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Mailing Address 3010 W 69TH STREET SIOUX FALLS SD 57108
Business Address 3010 W 69TH STREET SIOUX FALLS SD 57108 6059782908
NORTHWESTERN CORP CIK#: 0000073088 (see all company filings)

SIC: 4931 - ELECTRIC & OTHER SERVICES COMBINED
State location: SD | State of Inc.: DE | Fiscal Year End: 1231
formerly: NORTHWESTERN PUBLIC SERVICE CO (filings through 1998-04-20)
(CF Office: 01 Energy & Transportation)
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Items 1 - 40  0000073088 Filings RSS Feed
Filings Format Description Filing Date File/Film Number
SC 13G/A  Documents [Amend] Statement of acquisition of beneficial ownership by individuals
Acc-no: 0001104659-24-020093 (34 Act)  Size: 13 KB
2024-02-13 005-36015
24627126
SC 13G/A  Documents [Amend] Statement of acquisition of beneficial ownership by individuals
Acc-no: 0001086364-24-001061 (34 Act)  Size: 13 KB
2024-01-22 005-36015
24548747
15-12G  Documents Securities registration termination [Section 12(g)]
Acc-no: 0001628280-23-041057 (34 Act)  Size: 14 KB
2023-12-07 001-10499
231472322
8-K  Documents   Interactive Data Current report, items 7.01 and 9.01
Acc-no: 0000073088-23-000158 (34 Act)  Size: 18 MB
2023-12-06 001-10499
231468408
8-K  Documents   Interactive Data Current report, items 1.01 and 2.03
Acc-no: 0000073088-23-000156 (34 Act)  Size: 2 MB
2023-12-05 001-10499
231467363
8-K  Documents   Interactive Data Current report, items 7.01 and 9.01
Acc-no: 0000073088-23-000154 (34 Act)  Size: 17 MB
2023-11-13 001-10499
231394760
8-K  Documents   Interactive Data Current report, items 2.02, 7.01, and 9.01
Acc-no: 0000073088-23-000152 (34 Act)  Size: 13 MB
2023-10-27 001-10499
231352518
10-Q  Documents   Interactive Data Quarterly report [Sections 13 or 15(d)]
Acc-no: 0000073088-23-000150 (34 Act)  Size: 9 MB
2023-10-27 001-10499
231351487
POSASR  Documents Post-effective Amendment to an automatic shelf registration statement
Acc-no: 0001628280-23-033387 (33 Act)  Size: 26 KB
2023-10-02 333-253047
231297737
POSASR  Documents Post-effective Amendment to an automatic shelf registration statement
Acc-no: 0001628280-23-033386 (33 Act)  Size: 26 KB
2023-10-02 333-257950
231297733
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001628280-23-033385 (33 Act)  Size: 27 KB
2023-10-02 333-175813
231297732
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001628280-23-033384 (33 Act)  Size: 27 KB
2023-10-02 333-149388
231297727
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001628280-23-033383 (33 Act)  Size: 27 KB
2023-10-02 333-124624
231297721
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001628280-23-033382 (33 Act)  Size: 27 KB
2023-10-02 333-122428
231297718
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001628280-23-033381 (33 Act)  Size: 27 KB
2023-10-02 033-56401
231297717
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001628280-23-033380 (33 Act)  Size: 27 KB
2023-10-02 333-11843
231297714
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001628280-23-033379 (33 Act)  Size: 27 KB
2023-10-02 333-18991
231297713
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001628280-23-033378 (33 Act)  Size: 27 KB
2023-10-02 333-80819
231297709
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001628280-23-033377 (33 Act)  Size: 27 KB
2023-10-02 333-80817
231297707
8-K  Documents   Interactive Data Current report, items 1.01, 3.01, 3.03, 5.02, 5.03, and 9.01
Acc-no: 0001628280-23-033376 (34 Act)  Size: 450 KB
2023-10-02 001-10499
231297706
25-NSE  Documents Notification filed by national security exchange to report the removal from listing and registration of matured, redeemed or retired securities
Acc-no: 0001354457-23-000712 (34 Act)  Size: 2 KB
2023-09-29 001-10499
231295379
8-K  Documents   Interactive Data Current report, items 7.01 and 9.01
Acc-no: 0000073088-23-000141 (34 Act)  Size: 18 MB
2023-09-13 001-10499
231251815
8-K  Documents   Interactive Data Current report, items 2.02, 7.01, and 9.01
Acc-no: 0000073088-23-000139 (34 Act)  Size: 13 MB
2023-07-25 001-10499
231107710
10-Q  Documents   Interactive Data Quarterly report [Sections 13 or 15(d)]
Acc-no: 0000073088-23-000137 (34 Act)  Size: 8 MB
2023-07-25 001-10499
231106149
8-K  Documents   Interactive Data Current report, items 2.03 and 9.01
Acc-no: 0000073088-23-000130 (34 Act)  Size: 1 MB
2023-07-06 001-10499
231073246
8-K  Documents   Interactive Data Current report, items 1.01 and 9.01
Acc-no: 0000073088-23-000124 (34 Act)  Size: 701 KB
2023-06-15 001-10499
231018054
424B3  Documents Prospectus [Rule 424(b)(3)]
Acc-no: 0000073088-23-000123 (33 Act)  Size: 54 KB
2023-06-15 333-253047
231018045
8-K  Documents   Interactive Data Current report, items 1.01 and 9.01
Acc-no: 0000073088-23-000118 (34 Act)  Size: 554 KB
2023-06-09 001-10499
231004383
8-K  Documents   Interactive Data Current report, items 7.01 and 9.01
Acc-no: 0000073088-23-000116 (34 Act)  Size: 16 MB
2023-06-08 001-10499
231000788
8-K  Documents   Interactive Data Current report, items 5.02 and 9.01
Acc-no: 0000073088-23-000114 (34 Act)  Size: 489 KB
2023-06-07 001-10499
23997745
8-K  Documents   Interactive Data Current report, items 7.01 and 9.01
Acc-no: 0000073088-23-000112 (34 Act)  Size: 16 MB
2023-05-19 001-10499
23941120
8-K  Documents   Interactive Data Current report, items 1.01, 2.03, and 9.01
Acc-no: 0000073088-23-000106 (34 Act)  Size: 505 KB
2023-05-05 001-10499
23892009
8-K  Documents   Interactive Data Current report, item 5.07
Acc-no: 0000073088-23-000104 (34 Act)  Size: 403 KB
2023-05-03 001-10499
23882748
8-K  Documents   Interactive Data Current report, items 2.02, 7.01, and 9.01
Acc-no: 0000073088-23-000100 (34 Act)  Size: 19 MB
2023-04-28 001-10499
23861018
10-Q  Documents   Interactive Data Quarterly report [Sections 13 or 15(d)]
Acc-no: 0000073088-23-000098 (34 Act)  Size: 7 MB
2023-04-28 001-10499
23859412
8-K  Documents   Interactive Data Current report, items 8.01 and 9.01
Acc-no: 0000073088-23-000091 (34 Act)  Size: 477 KB
2023-04-05 001-10499
23802238
8-K  Documents   Interactive Data Current report, items 1.01, 2.03, and 9.01
Acc-no: 0000073088-23-000089 (34 Act)  Size: 798 KB
2023-04-05 001-10499
23801798
8-K  Documents   Interactive Data Current report, items 7.01 and 9.01
Acc-no: 0000073088-23-000087 (34 Act)  Size: 17 MB
2023-03-15 001-10499
23735651
ARS  Documents Annual Report to Security Holders
Acc-no: 0000073088-23-000084 (34 Act)  Size: 6 MB
2023-03-14 001-10499
23730463
DEFA14A  Documents Additional definitive proxy soliciting materials and Rule 14(a)(12) material
Acc-no: 0000073088-23-000082 (34 Act)  Size: 1 MB
2023-03-14 001-10499
23729634