What securities did NiSource sell in this offering?

NiSource sold $500,000,000 of 4.750% Notes due 2031 and $750,000,000 of 5.300% Notes due 2036, for total aggregate principal of $1.25 billion.

When was the offering completed?

The Terms Agreement was entered into on May 11, 2026, and the sale of the Notes closed on May 18, 2026.

How will NiSource use the proceeds?

The Company intends to use the net proceeds for general corporate purposes, including to finance capital expenditures, for working capital and to repay existing indebtedness.

Under what registration and indenture were the Notes issued?

The Notes were offered under Registration Statement on Form S-3 (File No. 333-291167) and issued under an Indenture dated November 14, 2000, with The Bank of New York Mellon as successor trustee, as amended and supplemented.

NI 8-K SEC Disclosure — May 18, 2026

01—Abstract

Summary

Summary of the 8-K filed May 18, 2026. Cited figures are marked; the original filing is the authoritative source.

NiSource Inc. (NI) closed the sale of $1.25 billion^a of senior notes on May 18, 2026.

The offering consisted of $500,000,000^b of 4.750% Notes due 2031 and $750,000,000 of 5.300% Notes due 2036, sold under the Company's Form S-3 registration statement (File No. 333-291167) pursuant to a Terms Agreement dated May 11, 2026 with BNP Paribas Securities Corp., BofA Securities, Inc., MUFG Securities Americas Inc. and U.S. Bancorp Investments, Inc. as Lead Underwriters. The Notes were issued under a 2000 indenture with The Bank of New York Mellon as successor trustee. NiSource intends to use the net proceeds for general corporate purposes, including financing capital expenditures, working capital and repaying existing indebtedness.

The filing does not state the interest payment terms beyond the coupon rates or disclose the offering price, underwriting discounts or net proceeds amount. The filing is largely a financing disclosure.

It files the forms of the notes as Exhibits 4.1 and 4.2, an opinion of McGuireWoods LLP as Exhibit 5.1, and a related consent. Investors can view the offering as a routine refinancing and funding action, with the filing itself containing no new operating or earnings information.

02—Key points

Key Highlights

Closed the sale of $1.25 billion aggregate principal amount of senior notes on May 18, 2026.
$500,000,000 of 4.750% Notes due 2031 issued.
$750,000,000 of 5.300% Notes due 2036 issued.
Offering made under Form S-3 registration statement (File No. 333-291167) via a Terms Agreement dated May 11, 2026.
Net proceeds intended for general corporate purposes, capital expenditures, working capital and repayment of existing indebtedness.
Notes issued under a 2000 indenture with The Bank of New York Mellon as successor trustee.
Exhibits include forms of notes (4.1, 4.2) and McGuireWoods LLP legal opinion (5.1).

03—Questions

Frequently Asked Questions

What securities did NiSource sell in this offering?
NiSource sold $500,000,000 of 4.750% Notes due 2031 and $750,000,000 of 5.300% Notes due 2036, for total aggregate principal of $1.25 billion.
When was the offering completed?
The Terms Agreement was entered into on May 11, 2026, and the sale of the Notes closed on May 18, 2026.
Who were the underwriters?
The Lead Underwriters were BNP Paribas Securities Corp., BofA Securities, Inc., MUFG Securities Americas Inc. and U.S. Bancorp Investments, Inc.
How will NiSource use the proceeds?
The Company intends to use the net proceeds for general corporate purposes, including to finance capital expenditures, for working capital and to repay existing indebtedness.
Under what registration and indenture were the Notes issued?
The Notes were offered under Registration Statement on Form S-3 (File No. 333-291167) and issued under an Indenture dated November 14, 2000, with The Bank of New York Mellon as successor trustee, as amended and supplemented.

04—Continue

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