Corbin J Robertson Jr
CIK 1194888 · Chairman and CEO · last filed 2026-09-17
Corbin J Robertson Jr is a Chairman and CEO who has filed 84 SEC Form 4 insider transactions across 4 companies since 2007. The most recent filing shows the insider exercised options covering $57.7K of KLXE on Sep 17, 2026. Across all open-market trades the lifetime net is +$36.0K, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $117.5M across reported positions. 9 SEC filings were submitted jointly with QEP Management Co GP LLC.
"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.
NRP 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
HOUSTON, TX 77002
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| KLXE | Director | 332,013 | $1.11 | $368.5K | -$4.47M | 19 | 2026-09-17 |
| NRP | Chairman and CEO | 798,976 | $115.62 | $92.38M | $4.51M | 43 | 2026-02-12 |
| Quintana Maritime LTD (QMARW) Delisted | Director | 5,120,616 | — | — | $0 | 2 | 2007-12-27 |
| NSP | Chairman and CEO | 508,168 | $48.68 | $24.74M | $0 | 5 | 2007-04-04 |
Recent Filings
84 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-09-17 | KLXE | Exer (M) | +38,694 | $57.7K | EDGAR |
| 2026-09-15 | KLXE | Exer (M) | +225,353 | $335.8K | EDGAR |
| 2026-02-12 | NRP | Mixed | +44,183 | -$3.53M | EDGAR |
| 2026-02-06 | NRP | Grant (A) | — | $0 | EDGAR |
| 2026-02-02 | KLXE | Grant (A) | +14,481 | $0 | EDGAR |
| 2026-01-05 | NRP | Other (J) | −794 | $0 | EDGAR |
| 2025-02-12 | NRP | Mixed | +35,207 | -$2.35M | EDGAR |
| 2025-02-06 | NRP | Grant (A) | — | $0 | EDGAR |
| 2025-02-04 | KLXE | Grant (A) | +5,658 | $0 | EDGAR |
| 2024-02-20 | NRP | Mixed | +44,595 | -$2.51M | 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.