What Latest 13F Filers Reveal About Marathon Petroleum Positions

Recent analysis of 13F filings shows an intriguing pattern: among the 26 most recent institutional filers submitting financial disclosures for the period ending 12/31/2025, Marathon Petroleum Corp. (MPC) appeared in the portfolios of 11 of these funds. This clustering of interest among sophisticated investors warrants closer examination, though it’s crucial to understand what these filings actually reveal—and what they don’t.

Understanding The Limitations Of Filers’ Disclosures

Before drawing conclusions from what institutional filers hold, an important caveat: 13F filings only capture long positions. The complete picture remains hidden because filers aren’t required to disclose short positions or hedging strategies. A fund might simultaneously short calls on a stock while holding shares for tactical trading, appearing bullish in their 13F filing while maintaining an overall bearish stance. However, when examining groups of filers across different reporting periods, these limitations become less significant. Comparing aggregate positions across multiple filers from one quarter to the next can reveal meaningful trends that individual filings might obscure.

How The Latest Filers Are Adjusting MPC Stakes

Among the 11 recent filers holding MPC, the changes between 09/30/2025 and 12/31/2025 tell an interesting story. Two funds established entirely new MPC positions—Souders Financial Advisors added 3,184 shares worth $518,000, and AlphaStar Capital Management added 1,765 shares valued at $287,000. For existing positions, the picture was mixed: four filers increased their holdings while three reduced them.

Notable moves included Woodard & Co. Asset Management boosting its position by 1,412 shares, though the market value declined slightly by $188,000 due to price fluctuations. Conversely, CENTRAL TRUST Co trimmed 563 shares from its holdings, representing an $888,000 reduction in market value. Some filers made minimal adjustments—Sachetta LLC added just 2 shares while Breakwater Investment Management and Pittenger & Anderson Inc. kept their positions unchanged.

Aggregate Hedge Fund Activity Shows Growing Interest

Looking beyond these individual filers to examine the broader trend, the data becomes more revealing. Taking all filers from the latest batch that held MPC on 12/31/2025, we compared their combined share count to the same funds’ holdings three months earlier on 09/30/2025. Across this entire universe of 2,930 filers analyzed, those holding MPC collectively increased their positions by 342,169 shares—growing from 50,405,794 shares to 50,747,963 shares, representing approximately 0.68% growth.

This aggregate increase suggests coordinated confidence among institutional filers, even as individual movements varied. When multiple sophisticated investors simultaneously build positions, it often signals deeper research or conviction about a stock’s fundamentals.

Who’s Accumulating The Most MPC

The top institutional filers dominating MPC ownership paint a picture of establishment investor interest. As of 12/31/2025:

1. Vanguard Group Inc. held the most significant position at 38,291,917 shares
2. US Bancorp DE maintained 1,607,011 shares
3. UBS Group AG owned 1,268,871 shares

Beyond these three major filers, numerous other institutional investors round out the top 10, collectively representing enormous pools of capital focused on this energy sector play.

What The Filers’ Actions Signal

The convergence of behavior among recent filers filing their latest positions suggests Marathon Petroleum has attracted systematic institutional attention. While any individual filer’s position shift could result from routine portfolio rebalancing, algorithm adjustments, or tactical trades, the collective movement across dozens of sophisticated investors points toward something more substantial. Whether this reflects changing perceptions of energy sector valuations, MPC’s operational performance, or broader macroeconomic positioning remains a question worth exploring further—particularly for investors doing their own fundamental research into Marathon Petroleum and the energy sector.