02:26 PM EDT, 03/10/2026 (MT Newswires) -- (Updates with the stock decline in the headline and first paragraph.)

CoStar Group ( CSGP ) shares fell 4.9% in Tuesday trading after stockholder D.E. Shaw criticized the board of the commercial real estate data provider, saying recent changes in the company's reporting segments "reduce transparency into the financial results."

The new reporting approach "effectively buries the poor financial results of Homes.com within a new, amalgamated 'Residential' segment that incorporates the larger and more profitable Apartments.com business," D.E. Shaw said in a letter to the board.

Additionally, CoStar ( CSGP ) has also stopped disclosing net new bookings for Homes.com, a key operating metric used by investors to track the progress of the business, D.E. Shaw said.

"We view the recent segment reorganization as the board's latest attempt to shield Homes.com from scrutiny rather than subject it to rigorous oversight," D.E. Shaw said.

CoStar ( CSGP ) did not immediately respond to request for comment from MT Newswires.

Price: 46.06, Change: -2.36, Percent Change: -4.87