Musslewhite Robert W

Director at CARDINAL HEALTH INC · on record since Mar 18, 2025
Director at ADVISORY BOARD CO · on record since Mar 10, 2009
Chief Executive Officer at ADVISORY BOARD CO · on record since Mar 10, 2009
Director at Evolent Health, Inc. · on record since Jun 5, 2015
Director at COSTAR GROUP, INC. · on record since Dec 23, 2019
Director at Definitive Healthcare Corp. · on record since Sep 15, 2021
Chief Executive Officer at Definitive Healthcare Corp. · on record since Oct 8, 2021

Insider trading activity of Musslewhite Robert W

Transactions on record: 354; since Mar 8, 2007

Open-market buys: 2; $349K

Open-market sells: 79; $23.8M

Companies traded: 4; last filing Jun 24, 2026

Figures computed from official regulatory filings — .

Companies where Musslewhite Robert W has traded

COSTAR GROUP, INC.7 tx · $250K · Jun 24, 2026
CARDINAL HEALTH INC2 tx · Nov 6, 2025
Definitive Healthcare Corp.13 tx · $2.6M · Jan 9, 2024
ADVISORY BOARD CO332 tx · $43.3M · Nov 21, 2017

Track record of Musslewhite Robert W

Insufficient history for a statistical track record (fewer than 5 open-market buys).

Transaction history of Musslewhite Robert W

Co-insiders of Musslewhite Robert W

BONDERMAN DAVIDCOSTAR GROUP, INC. +1

This page republishes public regulatory disclosures.

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
COSTAR GROUP, INC.Listing on record	Jun 24, 2026	Award	8,262	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
CARDINAL HEALTH INCListing on record	Nov 6, 2025	Award	1,067	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
COSTAR GROUP, INC.Listing on record	Sep 11, 2025	Award	3,121	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
CARDINAL HEALTH INCListing on record	Mar 18, 2025	Award	1,049	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
COSTAR GROUP, INC.Listing on record	Aug 5, 2024	Award	3,293	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Definitive Healthcare Corp.Listing on record	Jan 9, 2024	Other	-14,207	9.00 USD	$127.9K		SEC
Definitive Healthcare Corp.Listing on record	Nov 7, 2023	Other	-12,656	7.27 USD	$92K		SEC
COSTAR GROUP, INC.Listing on record	Nov 1, 2023	Award	3,532	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Definitive Healthcare Corp.Listing on record	Oct 10, 2023	Other	-20,016	7.20 USD	$144.1K		SEC
Definitive Healthcare Corp.Listing on record	Aug 8, 2023	Other	-12,657	11.31 USD	$143.2K		SEC
Definitive Healthcare Corp.Listing on record	Jul 11, 2023	Other	-20,016	10.67 USD	$213.6K		SEC
Definitive Healthcare Corp.Listing on record	May 8, 2023	Other	-53,587	9.90 USD	$530.5K		SEC
Definitive Healthcare Corp.Listing on record	Apr 11, 2023	Other	-15,616	10.47 USD	$163.5K		SEC
Definitive Healthcare Corp.Listing on record	Feb 21, 2023	Award	368,422	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Definitive Healthcare Corp.Listing on record	Jan 10, 2023	Other	-14,026	10.41 USD	$146K		SEC
Definitive Healthcare Corp.Listing on record	Oct 12, 2022	Other	-70,658	14.82 USD	$1M	Unusual size	SEC
COSTAR GROUP, INC.Listing on record	Sep 15, 2022	Award	3,380	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Definitive Healthcare Corp.Listing on record	May 5, 2022	Award	333,322	—	n/a (No price was disclosed in the filing)		SEC
Definitive Healthcare Corp.Listing on record	May 5, 2022	Award	83,333	—	n/a (No price was disclosed in the filing)		SEC
Definitive Healthcare Corp.Listing on record	Oct 8, 2021	Award	650,000	—	n/a (No price was disclosed in the filing)		SEC
COSTAR GROUP, INC.Listing on record	Sep 17, 2021	Award	2,811	88.95 USD	$250K		SEC
COSTAR GROUP, INC.Listing on record	Sep 25, 2020	Award	214	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ADVISORY BOARD COListing unverified	Nov 21, 2017	Other	-44,220	—	n/a (No price was disclosed in the filing)		SEC
ADVISORY BOARD COListing unverified	Nov 21, 2017	OtherD (derivative)	-57,752	—	n/a (No price was disclosed in the filing)		SEC
ADVISORY BOARD COListing unverified	Nov 21, 2017	Other	-2,839	47.50 USD	$134.9K		SEC

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
COSTAR GROUP, INC.Listing on record	Jun 24, 2026	Award	8,262	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
CARDINAL HEALTH INCListing on record	Nov 6, 2025	Award	1,067	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
COSTAR GROUP, INC.Listing on record	Sep 11, 2025	Award	3,121	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
CARDINAL HEALTH INCListing on record	Mar 18, 2025	Award	1,049	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
COSTAR GROUP, INC.Listing on record	Aug 5, 2024	Award	3,293	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Definitive Healthcare Corp.Listing on record	Jan 9, 2024	Other	-14,207	9.00 USD	$127.9K		SEC
Definitive Healthcare Corp.Listing on record	Nov 7, 2023	Other	-12,656	7.27 USD	$92K		SEC
COSTAR GROUP, INC.Listing on record	Nov 1, 2023	Award	3,532	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Definitive Healthcare Corp.Listing on record	Oct 10, 2023	Other	-20,016	7.20 USD	$144.1K		SEC
Definitive Healthcare Corp.Listing on record	Aug 8, 2023	Other	-12,657	11.31 USD	$143.2K		SEC
Definitive Healthcare Corp.Listing on record	Jul 11, 2023	Other	-20,016	10.67 USD	$213.6K		SEC
Definitive Healthcare Corp.Listing on record	May 8, 2023	Other	-53,587	9.90 USD	$530.5K		SEC
Definitive Healthcare Corp.Listing on record	Apr 11, 2023	Other	-15,616	10.47 USD	$163.5K		SEC
Definitive Healthcare Corp.Listing on record	Feb 21, 2023	Award	368,422	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Definitive Healthcare Corp.Listing on record	Jan 10, 2023	Other	-14,026	10.41 USD	$146K		SEC
Definitive Healthcare Corp.Listing on record	Oct 12, 2022	Other	-70,658	14.82 USD	$1M	Unusual size	SEC
COSTAR GROUP, INC.Listing on record	Sep 15, 2022	Award	3,380	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Definitive Healthcare Corp.Listing on record	May 5, 2022	Award	333,322	—	n/a (No price was disclosed in the filing)		SEC
Definitive Healthcare Corp.Listing on record	May 5, 2022	Award	83,333	—	n/a (No price was disclosed in the filing)		SEC
Definitive Healthcare Corp.Listing on record	Oct 8, 2021	Award	650,000	—	n/a (No price was disclosed in the filing)		SEC
COSTAR GROUP, INC.Listing on record	Sep 17, 2021	Award	2,811	88.95 USD	$250K		SEC
COSTAR GROUP, INC.Listing on record	Sep 25, 2020	Award	214	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ADVISORY BOARD COListing unverified	Nov 21, 2017	Other	-44,220	—	n/a (No price was disclosed in the filing)		SEC
ADVISORY BOARD COListing unverified	Nov 21, 2017	OtherD (derivative)	-57,752	—	n/a (No price was disclosed in the filing)		SEC
ADVISORY BOARD COListing unverified	Nov 21, 2017	Other	-2,839	47.50 USD	$134.9K		SEC