T. Rowe Price Investment Management (NI) discloses 6.2% beneficial stake in NiSource

Rhea-AI Filing Summary

T. Rowe Price Investment Management, Inc. reports beneficial ownership of NiSource Inc. common stock on an amended Schedule 13G. The firm reports beneficial ownership of 29,893,604 shares of NiSource common stock, representing 6.2% of the class. It has sole power to vote 27,978,901 shares and sole power to dispose of 29,893,604 shares, with no shared voting or dispositive power. T. Rowe Price Investment Management states that this filing should not be construed as an admission that it is the beneficial owner of these securities, and it expressly denies such beneficial ownership.

Key Figures

Shares beneficially owned: 29,893,604 shares Percent of class: 6.2% Sole voting power: 27,978,901 shares +3 more

6 metrics

Shares beneficially owned 29,893,604 shares Amount beneficially owned in NiSource Inc. common stock

Percent of class 6.2% Percent of NiSource Inc. common stock class reported as beneficially owned

Sole voting power 27,978,901 shares Shares for which T. Rowe Price Investment Management has sole power to vote

Shared voting power 0 shares Shares with shared power to vote or direct the vote

Sole dispositive power 29,893,604 shares Shares for which T. Rowe Price Investment Management has sole power to dispose

Shared dispositive power 0 shares Shares with shared power to dispose or direct the disposition

Key Terms

beneficially owned, sole power to vote, sole power to dispose, Schedule 13G/A, +1 more

5 terms

beneficially owned financial

"Amount beneficially owned: 29893604"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole power to vote financial

"Sole power to vote or to direct the vote: 27978901"

sole power to dispose financial

"Sole power to dispose or to direct the disposition of: 29893604"

Schedule 13G/A regulatory

"form_type: "SCHEDULE 13G/A""

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

percent of class financial

"Percent of class: 6.2 %"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

FAQ

What percentage of NiSource Inc. (NI) does T. Rowe Price Investment Management report owning?

T. Rowe Price Investment Management reports 6.2% beneficial ownership of NiSource Inc. common stock. This corresponds to 29,893,604 shares as disclosed in its amended Schedule 13G filing.

How many NiSource Inc. (NI) shares does T. Rowe Price Investment Management say it can vote?

T. Rowe Price Investment Management reports sole power to vote or direct the vote of 27,978,901 NiSource Inc. shares. It reports 0 shares with shared voting power in this Schedule 13G/A.

What is the total number of NiSource Inc. (NI) shares T. Rowe Price Investment Management can dispose of?

The firm reports sole power to dispose of or direct the disposition of 29,893,604 NiSource Inc. common shares. It reports 0 shares with shared dispositive power in the ownership disclosure.

What type of filing did T. Rowe Price Investment Management submit for NiSource Inc. (NI)?

T. Rowe Price Investment Management submitted an amended Schedule 13G/A regarding NiSource Inc. common stock. This filing type reports passive beneficial ownership above certain regulatory thresholds.

Does T. Rowe Price Investment Management admit beneficial ownership of NiSource Inc. (NI) shares?

No. The firm states that this filing shall not be construed as an admission that it is the beneficial owner of the NiSource securities and expressly denies such beneficial ownership.

Who signed the NiSource Inc. (NI) Schedule 13G/A for T. Rowe Price Investment Management?

The filing is signed by Ellen York, Vice President of T. Rowe Price Investment Management, Inc., dated 08/14/2026, certifying the accuracy of the ownership information reported.

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Available on EDGAR 08/14/2026 - 10:41 AM Accepted by SEC EDGAR 08/14/2026 - 10:39 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

NISOURCE INC

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

65473P105

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 65473P105

1

Names of Reporting Persons

T. Rowe Price Investment Management, Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

MARYLAND

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 27,978,901.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 29,893,604.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

29,893,604.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.2 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: NISOURCE INC
(b)	Address of issuer's principal executive offices: 801 EAST 86TH AVE, MERRILLVILLE, IN, 46410-6272
Item 2.
(a)	Name of person filing: T. Rowe Price Investment Management, Inc.
(b)	Address or principal business office or, if none, residence: 1307 Point Street, Baltimore, MD 21231
(c)	Citizenship: Maryland
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP No.: 65473P105
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 29893604
(b)	Percent of class: 6.2 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 27978901
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 29893604
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. T. Rowe Price Investment Management, Inc. hereby declares and affirms that the filing of Schedule 13G shall not be construed as an admission that Price Investment Management is the beneficial owner of the securities referred to, which beneficial ownership is expressly denied.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

T. Rowe Price Investment Management, Inc.

Signature:	Ellen York
Name/Title:	Vice President
Date:	08/14/2026