MPLX CFO reports unit grant and tax dispositions

MPLX LP executive vice president and chief financial officer Carl Kristopher Hagedorn reported both an equity award and related tax-withholding transactions in common units.

Rhea-AI Filing Summary

MPLX LP executive vice president and chief financial officer Carl Kristopher Hagedorn reported both an equity award and related tax-withholding transactions in common units. On March 1, 2026, he acquired 4,930 common units as a grant at $0.00 per unit. On March 2, 2026, he disposed of 422, 916, and 663 common units at $59.22 per unit in tax-withholding dispositions. Following these transactions, his direct holdings were reported at 20,409 common units.

Insider Trade Summary

4 transactions reported

Mixed 4 txns

Insider HAGEDORN CARL KRISTOPHER

Role Exec VP & Chief Fin Ofc

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Units (Limited Partner Interests)	422	$59.22	$25K
Exercise Price or Tax Liability	Common Units (Limited Partner Interests)	916	$59.22	$54K
Exercise Price or Tax Liability	Common Units (Limited Partner Interests)	663	$59.22	$39K
Grant/Award	Common Units (Limited Partner Interests)	4,930	$0.00	$0.00

Holdings After Transaction: Common Units (Limited Partner Interests) — 20,409 shares (Direct)

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions did MPLX (MPLX) report for Carl Kristopher Hagedorn?

MPLX reported that Carl Kristopher Hagedorn received a grant of 4,930 common units and executed several tax-withholding dispositions. These involved delivering units to cover tax liabilities tied to equity compensation, rather than open-market purchases or sales.

How many MPLX common units were granted to the CFO in this Form 4 filing?

The filing shows a grant of 4,930 MPLX common units to the executive vice president and chief financial officer. The units were recorded at a price of $0.00 per unit, indicating an equity award rather than a purchase on the open market.

What type of dispositions did the MPLX CFO report on March 2, 2026?

On March 2, 2026, the CFO reported tax-withholding dispositions of MPLX common units. These Form 4 transactions used code F, meaning units were delivered to satisfy tax liabilities associated with equity awards, not ordinary open-market selling activity.

At what price were the MPLX tax-withholding units valued in the Form 4?

Each tax-withholding disposition of MPLX common units was valued at $59.22 per unit. This price was applied to multiple Form 4 transactions coded F, which represent the delivery of units to cover exercise price or tax obligations on equity compensation.

What were Carl Kristopher Hagedorn’s MPLX holdings after the reported transactions?

After the reported grant and tax-withholding dispositions, the Form 4 lists Carl Kristopher Hagedorn with direct ownership of 20,409 MPLX common units. This figure reflects his holdings following the final March 2, 2026 tax-withholding disposition transaction.

Does the MPLX Form 4 indicate direct or indirect ownership for these units?

The Form 4 identifies all reported MPLX common unit transactions as direct ownership, coded D for ownership type. No separate entity or indirect holding structure is referenced, and the nature of ownership field contains no additional descriptive footnotes.

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Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 03/03/2026 - 07:27 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

HAGEDORN CARL KRISTOPHER

(Last) (First) (Middle)

C/O MPLX LP

200 E. HARDIN STREET

(Street)

FINDLAY OH 45840

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MPLX LP [ MPLX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Exec VP & Chief Fin Ofc

3. Date of Earliest Transaction (Month/Day/Year)
03/01/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Units (Limited Partner Interests)	03/01/2026		A		4,930	A	$0	22,410	D
Common Units (Limited Partner Interests)	03/02/2026		F		422	D	$59.22	21,988	D
Common Units (Limited Partner Interests)	03/02/2026		F		916	D	$59.22	21,072	D
Common Units (Limited Partner Interests)	03/02/2026		F		663	D	$59.22	20,409	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

The Reporting Person is a Director and Executive Vice President and Chief Financial Officer of MPLX GP LLC, the general partner of the Issuer. The Issuer is managed by the directors and executive officers of MPLX GP LLC.

	/s/ Molly R. Benson, Attorney-in-Fact for Carl Kristopher Hagedorn	03/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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