Latest filingAug 18, 2026Most recent Form 4
MPLX
MPLX LP
NYSEIndustrialsPipe Lines (No Natural Gas)
Insider activity for last month from 08/03 to 09/03. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$00 sells
Net open-market+$07 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period7transactions
- A · Grants / awards · dominant7 · 100%
Activity by reported role
A joint filing can contribute to multiple roles7transactions
- Director · dominant7 · 100%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (7)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeBreves Christine SCommon Units (Limited Partner Interests) · Direct
15,038.282Aug 14, 2026
Helms Christopher ACommon Units (Limited Partner Interests) · Direct
86,208.397Aug 14, 2026
Semple Frank MCommon Units (Limited Partner Interests) · Direct
63,475.958Aug 14, 2026
Stice J MichaelCommon Units (Limited Partner Interests) · Direct
58,412.913Aug 14, 2026
Surma John PCommon Units (Limited Partner Interests) · Direct
95,447.777Aug 14, 2026
Walker Ray N JRCommon Units (Limited Partner Interests) · Direct
4,609.294Aug 14, 2026
Peiffer Garry L.Common Units (Limited Partner Interests) · Direct
69,313.23Aug 14, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 03 → Sep 03
LessMore
Top insiders
By absolute net value across the selected period- PL+$0
- WJ+$0
- SP+$0
- SM+$0
- SM+$0
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
MPLX transaction history
Filters apply within this company and selected period by default| Ticker | Insider | Role | Type | Shares | Value | Code | Signals | 90d return | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|---|
| MPLX | Peiffer Garry L. | DIR | grant | 1.23k | $0 | A | −0.5% | 08/18 | 08/14 | |
| MPLX | Walker Ray N JR | DIR | grant | 82 | $0 | A | −0.5% | 08/18 | 08/14 | |
| MPLX | SURMA JOHN P | DIR | grant | 1.56k | $0 | A | −0.5% | 08/18 | 08/14 | |
| MPLX | STICE J MICHAEL | DIR | grant | 983 | $0 | A | −0.5% | 08/18 | 08/14 | |
| MPLX | SEMPLE FRANK M | DIR | grant | 1.07k | $0 | A | −0.5% | 08/18 | 08/14 | |
| MPLX | HELMS CHRISTOPHER A | DIR | grant | 1.33k | $0 | A | −0.5% | 08/18 | 08/14 | |
| MPLX | Breves Christine S | DIR | grant | 219 | $0 | A | −0.5% | 08/18 | 08/14 |
MPLX LP Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at MPLX LP?
Peiffer Garry L., Walker Ray N JR, SURMA JOHN P, STICE J MICHAEL, SEMPLE FRANK M, HELMS CHRISTOPHER A, Breves Christine S.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
No code-S sale is available for this period.
What is the recent purchase and sale balance?
No code-P purchases or code-S sales were reported in the selected period.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.