NI Nisource Inc

The Notes will bear interest (i) from and including September 9, 2024 to, but excluding, March 31, 2035 (the “First Reset Date”) at the rate of 6.375% per annum and (ii) from and including the First Reset Date, during each Reset Period (as defined in the Preliminary Prospectus Supplement) at a rate per annum equal to the Five-year U.S. Treasury Rate (as defined in the Preliminary Prospectus Supplement) as of the most recent Reset Interest Determination Date (as defined in the Preliminary Prospectus Supplement) plus a spread of 2.527%, to be reset on each Reset Date (as defined in the Preliminary Prospectus Supplement).

For additional information and the definitions of the terms Reset Period, Five-year U.S. Treasury Rate, Reset Interest Determination Date and Reset Date, see “Supplemental Description of the Notes—Maturity, Interest and Payment” in the Preliminary Prospectus Supplement.

extend beyond the final maturity date of the Notes) and to shorten the length of any Optional Deferral Period. The Issuer cannot begin a new Optional Deferral Period until the Issuer has paid all accrued and unpaid interest on the Notes from any previous Optional Deferral Period.

For additional information and the definitions of the terms event of default, Optional Deferral Period and Interest Payment Period, see “Supplemental Description of the Notes—Events of Default” and “Description of the Notes—Option to Defer Interest Payments” in the Preliminary Prospectus Supplement.

The Issuer may redeem some or all of the Notes, at its option, in whole or in part (i) on any day in the period commencing on the date falling 90 days prior to the First Reset Date and ending on and including the First Reset Date and (ii) after the First Reset Date, on any interest payment date, at a redemption price in cash equal to 100% of the principal amount of the Notes being redeemed, plus, subject to the terms described in the first paragraph under “Supplemental Description of the Notes—Redemption—Redemption Procedures; Cancellation of Redemption” in the Preliminary Prospectus Supplement, accrued and unpaid interest on the Notes to be redeemed to, but excluding, the redemption date.

The Issuer may at its option redeem the Notes, in whole but not in part, at any time following the occurrence and during the continuance of a Tax Event (as defined in the Preliminary Prospectus Supplement) at a redemption price in cash equal to 100% of the principal amount of the Notes, plus, subject to the terms described in the first paragraph under “Supplemental Description of the Notes—Redemption—Redemption Procedures; Cancellation of Redemption” in the Preliminary Prospectus Supplement, accrued and unpaid interest on the Notes to, but excluding, the redemption date.

The Issuer may at its option redeem the Notes, in whole but not in part, at any time following the occurrence and during the continuance of a Rating Agency Event (as defined in the Preliminary Prospectus Supplement) at a redemption price in cash equal to 102% of the principal amount of the Notes, plus, subject to the terms described in the first paragraph under “Supplemental Description of the Notes—Redemption—Redemption Procedures; Cancellation of Redemption” in the Preliminary Prospectus Supplement, accrued and unpaid interest on the Notes to, but excluding, the redemption date.

For additional information and the definitions of the terms Tax Event and Rating Agency Event, see “Supplemental Description of the Notes—Redemption” in the Preliminary Prospectus Supplement.

BofA Securities, Inc.

Goldman Sachs & Co. LLC

J.P. Morgan Securities LLC

Morgan Stanley & Co. LLC

Wells Fargo Securities, LLC

Note: A securities rating is not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time.

We expect to deliver the Notes against payment for the Notes on or about September 9, 2024, which will be the fourth business day following the date of the pricing of the Notes. Under Rule 15c6-1 under the Securities Exchange Act of 1934, as amended, trades in the secondary market generally are required to settle in one business day, unless the parties to a trade expressly agree otherwise. Accordingly, purchasers who wish to trade Notes on the date of pricing or the next two succeeding business days will be required, by virtue of the fact that the Notes initially will settle in T+4, to specify alternative settlement arrangements to prevent a failed settlement. Purchasers of the Notes who wish to trade the Notes on the date of pricing or the next two succeeding business days should consult their own advisors.