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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30 , 2021 or DE ( State or other jurisdiction of incorporation or organization ) 801 East 86th Avenue Merrillville , IN □ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 ( Address of principal executive offices ) For the transition period from Commission file number 001-16189 NiSource Inc. to ( Exact name of registrant as specified in its charter ) 35-2108964 ( I.R.S. Employer Identification No. ) 46410 ( Zip Code ) ( 877 ) 647-5990 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of Each Class Trading Symbol ( s ) NI Name of Each Exchange on Which Registered NYSE Common Stock , par value $ 0.01 per share Depositary Shares , each representing a 1 / 1,000th ownership interest in a share of 6.50 % Series B Fixed - Rate Reset Cumulative Redeemable Perpetual Preferred Stock , par value $ 0.01 per share , liquidation preference $ 25,000 per share and a 1 / 1,000th ownership interest in a share of Series B - 1 Preferred Stock , par value $ 0.01 per share , liquidation preference $ 0.01 per share NI PR B Series A Corporate Units NIMC NYSE NYSE Indicate by check mark whether the registrant : ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes þ No " Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files . ) Yes þ No " Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer þ Accelerated filer " Emerging growth company Non - accelerated filer " Smaller reporting 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 . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No Indicate the number of shares outstanding of each of the issuer's classes of common stock , as of the latest practicable date : Common Stock , $ 0.01 Par Value : 392,704,679 shares outstanding at October 25 , 2021 .