Robert H Niehaus
CIK 1241677 · Chairman, GCP · last filed 2026-10-02
Robert H Niehaus is a Chairman, GCP who has filed 112 SEC Form 4 insider transactions across 11 companies since 2007. The most recent filing, for IRDM, was dated Oct 2, 2026. Across all open-market trades the lifetime net is −$67.4M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $41.1M across reported positions. 34 SEC filings were submitted jointly with GREENHILL & CO INC.
"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.
GHL 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
1676 INTERNATIONAL DRIVE, SUITE 1100
MCLEAN, VA 22102
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| IRDM | Director | 43,315 | $45.10 | $1.95M | -$14.64M | 43 | 2026-10-02 |
| ZETA | Director | 671,772 | $32.27 | $21.68M | -$3.09M | 11 | 2026-07-02 |
| HEARTLAND PAYMENT SYSTEMS INC (HPY) Delisted | Director | 112,722 | — | — | -$4.75M | 23 | 2016-03-11 |
| GREENHILL & CO INC (GHL) Delisted | Chairman, GCP | 125,631 | $14.99 | $1.88M | -$47.09M | 11 | 2010-02-04 |
| Iridium Communications Inc. (IRDMW) Delisted | Director | — | — | — | $0 | 1 | 2009-09-30 |
| Iridium Communications Inc. (GHQ.WS) Delisted | Senior Vice President | 398,276 | — | — | $1.94M | 5 | 2009-09-02 |
| EXCO RESOURCES INC (XCO) Delisted | Director | 15,622 | — | — | $0 | 9 | 2009-04-03 |
| Crusader Energy Group Inc. (KRU) Delisted | Director | 126,596 | — | — | $210.1K | 2 | 2008-12-08 |
| Iridium Communications Inc. (GHQ.U) Delisted | Senior Vice President | 200,000 | — | — | $0 | 1 | 2008-03-13 |
| CCI | Director | 197,054 | $88.48 | $17.44M | $0 | 1 | 2007-03-14 |
| AMERICAN ITALIAN PASTA CO (ECR) Delisted | Director | 1,325 | — | — | $0 | 1 | 2007-02-20 |
Recent Filings
112 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-10-02 | IRDM | Grant (A) | +55 | $0 | EDGAR |
| 2026-08-19 | IRDM | Gift (G) | −50,000 | $0 | EDGAR |
| 2026-07-02 | ZETA | Grant (A) | +7,197 | $0 | EDGAR |
| 2026-07-02 | IRDM | Grant (A) | +377 | $0 | EDGAR |
| 2026-05-12 | ZETA | Mixed | +346,110 | $0 | EDGAR |
| 2026-04-02 | IRDM | Grant (A) | +742 | $0 | EDGAR |
| 2026-01-07 | IRDM | Grant (A) | +18,426 | $0 | EDGAR |
| 2025-10-29 | IRDM | Buy (P) | +30,000 | $524.7K | EDGAR |
| 2025-10-02 | IRDM | Grant (A) | +1,097 | $0 | EDGAR |
| 2025-07-03 | ZETA | Grant (A) | +9,907 | $0 | 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.