Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionToroso Investments, LLC
Latest Disclosed Ownership39,652 shares
Latest Disclosed Value $ 30,188,845
Toroso Investments, LLC reports 157.46% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 15, 2026 - Toroso Investments, LLC filed a 13F-HR form disclosing ownership of 39,652 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $30,188,845 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 15,401 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 157.46% 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 39,652 24,251 157.46 30,189 153.96 0.0476
2026-02-13 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 15,401 -176 -1.13 11,888 35.73 0.0282
2025-11-14 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 15,577 2,297 17.30 8,758 25.62 0.0175
2025-08-14 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 13,280 2,756 26.19 6,972 4.47 0.0419
2025-05-14 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 10,524 2,809 36.41 6,675 21.46 0.0543
2025-02-14 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 7,715 1,365 21.50 5,496 -17.68 0.0432
2024-11-25 2024-09-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 6,350 510 8.73 6,675 8.75 0.0706
2024-11-14 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,350 510 6,675 0.0457
2024-08-14 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,840 885 17.86 6,138 28.57 0.0825
2024-05-16 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,955 711 16.75 4,774 28.09 0.0788
2024-02-15 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,244 122 2.96 3,727 9.88 0.0867
2023-11-15 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,122 -2,178 -34.57 3,392 84,700.00 0.1032
2023-08-14 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,300 799 14.52 5 0.00 0.1331
2023-05-23 2023-03-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 5,501 -2,717 -33.06 5 -99.93 0.1488
2023-05-15 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 5,501 -2,717 5 0.1604
2023-02-15 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,218 2,047 33.17 5,929 39.47 0.2279
2022-11-23 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,171 -1,027 -14.27 4,251 -0.09 0.1766
2022-08-15 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 7,198 1,336 22.79 4,255 3.93 0.1559
2022-05-20 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 5,862 -371 -5.95 4,094 4.01 0.1220
2022-02-16 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,233 2,454 64.94 3,936 71.88 0.1205
2021-11-15 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,779 2,109 126.29 2,290 145.44 0.0857
2021-08-13 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,670 701 72.34 933 103.71 0.0364
2021-05-17 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 969 199 25.84 458 23.12 0.0214
2021-02-16 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 770 140 22.22 372 5.38 0.0257
2020-11-16 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 630 82 14.96 353 3.22 0.0471
2020-08-17 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 548 34 6.61 342 36.25 0.0464
2020-05-08 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 514 514 251 0.0744
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.