UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant To Section 13 OR 15(d)

of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 1, 2018

NiSource Inc.

(Exact name of registrant as specified in its charter)

Commission file number 001-16189

Registrant’s telephone number, including area code (877) 647-5990

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions.

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b–2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Item 1.01 Entry into a Material Definitive Agreement

On November 1, 2018, NiSource Inc. (the “Company”) entered into five separate equity distribution agreements, each dated November 1, 2018 (the “Equity Distribution Agreements”), (i) among the Company and MUFG Securities Americas Inc., as sales agent, and MUFG Securities EMEA plc, as forward purchaser, (ii) among the Company, BNP Paribas Securities Corp., as sales agent, and BNP Paribas, as forward purchaser, (iii) among the Company, Citigroup Global Markets Inc., as sales agent, and Citibank, N.A., as forward purchaser, (iv) among the Company and Goldman Sachs & Co. LLC, in its capacities as sales agent and forward purchaser, and (v) among the Company, RBC Capital Markets, LLC, as sales agent (collectively with the other sales agents, the “Agents”), and RBC Capital Markets LLC, as agent for Royal Bank of Canada, as forward purchaser, relating to issuances, offers and sales of shares of the Company’s common stock, par value $0.01 per share. In accordance with the terms of the Equity Distribution Agreements, the Company may offer and sell up to an aggregate of $500,000,000 of its common stock (including shares of common stock that may be sold pursuant to the forward sale agreements described below, the “Shares”) from time to time through any of the Agents, acting in their capacity as sales agents or as forward sellers, as described below. The sales of Shares under the Equity Distribution Agreements will be made in transactions that are deemed to be “at-the-market” offerings, including sales made by means of ordinary brokers’ transactions on the New York Stock Exchange or otherwise at market prices prevailing at the time of sale or as agreed to with the applicable Agent and any related forward seller and forward purchaser.

The Equity Distribution Agreements provide that, in addition to the issuance and sale of the shares by the Company through the Agents in their capacity as Agents, the Company may enter into forward sale agreements with the Agents or certain of their respective affiliates (when acting in its capacity under such a forward sale agreement, a “Forward Purchaser”). Concurrently with, and pursuant to, the Equity Distribution Agreements, the Company entered into five separate master forward sale confirmations (the “Master Forward Sale Confirmations”), each dated November 1, 2018, with MUFG Securities EMEA plc, BNP Paribas, Citibank, N.A, Goldman Sachs & Co. LLC and RBC Capital Markets LLC, as agent for Royal Bank of Canada, respectively, as forward purchasers. In connection with each forward sale agreement under a Master Forward Sale Confirmation, the relevant Forward Purchaser will, at the Company’s request, borrow from third parties and, through the relevant Agent, sell a number of Shares equal to the number of Shares underlying the particular forward sale agreement to hedge the forward sale agreement (each Agent, when acting as agent for a Forward Purchaser, a “Forward Seller”).

The Company will not initially receive any proceeds from the sale of borrowed shares of the Company’s common stock by a Forward Seller. The Company expects to receive proceeds from the sale of Shares by a Forward Seller upon future physical settlement of the relevant forward sale agreement with the relevant Forward Purchaser on dates specified by the Company on or prior to the maturity date of the relevant forward sale agreement. If the Company elects to cash settle or net share settle a forward sale agreement, the Company may not (in the case of cash settlement) or will not (in the case of net share settlement) receive any proceeds, and the Company may owe cash (in the case of cash settlement) or shares of common stock (in the case of net share settlement) to the relevant Forward Purchaser.

The Agents will offer the Shares at market prices prevailing at the time of sale. The Company will pay each Agent a commission of up to 2% of the sales price of all Shares issued by the Company and sold through the relevant Agent under the applicable Equity Distribution Agreement. The remaining sales proceeds, after deducting any expenses payable by the Company and any transaction fees imposed by any governmental, regulatory or self-regulatory organization in connection with the sales, will be the Company’s net proceeds for the sale of the Shares. In connection with each

forward sale agreement, the relevant Forward Seller will receive, in the form of a reduced initial forward sale price payable by the relevant Forward Purchaser under its forward sale agreement, a commission of up to 2% of the volume weighted average of the sales prices of all borrowed shares of Common Stock sold during the applicable period by it as a Forward Seller.

The Shares will be issued pursuant to the Company’s automatic shelf registration statement filed with the Securities and Exchange Commission on November 1, 2016 and amended on November 30, 2017 (File No. 333-214360), a base prospectus, dated November 30, 2017, included as part of the registration statement, and a prospectus supplement, dated November 1, 2018, filed with the Securities and Exchange Commission pursuant to Rule 
424(b) under the Securities Act of 1933, as amended.

The foregoing description of the Equity Distribution Agreements and the Master Forward Sale Confirmations does not purport to be complete and is qualified in its entirety by reference to the terms and conditions of the forms of Equity Distribution Agreement and Master Forward Sale Confirmation, which are filed as Exhibits 1.1 and 1.2, respectively, and are incorporated by reference into this Item 1.01.

Item 8.01 Other Items

On November 1, 2018, the Company issued a press release announcing the establishment of an “at-the-market” equity offering program. The Company’s press release, dated November 1, 2018, is filed as Exhibit 99.1 and is incorporated by reference into this Item 8.01.

Item 9.01 Financial Statements and Exhibits

(d)    Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.