Robert W. Musslewhite
Chief Executive Officer at Definitive Healthcare Corp.
Sits on 3 boards. Last updated September 28, 2026
Time on boards
- Boards served
- 3
- Current seats
- 3
- Board service
- 8 years
- Director since
- 2023
8 years of board service in total across 3 boards, counting each seat separately. Longest: Definitive Healthcare Corp., 3 years.
Definitive Healthcare Corp.
Director · Chief Executive Officer
CoStar Group Inc.
Director
Cardinal Health Inc.
Director
Chief executive roles
Definitive Healthcare Corp.
· Chief Executive Officer
Until June 2024
· Former
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Jun 23, 2026 | CoStar Group Inc. | Grant or award | +8,262 | — | — |
| Nov 5, 2025 | Cardinal Health Inc. | Grant or award | +1,067 | — | — |
| Sep 9, 2025 | CoStar Group Inc. | Grant or award | +3,121 | — | — |
| Mar 15, 2025 | Cardinal Health Inc. | Grant or award | +1,049 | — | — |
| Jul 17, 2024 | CoStar Group Inc. | Grant or award | +3,293 | — | — |
| Jan 7, 2024 | Definitive Healthcare Corp. | Shares withheld for tax | −14,207 | $9.00 | $127,863 |
| Nov 4, 2023 | Definitive Healthcare Corp. | Shares withheld for tax | −12,656 | $7.27 | $92,009 |
| Oct 30, 2023 | CoStar Group Inc. | Grant or award | +3,532 | — | — |
| Oct 7, 2023 | Definitive Healthcare Corp. | Shares withheld for tax | −20,016 | $7.20 | $144,115 |
| Aug 4, 2023 | Definitive Healthcare Corp. | Shares withheld for tax | −12,657 | $11.31 | $143,151 |
| Jul 7, 2023 | Definitive Healthcare Corp. | Shares withheld for tax | −20,016 | $10.67 | $213,571 |
| May 4, 2023 | Definitive Healthcare Corp. | Shares withheld for tax | −53,587 | $9.90 | $530,511 |
| Apr 7, 2023 | Definitive Healthcare Corp. | Shares withheld for tax | −15,616 | $10.47 | $163,500 |
| Feb 16, 2023 | Definitive Healthcare Corp. | Grant or award | +368,422 | — | — |
| Jan 7, 2023 | Definitive Healthcare Corp. | Shares withheld for tax | −14,026 | $10.41 | $146,011 |
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