Infinity Natural (INR) CAO RSUs vest, tax shares withheld in Form 4

Rhea-AI Filing Summary

Infinity Natural Resources Chief Accounting Officer Brian P. Pietrandrea had 3,362 restricted stock units vest and convert into Class A common stock on March 17, 2026. These RSUs were part of a 10,086-unit grant awarded on July 16, 2025 that vests in three equal annual installments.

To cover taxes on the vesting, 934 shares of common stock were withheld at a reference price of $18.15 per share, leaving Pietrandrea with 2,428 shares of Class A common stock directly owned after the transactions. Following the conversion, 6,724 RSUs remain outstanding from the original grant.

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

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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^*

Pietrandrea Brian P.

(Last) (First) (Middle)

C/O INFINITY NATURAL RESOURCES, INC.

2605 CRANBERRY SQUARE

(Street)

MORGANTOWN WEST VIRGINIA 26508

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
INFINITY NATURAL RESOURCES, INC. [ INR ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Accounting Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/17/2026

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

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

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

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
Class A Common Stock	03/17/2026		M		3,362(1)	A	(2)	3,362	D
Class A Common Stock	03/17/2026		F		934(3)	D	$18.15	2,428	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
Restricted Stock Units (2025)	(2)	03/17/2026		M			3,362	(4)	(4)	Class A Common Stock	3,362	$0	6,724	D

Explanation of Responses:

1. Reflects shares of Class A common stock, $0.01 par value per share (the "Common Stock"), of the Issuer delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

2. Each RSU represents the contingent right to receive one share of Common Stock.

3. Reflects shares of Common Stock withheld to satisfy taxes payable in connection with the vesting and settlement of previously awarded RSUs.

4. On July16, 2025, the Reporting Person was granted 10,086 RSUs, which vest in three equal installments on March 17 of each of 2026, 2027 and 2028.

	/s/ Raleigh Wolfe, as Attorney-in-Fact for the Reporting Person	03/19/2026
	** 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.
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 4: SEC 1474 (03-26)

FAQ

What did INR Chief Accounting Officer Brian Pietrandrea report on this Form 4?

Brian Pietrandrea reported the vesting of 3,362 restricted stock units into Class A common stock. The filing also shows related tax share withholding and his resulting direct ownership in Infinity Natural Resources shares after these compensation-related transactions.

How many Infinity Natural Resources RSUs vested for INR CAO Brian Pietrandrea?

A total of 3,362 restricted stock units vested and settled into Class A common stock. These units are one of three equal installments from a 10,086-unit grant that vests annually in 2026, 2027, and 2028, subject to continued service.

Were any Infinity Natural Resources shares sold on the market in this Form 4?

No open-market sale is reported. Instead, 934 shares of Class A common stock were withheld at $18.15 per share solely to satisfy taxes due on the RSU vesting, a standard non-discretionary tax withholding transaction for equity compensation.

How many Infinity Natural Resources shares does Brian Pietrandrea hold after these transactions?

After the RSU vesting and tax withholding, Pietrandrea directly owns 2,428 shares of Class A common stock. He also retains 6,724 unvested RSUs from the original 10,086-unit grant, which are scheduled to vest in equal portions in future years.

What is the vesting schedule of Brian Pietrandrea’s Infinity Natural Resources RSUs?

The 10,086 restricted stock units were granted on July 16, 2025 and vest in three equal installments. One-third, or 3,362 RSUs, vests on March 17 of each year in 2026, 2027, and 2028, aligning ongoing equity compensation with continued employment.

Is this INR Form 4 transaction a routine compensation event?

Yes, the Form 4 reflects routine equity compensation activity: RSUs vesting and converting into common stock, with a portion of shares withheld to pay taxes. No discretionary open-market purchases or sales by the Chief Accounting Officer are disclosed here.