| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G/A | 2024-02-13 | VANGUARD GROUP INC | Otter Tail Corp | 5,040,893 | 12.1% | EDGAR |
| SC 13G/A | 2024-01-22 | BlackRock Inc. | Otter Tail Corp | 6,574,793 | 15.8% | EDGAR |
| SC 13G/A | 2023-03-08 | BlackRock Inc. | Otter Tail Corp | 6,944,307 | 16.7% | EDGAR |
| SC 13G/A | 2023-02-09 | VANGUARD GROUP INC | Otter Tail Corp | 4,908,646 | 11.8% | EDGAR |
| SC 13G/A | 2023-01-31 | BlackRock Inc. | Otter Tail Corp | 3,134,226 | 7.5% | EDGAR |
| SC 13G/A | 2022-02-09 | VANGUARD GROUP INC | Otter Tail Corp | 4,348,990 | 10.5% | EDGAR |
| SC 13G/A | 2022-02-03 | BlackRock Inc. | Otter Tail Corp | 2,994,269 | 7.2% | EDGAR |
| SC 13G/A | 2021-05-10 | VANGUARD GROUP INC | Otter Tail Corp | 4,153,530 | 10.0% | EDGAR |
| SC 13G/A | 2021-02-10 | VANGUARD GROUP INC | Otter Tail Corp | 3,967,248 | 9.7% | EDGAR |
| SC 13G/A | 2021-01-29 | BlackRock Inc. | Otter Tail Corp | 2,932,565 | 7.1% | EDGAR |
| SC 13D/A | 2020-02-24 | CASCADE INVESTMENT, L.L.C. | Otter Tail Corp | 3,456,499 | 8.6% | EDGAR |
| SC 13G/A | 2020-02-12 | VANGUARD GROUP INC | Otter Tail Corp | 4,046,772 | 10.2% | EDGAR |
| SC 13G/A | 2020-02-05 | BlackRock Inc. | Otter Tail Corp | 2,905,998 | 7.3% | EDGAR |
| SC 13G/A | 2019-02-11 | VANGUARD GROUP INC | Otter Tail Corp | 4,073,670 | 10.3% | EDGAR |
| SC 13G/A | 2019-02-06 | BlackRock Inc. | Otter Tail Corp | 2,826,591 | 7.1% | EDGAR |
| SC 13G/A | 2018-08-08 | VANGUARD GROUP INC | Otter Tail Corp | 3,986,909 | 10.0% | EDGAR |
| SC 13G/A | 2018-02-09 | VANGUARD GROUP INC | Otter Tail Corp | 3,655,117 | 9.2% | EDGAR |
| SC 13G/A | 2018-01-29 | BlackRock Inc. | Otter Tail Corp | 2,568,331 | 6.5% | EDGAR |
| SC 13G/A | 2017-02-10 | VANGUARD GROUP INC | Otter Tail Corp | 3,281,323 | 8.4% | EDGAR |
| SC 13G/A | 2017-01-25 | BlackRock Inc. | Otter Tail Corp | 2,480,567 | 6.3% | EDGAR |