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
- 9 years
- Director since
- 2023
9 years of board service in total across 3 boards, counting each seat separately. Longest: Definitive Healthcare Corp., 3 years.
Chief executive roles
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
CoStar Group Inc. June 23, 202694.8%
-
Cardinal Health Inc. November 5, 202599.8%
-
CoStar Group Inc. June 26, 202596.4%
-
CoStar Group Inc. June 6, 202499.8%
-
CoStar Group Inc. June 8, 202399.3%
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 |
Questions about Robert W. Musslewhite
What boards is Robert W. Musslewhite on?
Robert W. Musslewhite sits on the boards of Cardinal Health Inc., CoStar Group Inc. and Definitive Healthcare Corp.
Has Robert W. Musslewhite been a CEO?
Yes — Robert W. Musslewhite was CEO of Definitive Healthcare Corp. (Until June 2024).
How long has Robert W. Musslewhite served on boards?
Our records show at least 9 years of board service across 3 boards, the earliest from 2023.
Reviews (0)
Sign in to write a review.
No reviews yet. Be the first to write one.