Company filings profile · CIK 0001466593
Otter Tail Corp — SEC filings & insider activity.
Real, source-linked SEC EDGAR activity for Otter Tail Corp (OTTR): 27 filings in the last 90 days vs 22 in the prior 90 (filing-velocity rising ↑ · 1.23×). Latest material 8-K events, insider Form-4 transactions, and periodic reports — monitored for change.
✔ Verified against the public SEC EDGAR filing record as of Jun 21, 2026. Source-linked, daily-refreshed.
Material 8-K events — Otter Tail Corp
8-K disclosures decoded by item code (the material events: agreements, results, control/management changes, impairments, restatements).
| Filed | Event | |
|---|---|---|
| Jun 18, 2026 | Entry into a Material Agreement | ↗ |
| Jun 5, 2026 | Material Direct Financial Obligation | ↗ |
| May 29, 2026 | Entry into a Material Agreement | ↗ |
| May 15, 2026 | Other Events | ↗ |
| May 5, 2026 | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Apr 15, 2026 | Item 5.07 | ↗ |
| Apr 14, 2026 | Departure/Election of Directors or Officers; Regulation FD Disclosure; Financial Statements and Exhibits | ↗ |
| Mar 23, 2026 | Entry into a Material Agreement; Material Direct Financial Obligation; Financial Statements and Exhibits | ↗ |
| Feb 17, 2026 | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
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Insider transactions (Form 4 / 3 / 5)
Recent filings
| Filed | Form | Detail | |
|---|---|---|---|
| Jun 18, 2026 | 8-K | Entry into a Material Agreement | ↗ |
| Jun 5, 2026 | 8-K | Material Direct Financial Obligation | ↗ |
| May 29, 2026 | SD | SD | ↗ |
| May 29, 2026 | 8-K | Entry into a Material Agreement | ↗ |
| May 15, 2026 | 8-K | Other Events | ↗ |
| May 6, 2026 | 10-Q | 10-Q | ↗ |
| May 5, 2026 | 8-K | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Apr 30, 2026 | SCHEDULE 13G | ↗ | |
| Apr 29, 2026 | SCHEDULE 13G | ↗ | |
| Apr 15, 2026 | 4 | FORM 4 | ↗ |
| Apr 15, 2026 | 4 | FORM 4 | ↗ |
| Apr 15, 2026 | 4 | FORM 4 | ↗ |
| Apr 15, 2026 | 4 | FORM 4 | ↗ |
| Apr 15, 2026 | 8-K | Item 5.07 | ↗ |
| Apr 14, 2026 | 3 | FORM 3 | ↗ |
| Apr 14, 2026 | 4 | FORM 4 | ↗ |
| Apr 14, 2026 | 4 | FORM 4 | ↗ |
| Apr 14, 2026 | 8-K | Departure/Election of Directors or Officers; Regulation FD Disclosure; Financial Statements and Exhibits | ↗ |
| Apr 14, 2026 | 4 | FORM 4 | ↗ |
| Apr 14, 2026 | 4 | FORM 4 | ↗ |
| Apr 14, 2026 | 4 | FORM 4 | ↗ |
| Apr 14, 2026 | 4 | FORM 4 | ↗ |
| Apr 14, 2026 | 4 | FORM 4 | ↗ |
| Apr 14, 2026 | 4 | FORM 4 | ↗ |
| Apr 14, 2026 | 4 | FORM 4 | ↗ |
| Apr 9, 2026 | 4 | FORM 4 | ↗ |
| Mar 27, 2026 | SCHEDULE 13G/A | ↗ | |
| Mar 23, 2026 | 8-K | Entry into a Material Agreement; Material Direct Financial Obligation; Financial Statements and Exhibits | ↗ |
| Mar 2, 2026 | ARS | ARS | ↗ |
| Mar 2, 2026 | DEFA14A | DEFA14A | ↗ |
| Mar 2, 2026 | DEF 14A | DEF 14A | ↗ |
| Feb 23, 2026 | 10-K/A | 10-K/A | ↗ |
| Feb 18, 2026 | PRE 14A | PRE 14A | ↗ |
| Feb 18, 2026 | 10-K | 10-K | ↗ |
| Feb 17, 2026 | 8-K | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Feb 12, 2026 | 4 | FORM 4 | ↗ |
| Feb 12, 2026 | 4 | FORM 4 | ↗ |
| Feb 12, 2026 | 4 | FORM 4 | ↗ |
| Feb 12, 2026 | 4 | FORM 4 | ↗ |
| Feb 12, 2026 | 4 | FORM 4 | ↗ |