Northwestern Corp 10-K, 10-K/A, 10-KT, and 10-KT/A reports

Form type	Sec Links	Description	Filing date	Reporting date
10-K	Report \| Data	10-K	Feb 17, 2023	Dec 31, 2022
10-K	Report \| Data	10-K	Feb 11, 2022	Dec 31, 2021
10-K	Report \| Data	10-K	Feb 12, 2021	Dec 31, 2020
10-K	Report \| Data	10-K	Feb 13, 2020	Dec 31, 2019
10-K	Report \| Data	FORM 10-K 2018	Feb 12, 2019	Dec 31, 2018
10-K	Report \| Data	FORM 10-K 2017	Feb 13, 2018	Dec 31, 2017
10-K	Report \| Data	FORM 10-K 12.31.16	Feb 17, 2017	Dec 31, 2016
10-K	Report \| Data	10-K	Feb 11, 2016	Dec 31, 2015
10-K	Report \| Data	10-K NORTHWESTERN CORPORATION	Feb 12, 2015	Dec 31, 2014
10-K	Report \| Data	FORM 10-K DECEMBER 31, 2013	Feb 19, 2014	Dec 31, 2013
10-K	Report \| Data	10-K	Feb 14, 2013	Dec 31, 2012
10-K	Report \| Data	NORTHWESTERN CORPORATION FORM 10-K	Feb 16, 2012	Dec 31, 2011
10-K	Report \| Data		Feb 11, 2011	Dec 31, 2010
10-K	Report	10-K 12/31/2009	Feb 12, 2010	Feb 11, 2010
10-K	Report		Feb 13, 2009	Dec 31, 2008
10-K	Report		Feb 26, 2008	Dec 31, 2007
10-K	Report		Feb 28, 2007	Dec 31, 2006
10-K	Report	ANNUAL REPORT PURSUANT TO SECTION 13 AND 15(D)	Mar 3, 2006	Dec 31, 2005
10-K	Report	10-K	Mar 14, 2005	Dec 31, 2004
10-K	Report	10-K	Mar 15, 2004	Dec 31, 2003
10-K	Report	FORM 10-K	Apr 15, 2003	Dec 31, 2002
10-K	Report		Mar 30, 2000	Dec 31, 1999
10-K	Report	10K FOR DECEMBER 31, 1998	Mar 31, 1999	Dec 31, 1998
10-K	Report		Mar 31, 1998	Dec 31, 1997
10-K	Report		Mar 31, 1997	Dec 31, 1996
10-K	Report		Apr 1, 1996	Dec 31, 1995

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