Otter Tail Corporation
US ˙ NasdaqGS ˙ US6896481032

SecurityOTTR / Otter Tail Corporation
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership19,472 shares
Latest Disclosed Value $ 1,710,624
Advisor Group Holdings, Inc. reports 43.53% decrease in ownership of OTTR / Otter Tail Corporation

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 19,472 shares of Otter Tail Corporation (US:OTTR) valued at $1,709,057 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 34,482 shares of Otter Tail Corporation. This represents a change in shares of -43.53% during the quarter. The current value of the position is $1,670,113 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)
2026-05-15 2026-03-31 13F OTTER TAIL COM 689648103 19,472 -15,010 -43.53 1,711 -38.67 0.0015
2026-02-17 2025-12-31 13F OTTER TAIL COM 689648103 34,482 2,644 8.30 2,788 4.54 0.0041
2025-11-14 2025-09-30 13F OTTER TAIL COM 689648103 31,838 10,237 47.39 2,667 60.08 0.0037
2025-09-04 2025-06-30 13F/A-1 OTTER TAIL COM 689648103 21,601 468 2.21 1,666 -1.94 0.0030
2025-08-13 2025-06-30 13F OTTER TAIL COM 689648103 19,433 -1,700 1,436 0.0017
2025-05-12 2025-03-31 13F OTTER TAIL COM 689648103 21,133 -629 -2.89 1,700 5.72 0.0038
2025-06-06 2024-12-31 13F/A-1 OTTER TAIL COM 689648103 21,762 2,046 10.38 1,608 4.28 0.0036
2025-02-07 2024-12-31 13F OTTER TAIL COM 689648103 19,471 -245 1,512 0.0039
2024-11-13 2024-09-30 13F OTTER TAIL COM 689648103 19,716 -1,493 -7.04 1,542 -17.06 0.0035
2024-08-13 2024-06-30 13F OTTER TAIL COM 689648103 21,209 -2,464 -10.41 1,858 -9.19 0.0044
2024-05-10 2024-03-31 13F OTTER TAIL COM 689648103 23,673 -654 -2.69 2,046 -1.02 0.0046
2024-02-12 2023-12-31 13F OTTER TAIL COM 689648103 24,327 -7,603 -23.81 2,068 -14.73 0.0036
2023-11-13 2023-09-30 13F OTTER TAIL COM 689648103 31,930 8,649 37.15 2,425 31.88 0.0036
2023-08-21 2023-06-30 13F/A-1 OTTER TAIL COM 689648103 23,281 -98 -0.42 1,839 8.76 0.0033
2023-08-10 2023-06-30 13F OTTER TAIL COM 689648103 23,281 -98 1,839 0.0005
2023-05-12 2023-03-31 13F OTTER TAIL COM 689648103 23,379 -2,699 -10.35 1,690 10.39 0.0032
2023-02-10 2022-12-31 13F OTTER TAIL COM 689648103 26,078 -217 -0.83 1,532 -5.38 0.0031
2022-11-14 2022-09-30 13F OTTER TAIL COM 689648103 26,295 -885 -3.26 1,618 -11.34 0.0037
2022-08-10 2022-06-30 13F OTTER TAIL COM 689648103 27,180 700 2.64 1,825 10.27 0.0040
2022-05-04 2022-03-31 13F OTTER TAIL COM 689648103 26,480 -2,932 -9.97 1,655 -21.27 0.0032
2022-02-03 2021-12-31 13F OTTER TAIL COM 689648103 29,412 318 1.09 2,102 28.96 0.0040
2021-11-05 2021-09-30 13F OTTER TAIL COM 689648103 29,094 260 0.90 1,630 15.77 0.0034
2021-08-02 2021-06-30 13F OTTER TAIL COM 689648103 28,834 699 2.48 1,408 8.39 0.0030
2021-05-13 2021-03-31 13F OTTER TAIL COM 689648103 28,135 504 1.82 1,299 10.27 0.0031
2021-02-10 2020-12-31 13F OTTER TAIL COM 689648103 27,631 2,247 8.85 1,178 28.18 0.0031
2020-11-12 2020-09-30 13F OTTER TAIL COM 689648103 25,384 959 3.93 919 -2.96 0.0027
2020-08-14 2020-06-30 13F OTTER TAIL COM 689648103 24,425 679 2.86 947 -10.41 0.0032
2020-05-18 2020-03-31 13F OTTER TAIL COM 689648103 23,746 23,746 1,057 0.0043
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.