Seaboard Corporation
US ˙ NYSEAM ˙ US8115431079

SecuritySEB / Seaboard Corporation
InstitutionMarshall Wace, Llp
Latest Disclosed Ownership277 shares
Latest Disclosed Value $ 1,566,163
Marshall Wace, Llp reports 78.10% decrease in ownership of SEB / Seaboard Corporation

On May 14, 2026 - Marshall Wace, Llp filed a 13F-HR form disclosing ownership of 277 shares of Seaboard Corporation (US:SEB) valued at $1,566,164 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,265 shares of Seaboard Corporation. This represents a change in shares of -78.10% during the quarter. The current value of the position is $1,504,969 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)
2026-05-14 2026-03-31 13F SEABOARD COMMON STOCK 811543107 277 -988 -78.10 1,566 -72.15 0.0016
2026-02-13 2025-12-31 13F SEABOARD COMMON STOCK 811543107 1,265 1,265 5,623 0.0051
2025-08-13 2025-06-30 13F SEABOARD COMMON STOCK 811543107 0 -2,875 -100.00 0 -100.00
2025-05-15 2025-03-31 13F SEABOARD COMMON STOCK 811543107 2,875 2,048 247.64 7,754 285.96 0.0098
2025-02-13 2024-12-31 13F SEABOARD COMMON STOCK 811543107 827 637 335.26 2,009 237.08 0.0024
2024-11-14 2024-09-30 13F SEABOARD COMMON STOCK 811543107 190 190 596 0.0007
2022-05-16 2022-03-31 13F SEABOARD COMMON STOCK 811543107 0 -6 -100.00 0 -100.00
2022-02-14 2021-12-31 13F SEABOARD COMMON STOCK 811543107 6 6 24 0.0000
2021-08-13 2021-06-30 13F SEABOARD COMMON STOCK 811543107 0 -244 -100.00 0 -100.00
2021-05-17 2021-03-31 13F SEABOARD COMMON STOCK 811543107 244 244 900 0.0041
2019-11-14 2019-09-30 13F SEABOARD COMMON STOCK 811543107 0 -67 -100.00 0 -100.00
2019-08-14 2019-06-30 13F SEABOARD COMMON STOCK 811543107 67 67 277 0.0023
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.