Regeneron Pharmaceuticals, Inc.
IT ˙ ETLX ˙ US75886F1075
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityIT:4REGN / Regeneron Pharmaceuticals, Inc.
InstitutionRafferty Asset Management, LLC
Latest Disclosed Ownership29,589 shares
Latest Disclosed Value $ 22,861,645
Rafferty Asset Management, LLC reports 16.22% decrease in ownership of 4REGN / Regeneron Pharmaceuticals, Inc.

On May 15, 2026 - Rafferty Asset Management, LLC filed a 13F-HR form disclosing ownership of 29,589 shares of Regeneron Pharmaceuticals, Inc. (IT:4REGN) valued at $22,861,645 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 35,319 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -16.22% 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 PHARMACEUTICALS COM 75886F107 29,589 -5,730 -16.22 22,862 -16.14 0.0928
2026-02-13 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 35,319 -11,153 -24.00 27,262 4.33 0.0942
2025-11-12 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 46,472 -6,156 -11.70 26,130 -5.43 0.0848
2025-08-14 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 52,628 7,926 17.73 27,630 -2.55 0.0911
2025-05-14 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 44,702 -2,906 -6.10 28,351 -16.40 0.1209
2025-02-14 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 47,608 11,909 33.36 33,913 -9.64 0.1200
2024-11-13 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 35,699 -5,518 -13.39 37,528 -13.37 0.1286
2024-08-13 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 41,217 7,945 23.88 43,320 35.28 0.1608
2024-05-13 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 33,272 -904 -2.65 32,024 6.69 0.1195
2024-02-13 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 34,176 2,121 6.62 30,016 13.79 0.1266
2023-11-13 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 32,055 1,411 4.60 26,380 19.81 0.1550
2023-08-11 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 30,644 4,971 19.36 22,019 4.38 0.1241
2023-05-11 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 25,673 -364 -1.40 21,095 12.29 0.1429
2023-02-13 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 26,037 1,245 5.02 18,785 10.00 0.1573
2022-11-14 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 24,792 4,467 21.98 17,078 42.14 0.1818
2022-08-12 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 20,325 -897 -4.23 12,015 -18.94 0.1106
2022-05-13 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 21,222 3,136 17.34 14,822 29.77 0.0879
2022-02-10 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 18,086 3,487 23.89 11,422 29.28 0.0601
2021-11-10 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 14,599 665 4.77 8,835 13.52 0.0604
2021-08-10 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 13,934 -2,691 -16.19 7,783 -1.06 0.0490
2021-05-10 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 16,625 5,466 48.98 7,866 45.91 0.0537
2021-02-10 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,159 497 4.66 5,391 -9.67 0.0527
2020-11-13 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 10,662 1,708 19.08 5,968 6.88 0.0722
2020-08-07 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,954 733 8.92 5,584 39.11 0.0787
2020-05-15 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,221 -11,646 -58.62 4,014 -46.19 0.1680
2020-02-10 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 19,867 -10,489 -34.55 7,460 -11.41 0.1148
2019-11-14 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 30,356 6,157 25.44 8,421 11.18 0.1317
2019-08-09 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 24,199 6,710 38.37 7,574 5.47 0.1331
2019-05-15 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 17,489 12,926 283.28 7,181 321.42 0.1155
2019-02-11 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,563 -801 -14.93 1,704 -21.37 0.0372
2018-11-09 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,364 -40 -0.74 2,167 16.26 0.0336
2018-08-14 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,404 431 8.67 1,864 8.81 0.0278
2018-05-15 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,973 1,186 31.32 1,713 20.29 0.0254
2018-02-14 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,787 -1,332 -26.02 1,424 -37.79 0.0246
2017-11-13 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,119 2,008 64.55 2,289 49.80 0.0513
2017-08-11 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,111 87 2.88 1,528 30.38 0.0439
2017-05-11 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,024 366 13.77 1,172 20.08 0.0258
2017-02-13 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,658 861 47.91 976 35.18 0.0447
2016-11-14 2016-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,797 138 8.32 722 24.70 0.0264
2016-08-09 2016-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,659 -1,679 -50.30 579 -51.87 0.0392
2016-05-12 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,338 -848 -20.26 1,203 -47.58 0.0654
2016-02-12 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,186 269 6.87 2,295 25.96 0.2761
2015-11-12 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,917 259 7.08 1,822 -2.36 0.1439
2015-08-12 2015-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,658 1,830 100.11 1,866 126.18 0.1253
2015-05-14 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,828 274 17.63 825 29.31 0.0622
2015-02-13 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,554 423 37.40 638 56.37 0.1448
2014-11-14 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,131 280 32.90 408 70.00 0.0439
2014-08-13 2014-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 851 -490 -36.54 240 -40.45 0.0462
2014-05-14 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,341 379 39.40 403 52.08 0.0834
2014-02-06 2013-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 962 962 265 0.0634
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.