Organon & Co.
US ˙ NYSE

SecurityOGN / Organon & Co.
InstitutionSei Investments Co
Latest Disclosed Ownership104,400 shares
Latest Disclosed Value $ 748,192
Sei Investments Co reports 84.14% decrease in ownership of OGN / Organon & Co.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 104,400 shares of Organon & Co. (US:OGN) valued at $748,548 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 658,295 shares of Organon & Co.. This represents a change in shares of -84.14% during the quarter. The current value of the position is $1,398,960 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 ORGANON COMMON STOCK 68622V106 104,400 -553,895 -84.14 748 -89.36 0.0007
2025-11-13 2025-09-30 13F ORGANON COMMON STOCK 68622V106 658,295 9,307 1.43 7,030 11.92 0.0076
2025-08-14 2025-06-30 13F ORGANON COMMON STOCK 68622V106 648,988 -11,627 -1.76 6,281 -36.14 0.0073
2025-05-14 2025-03-31 13F/A-1 ORGANON COMMON STOCK 68622V106 660,615 16,479 2.56 9,836 2.36 0.0127
2025-05-13 2025-03-31 13F ORGANON COMMON STOCK 68622V106 656,232 12,096 9,783 0.0106
2025-02-11 2024-12-31 13F ORGANON COMMON STOCK 68622V106 644,136 -43,155 -6.28 9,610 -26.91 0.0123
2024-11-12 2024-09-30 13F ORGANON COMMON STOCK 68622V106 687,291 99,173 16.86 13,148 8.00 0.0171
2024-08-13 2024-06-30 13F ORGANON COMMON STOCK 68622V106 588,118 17,206 3.01 12,174 13.42 0.0172
2024-05-07 2024-03-31 13F ORGANON COMMON STOCK 68622V106 570,912 135,373 31.08 10,733 70.91 0.0157
2024-02-14 2023-12-31 13F ORGANON COMMON STOCK 68622V106 435,539 -15,928 -3.53 6,281 -19.87 0.0101
2023-11-14 2023-09-30 13F ORGANON COMMON STOCK 68622V106 451,467 2,438 0.54 7,837 -16.13 0.0141
2023-08-11 2023-06-30 13F ORGANON COMMON STOCK 68622V106 449,029 33,252 8.00 9,344 -4.45 0.0163
2023-05-12 2023-03-31 13F ORGANON COMMON STOCK 68622V106 415,777 109,720 35.85 9,780 14.40 0.0182
2023-02-10 2022-12-31 13F ORGANON COMMON STOCK 68622V106 306,057 5,791 1.93 8,548 21.65 0.0190
2022-11-14 2022-09-30 13F ORGANON COMMON STOCK 68622V106 300,266 -81,357 -21.32 7,027 -45.32 0.0157
2022-08-15 2022-06-30 13F ORGANON COMMON STOCK 68622V106 381,623 2,430 0.64 12,852 -2.18 0.0278
2022-05-13 2022-03-31 13F ORGANON COMMON STOCK 68622V106 379,193 20,432 5.70 13,138 21.60 0.0264
2022-02-14 2021-12-31 13F ORGANON COMMON STOCK 68622V106 358,761 59,830 20.01 10,804 11.48 0.0203
2021-11-12 2021-09-30 13F ORGANON COMMON STOCK 68622V106 298,931 175,274 141.74 9,691 185.95 0.0203
2021-08-06 2021-06-30 13F ORGANON COMMON STOCK 68622V106 123,657 123,657 3,389 0.0075
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.