DESMARAIS MICHAEL J 4

What Happened
Michael J. Desmarais, Chief Human Resources Officer of Costar Group (CSGP), was granted 17,676 Deferred Stock Units/Restricted Stock Units on 2026-03-10 (transaction code A — award/acquisition). The filing lists no trade price, but a footnote states the units were converted from his annual cash incentive at $46.34 per unit, implying a notional value of about $819,106. These RSUs vest in full after four years and are not an open-market purchase or sale.

Key Details

• Transaction date: 2026-03-10; Form 4 filed: 2026-03-11 (timely).
• Amount awarded: 17,676 Deferred Stock Units / Restricted Stock Units.
• Conversion price used in footnote: $46.34 per unit → implied total value ≈ $819,106.
• Shares owned after transaction: not specified in the filing.
• Footnote: Units were created by converting all or a portion of the reporting person's annual cash incentive into DSUs, and the company awarded RSUs that vest in full after four years.
• Transaction code: A (award/grant/acquisition). No mention of a 10b5-1 plan or tax withholding in the filing.

Context
RSUs/DSUs are compensation awards that typically cannot be sold until they vest; this award represents deferred pay rather than an outright market buy or sale. Such grants are common for executive compensation and do not by themselves indicate the insider is buying or selling shares on the open market.