Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionJustInvest LLC
Latest Disclosed Ownership12,633 shares
Latest Disclosed Value $ 9,760,761
JustInvest LLC reports 5.51% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 14, 2026 - JustInvest LLC filed a 13F-HR form disclosing ownership of 12,633 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $9,760,761 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 11,973 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 5.51% 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)
2026-05-14 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 12,633 660 5.51 9,761 5.62 0.0958
2026-02-13 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,973 901 8.14 9,242 48.43 0.0902
2025-10-31 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 11,072 219 2.02 6,226 9.27 0.0638
2025-07-25 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 10,853 792 7.87 5,699 -10.69 0.0643
2025-05-14 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 10,061 -130 -1.28 6,381 -12.10 0.0941
2025-02-10 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 10,191 -414 -3.90 7,259 -34.89 0.1096
2024-11-12 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 10,605 1,046 10.94 11,148 10.96 0.1795
2024-08-12 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 9,559 1,129 13.39 10,047 23.83 0.1913
2024-05-09 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,430 386 4.80 8,114 14.85 0.1741
2024-02-08 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,044 75 0.94 7,065 7.72 0.1833
2023-11-08 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 7,969 810 11.31 6,558 27.49 0.1960
2023-07-28 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 7,159 253 3.66 5,144 -9.34 0.1576
2023-05-10 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,906 560 8.82 5,674 23.94 0.1971
2023-02-10 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,346 152 2.45 4,579 7.29 0.1889
2022-11-14 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,194 966 18.48 4,267 38.09 0.1930
2022-08-12 2022-06-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 5,228 1,281 32.46 3,090 12.08 0.1431
2022-08-09 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,228 1,281 3,090 0.1431
2022-05-16 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,947 1,166 41.93 2,757 57.00 0.1335
2022-02-23 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,781 441 18.85 1,756 24.01 0.1035
2021-11-09 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,340 461 24.53 1,416 34.99 0.1272
2021-08-11 2021-06-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 1,879 667 55.03 1,049 83.07 0.1098
2021-07-21 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,212 0 573 0.0872
2021-04-28 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,212 16 1.34 573 -0.87 0.0867
2021-01-20 2020-12-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 1,196 -48 -3.86 578 -16.95 0.1257
2020-10-26 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,244 144 13.09 696 1.46 0.1953
2020-07-27 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,100 59 5.67 686 35.04 0.3112
2020-05-13 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,041 1,041 508 0.2962
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.