Stock

MPLX

MPLX LP

Latest close $552 of 27 marquee funds currently hold1 CUSIP mapped

Current holders

27 funds tracked

Ever held

Current + past

New this quarter

Exited this quarter

Marquee-fund ownership over time

Feb 16, 2021Aug 14, 2024Nov 14, 2025Feb 17, 2026

Now

Current holders

Sorted by tenure (longest first)

Fund	First disclosed	Held	Entry price	Latest close	Return on entry
Appaloosa	Q1 2021	22Q	$16	$55	+254%
Citadel Advisors re-entered	Q3 2024(8Q snapshot)	7Q	$36	$55	+54%

“Return on entry” is the price-only move from the fund's first disclosure to today — it ignores any adds, trims, or dividends. A fund that built its position over multiple quarters has a true cost basis somewhere between entry price and latest close; this figure is the upper bound.

Insider activity

Form 4 — officers, directors, 10%+ owners

Filed within two business days of each transaction by anyone with material insider status at MPLX LP. Pair with the holders table above as a sanity check: heavy insider buying alongside marquee-fund accumulation is the strongest accumulation signal; heavy insider selling alongside fund exits is the strongest distribution signal.

Filings · last 30d

Filings · last 90d

Total on file

720

Recent SEC buffer

Most recent

May 19, 2026

30d / 90d windows measured from May 19, 2026 — the most recent Form 4 on file — not from today.

Showing 15 of 720 recent Form 4 filings. Browse all on EDGAR ↗

Fundamentals

XBRL · MPLX LP

Annual figures sourced directly from MPLX LP's 10-K / 10-Q filings via SEC EDGAR XBRL. Latest fiscal year and the year-over-year change, with up to ten years of history.

Revenue

$13B

FY2025+9% YoY

Net income

$3.93B

FY2023-0% YoY

Free cash flow(?)

$4.1B

FY2025-16% YoY

Recent SEC filings

10-K · 10-Q · 8-K · 13D/G · proxy

The most recent material filings for MPLX LP — earnings, material events, ownership disclosures, proxy statements. Form 4 insider activity is shown in the panel above.

Trade history

Every open→close lifecycle across tracked funds

Fund	Open date	Close date	Open price	Close price / current	Return
Citadel Advisors	Q1 2026	open	$56	$55	-1%
Citadel Advisors	Q3 2024	Q4 2025	$36	$51	+42%
Appaloosa	Q1 2021	open	$16	$55	+254%

Caveats

Covers only the 27 marquee funds tracked here, not the full institutional universe. A “0 holders” reading does not mean unowned.
Heavy funds (Renaissance Technologies, Citadel Advisors, Soros Fund Management, Two Sigma Investments, D.E. Shaw, AQR Capital Management, Millennium Management, Point72 Asset Management) use 8-quarter snapshots, so their pre-2024 history is missing.
“Current” reflects each fund's most recent 13F — filings lag the actual trade by up to 45 days; positions shown may have changed since.
Cost = price at the entry filing date. Re-entered positions show the most recent open lot.
Options, ADRs, and unmapped CUSIPs are excluded from the follower-backtest pipeline that produces these snapshots, so certain holding types won't appear here.