🕵️ Otter TAIL Corp ($OTTR)
SEC insider & ownership activity, last 12 months · CIK 1466593 · every row links its SEC filing
Insiders were quiet over the last 12 months – no open-market buys or sells. No red-flag 8-Ks in the window.
Insider flow
0 buyers, $0 (0 lots) · 0 sellers, $0 (0 lots)
No open-market insider transactions in the last 12 months.
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Vanguard Portfolio Management | 7.1% | 13G | Apr 29, 2026 | filing ↗ | |
| Vanguard Capital Management | 5.2% | 13G | Apr 30, 2026 | filing ↗ |
Planned insider sales (Form 144)
No sale notices filed in the last 12 months.
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Material agreement (1.01) | Jun 17, 2026 | filing ↗ |
| New financial obligation (2.03) | Jun 4, 2026 | filing ↗ |
| Material agreement (1.01) | May 28, 2026 | filing ↗ |
| Other events (8.01) | May 15, 2026 | filing ↗ |
| Earnings (2.02) | May 4, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 4, 2026 | filing ↗ |
| Shareholder vote (5.07) | Apr 13, 2026 | filing ↗ |
| Officer/director changes (5.02) | Apr 13, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Apr 13, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 13, 2026 | filing ↗ |
| Material agreement (1.01) | Mar 19, 2026 | filing ↗ |
| New financial obligation (2.03) | Mar 19, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 19, 2026 | filing ↗ |
| Earnings (2.02) | Feb 16, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 16, 2026 | filing ↗ |
| Officer/director changes (5.02) | Dec 16, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Dec 16, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 16, 2025 | filing ↗ |
| Earnings (2.02) | Nov 3, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 3, 2025 | filing ↗ |
| Earnings (2.02) | Aug 4, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 4, 2025 | filing ↗ |