Nisource Inc. SEC filings NI
Nisource Inc. has 1,000 filings in SEC EDGAR's recent list, going back to Mar 9, 2015. Its latest annual report, Form ARS, was filed on Mar 30, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Oct 28, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Oct 28, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 424B2 | Prospectus | Nov 3, 2026 | — |
| FWP | Free writing prospectus | Nov 2, 2026 | — |
| 424B5 | Prospectus supplement | Nov 2, 2026 | — |
| 424B2 | Prospectus | Aug 14, 2026 | — |
| FWP | Free writing prospectus | Aug 13, 2026 | — |
| 424B5 | Prospectus supplement | Aug 13, 2026 | — |
| 424B2 | Prospectus | May 12, 2026 | — |
| FWP | Free writing prospectus | May 11, 2026 | — |
| 424B5 | Prospectus supplement | May 11, 2026 | — |
| S-8 | Employee stock plan registration | Nov 7, 2025 | — |
| 424B2 | Prospectus | Nov 4, 2025 | — |
| FWP | Free writing prospectus | Nov 4, 2025 | — |
| 424B5 | Prospectus supplement | Nov 3, 2025 | — |
| 424B5 | Prospectus supplement | Oct 31, 2025 | — |
| S-3ASR | Automatic shelf registration | Oct 30, 2025 | — |
| 424B2 | Prospectus | Jun 24, 2025 | — |
| FWP | Free writing prospectus | Jun 23, 2025 | — |
| 424B5 | Prospectus supplement | Jun 23, 2025 | — |
| 424B2 | Prospectus | Mar 21, 2025 | — |
| FWP | Free writing prospectus | Mar 20, 2025 | — |
| 424B5 | Prospectus supplement | Mar 20, 2025 | — |
| 424B2 | Prospectus | Sep 4, 2024 | — |
| FWP | Free writing prospectus | Sep 3, 2024 | — |
| 424B5 | Prospectus supplement | Sep 3, 2024 | — |
| S-8 | Employee stock plan registration | Aug 13, 2024 | — |
| 424B2 | Prospectus | Jun 18, 2024 | — |
| FWP | Free writing prospectus | Jun 17, 2024 | — |
| 424B5 | Prospectus supplement | Jun 17, 2024 | — |
| 424B5 | Prospectus supplement | Jun 17, 2024 | — |
| 424B2 | Prospectus | May 14, 2024 | — |
| FWP | Free writing prospectus | May 13, 2024 | — |
| 424B5 | Prospectus supplement | May 13, 2024 | — |
| 424B2 | Prospectus | Mar 12, 2024 | — |
| FWP | Free writing prospectus | Mar 11, 2024 | — |
| 424B5 | Prospectus supplement | Mar 11, 2024 | — |
| 424B5 | Prospectus supplement | Feb 22, 2024 | — |
| 424B5 | Prospectus supplement | Nov 14, 2023 | — |
| 424B2 | Prospectus | May 31, 2023 | — |
| FWP | Free writing prospectus | May 30, 2023 | — |
| 424B5 | Prospectus supplement | May 30, 2023 | — |
| 424B2 | Prospectus | Mar 22, 2023 | — |
| FWP | Free writing prospectus | Mar 21, 2023 | — |
| 424B5 | Prospectus supplement | Mar 21, 2023 | — |
| 424B5 | Prospectus supplement | Nov 10, 2022 | — |
| S-3ASR | Automatic shelf registration | Nov 1, 2022 | — |
| 424B2 | Prospectus | Jun 8, 2022 | — |
| FWP | Free writing prospectus | Jun 7, 2022 | — |
| 424B5 | Prospectus supplement | Jun 7, 2022 | — |
| S-8 | Employee stock plan registration | Nov 9, 2021 | — |
| 424B5 | Prospectus supplement | Aug 6, 2021 | — |
| 424B5 | Prospectus supplement | Apr 15, 2021 | — |
| FWP | Free writing prospectus | Apr 14, 2021 | — |
| FWP | Free writing prospectus | Apr 13, 2021 | — |
| 424B5 | Prospectus supplement | Apr 13, 2021 | — |
| 424B5 | Prospectus supplement | Feb 22, 2021 | — |
| S-8 | Employee stock plan registration | Aug 25, 2020 | — |
| 424B2 | Prospectus | Aug 13, 2020 | — |
| FWP | Free writing prospectus | Aug 12, 2020 | — |
| 424B5 | Prospectus supplement | Aug 12, 2020 | — |
| S-8 | Employee stock plan registration | May 19, 2020 | — |
| 424B2 | Prospectus | Apr 8, 2020 | — |
| FWP | Free writing prospectus | Apr 7, 2020 | — |
| 424B5 | Prospectus supplement | Apr 7, 2020 | — |
| 424B5 | Prospectus supplement | Nov 1, 2019 | — |
| S-3ASR | Automatic shelf registration | Nov 1, 2019 | — |
| S-8 | Employee stock plan registration | Aug 20, 2019 | — |
| 424B2 | Prospectus | Aug 8, 2019 | — |
| FWP | Free writing prospectus | Aug 7, 2019 | — |
| 424B5 | Prospectus supplement | Aug 7, 2019 | — |
| 424B5 | Prospectus supplement | Aug 1, 2019 | — |
| 424B3 | Prospectus | Feb 1, 2019 | — |
| 424B3 | Prospectus | Dec 27, 2018 | — |
| S-4 | Registration for a merger or exchange | Dec 13, 2018 | — |
| S-4 | Registration for a merger or exchange | Dec 13, 2018 | — |
| 424B5 | Prospectus supplement | Nov 30, 2018 | — |
| FWP | Free writing prospectus | Nov 28, 2018 | — |
| 424B5 | Prospectus supplement | Nov 28, 2018 | — |
| 424B3 | Prospectus | Nov 14, 2018 | — |
| POS AM | Filing | Nov 9, 2018 | — |
| 424B5 | Prospectus supplement | Nov 1, 2018 | — |
| S-8 | Employee stock plan registration | Nov 1, 2018 | — |
| POS AM | Filing | Oct 31, 2018 | — |
| 424B3 | Prospectus | Sep 5, 2018 | — |
| 424B3 | Prospectus | Aug 1, 2018 | — |
| 424B3 | Prospectus | Jun 19, 2018 | — |
| 424B3 | Prospectus | May 21, 2018 | — |
| S-1 | Registration statement | May 11, 2018 | — |
| 424B5 | Prospectus supplement | Nov 13, 2017 | — |
| FWP | Free writing prospectus | Nov 8, 2017 | — |
| 424B5 | Prospectus supplement | Nov 8, 2017 | — |
| S-3ASR | Automatic shelf registration | Nov 3, 2017 | — |
| 424B5 | Prospectus supplement | Sep 6, 2017 | — |
| FWP | Free writing prospectus | Sep 5, 2017 | — |
| 424B5 | Prospectus supplement | Sep 5, 2017 | — |
| 424B5 | Prospectus supplement | May 15, 2017 | — |
| FWP | Free writing prospectus | May 11, 2017 | — |
| 424B5 | Prospectus supplement | May 11, 2017 | — |
| 424B5 | Prospectus supplement | May 3, 2017 | — |
| 424B3 | Prospectus | Nov 7, 2016 | — |
| S-3ASR | Automatic shelf registration | Nov 1, 2016 | — |
| S-8 | Employee stock plan registration | May 14, 2015 | — |
Showing 101 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
Company profile
- Industry
- Electric & Other Services Combined (SIC 4931)
- Listed as
- NI (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Merrillville, IN
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1111711
- Former names
- NISOURCE INC/DE (until Jun 26, 2019); NEW NISOURCE INC (until Nov 2, 2000)
Other Electric & Other Services Combined companies
- Duke Energy CORP DUK
- Xcel Energy Inc XEL
- Exelon Corp EXC
- Consolidated Edison Inc ED
- PG&E Corp PCG
- Wec Energy Group, Inc. WEC
- Public Service Enterprise Group Inc PEG
- Ameren Corp AEE
Source: SEC EDGAR filings. This is company-reported data, not investment advice.