Atkore Inc.
MX ˙ BMV ˙ US0476491081
SecurityMX:ATKR / Atkore Inc.
InstitutionMagnetar Financial LLC
Latest Disclosed Ownership25,460 shares
Latest Disclosed Value $ 1,499,849
Magnetar Financial LLC reports 32.35% increase in ownership of ATKR / Atkore Inc.

On May 13, 2026 - Magnetar Financial LLC filed a 13F-HR form disclosing ownership of 25,460 shares of Atkore Inc. (MX:ATKR) valued at $1,499,849 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 19,237 shares of Atkore Inc.. This represents a change in shares of 32.35% during the quarter.

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)
2026-05-13 2026-03-31 13F ATKORE COM 047649108 25,460 6,223 32.35 1,500 23.27 0.0152
2026-02-17 2025-12-31 13F ATKORE COM 047649108 19,237 19,237 1,217 0.0119
2025-11-13 2025-09-30 13F ATKORE COM 047649108 0 -9,243 -100.00 0 -100.00
2025-08-12 2025-06-30 13F ATKORE COM 047649108 9,243 9,243 652 0.0032
2025-05-15 2025-03-31 13F ATKORE COM 047649108 0 -11,848 -100.00 0 -100.00
2025-02-11 2024-12-31 13F ATKORE COM 047649108 11,848 -31,243 -72.50 989 -72.94 0.0227
2024-11-13 2024-09-30 13F ATKORE COM 047649108 43,091 11,382 35.90 3,652 -14.66 0.0791
2024-08-14 2024-06-30 13F ATKORE COM 047649108 31,709 31,709 4,278 0.0892
2024-02-13 2023-12-31 13F ATKORE COM 047649108 0 -4,925 -100.00 0 -100.00
2023-11-14 2023-09-30 13F ATKORE COM 047649108 4,925 4,925 735 0.0188
2023-02-14 2022-12-31 13F ATKORE COM 047649108 0 -30,128 -100.00 0 -100.00
2022-11-14 2022-09-30 13F ATKORE COM 047649108 30,128 18,963 169.84 2,344 152.86 0.0325
2022-08-15 2022-06-30 13F ATKORE COM 047649108 11,165 11,165 927 0.0096
2017-08-14 2017-06-30 13F ATKORE INTL GROUP COM 047649108 0 -10,455 -100.00 0 -100.00
2017-05-15 2017-03-31 13F ATKORE INTL GROUP COM 047649108 10,455 10,455 275 0.0044
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.