Seaboard Corporation
US ˙ NYSEAM ˙ US8115431079

SecuritySEB / Seaboard Corporation
InstitutionRhumbline Advisers
Latest Disclosed Ownership466 shares
Latest Disclosed Value $ 2,634,768
Rhumbline Advisers reports 0.22% increase in ownership of SEB / Seaboard Corporation

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 466 shares of Seaboard Corporation (US:SEB) valued at $2,634,773 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 465 shares of Seaboard Corporation. This represents a change in shares of 0.22% during the quarter. The current value of the position is $2,531,825 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)
2026-05-12 2026-03-31 13F SEABOARD CORP DEL COM COM 811543107 466 1 0.22 2,635 27.49 0.0023
2026-02-13 2025-12-31 13F SEABOARD CORP DEL COM COM 811543107 465 -360 -43.64 2,067 -31.32 0.0017
2025-11-06 2025-09-30 13F SEABOARD CORP DEL COM COM 811543107 825 -1,012 -55.09 3,009 -42.77 0.0024
2025-08-12 2025-06-30 13F SEABOARD CORP DEL COM COM 811543107 1,837 894 94.80 5,256 106.69 0.0045
2025-05-29 2025-03-31 13F/A-1 SEABOARD CORP DEL COM COM 811543107 943 12 1.29 2,543 12.47 0.0024
2025-04-08 2025-03-31 13F SEABOARD CORP DEL COM COM 811543107 943 12 2,543 0.0024
2025-05-29 2024-12-31 13F/A-1 SEABOARD CORP DEL COM COM 811543107 931 8 0.87 2,262 -21.90 0.0020
2025-01-30 2024-12-31 13F SEABOARD CORP DEL COM COM 811543107 931 8 2,262 0.0020
2024-11-12 2024-09-30 13F SEABOARD CORP DEL COM COM 811543107 923 10 1.10 2,895 0.35 0.0026
2024-08-01 2024-06-30 13F SEABOARD CORP DEL COM COM 811543107 913 283 44.92 2,886 42.05 0.0027
2024-05-09 2024-03-31 13F SEABOARD CORP DEL COM COM 811543107 630 -107 -14.52 2,031 -22.81 0.0020
2024-02-08 2023-12-31 13F SEABOARD CORP DEL COM COM 811543107 737 -19 -2.51 2,631 -7.26 0.0028
2023-11-09 2023-09-30 13F SEABOARD CORP DEL COM COM 811543107 756 150 24.75 2,837 31.53 0.0033
2023-08-08 2023-06-30 13F SEABOARD CORP DEL COM COM 811543107 606 55 9.98 2,158 107,750.00 0.0024
2023-05-11 2023-03-31 13F SEABOARD CORP DEL COM COM 811543107 551 -6 -1.08 2 -99.90 0.0026
2023-02-14 2022-12-31 13F SEABOARD CORP DEL COM COM 811543107 557 3 0.54 2,103 11.56 0.0028
2022-11-10 2022-09-30 13F SEABOARD CORP DEL COM COM 811543107 554 13 2.40 1,885 -10.24 0.0028
2022-08-11 2022-06-30 13F SEABOARD CORP DEL COM COM 811543107 541 61 12.71 2,100 4.01 0.0031
2022-05-12 2022-03-31 13F SEABOARD CORP DEL COM COM 811543107 480 -45 -8.57 2,019 -2.27 0.0026
2022-02-10 2021-12-31 13F SEABOARD CORP DEL COM COM 811543107 525 19 3.75 2,066 -0.43 0.0025
2021-11-12 2021-09-30 13F SEABOARD CORP DEL COM COM 811543107 506 -54 -9.64 2,075 -4.20 0.0028
2021-08-05 2021-06-30 13F SEABOARD CORP DEL COM COM 811543107 560 4 0.72 2,166 5.56 0.0028
2021-05-06 2021-03-31 13F SEABOARD CORP DEL COM COM 811543107 556 -17 -2.97 2,052 18.13 0.0028
2021-02-10 2020-12-31 13F SEABOARD CORP DEL COM COM 811543107 573 19 3.43 1,737 10.50 0.0024
2020-11-12 2020-09-30 13F SEABOARD CORP DEL COM COM 811543107 554 -1 -0.18 1,572 -3.44 0.0025
2020-08-13 2020-06-30 13F SEABOARD CORP DEL COM COM 811543107 555 47 9.25 1,628 13.93 0.0027
2020-05-06 2020-03-31 13F SEABOARD CORP DEL COM COM 811543107 508 24 4.96 1,429 -30.53 0.0030
2020-02-05 2019-12-31 13F SEABOARD CORP DEL COM COM 811543107 484 -3 -0.62 2,057 -3.47 0.0034
2019-10-23 2019-09-30 13F SEABOARD CORP DEL COM COM 811543107 487 -1 -0.20 2,131 5.55 0.0039
2019-08-14 2019-06-30 13F SEABOARD CORP DEL COM COM 811543107 488 3 0.62 2,019 -2.84 0.0038
2019-05-01 2019-03-31 13F SEABOARD CORP DEL COM COM 811543107 485 -35 -6.73 2,078 12.93 0.0040
2019-01-31 2018-12-31 13F SEABOARD CORP DEL COM COM 811543107 520 4 0.78 1,840 -3.87 0.0040
2018-11-07 2018-09-30 13F SEABOARD CORP DEL COM COM 811543107 516 -5 -0.96 1,914 -7.31 0.0037
2018-08-06 2018-06-30 13F SEABOARD CORP DEL COM COM 811543107 521 6 1.17 2,065 -5.97 0.0042
2018-05-02 2018-03-31 13F SEABOARD CORP DEL COM COM 811543107 515 13 2.59 2,196 -0.81 0.0046
2018-02-09 2017-12-31 13F SEABOARD CORP DEL COM COM 811543107 502 -1 -0.20 2,214 -2.29 0.0045
2017-11-06 2017-09-30 13F SEABOARD CORP DEL COM COM 811543107 503 1 0.20 2,266 13.02 0.0049
2017-08-02 2017-06-30 13F SEABOARD CORP DEL COM COM 811543107 502 -127 -20.19 2,005 -23.56 0.0046
2017-05-02 2017-03-31 13F SEABOARD CORP DEL COM COM 811543107 629 12 1.94 2,623 7.59 0.0061
2017-01-27 2016-12-31 13F SEABOARD CORP DEL COM COM 811543107 617 12 1.98 2,438 17.16 0.0062
2016-11-08 2016-09-30 13F SEABOARD CORP DEL COM COM 811543107 605 8 1.34 2,081 21.41 0.0057
2016-08-11 2016-06-30 13F SEABOARD CORP DEL COM COM 811543107 597 -96 -13.85 1,714 -17.64 0.0051
2016-05-02 2016-03-31 13F SEABOARD CORP USD COM 811543107 693 40 6.13 2,081 10.11 0.0065
2016-02-03 2015-12-31 13F SEABOARD CORP USD COM 811543107 653 13 2.03 1,890 -4.11 0.0061
2015-11-04 2015-09-30 13F SEABOARD CORP USD COM 811543107 640 23 3.73 1,971 -11.26 0.0067
2015-08-04 2015-06-30 13F SEABOARD CORP USD COM 811543107 617 -27 -4.19 2,221 -16.54 0.0071
2015-05-12 2015-03-31 13F SEABOARD CORP USD COM 811543107 644 24 3.87 2,661 2.23 0.0077
2015-02-06 2014-12-31 13F SEABOARD CORP USD COM 811543107 620 21 3.51 2,603 62.48 0.0076
2014-11-12 2014-09-30 13F SEABOARD CORP USD COM 811543107 599 0 0.00 1,602 -11.44 0.0048
2014-08-06 2014-06-30 13F SEABOARD CORP USD COM 811543107 599 -17 -2.76 1,809 12.01 0.0053
2014-05-06 2014-03-31 13F SEABOARD CORP USD COM 811543107 616 -7 -1.12 1,615 -7.24 0.0048
2014-02-03 2013-12-31 13F SEABOARD CORP USD COM 811543107 623 -24 -3.71 1,741 -2.08 0.0051
2013-11-05 2013-09-30 13F SEABOARD CORP USD COM 811543107 647 -4 -0.61 1,778 0.85 0.0055
2013-08-07 2013-06-30 13F SEABOARD CORP USD COM 811543107 651 651 1,763 0.0057
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.