John C Mollenkopf
CIK 1235082 · Exec VP and COO · last filed 2026-10-13
John C Mollenkopf is an Exec VP and COO who has filed 71 SEC Form 4 insider transactions across 4 companies since 2007. The most recent filing, for AM, was dated Oct 13, 2026. Across all open-market trades the lifetime net is −$3.8M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $27.2M across reported positions.
"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.
MWE 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
TOWER 2, SUITE 700
DENVER, CO 80202
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| AM | Director | 108,581 | $21.47 | $2.33M | $0 | 37 | 2026-10-13 |
| MPLX | Exec VP and COO | 413,452 | $60.16 | $24.87M | $0 | 2 | 2015-12-22 |
| MARKWEST ENERGY PARTNERS L P (MWE) Delisted | EVP, Chief Operating Officer | 270,444 | — | — | -$3.78M | 27 | 2015-12-03 |
| MARKWEST HYDROCARBON INC (MWP) Delisted | SVP, Chief Operations Officer | 5,267 | — | — | $0 | 2 | 2008-01-04 |
Recent Filings
71 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-10-13 | AM | Grant (A) | +2,015 | $0 | EDGAR |
| 2026-07-14 | AM | Grant (A) | +1,907 | $0 | EDGAR |
| 2026-04-14 | AM | Grant (A) | +1,617 | $0 | EDGAR |
| 2026-01-12 | AM | Grant (A) | +2,058 | $0 | EDGAR |
| 2025-10-14 | AM | Grant (A) | +1,935 | $0 | EDGAR |
| 2025-07-14 | AM | Grant (A) | +2,042 | $0 | EDGAR |
| 2025-04-14 | AM | Grant (A) | +2,243 | $0 | EDGAR |
| 2025-01-13 | AM | Grant (A) | +2,302 | $0 | EDGAR |
| 2024-10-15 | AM | Grant (A) | +2,308 | $0 | EDGAR |
| 2024-07-11 | AM | Grant (A) | +2,415 | $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.