Otter Tail Corporation
US ˙ NasdaqGS ˙ US6896481032

SecurityOTTR / Otter Tail Corporation
InstitutionSei Investments Co
Latest Disclosed Ownership5,924 shares
Latest Disclosed Value $ 478,702
Sei Investments Co ownership in OTTR / Otter Tail Corporation

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 5,924 shares of Otter Tail Corporation (US:OTTR) valued at $478,718 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 5,924 shares of Otter Tail Corporation. This represents a change in shares of 0.00% during the quarter. The current value of the position is $512,248 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-02-13 2025-12-31 13F OTTER TAIL COM 689648103 5,924 0 0.00 479 -1.44 0.0005
2025-11-13 2025-09-30 13F OTTER TAIL COM 689648103 5,924 -785 -11.70 486 -6.19 0.0005
2025-08-14 2025-06-30 13F OTTER TAIL COM 689648103 6,709 -696 -9.40 517 -13.11 0.0006
2025-05-14 2025-03-31 13F/A-1 OTTER TAIL COM 689648103 7,405 -304 -3.94 595 4.57 0.0008
2025-05-13 2025-03-31 13F OTTER TAIL COM 689648103 7,709 0 569 0.0006
2025-02-11 2024-12-31 13F OTTER TAIL COM 689648103 7,709 318 4.30 569 -1.39 0.0007
2024-11-12 2024-09-30 13F OTTER TAIL COM 689648103 7,391 282 3.97 578 -7.23 0.0008
2024-08-13 2024-06-30 13F OTTER TAIL COM 689648103 7,109 701 10.94 623 12.48 0.0009
2024-05-07 2024-03-31 13F OTTER TAIL COM 689648103 6,408 -1,116 -14.83 554 -13.46 0.0008
2024-02-14 2023-12-31 13F OTTER TAIL COM 689648103 7,524 184 2.51 639 14.72 0.0010
2023-11-14 2023-09-30 13F OTTER TAIL COM 689648103 7,340 342 4.89 557 0.91 0.0010
2023-08-11 2023-06-30 13F OTTER TAIL COM 689648103 6,998 0 0.00 553 9.31 0.0010
2023-05-12 2023-03-31 13F OTTER TAIL COM 689648103 6,998 -4,398 -38.59 506 -24.51 0.0009
2023-02-10 2022-12-31 13F OTTER TAIL COM 689648103 11,396 -8,120 -41.61 669 -44.34 0.0015
2022-11-14 2022-09-30 13F OTTER TAIL COM 689648103 19,516 -14,340 -42.36 1,202 -46.79 0.0027
2022-08-15 2022-06-30 13F OTTER TAIL COM 689648103 33,856 4,341 14.71 2,259 22.44 0.0049
2022-05-13 2022-03-31 13F OTTER TAIL COM 689648103 29,515 255 0.87 1,845 -11.68 0.0037
2022-02-14 2021-12-31 13F OTTER TAIL COM 689648103 29,260 14,079 92.74 2,089 145.76 0.0039
2021-11-12 2021-09-30 13F OTTER TAIL COM 689648103 15,181 -1,216 -7.42 850 6.12 0.0018
2021-08-06 2021-06-30 13F OTTER TAIL COM 689648103 16,397 30 0.18 801 8.83 0.0018
2021-05-12 2021-03-31 13F OTTER TAIL COM 689648103 16,367 -100 -0.61 736 4.99 0.0019
2021-02-08 2020-12-31 13F OTTER TAIL COM 689648103 16,467 -19,609 -54.35 701 -46.28 0.0018
2020-12-04 2020-09-30 13F/A-1 OTTER TAIL COM 689648103 36,076 17,346 92.61 1,305 81.75 0.0038
2020-11-06 2020-09-30 13F OTTER TAIL COM 689648103 36,076 17,346 1,305 3,142.1498
2020-08-17 2020-06-30 13F/A-1 OTTER TAIL COM 689648103 18,730 1,575 9.18 718 -6.63 0.0022
2020-08-11 2020-06-30 13F OTTER TAIL COM 689648103 18,430 1,275 817 2,216.1560
2020-05-14 2020-03-31 13F OTTER TAIL COM 689648103 17,155 -6,762 -28.27 769 -36.81 0.0028
2020-02-06 2019-12-31 13F OTTER TAIL COM 689648103 23,917 8,900 59.27 1,217 51.37 0.0036
2019-11-12 2019-09-30 13F OTTER TAIL COM 689648103 15,017 -345 -2.25 804 -0.12 0.0021
2019-08-14 2019-06-30 13F OTTER TAIL COM 689648103 15,362 321 2.13 805 8.93 0.0026
2019-05-15 2019-03-31 13F OTTER TAIL COM 689648103 15,041 1,083 7.76 739 7.73 0.0025
2019-02-13 2018-12-31 13F OTTER TAIL COM 689648103 13,958 7,139 104.69 686 116.40 0.0024
2018-11-08 2018-09-30 13F OTTER TAIL COM 689648103 6,819 -14,370 -67.82 317 -68.58 0.0011
2018-08-03 2018-06-30 13F OTTER TAIL COM 689648103 21,189 1,805 9.31 1,009 20.12 0.0034
2018-05-11 2018-03-31 13F OTTER TAIL COM 689648103 19,384 11,024 131.87 840 125.81 0.0032
2018-02-08 2017-12-31 13F OTTER TAIL COM 689648103 8,360 -54 -0.64 372 2.20 0.0013
2017-11-06 2017-09-30 13F OTTER TAIL COM 689648103 8,414 1,244 17.35 364 28.17 0.0013
2017-07-31 2017-06-30 13F OTTER TAIL COM 689648103 7,170 3,596 100.62 284 108.82 0.0011
2017-05-05 2017-03-31 13F OTTER TAIL COM 689648103 3,574 274 8.30 136 1.49 0.0006
2017-02-02 2016-12-31 13F OTTER TAIL COM 689648103 3,300 1,498 83.13 134 116.13 0.0006
2016-11-04 2016-09-30 13F OTTER TAIL COM 689648103 1,802 1,621 895.58 62 933.33 0.0003
2016-08-11 2016-06-30 13F OTTER TAIL COM 689648103 181 24 15.29 6 20.00 0.0000
2016-05-10 2016-03-31 13F/A-1 OTTER TAIL COM 689648103 157 157 5 0.0000
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.