MPLX LP Common Units Representing Limited Partner Interests (MPLX)
MPLX moved a median of -0.01% 30 minutes after news, and -0.02% by the close. How MPLX actually reacts to news — the realized, point-in-time move the market made, measured across 299 labeled events over the last three years with zero look-ahead.
MPLX’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -0.01% | 44% | 295 |
| 30-min | -0.01% | 47% | 299 |
| 60-min | +0.01% | 51% | 299 |
| to close | -0.02% | 46% | 290 |
| Middle 50% of MPLX reactions | -0.40% to +0.33% |
|---|---|
| Median reaction (30-min) | -0.01% |
| Measured reactions | 299 |
Half of all MPLX LP Common Units Representing Limited Partner Interests news events land between -0.40% and +0.33% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How MPLX reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 16 | +0.04% | 56% | +0.02% |
| Analyst downgrades | 27 | +0.02% | 52% | +0.10% |
| Rating reiterations | 64 | +0.07% | 61% | +0.02% |
| Price-target raises | 32 | -0.04% | 38% | -0.13% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. 2 further classes were observed with fewer than 10 measured events and are not published. See how MPLX ranks against every other measured name →
That’s how MPLX usually reacts — get an email when it moves on news →Email me when MPLX moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to MPLX's baseline. Nothing else.
Recent MPLX events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| MPLX LP to Report Third-Quarter Results on November 3, 2026 | Press release | PR Newswire | -0.09% | +1.28% | |
| Form 8-K MPLX LP For: Aug 24 | SEC filing · Form 8-K | SEC EDGAR | +0.06% | -0.39% | |
| MPLX LP 2025 K-3 tax packages now available on company website | Press release | PR Newswire | +0.29% | +0.05% | |
| MPLX LP prices $2.25 billion senior notes offering | Press release | PR Newswire | +0.54% | +1.37% | |
| Form 10-Q MPLX LP For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.33% | +0.61% | |
| Form 8-K MPLX LP For: Aug 04 | SEC filing · Form 8-K | SEC EDGAR | -1.09% | +2.61% | |
| MPLX LP Reports Second-Quarter 2026 Financial Results | Press release | PR Newswire | -1.09% | +2.61% | |
| MPLX LP Announces Quarterly Distribution | Press release | PR Newswire | +0.12% | -0.32% | |
| MPLX LP to Report Second-Quarter Results on August 4, 2026 | Press release | PR Newswire | -0.67% | +0.21% | |
| Form S-3ASR MPLX LP | SEC filing · Form S-3ASR | SEC EDGAR | -0.29% | +1.66% | |
| Form 10-Q MPLX LP For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -0.14% | +0.36% | |
| Form 8-K MPLX LP For: May 05 | SEC filing · Form 8-K | SEC EDGAR | -0.76% | -2.01% | |
| MPLX LP Reports First-Quarter 2026 Financial Results | Press release | PR Newswire | -0.76% | -2.01% | |
| MPLX LP Announces Quarterly Distribution | Press release | PR Newswire | -0.01% | +0.49% | |
| Form 8-K MPLX LP For: Apr 07 | SEC filing · Form 8-K | SEC EDGAR | -0.58% | -1.42% | |
| MPLX LP to Report First-Quarter Results on May 5, 2026 | Press release | PR Newswire | +0.20% | +0.75% | |
| Form 8-K MPLX LP For: Mar 16 | SEC filing · Form 8-K | SEC EDGAR | +0.21% | +1.41% | |
| MPLX LP 2025 K-1 tax packages now available on company website | Press release | PR Newswire | +0.52% | +0.41% | |
| Form 10-K MPLX LP For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | -0.19% | -0.88% | |
| MPLX LP files 2025 Form 10-K | Press release | PR Newswire | -0.03% | -0.10% | |
| Form 8-K MPLX LP For: Feb 12 | SEC filing · Form 8-K | SEC EDGAR | +0.09% | -1.40% | |
| MPLX LP prices $1.5 billion senior notes offering | Press release | PR Newswire | -0.35% | -0.69% | |
| Form 8-K MPLX LP For: Feb 03 | SEC filing · Form 8-K | SEC EDGAR | -1.41% | -1.62% | |
| MPLX LP Reports Fourth-Quarter and Full-Year 2025 Results | Press release | PR Newswire | -1.41% | -1.62% | |
| MPLX LP Announces Quarterly Distribution | Press release | PR Newswire | +0.11% | +0.14% | |
| MPLX LP to Report Fourth-Quarter and Full-Year Financial Results on February 3, 2026 | Press release | PR Newswire | -0.25% | -2.14% | |
| Form 8-K MPLX LP For: Dec 12 | SEC filing · Form 8-K | SEC EDGAR | -0.00% | -2.08% | |
| HARVEST MIDSTREAM CLOSES $1 BILLION ROCKIES ACQUISITION FROM MPLX | Press release | PR Newswire | -0.17% | — | |
| Form 10-Q MPLX LP For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.18% | +0.39% | |
| Form 8-K MPLX LP For: Nov 04 | SEC filing · Form 8-K | SEC EDGAR | -1.38% | -0.47% | |
| Form 8-K MPLX LP For: Oct 29 | SEC filing · Form 8-K | SEC EDGAR | +0.29% | +1.14% | |
| MPLX and MARA Announce Collaboration on Integrated Power Generation and Data Center Campuses in West Texas | Press release | PR Newswire | -1.38% | -0.47% | |
| MPLX Elects Maryann T. Mannen as Chairman of the Board | Press release | PR Newswire | -1.38% | -0.47% | |
| MPLX LP Reports Third-Quarter 2025 Financial Results; Announces Increase to Quarterly Distribution of 12.5% | Press release | PR Newswire | -1.38% | -0.47% | |
| MPLX LP Increases Quarterly Distribution | Press release | PR Newswire | +0.16% | +0.27% | |
| MPLX LP 2024 K-3 tax packages now available on company website | Press release | PR Newswire | -0.08% | +0.26% | |
| MPLX LP to Report Third-Quarter Results on November 4, 2025 | Press release | PR Newswire | +0.66% | -0.68% | |
| MPLX LP Closes Northwind Midstream Acquisition | Press release | PR Newswire | +0.30% | +0.43% | |
| HARVEST MIDSTREAM ACCELERATES EXPANSION WITH $1 BILLION ACQUISITION OF MPLX UINTA AND GREEN RIVER BASIN GAS GATHERING & PROCESSING ASSETS | Press release | PR Newswire | -0.17% | -1.84% | |
| MPLX LP to Divest Rockies Gathering and Processing Assets | Press release | PR Newswire | -0.17% | -1.84% | |
| Form 8-K MPLX LP For: Aug 25 | SEC filing · Form 8-K | SEC EDGAR | -0.16% | -0.79% | |
| MPLX LP announces election of new director | Press release | PR Newswire | -0.16% | -0.79% | |
| Form 8-K MPLX LP For: Aug 11 | SEC filing · Form 8-K | SEC EDGAR | +0.07% | -0.14% | |
| MPLX LP prices $4.5 billion senior notes offering | Press release | PR Newswire | +0.35% | -0.02% | |
| Form 10-Q MPLX LP For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.04% | -0.67% | |
| Form 8-K MPLX LP For: Aug 05 | SEC filing · Form 8-K | SEC EDGAR | +0.38% | -3.12% | |
| MPLX LP Reports Second-Quarter 2025 Financial Results | Press release | PR Newswire | +0.38% | -3.12% | |
| MPLX LP to Acquire Northwind Midstream, Enhancing Permian Natural Gas and NGL Value Chains | Press release | PR Newswire | +0.02% | +0.46% | |
| MPLX LP Announces Quarterly Distribution | Press release | PR Newswire | -0.02% | — | |
| MPLX LP to Report Second-Quarter Results on August 5, 2025 | Press release | PR Newswire | +0.35% | -0.35% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the MPLX section they belong to.
Where else MPLX is measured.
MPLX earnings → · Analyst actions → · SEC filings →
Other Energy names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Matrix Service Company (MTRX) | 300 | +0.04% | 51% |
| PARAMOUNT RES LTD A (PRMRF) | 300 | 0.00% | 44% |
| ProPetro Holding Corp. (PUMP) | 298 | -0.46% | 42% |
| Helmerich & Payne, Inc. (HP) | 297 | -0.31% | 44% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Energy names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is MPLX LP Common Units Representing Limited Partner Interests's median reaction calculated?
Every labeled MPLX news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 299 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 47% of MPLX's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does MPLX's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.