Robert W Musslewhite
CIK 1390194 · Chief Executive Officer · last filed 2026-06-24
Robert W Musslewhite is a Chief Executive Officer who has filed 114 SEC Form 4 insider transactions across 4 companies since 2007. The most recent filing, for CSGP, was dated Jun 24, 2026. Across all open-market trades the lifetime net is −$23.4M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $2.8M across reported positions. 100 SEC filings were submitted jointly with ADVISORY BOARD CO.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
ABCO price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
1201 WILSON BLVD.
ARLINGTON, VA 22209
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| CSGP | Director | 26,539 | $31.18 | $827.5K | $0 | 7 | 2026-06-24 |
| CAH | Director | 2,116 | $272.79 | $577.2K | $0 | 2 | 2025-11-06 |
| DH | Chief Executive Officer | 1,201,638 | $1.14 | $1.37M | $0 | 12 | 2024-01-09 |
| ADVISORY BOARD CO (ABCO) Delisted | Chief Executive Officer | 525,800 | — | — | -$23.41M | 91 | 2017-04-20 |
Recent Filings
114 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-06-24 | CSGP | Grant (A) | +8,262 | $0 | EDGAR |
| 2025-11-06 | CAH | Grant (A) | +1,067 | $0 | EDGAR |
| 2025-09-11 | CSGP | Grant (A) | +3,121 | $0 | EDGAR |
| 2025-03-18 | CAH | Grant (A) | +1,049 | $0 | EDGAR |
| 2024-08-05 | CSGP | Grant (A) | +3,293 | $0 | EDGAR |
| 2024-01-09 | DH | Tax (F) | −14,207 | -$127.9K | EDGAR |
| 2023-11-07 | DH | Tax (F) | −12,656 | -$92.0K | EDGAR |
| 2023-11-01 | CSGP | Grant (A) | +3,532 | $0 | EDGAR |
| 2023-10-10 | DH | Tax (F) | −20,016 | -$144.1K | EDGAR |
| 2023-08-08 | DH | Tax (F) | −12,657 | -$143.2K | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.