Atkore Inc.
US ˙ NYSE ˙ US0476491081

SecurityATKR / Atkore Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership205,918 shares
Latest Disclosed Value $ 13,024,363
Sei Investments Co reports 756.81% increase in ownership of ATKR / Atkore Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 205,918 shares of Atkore Inc. (US:ATKR) valued at $13,024,314 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 24,033 shares of Atkore Inc.. This represents a change in shares of 756.81% during the quarter. The current value of the position is $17,507,148 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 ATKORE COM 047649108 205,918 181,885 756.81 13,024 764.23 0.0129
2025-11-13 2025-09-30 13F ATKORE COM 047649108 24,033 -29,947 -55.48 1,508 -60.43 0.0016
2025-08-14 2025-06-30 13F ATKORE COM 047649108 53,980 24,186 81.18 3,808 113.09 0.0044
2025-05-14 2025-03-31 13F/A-1 ATKORE COM 047649108 29,794 2,704 9.98 1,787 -20.93 0.0023
2025-05-13 2025-03-31 13F ATKORE COM 047649108 28,740 1,650 2,325 0.0025
2025-02-11 2024-12-31 13F ATKORE COM 047649108 27,090 -24,896 -47.89 2,261 -48.69 0.0029
2024-11-12 2024-09-30 13F ATKORE COM 047649108 51,986 -18,809 -26.57 4,405 -53.88 0.0057
2024-08-13 2024-06-30 13F ATKORE COM 047649108 70,795 4,882 7.41 9,552 -23.87 0.0135
2024-05-07 2024-03-31 13F ATKORE COM 047649108 65,913 20,244 44.33 12,547 71.71 0.0184
2024-02-14 2023-12-31 13F ATKORE COM 047649108 45,669 -673 -1.45 7,307 5.68 0.0117
2023-11-14 2023-09-30 13F ATKORE COM 047649108 46,342 -12,106 -20.71 6,914 -24.14 0.0124
2023-08-11 2023-06-30 13F ATKORE COM 047649108 58,448 -11,525 -16.47 9,114 -7.27 0.0159
2023-05-12 2023-03-31 13F ATKORE COM 047649108 69,973 -41,928 -37.47 9,829 -22.55 0.0183
2023-02-10 2022-12-31 13F ATKORE COM 047649108 111,901 -30,373 -21.35 12,692 14.64 0.0282
2022-11-14 2022-09-30 13F ATKORE COM 047649108 142,274 -5,610 -3.79 11,070 -9.98 0.0247
2022-08-15 2022-06-30 13F ATKORE COM 047649108 147,884 42,887 40.85 12,297 19.02 0.0266
2022-05-13 2022-03-31 13F ATKORE COM 047649108 104,997 -34,678 -24.83 10,332 -33.50 0.0208
2022-02-14 2021-12-31 13F ATKORE COM 047649108 139,675 -19,373 -12.18 15,537 12.28 0.0291
2021-11-12 2021-09-30 13F ATKORE COM 047649108 159,048 7,017 4.62 13,838 27.92 0.0290
2021-08-06 2021-06-30 13F ATKORE COM 047649108 152,031 -7,927 -4.96 10,818 -5.28 0.0240
2021-05-12 2021-03-31 13F ATKORE COM 047649108 159,958 94,765 145.36 11,421 327.75 0.0288
2021-02-08 2020-12-31 13F ATKORE INTL GROUP COM 047649108 65,193 24,447 60.00 2,670 196.01 0.0069
2020-12-04 2020-09-30 13F/A-1 ATKORE INTL GROUP COM 047649108 40,746 -15,869 -28.03 902 -41.62 0.0026
2020-11-06 2020-09-30 13F ATKORE INTL GROUP COM 047649108 40,746 -15,869 902 2,171.8155
2020-08-17 2020-06-30 13F/A-1 ATKORE INTL GROUP COM 047649108 56,615 -2,246 -3.82 1,545 24.70 0.0048
2020-08-11 2020-06-30 13F ATKORE INTL GROUP COM 047649108 49,479 -9,382 1,754 4,757.8184
2020-05-14 2020-03-31 13F ATKORE INTL GROUP COM 047649108 58,861 -14,000 -19.21 1,239 -58.17 0.0046
2020-02-06 2019-12-31 13F ATKORE INTL GROUP COM 047649108 72,861 -6,369 -8.04 2,962 23.01 0.0088
2019-11-12 2019-09-30 13F ATKORE INTL GROUP COM 047649108 79,230 49,146 163.36 2,408 210.31 0.0062
2019-08-14 2019-06-30 13F ATKORE INTL GROUP COM 047649108 30,084 -2,280 -7.04 776 11.17 0.0025
2019-05-15 2019-03-31 13F ATKORE INTL GROUP COM 047649108 32,364 11,355 54.05 698 66.19 0.0023
2019-02-13 2018-12-31 13F ATKORE INTL GROUP COM 047649108 21,009 7,254 52.74 420 7.69 0.0015
2018-11-08 2018-09-30 13F ATKORE INTL GROUP COM 047649108 13,755 13,124 2,079.87 390 2,900.00 0.0014
2018-08-03 2018-06-30 13F ATKORE INTL GROUP COM 047649108 631 631 13 0.0000
2018-02-08 2017-12-31 13F ATKORE INTL GROUP COM 047649108 0 -9,862 -100.00 0 -100.00
2017-11-06 2017-09-30 13F ATKORE INTL GROUP COM 047649108 9,862 9,862 1,164 0.0041
2017-07-31 2017-06-30 13F ATKORE INTL GROUP COM 047649108 0 -15 -100.00 0 0.0000
2017-05-05 2017-03-31 13F ATKORE INTL GROUP COM 047649108 15 15 0 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.