🕵️ Otter TAIL Corp ($OTTR)
SEC insider & ownership activity, last 12 months · CIK 1466593 · every row links its SEC filing
Over the last 12 months insiders sold $394K with no open-market buying against it. Paul L. Knutson sold $394K in discretionary trades (Aug). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 1 seller, $394K (3 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Paul L. Knutson | 0 | – | 3 | $394K | Aug 11, 2026 |
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 ↗ | |
| State Street Corporation | 5.1% | 13G | Aug 7, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Paul Knutson | $328K | Aug 7, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Officer/director changes (5.02) | Aug 28, 2026 | filing ↗ |
| Earnings (2.02) | Aug 3, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 3, 2026 | filing ↗ |
| 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 ↗ |