NiSource officer proposes $1.78M share sale

Fidelity Brokerage Services LLC is identified as broker, with October 30, 2026, listed as the approximate sale date.

Available on EDGAR 10/30/2026 - 12:30 PM EDT Accepted by SEC EDGAR 10/30/2026 - 12:29 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

NiSource Inc. officer William Jefferson Jr. reported a proposed sale of 40,000 common shares, with an aggregate market value of $1,782,400.00. The notice gives October 30, 2026, as the approximate sale date and identifies Fidelity Brokerage Services LLC as broker. The acquisition table lists 382 common shares from restricted stock vesting on February 28, 2025, and 39,618 on February 27, 2026.

Key Figures

Common shares proposed for sale: 40,000 shares Aggregate market value: $1,782,400.00 Shares from restricted stock vesting: 382 shares +1 more

4 metrics

Common shares proposed for sale 40,000 shares Approximate sale date: October 30, 2026

Aggregate market value $1,782,400.00 Proposed sale

Shares from restricted stock vesting 382 shares February 28, 2025

Shares from restricted stock vesting 39,618 shares February 27, 2026

Key Terms

Rule 144, Restricted Stock Vesting, aggregate market value

3 terms

Rule 144 regulatory

"definition of "person" in paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Vesting technical

"Restricted Stock Vesting | Issuer"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

aggregate market value financial

"Aggregate market value"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

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

How many NI shares is William Jefferson Jr. proposing to sell?

The notice lists a proposed sale of 40,000 common shares with an aggregate market value of $1,782,400.00 and an approximate sale date of October 30, 2026.

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

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001935312
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	NISOURCE INC.
SEC File Number	001-16189
Address of Issuer	801 EAST 86TH AVE MERRILLVILLE INDIANA 46410-6272
Phone	2196475200
Name of Person for Whose Account the Securities are To Be Sold	Jefferson William Jr.
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	40000	1782400.00	479668642	10/30/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	02/28/2025	Restricted Stock Vesting	Issuer			382	02/28/2025	Compensation
Common	02/27/2026	Restricted Stock Vesting	Issuer			39618	02/27/2026	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	10/30/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for William Jefferson Jr
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)