Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionAssenagon Asset Management S.A.
Latest Disclosed Ownership207,788 shares
Latest Disclosed Value $ 160,545,320
Assenagon Asset Management S.A. reports 10.91% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On April 20, 2026 - Assenagon Asset Management S.A. filed a 13F-HR form disclosing ownership of 207,788 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $160,545,320 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 9, 2026 disclosing 233,231 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -10.91% 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)
2026-04-20 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 207,788 -25,443 -10.91 160,545 -10.82 0.2437
2026-01-09 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 233,231 -244,579 -51.19 180,024 -32.99 0.2478
2025-10-07 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 477,810 54,485 12.87 268,658 20.88 0.3674
2025-07-11 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 423,325 -58,064 -12.06 222,246 -27.21 0.3299
2025-04-15 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 481,389 303,785 171.05 305,311 141.33 0.5093
2025-01-14 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 177,604 4,745 2.75 126,513 -30.38 0.2040
2024-10-23 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 172,859 44,457 34.62 181,716 34.65 0.3344
2024-07-18 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 128,402 -61,283 -32.31 134,954 -26.08 0.3004
2024-04-24 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 189,685 -26,838 -12.39 182,570 -4.00 0.4322
2024-01-17 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 216,523 122,103 129.32 190,170 144.74 0.5048
2023-11-06 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 94,420 -23,865 -20.18 77,704 -8.58 0.2406
2023-07-25 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 118,285 -84,982 -41.81 84,993 -49.11 0.2940
2023-04-18 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 203,267 81,231 66.56 167,018 189,693.18 0.5928
2023-01-12 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 122,036 39,065 47.08 88 -99.85 0.3176
2022-10-27 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 82,971 12,715 18.10 57,156 37.63 0.2194
2022-07-27 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 70,256 4,735 7.23 41,530 -9.25 0.1539
2022-04-25 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 65,521 35,303 116.83 45,761 139.80 0.1271
2022-02-01 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 30,218 -10,179 -25.20 19,083 -21.94 0.0553
2021-10-19 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 40,397 31,315 344.80 24,447 381.90 0.0782
2021-07-15 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 9,082 -182,599 -95.26 5,073 -94.41 0.0172
2021-04-26 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 191,681 35,429 22.67 90,692 20.14 0.3680
2021-02-01 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 156,252 156,252 75,487 0.3288
2020-10-07 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -34,668 -100.00 0 -100.00
2020-07-21 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 34,668 33,409 2,653.61 21,621 3,415.61 0.1387
2020-04-17 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,259 -27,029 -95.55 615 -94.21 0.0049
2020-01-17 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 28,288 -5,878 -17.20 10,622 12.07 0.0668
2019-10-16 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 34,166 -67,419 -66.37 9,478 -70.19 0.0634
2019-08-12 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 101,585 3,768 3.85 31,796 -20.84 0.2388
2019-04-26 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 97,817 62,022 173.27 40,166 200.44 0.3769
2019-01-23 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 35,795 -74,776 -67.63 13,369 -70.07 0.1515
2018-10-29 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 110,571 -3,330 -2.92 44,675 13.69 0.4410
2018-07-17 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 113,901 68,562 151.22 39,295 151.68 0.4536
2018-04-30 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 45,339 6,880 17.89 15,613 7.98 0.2034
2018-01-25 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 38,459 -83,515 -68.47 14,459 -73.49 0.1488
2017-10-18 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 121,974 121,974 54,537 0.5064
2017-07-19 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -760 -100.00 0 -100.00
2017-05-04 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 760 760 295 0.0063
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.