Core Viewpoint - Hedge fund D.E. Shaw is advocating for significant changes at CoStar Group, including a board shake-up, due to concerns over the company's underperformance and its investment strategy [1][3]. Group 1: Company Performance and Strategy - D.E. Shaw attributes CoStar's share underperformance to its "high-risk, money-losing" investment in Homes.com, which aggregates home listings [2]. - CoStar's market value is approximately $22 billion, with shares down over 23% year-to-date, partly due to investor concerns about overspending and increased competition [6]. - D.E. Shaw criticizes CoStar's current leadership, particularly Andrew Florance, for being tied to the unsuccessful Homes.com strategy and claims the board is failing in its oversight responsibilities [5]. Group 2: Proposed Changes - D.E. Shaw is calling for CoStar to monetize Homes.com, refocus on its core business, initiate stock buybacks, and restructure executive compensation [5]. - While D.E. Shaw has not explicitly stated plans for a proxy fight, it has left the possibility open in its communications [5]. Group 3: Company Background - CoStar, founded in the 1980s by Andrew Florance, has established itself as a leading provider of commercial real estate data, expanding its offerings over the years to include various property types [4]. - The company's recent expansion into the single-family housing market through Homes.com has been met with challenges, particularly from established competitors like Zillow Group and Realtor.com [5].