Kaiser Aluminum Corporation
US ˙ NasdaqGS ˙ US4830077040

SecurityKALU / Kaiser Aluminum Corporation
InstitutionSei Investments Co
Latest Disclosed Ownership39,469 shares
Latest Disclosed Value $ 4,533,344
Sei Investments Co reports 123.80% increase in ownership of KALU / Kaiser Aluminum Corporation

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 39,469 shares of Kaiser Aluminum Corporation (US:KALU) valued at $4,533,409 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 17,636 shares of Kaiser Aluminum Corporation. This represents a change in shares of 123.80% during the quarter. The current value of the position is $7,354,259 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 KAISER ALUMINUM COM PAR $0.01 483007704 39,469 21,833 123.80 4,533 233.31 0.0045
2025-11-13 2025-09-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 17,636 3,689 26.45 1,361 22.08 0.0015
2025-08-14 2025-06-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 13,947 785 5.96 1,114 39.77 0.0013
2025-05-14 2025-03-31 13F/A-1 KAISER ALUMINUM COM PAR $0.01 483007704 13,162 -7,508 -36.32 798 -45.11 0.0010
2025-05-13 2025-03-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 20,668 -2 1,450 0.0016
2025-02-11 2024-12-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 20,670 -2,013 -8.87 1,452 -11.73 0.0019
2024-11-12 2024-09-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 22,683 -396 -1.72 1,645 -18.89 0.0021
2024-08-13 2024-06-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 23,079 7,450 47.67 2,029 45.27 0.0029
2024-05-07 2024-03-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 15,629 -462 -2.87 1,397 21.92 0.0020
2024-02-14 2023-12-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 16,091 265 1.67 1,145 -3.86 0.0018
2023-11-14 2023-09-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 15,826 -2,225 -12.33 1,191 -7.89 0.0021
2023-08-11 2023-06-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 18,051 -4,553 -20.14 1,293 -23.31 0.0023
2023-05-12 2023-03-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 22,604 -1,473 -6.12 1,687 -7.82 0.0031
2023-02-10 2022-12-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 24,077 -246 -1.01 1,829 22.59 0.0041
2022-11-14 2022-09-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 24,323 288 1.20 1,492 -23.17 0.0033
2022-08-15 2022-06-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 24,035 -329 -1.35 1,942 -16.29 0.0042
2022-05-13 2022-03-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 24,364 -18,374 -42.99 2,320 -42.56 0.0047
2022-02-14 2021-12-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 42,738 -13,482 -23.98 4,039 -34.12 0.0076
2021-11-12 2021-09-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 56,220 -8,764 -13.49 6,131 -23.62 0.0129
2021-08-06 2021-06-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 64,984 6,391 10.91 8,027 23.97 0.0178
2021-05-12 2021-03-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 58,593 -23,309 -28.46 6,475 -20.06 0.0163
2021-02-08 2020-12-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 81,902 13,681 20.05 8,100 121.55 0.0209
2020-12-04 2020-09-30 13F/A-1 KAISER ALUMINUM COM PAR $0.01 483007704 68,221 -4,316 -5.95 3,656 -31.55 0.0106
2020-11-06 2020-09-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 68,221 -4,316 3,656 8,802.8351
2020-08-17 2020-06-30 13F/A-1 KAISER ALUMINUM COM PAR $0.01 483007704 72,537 17,549 31.91 5,341 40.22 0.0166
2020-08-11 2020-06-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 60,013 5,025 6,565 17,807.9120
2020-05-14 2020-03-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 54,988 -5,064 -8.43 3,809 -42.80 0.0140
2020-02-06 2019-12-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 60,052 305 0.51 6,659 12.62 0.0199
2019-11-12 2019-09-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 59,747 -5,411 -8.30 5,913 -7.03 0.0151
2019-08-14 2019-06-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 65,158 7,334 12.68 6,360 5.02 0.0208
2019-05-15 2019-03-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 57,824 9,548 19.78 6,056 15.02 0.0203
2019-02-13 2018-12-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 48,276 0 0.00 5,265 0.00 0.0187
2018-11-08 2018-09-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 48,276 -502 -1.03 5,265 3.68 0.0191
2018-08-03 2018-06-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 48,778 141 0.29 5,078 3.46 0.0173
2018-05-11 2018-03-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 48,637 -1,205 -2.42 4,908 -7.85 0.0188
2018-02-08 2017-12-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 49,842 612 1.24 5,326 4.90 0.0185
2017-11-06 2017-09-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 49,230 10,755 27.95 5,077 49.06 0.0180
2017-07-31 2017-06-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 38,475 5,834 17.87 3,406 30.60 0.0136
2017-05-05 2017-03-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 32,641 -3,010 -8.44 2,608 -5.81 0.0114
2017-02-02 2016-12-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 35,651 -30,469 -46.08 2,769 -51.57 0.0134
2016-11-04 2016-09-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 66,120 2,274 3.56 5,718 -0.95 0.0290
2016-08-11 2016-06-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 63,846 5,203 8.87 5,773 16.46 0.0346
2016-05-10 2016-03-31 13F/A-1 KAISER ALUMINUM COM PAR $0.01 483007704 58,643 27,003 85.34 4,957 87.20 0.0308
2016-02-03 2015-12-31 13F KAISER ALUMINUM COM PAR $0.01 483007704 31,640 30,719 3,335.40 2,648 3,478.38 0.0161
2015-11-02 2015-09-30 13F/A-1 KAISER ALUMINUM COM PAR $0.01 483007704 921 723 365.15 74 362.50 0.0007
2015-10-30 2015-09-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 921 75
2015-08-07 2015-06-30 13F/A-1 KAISER ALUMINUM COM PAR $0.01 483007704 198 198 16 0.0001
2015-08-04 2015-06-30 13F KAISER ALUMINUM COM PAR $0.01 483007704 198 198 16 0.0001
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.