq-100 Index on May 18, as it faces a staggering 56% drop in stock value over the past year, closing at $33.05. Despite attracting over 131 million unique visitors in Q1 2026 and reporting a 22.5% year-over-year revenue growth, investor confidence is waning, highlighted by a sharp one-month decline of 15.92% and a notably high P/E ratio of 532.92. Activist investors and funds express dissatisfaction with the company’s performance, pressuring CoStar to reassess its financial strategy.
“CoStar Group · attracted · over 131 million average monthly unique visitors · in the first quarter of 2026”
“Lumentum Holdings · was replaced by · CoStar Group · in the Nasdaq-100 Index”
“CoStar Group, Inc. (NASDAQ:CSGP) · closed at · per share · $33.05”
“CoStar Group, Inc. (NASDAQ:CSGP) · had a one-month return of · -15.92%”
“CoStar Group, Inc. (NASDAQ:CSGP) · lost · over the past 52 weeks · 56.34%”
“Weitz Investment Large Cap Equity Fund · stated regarding · CoStar Group, Inc. (NASDAQ:CSGP) · stock continued to slide as activists and long-time investors grew restless”
“58 hedge fund portfolios · held · CoStar Group, Inc. (NASDAQ:CSGP) · at the end of the fourth quarter”
“CoStar Group · is a · global leader in commercial real estate information”
“CoStar Group’s websites · attracted · over 131 million average monthly unique visitors · in the first quarter of 2026”
“Lumentum · will replace · CoStar · on May 18”
“CoStar Group, Inc. · will be replaced by · Lumentum Holdings, Inc. · in the Nasdaq-100 Index”
“Real estate · includes · CoStar Group · true”
