Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionSectoral Asset Management Inc
Latest Disclosed Ownership2,919 shares
Latest Disclosed Value $ 2,481,720
Sectoral Asset Management Inc reports 21.43% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 15, 2026 - Sectoral Asset Management Inc filed a 13F-HR form disclosing ownership of 2,919 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $2,481,720 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 3,715 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -21.43% 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)
2026-05-15 2026-03-31 13F REGENERON PHARMCTCLS COM 75886F107 2,919 -796 -21.43 2,482 -13.46 2.0556
2026-02-09 2025-12-31 13F REGENERON PHARMCTCLS COM 75886F107 3,715 -253 -6.38 2,867 28.51 2.2986
2025-11-14 2025-09-30 13F REGENERON PHARMCTCLS COM 75886F107 3,968 1,195 43.09 2,231 53.33 1.3771
2025-08-14 2025-06-30 13F REGENERON PHARMCTCLS COM 75886F107 2,773 0 0.00 1,456 -17.24 0.9612
2025-05-15 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,773 -627 -18.44 1,759 -27.39 1.3689
2025-02-14 2024-12-31 13F REGENERON PHARMCTCLS COM 75886F107 3,400 0 0.00 2,422 -32.26 1.6165
2024-11-14 2024-09-30 13F REGENERON PHARMCTCLS COM 75886F107 3,400 -2,640 -43.71 3,574 -43.70 2.1112
2024-08-13 2024-06-30 13F REGENERON PHARMCTCLS COM 75886F107 6,040 -1,035 -14.63 6,348 -6.77 2.5800
2024-05-14 2024-03-31 13F REGENERON PHARMCTCLS COM 75886F107 7,075 3,240 84.49 6,810 102.17 2.6770
2024-02-14 2023-12-31 13F REGENERON PHARMCTCLS COM 75886F107 3,835 115 3.09 3,368 10.03 1.4504
2023-11-14 2023-09-30 13F REGENERON PHARMCTCLS COMMON 75886F107 3,720 524 16.40 3,061 33.32 0.5961
2023-08-11 2023-06-30 13F REGENERON PHARMCTCLS COM 75886F107 3,196 406 14.55 2,296 0.17 0.3829
2023-05-12 2023-03-31 13F REGENERON PHARMCTCLS COM 75886F107 2,790 80 2.95 2,292 17.24 0.4406
2023-02-10 2022-12-31 13F REGENERON PHARMCTCLS COM 75886F107 2,710 -610 -18.37 1,955 -14.52 0.3784
2022-11-10 2022-09-30 13F REGENERON PHARMCTCLS COM 75886F107 3,320 110 3.43 2,287 20.50 0.4506
2022-08-15 2022-06-30 13F REGENERON PHARMCTCLS COM 75886F107 3,210 170 5.59 1,898 -10.60 0.3824
2022-05-10 2022-03-31 13F REGENERON PHARMCTCLS COM 75886F107 3,040 -370 -10.85 2,123 -1.39 0.3769
2022-02-11 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,410 -310 -8.33 2,153 -4.35 0.3240
2021-11-15 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,720 -500 -11.85 2,251 -4.50 0.1872
2021-08-16 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,220 -400 -8.66 2,357 7.82 0.1907
2021-05-14 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,620 0 0.00 2,186 -2.06 0.1657
2021-02-12 2020-12-31 13F REGENERON PHARMCTICALS COM 75886F107 4,620 -18,310 -79.85 2,232 -82.61 0.1573
2020-11-13 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 22,930 4,892 27.12 12,836 14.11 1.1036
2020-08-13 2020-06-30 13F REGENERON PHARMCTCLS COM 75886F107 18,038 10,268 132.15 11,249 196.49 1.0326
2020-05-13 2020-03-31 13F REGENERON PHARMCTCLS COM 75886F107 7,770 7,770 3,794 0.7283
2019-02-12 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -1,370 -100.00 0 -100.00
2018-11-14 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,370 1,370 554 0.0588
2018-05-15 2018-03-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 0 -39,316 -100.00 0 -100.00
2018-02-13 2017-12-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 39,316 6,399 19.44 14,781 0.43 1.8469
2017-11-14 2017-09-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 32,917 -29,981 -47.67 14,718 -52.36 1.8959
2017-08-14 2017-06-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 62,898 57,203 1,004.44 30,892 1,299.73 3.3783
2017-05-15 2017-03-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 5,695 5,695 2,207 0.2577
2016-08-12 2016-06-30 13F REGENERON PHARMCTCLS COMMON 75886F107 0 -232,770 -100.00 0 -100.00
2016-05-13 2016-03-31 13F REGENERON PHARMCTCLS COMMON 75886F107 232,770 -3,530 -1.49 83,900 -34.60 4.0567
2016-02-12 2015-12-31 13F REGENERON PHARMCTCLS COMMON 75886F107 236,300 -7,800 -3.20 128,280 12.98 5.4695
2015-11-13 2015-09-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 244,100 69,200 39.57 113,541 27.26 5.2014
2015-08-13 2015-06-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 174,900 174,900 0.00 89,222 3.7215
2015-05-14 2015-03-31 13F REGENERON PHARMCEUTICALS COMMON 75886F107 0 -185,685 -100.00 0 -100.00
2015-02-13 2014-12-31 13F REGENERON PHARMCEUTICALS COMMON 75886F107 185,685 -42,115 -18.49 76,177 -7.24 3.4169
2014-11-13 2014-09-30 13F REGENERON PHARMCTCLS COM 75886F107 227,800 -100 -0.04 82,126 27.57 3.4561
2014-08-14 2014-06-30 13F REGENERON PHARMCTCLS COMMON 75886F107 227,900 -79,500 -25.86 64,375 -30.26 2.7277
2014-05-14 2014-03-31 13F REGENERON PHARMCTCLS COMMON 75886F107 307,400 31,400 11.38 92,306 21.51 3.7969
2014-02-12 2013-12-31 13F REGENERON PHARMCTCLS COMMON 75886F107 276,000 101,000 57.71 75,966 38.75 3.2760
2013-11-13 2013-09-30 13F REGENERON PHARMCTCLS COMMON 75886F107 175,000 -99,666 -36.29 54,752 -11.36 2.6344
2013-08-12 2013-06-30 13F REGENERON PHARMCTCLS COMMON 75886F107 274,666 274,666 61,767 1.8265
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.