Question 1

Which hedge funds and institutional investors hold MPLX?

Accepted Answer

StonkWhisper tracks 13F filings submitted to the SEC by institutional investment managers with over $100 million in assets. The whale tracker for MPLX shows which major funds hold positions, their portfolio weight, share counts, and how those positions changed quarter over quarter.

Question 2

What does conviction level mean for MPLX whale holdings?

Accepted Answer

Conviction level reflects how significant MPLX is within a fund's overall portfolio. A high-conviction position means the manager has allocated a large percentage of their portfolio to MPLX, suggesting strong directional confidence in the stock.

Question 3

How current is the whale data for MPLX?

Accepted Answer

Institutional 13F filings are required within 45 days of each calendar quarter end (March 31, June 30, September 30, December 31). StonkWhisper processes filings as they are published on SEC EDGAR, so data reflects the most recently reported quarter.

Question 4

What do quarter-over-quarter changes tell me about MPLX?

Accepted Answer

QoQ changes for MPLX show whether institutional managers are increasing, decreasing, initiating, or exiting their positions. New positions and significant increases can signal growing institutional conviction, while exits or decreases may indicate waning confidence.

Manager	Shares	Value	% of Portfolio	Manager AUM
Fidelity (FMR)	3.4M	$191.8M	0.0%	$1898.4B
Brave Warrior	3.3M	$185.7M	4.6%	$4.0B
ClearBridge	2.3M	$133.8M	0.1%	$114.9B
Jennison	545.1K	$31.1M	0.0%	$145.4B
Appaloosa	502.5K	$28.7M	0.5%	$5.9B
Epoch	429.6K	$24.5M	0.1%	$16.5B
Citadel	394.6K	$22.5M	0.0%	$618.5B
Citadel	88.2K	$5.0M	0.0%	$618.5B
BlackRock	49.1K	$2.8M	—	$5723.5B
Neuberger Berman (Eisman)	8.9K	$508K	0.0%	$131.4B
Citadel	5.2K	$299K	—	$618.5B
Northern Trust	3.8K	$214K	—	$756.6B
Acadian	27.5K	$2K	0.0%	$70.5M

MPLX

Who Holds MPLX

Changes This Quarter