NI Nisource Inc

Make-whole call at any time prior to June 1, 2029 (the “Par Call Date”) at a redemption price equal to the greater of: (1)(a) 15 basis points spread over the applicable Treasury Benchmark (calculated to the Par Call Date) less (b) interest accrued to the date of redemption and (2) 100% of the principal amount of the Notes to be redeemed, plus, in either case, accrued and unpaid interest thereon to, but excluding, the redemption date.

Callable on or after the Par Call Date at par plus

accrued and unpaid interest thereon to, but excluding,

the redemption date.

Barclays Capital Inc.

BNP Paribas Securities Corp.

KeyBanc Capital Markets Inc.

MUFG Securities Americas Inc.

Scotia Capital (USA) Inc.

Academy Securities, Inc.

Siebert Williams Shank & Co., 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 June 24, 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.