Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionGrantham, Mayo, Van Otterloo & Co. LLC
Latest Disclosed Ownership55,353 shares
Latest Disclosed Value $ 42,767,942
Grantham, Mayo, Van Otterloo & Co. LLC reports 2.38% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 14, 2026 - Grantham, Mayo, Van Otterloo & Co. LLC filed a 13F-HR form disclosing ownership of 55,353 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $42,767,942 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 56,704 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -2.38% 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 55,353 -1,351 -2.38 42,768 -2.29 0.1094
2026-02-17 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 56,704 -4,770 -7.76 43,768 26.63 0.1119
2025-11-13 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 61,474 -3,809 -5.83 34,565 0.85 0.0975
2025-08-13 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 65,283 -18,047 -21.66 34,274 -35.15 0.1031
2025-05-14 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 83,330 20,351 32.31 52,850 17.81 0.1666
2025-02-13 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 62,979 10,982 21.12 44,862 -17.93 0.1459
2024-11-13 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 51,997 -5,267 -9.20 54,661 -9.18 0.1713
2024-08-13 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 57,264 -596 -1.03 60,186 8.08 0.2033
2024-05-14 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 57,860 -9,240 -13.77 55,690 -5.50 0.2024
2024-02-13 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 67,100 9,160 15.81 58,933 23.60 0.2601
2023-11-13 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 57,940 5,036 9.52 47,682 25.44 0.2252
2023-08-14 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 52,904 -14,238 -21.21 38,014 -31.10 0.1760
2023-05-12 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 67,142 -4,000 -5.62 55,169 7.48 0.2806
2023-02-13 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 71,142 17,142 31.74 51,328 37.98 0.2734
2022-11-10 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 54,000 -2,400 -4.26 37,199 11.57 0.2146
2022-08-12 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 56,400 8,500 17.75 33,340 -0.34 0.1806
2022-05-13 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 47,900 500 1.05 33,454 11.76 0.1614
2022-02-11 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 47,400 -1,900 -3.85 29,934 0.33 0.1438
2021-11-12 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 49,300 800 1.65 29,835 10.14 0.1476
2021-08-12 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 48,500 6,900 16.59 27,089 37.63 0.1351
2021-05-13 2021-03-31 13F REGENERON PHARMACEUTICALS CO 75886F107 41,600 13,444 47.75 19,683 44.71 0.1075
2021-02-12 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 28,156 27,700 6,074.56 13,602 5,234.12 0.0836
2020-11-13 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 456 0 0.00 255 -10.21 0.0018
2020-08-13 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 456 456 284 0.0021
2019-11-13 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -11,100 -100.00 0 -100.00
2019-08-13 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 11,100 10,600 2,120.00 3,474 1,594.63 0.0245
2019-05-14 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 500 500 -98.37 205 -97.02 0.0015
2013-11-14 2013-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -30,600 -100.00 0 -100.00
2013-08-13 2013-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 30,600 30,600 6,881 0.0179
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.