Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionTredje AP-fonden
Latest Disclosed Ownership29,748 shares
Latest Disclosed Value $ 22,984,495
Tredje AP-fonden reports 82.17% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 12, 2026 - Tredje AP-fonden filed a 13F-HR form disclosing ownership of 29,748 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $22,984,495 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 16,330 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 82.17% 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)
2026-05-12 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 29,748 13,418 82.17 22,984 82.35 0.1257
2026-02-06 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 16,330 16,330 12,605 0.0949
2025-05-08 2025-03-31 13F REGENERON PHARMACEUT COM 75886F107 0 -27,000 -100.00 0 -100.00
2025-02-10 2024-12-31 13F REGENERON PHARMACEUT COM 75886F107 27,000 0 0.00 19,233 -32.24 0.1727
2024-11-08 2024-09-30 13F REGENERON PHARMACEUT COM 75886F107 27,000 0 0.00 28,383 0.02 0.2569
2024-08-12 2024-06-30 13F REGENERON PHARMACEUT COM 75886F107 27,000 0 0.00 28,378 9.20 0.2740
2024-05-13 2024-03-31 13F REGENERON PHARMACEUT COM 75886F107 27,000 22,362 482.15 25,987 538.03 0.2696
2024-02-12 2023-12-31 13F REGENERON PHARMACEUT COM 75886F107 4,638 -43,469 -90.36 4,074 -89.71 0.0508
2023-11-09 2023-09-30 13F REGENERON PHARMACEUT COM 75886F107 48,107 -722 -1.48 39,590 12.84 0.5838
2023-08-11 2023-06-30 13F REGENERON PHARMACEUT COM 75886F107 48,829 119 0.24 35,086 -12.34 0.4973
2023-05-10 2023-03-31 13F REGENERON PHARMACEUT COM 75886F107 48,710 20,861 74.91 40,024 99.20 0.6222
2023-02-10 2022-12-31 13F REGENERON PHARMACEUT COM 75886F107 27,849 1,603 6.11 20,093 11.13 0.3430
2022-11-10 2022-09-30 13F REGENERON PHARMACEUT COM 75886F107 26,246 17,194 189.95 18,080 237.88 0.3744
2022-08-11 2022-06-30 13F/A-1 REGENERON PHARMACEUT COM 75886F107 9,052 0 0.00 5,351 -15.36 0.1346
2022-08-10 2022-06-30 13F REGENERON PHARMACEUT COM 75886F107 9,052 0 5,351 0.1318
2022-05-09 2022-03-31 13F REGENERON PHARMACEUT COM 75886F107 9,052 0 0.00 6,322 10.58 0.1284
2022-02-10 2021-12-31 13F REGENERON PHARMACEUT COM 75886F107 9,052 0 0.00 5,717 4.36 0.1105
2021-11-10 2021-09-30 13F REGENERON PHARMACEUT COM 75886F107 9,052 0 0.00 5,478 8.35 0.1144
2021-08-06 2021-06-30 13F REGENERON PHARMACEUT COM 75886F107 9,052 0 0.00 5,056 18.05 0.1032
2021-05-10 2021-03-31 13F REGENERON PHARMACEUT COM 75886F107 9,052 0 0.00 4,283 -2.06 0.1021
2021-02-12 2020-12-31 13F REGENERON PHARMACEUT COM 75886F107 9,052 0 0.00 4,373 -13.70 0.1129
2020-11-10 2020-09-30 13F REGENERON PHARMACEUT COM 75886F107 9,052 0 0.00 5,067 -10.24 0.1643
2020-08-11 2020-06-30 13F REGENERON PHARMACEUT COM 75886F107 9,052 -6,174 -40.55 5,645 -24.08 0.2336
2020-05-28 2020-03-31 13F/A-1 REGENERON PHARMACEUT COM 75886F107 15,226 -521 -3.31 7,435 25.74 0.3853
2020-05-11 2020-03-31 13F REGENERON PHARMACEUT COM 75886F107 15,226 -521 6,984 398,367.0601
2020-02-10 2019-12-31 13F REGENERON PHARMACEUT COM 75886F107 15,747 -946 -5.67 5,913 27.68 0.2991
2019-11-12 2019-09-30 13F REGENERON PHARMACEUT COM 75886F107 16,693 118 0.71 4,631 -10.74 0.2215
2019-08-09 2019-06-30 13F REGENERON PHARMACEUT COM 75886F107 16,575 741 4.68 5,188 -20.21 0.2477
2019-05-10 2019-03-31 13F REGENERON PHARMACEUT COM 75886F107 15,834 1,065 7.21 6,502 17.88 0.3364
2019-02-11 2018-12-31 13F REGENERON PHARMACEUT COM 75886F107 14,769 -10,200 -40.85 5,516 -45.32 0.3363
2018-11-13 2018-09-30 13F REGENERON PHARMACEUT COM 75886F107 24,969 -2,559 -9.30 10,088 6.22 0.4858
2018-08-09 2018-06-30 13F REGENERON PHARMACEUT COM 75886F107 27,528 1,430 5.48 9,497 5.67 0.3296
2018-05-09 2018-03-31 13F REGENERON PHARMACEUT COM 75886F107 26,098 779 3.08 8,987 -5.59 0.3197
2018-02-12 2017-12-31 13F REGENERON PHARMACEUT COM 75886F107 25,319 -50 -0.20 9,519 -16.08 0.3234
2017-11-13 2017-09-30 13F REGENERON PHARMACEUT COM 75886F107 25,369 790 3.21 11,343 -6.04 0.4013
2017-08-10 2017-06-30 13F REGENERON PHARMACEUT COM 75886F107 24,579 -110 -0.45 12,072 26.18 0.4496
2017-05-11 2017-03-31 13F REGENERON PHARMACEUT COM 75886F107 24,689 44 0.18 9,567 5.75 0.3768
2017-02-10 2016-12-31 13F REGENERON PHARMACEUT COM 75886F107 24,645 -196 -0.79 9,047 -9.41 0.3826
2016-11-14 2016-09-30 13F REGENERON PHARMACEUT COM 75886F107 24,841 -759 -2.96 9,987 11.71 0.4512
2016-08-11 2016-06-30 13F REGENERON PHARMACEUT COM 75886F107 25,600 5 0.02 8,940 -6.07 0.3999
2016-05-12 2016-03-31 13F REGENERON PHARMACEUT COM 75886F107 25,595 2,132 9.09 9,518 -25.27 0.4347
2016-02-09 2015-12-31 13F REGENERON PHARMACEUT COM 75886F107 23,463 18,758 398.68 12,737 482.13 0.8173
2015-11-10 2015-09-30 13F REGENERON PHARMACEUT COM 75886F107 4,705 -513 -9.83 2,188 -17.81 0.2136
2015-08-14 2015-06-30 13F REGENERON PHARMACEUT COM 75886F107 5,218 5,218 2,662 0.2132
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.