As of the latest Form 4 filed May 4, 2026.
What MPLX LP insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Newest filing first — the 11 most recent filings for MPLX.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-05-04 | 2026-04-30 | Walker Ray N JR Director | AAward | +2.25K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-04 | 2026-04-30 | SURMA JOHN P Director | AAward | +2.58K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-04 | 2026-04-30 | STICE J MICHAEL Director | AAward | +2.58K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-04 | 2026-04-30 | SEMPLE FRANK M Director | AAward | +2.58K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-04 | 2026-04-30 | Peiffer Garry L. Director | AAward | +2.25K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-04 | 2026-04-30 | HELMS CHRISTOPHER A Director | AAward | +2.25K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-04 | 2026-04-30 | Breves Christine S Director | AAward | +2.25K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2025-12-16 | 2025-12-12 | Lyon Shawn M Senior VP, Log. & Storage | FTax | −245.00 | $54.85 | $13.4K | No | Form 4 ↗ |
| 2025-12-16 | 2025-12-12 | Hennigan Michael J Executive Chairman | FTax | −1.33K | $54.85 | $73.2K | No | Form 4 ↗ |
| 2025-12-16 | 2025-12-12 | Floerke Gregory Scott Exec. VP and COO | FTax | −242.00 | $54.85 | $13.3K | No | Form 4 ↗ |
| 2025-12-16 | 2025-12-12 | Benson Molly R Chief Legal Ofc & Corp Sec | FTax | −306.00 | $54.85 | $16.8K | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also MPLX’s full analysis or the market-wide insider trading feed. The tabs above jump to MPLX’s other SEC data.
Source: SEC Form 4 filings for MPLX, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
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