[Form 4] NISOURCE INC. Insider Trading Activity

NiSource Inc. executive Michael Luhrs reported equity compensation activity and related tax withholding.

Rhea-AI Filing Summary

NiSource Inc. executive Michael Luhrs reported equity compensation activity and related tax withholding. On January 21, 2026, he acquired 6,851 Restricted Stock Units (RSUs), each representing a contingent right to receive one share of NiSource common stock. According to the award terms, these RSUs are scheduled to 100% vest on February 28, 2029, if he remains continuously employed through that date.

On January 22, 2026, 5,393 shares of common stock were withheld at $43.52 per share to satisfy tax obligations tied to the partial vesting of a 2025 special RSU award. After these transactions, Luhrs directly beneficially owned 89,564.128 shares of NiSource common stock, which includes shares acquired through the company’s Employee Stock Purchase Plan.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Luhrs Michael

Role EVP, Tech, Customer & CCO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	5,393	$43.52	$235K
Grant/Award	Common Stock	6,851	$43.79	$300K

Holdings After Transaction: Common Stock — 89,564.128 shares (Direct)

Footnotes (3)

1. F1. Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Company's common stock pursuant to the NiSource Inc. 2020 Omnibus Incentive Plan. Subject to certain forfeiture conditions, the RSUs will 100% vest on February 28, 2029, provided that the reporting person is continuously employed by the Company through and including that date.
2. F2. Number of shares reported represent shares withheld to satisfy tax withholding obligations in connection with the partial vesting of the 2025 Special Restricted Stock Unit award.
3. F3. Includes shares acquired through the NiSource Inc. Employee Stock Purchase Plan.

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Accepted by SEC EDGAR 01/23/2026 - 04:22 PM EST 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^*

Luhrs Michael

(Last) (First) (Middle)

801 E. 86TH AVENUE

(Street)

MERRILLVILLE IN 46410

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
NISOURCE INC. [ NI ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Tech, Customer & CCO

3. Date of Earliest Transaction (Month/Day/Year)
01/21/2026

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 Stock	01/21/2026		A		6,851(1)	A	$43.79	94,957.128	D
Common Stock	01/22/2026		F		5,393(2)	D	$43.52	89,564.128(3)	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:

1. Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Company's common stock pursuant to the NiSource Inc. 2020 Omnibus Incentive Plan. Subject to certain forfeiture conditions, the RSUs will 100% vest on February 28, 2029, provided that the reporting person is continuously employed by the Company through and including that date.

2. Number of shares reported represent shares withheld to satisfy tax withholding obligations in connection with the partial vesting of the 2025 Special Restricted Stock Unit award.

3. Includes shares acquired through the NiSource Inc. Employee Stock Purchase Plan.

	/s/ Ashley Bancroft, Attorney-in-Fact	01/23/2026
	** 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.