Mplx LP insider trading

Every open-market purchase and sale by Mplx LP's officers, directors and largest shareholders since November 4, 2021, and what the share price did next.

No open-market insider trades reported in the last five years.

Does following Mplx LP’s insiders pay?

From May 23, 2013 to March 11, 2025, 9 insiders reported 15 open-market purchases and 2 sales not made under a pre-set plan in Mplx LP. Twelve months after each purchase was reported, the shares were −22.3% against the S&P 500 on average (median −36.0%), over 15 purchases with a full year of prices; 13% beat the index. After sales, the shares moved −2.6% against the index over 12 months (a negative figure means selling was the right call). That rests on fewer than 20 purchases, too few to read much into. Buying each purchase the day after it was reported, an equal amount each, held 12 months or until that insider reported a sale, would have turned $10,000 on May 24, 2013 into $12,768 by November 2, 2026, +1.8% a year. It held shares 49% of the time; the S&P 500 on those same days, with Treasury bills otherwise, made $29,723 (+8.5% a year), and held throughout $57,511 (+13.9%).

Copying Mplx LP's insidersS&P 500, same days investedS&P 500, held throughout $10,000 copying every open-market purchase by Mplx LP's insiders from May 24, 2013, before costs and taxes, marked weekly. Uninvested money earns the Treasury bill rate; the portfolio held shares 49% of the time.

Mplx LP: each insider's record
Insider	Role	Purchases	12 months after their purchases	Beat the S&P 500	Sales	12 months after their sales	Latest report
Heminger Gary R.	Chairman, CEO	4	−33.3% (4)	0%	0	—	August 9, 2019
Wilson C. Richard	Director	3	+17.4% (3)	67%	0	—	September 14, 2015
Griffith Timothy T.	VP & Chief Financial Officer	2	−43.0% (2)	0%	0	—	August 31, 2015
Peiffer Garry L.	Director	2	−36.8% (2)	0%	0	—	August 13, 2019
Sandman Dan D	Director	2	−24.0% (2)	0%	0	—	August 9, 2019
Bromley C Corwin	Exec. VP and Gen Counsel	0	—	—	1	−9.8% (1)	September 15, 2017
Hagedorn Carl Kristopher	Exec VP & Chief Fin Ofc	0	—	—	1	+4.6% (1)	November 20, 2024
Lyon Shawn M	Senior VP, Log. & Storage	1	−0.7% (1)	0%	0	—	March 11, 2025
Templin Donald C.	Executive VP	1	−44.6% (1)	0%	0	—	August 21, 2015

Moves are the shares’ return including dividends minus the S&P 500’s, from the close on the first trading day after each report; the number of trades with a finished 12-month window is in brackets. Green means the trade went the insider’s way (a purchase ahead of the index, a sale followed by the shares trailing it). A trade reported both by a director or officer and by a fund or company they are linked to counts once here, under the person. Purchases count only where the share price actually traded was at least $5. These figures describe what the shares did, not why anyone traded. Insiders across all companies.

When several insiders traded Mplx LP

Months when 2 or more insiders became net buyers, or 3 or more net sellers, of Mplx LP in reports dated in the 91 days before the month end, and how the stock did against the S&P 500 from that month end. After the 2 buying crowds with six months of prices, it averaged −37.6% against the index. One company's history is too short to judge by; the test across every company is the better guide.

Month	Crowd	3 months on, vs S&P 500	6 months	12 months
August 30, 2019	3 buying	−21.0%	−29.4%	−47.1%
August 31, 2015	3 buying	−18.5%	−45.8%	−40.5%

Colours show whether the crowd was right: green when buyers were followed by a rise above the index, or sellers by a fall below it. Total returns from the month end; past patterns are not a forecast.

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