WILLIAM JOHN SEMPOLINSKI

Position in MPLX — Mplx LP

CIK 2149024 EASTON, MA

Position in MPLX

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$298,605

-$17,505 QoQ

Shares Held

5,301

-4.3% QoQ

Ownership

0.001%

of shares outstanding

% of Portfolio

0.19%

of 13F equity value

Holder Rank

#443

of 630 holders

Holding Since

Dec 2025

3 quarters on record

Voting authority Sole 0% Shared 0% None 100%

Energy · as of Jun 30, 2026

WILLIAM JOHN SEMPOLINSKI holds $1,619,522 across 3 Oil & Gas Midstream names. MPLX ranks #3 (18.4% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	KMI	Kinder Morgan, Inc.	28,600	$914,342
2	ENB	Enbridge Inc	7,500	$406,575
3	MPLX	Mplx LP This page	5,301	$298,605

3 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$298,605	5,301	-4.3%	Shares	Sole	2026-08-14
2026-03-31	$316,110	5,539	+14.5%	Shares	Sole	2026-08-26
2025-12-31	$258,257	4,839	—	Shares	Sole	2026-08-26
No filing history on record for this holder in this stock.