Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionFayez Sarofim & Co
Latest Disclosed Ownership2,460 shares
Latest Disclosed Value $ 1,900,694
Fayez Sarofim & Co reports 0.61% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 15, 2026 - Fayez Sarofim & Co filed a 13F-HR form disclosing ownership of 2,460 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $1,900,694 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 2,475 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -0.61% 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 Common Stock 75886F107 2,460 -15 -0.61 1,901 -0.52 0.0015
2026-02-13 2025-12-31 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 2,475 -75 -2.94 1,910 33.29 0.0046
2025-11-14 2025-09-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 2,550 -35 -1.35 1,434 5.60 0.0033
2025-08-14 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,585 -15 -0.58 1,357 -17.66 0.0033
2025-05-12 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,600 -75 -2.80 1,649 -13.49 0.0041
2025-02-14 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,675 0 0.00 1,905 -32.25 0.0046
2024-11-14 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,675 0 0.00 2,812 0.04 0.0071
2024-08-14 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,675 0 0.00 2,812 9.21 0.0076
2024-05-14 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,675 -74 -2.69 2,575 -1.76 0.0077
2024-02-15 2023-12-31 13F REGENERONPHARMACEUTICALS COM 75886F107 2,749 74 2.77 2,621 19.04 0.0080
2023-11-15 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,675 0 0.00 2,201 14.52 0.0074
2023-08-14 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,675 0 0.00 1,922 -12.52 0.0067
2023-05-11 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,675 25 0.94 2,198 14.97 0.0077
2023-02-13 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,650 300 12.77 1,912 18.04 0.0071
2022-11-15 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,350 0 0.00 1,619 16.56 0.0064
2022-08-12 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,350 50 2.17 1,389 -13.51 0.0051
2022-05-16 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,300 500 27.78 1,606 41.25 0.0051
2022-02-11 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,800 1,300 260.00 1,137 275.25 0.0034
2021-11-15 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 500 0 0.00 303 8.60 0.0010
2021-08-13 2021-06-30 13F RegeneronPharmaceuticals COMMON 75886F107 500 -300 -37.50 279 -26.39 0.0009
2021-05-13 2021-03-31 13F RegeneronPharmaceuticals COMMON 75886F107 800 -383 -32.38 379 -33.74 0.0014
2021-02-11 2020-12-31 13F RegeneronPharmaceuticals COMMON 75886F107 1,183 125 11.81 572 -3.38 0.0022
2020-11-13 2020-09-30 13F RegeneronPharmaceuticals COMMON 75886F107 1,058 0 0.00 592 -10.30 0.0025
2020-08-11 2020-06-30 13F RegeneronPharmaceuticals COMMON 75886F107 1,058 0 0.00 660 27.66 0.0030
2020-05-12 2020-03-31 13F RegeneronPharmaceuticals COMMON 75886F107 1,058 -100 -8.64 517 18.85 0.0032
2020-02-14 2019-12-31 13F RegeneronPharmaceuticals COMMON 75886F107 1,158 0 0.00 435 35.51 0.0021
2019-11-13 2019-09-30 13F RegeneronPharmaceuticals COMMON 75886F107 1,158 0 0.00 321 -11.33 0.0017
2019-08-09 2019-06-30 13F RegeneronPharmaceuticals COMMON 75886F107 1,158 0 0.00 362 -23.79 0.0019
2019-05-14 2019-03-31 13F RegeneronPharmaceuticals COMMON 75886F107 1,158 183 18.77 475 30.49 0.0025
2019-02-13 2018-12-31 13F RegeneronPharmaceuticals COMMON 75886F107 975 150 18.18 364 9.31 0.0022
2018-11-14 2018-09-30 13F RegeneronPharmaceuticals COMMON 75886F107 825 0 0.00 333 16.84 0.0017
2018-08-14 2018-06-30 13F RegeneronPharmaceuticals COMMON 75886F107 825 -46 -5.28 285 -5.00 0.0015
2018-05-10 2018-03-31 13F RegeneronPharmaceuticals COMMON 75886F107 871 -38 -4.18 300 -12.28 0.0016
2018-02-13 2017-12-31 13F RegeneronPharmaceuticals COMMON 75886F107 909 46 5.33 342 -11.40 0.0018
2017-11-08 2017-09-30 13F RegeneronPharmaceuticals COMMON 75886F107 863 0 0.00 386 -8.96 0.0020
2017-08-11 2017-06-30 13F RegeneronPharmaceuticals COMMON 75886F107 863 0 0.00 424 26.95 0.0023
2017-05-12 2017-03-31 13F RegeneronPharmaceuticals COMMON 75886F107 863 863 334 0.0018
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.