MPLX VP Brzezinski reports holding 4,733 units

MPLX LP officer Erin M. Brzezinski, VP and Controller, reported her ownership of the partnership’s common units.

Accepted by SEC EDGAR 04/02/2026 - 04:35 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

MPLX LP officer Erin M. Brzezinski, VP and Controller, reported her ownership of the partnership’s common units. The filing shows she holds 4,733 Common Units (Limited Partner Interests) directly. The entry is categorized as a holding, with no reported purchases, sales, or derivative positions.

Insider Trade Summary

Holdings reported, no transactions

Holdings

Insider Brzezinski Erin M

Role VP and Controller

Type	Security	Shares	Price	Value
Holding	Common Units (Limited Partner Interests)	--	--	--

Holdings: Common Units (Limited Partner Interests) — 4,733 shares (Direct)

Key Figures

Common units held: 4,733 units

1 metrics

Common units held 4,733 units Total Common Units (Limited Partner Interests) directly owned after reported holding

Key Terms

Common Units (Limited Partner Interests), Form 3, VP and Controller

3 terms

Common Units (Limited Partner Interests) financial

"security_title: Common Units (Limited Partner Interests)"

Form 3 regulatory

"INSIDER FILING DATA (Form 3)"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

VP and Controller financial

"officer_title: VP and Controller"

FAQ

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

What does the MPLX Form 3 filing by Erin M. Brzezinski report?

The MPLX Form 3 filing reports that officer Erin M. Brzezinski holds common units of MPLX LP. It lists her position as VP and Controller and discloses her direct ownership of 4,733 Common Units (Limited Partner Interests) as a holding, with no buy or sell activity.

How many MPLX common units does Erin M. Brzezinski hold?

Erin M. Brzezinski holds 4,733 MPLX Common Units (Limited Partner Interests). The Form 3 filing shows these units as directly owned, with the total_shares_following_transaction field indicating 4,733.0000 units, and no associated transaction price or trade volume reported.

Does the MPLX Form 3 for Erin M. Brzezinski show any insider trades?

The MPLX Form 3 does not show any insider trades for Erin M. Brzezinski. The transaction is categorized as a holding entry, with zero buy, sell, exercise, gift, or tax-withholding counts, indicating only a disclosure of existing ownership rather than new trading activity.

What is Erin M. Brzezinski’s role at MPLX LP in this Form 3?

In this Form 3, Erin M. Brzezinski is identified as an officer of MPLX LP, serving as VP and Controller. The filing links this officer role to her direct ownership of 4,733 Common Units, clarifying that these units are held in her capacity as a company insider.

Are any derivative securities reported in Erin M. Brzezinski’s MPLX Form 3?

No derivative securities are reported in Erin M. Brzezinski’s MPLX Form 3. The derivativeSummary section is empty and derivativeTransactionCount is zero, indicating there are no options, warrants, or other derivative positions disclosed in this particular insider ownership filing.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Brzezinski Erin M

(Last) (First) (Middle)

C/O MPLX LP

200 E. HARDIN STREET

(Street)

FINDLAY OHIO 45840

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
04/01/2026

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

3a. Foreign Trading Symbol

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	VP and Controller

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Units (Limited Partner Interests)	4,733	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit List: Exhibit 24 Power of Attorney; The Reporting Person is the Vice President and Controller 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 Erin M. Brzezinski	04/02/2026
	** 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 5 (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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)