Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership4,664,478 shares
Latest Disclosed Value $ 3,603,962,282
State Street Corp reports 0.08% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 4,664,478 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $3,603,962,282 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 4,660,808 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 0.08% 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 4,664,478 3,670 0.08 3,603,962 0.18 0.1244
2026-02-13 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,660,808 -30,415 -0.65 3,597,538 36.39 0.1207
2025-11-14 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,691,223 -140,779 -2.91 2,637,734 3.98 0.0915
2025-08-14 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,832,002 42,343 0.88 2,536,801 -16.49 0.0951
2025-05-15 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,789,659 -42,580 -0.88 3,037,745 -11.74 0.1252
2025-02-14 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,832,239 -70,165 -1.43 3,441,859 -33.21 0.1358
2024-11-14 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,902,404 61,277 1.27 5,153,603 1.29 0.2097
2024-08-14 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,841,127 -421 -0.01 5,088,170 9.19 0.2223
2024-05-15 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,841,548 -59,703 -1.22 4,659,942 8.25 0.2083
2024-02-14 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,901,251 72,145 1.49 4,304,720 8.32 0.2094
2023-11-14 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,829,106 -161,764 -3.24 3,974,161 10.82 0.2204
2023-08-14 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,990,870 97,254 1.99 3,586,140 -10.81 0.1883
2023-05-15 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,893,616 -67,269 -1.36 4,020,931 12.34 0.2269
2023-05-15 2022-12-31 13F/A-99 REGENERON PHARMACEUTICALS COM 75886F107 4,960,885 -90,874 -1.80 3,579,229 2.85 0.2103
2023-05-15 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,960,885 -90,874 3,579,229 0.2103
2022-11-15 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,051,759 -78,876 -1.54 3,480,005 14.74 0.2201
2022-08-15 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,130,635 5,168 0.10 3,032,872 -15.28 0.1817
2022-05-16 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 5,125,467 325,645 6.78 3,579,729 18.10 0.1770
2022-02-14 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,799,822 159,817 3.44 3,031,184 7.95 0.1438
2021-11-15 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,640,005 123,289 2.73 2,808,038 11.31 0.1484
2021-08-16 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,516,716 -30,585 -0.67 2,522,767 17.26 0.1330
2021-07-09 2021-03-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 4,547,301 -144,086 -3.07 2,151,510 -5.07 0.1234
2021-05-17 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,547,301 -144,086 2,151,510 0.1234
2021-02-16 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,691,387 33,849 0.73 2,266,456 -13.07 0.1388
2020-11-10 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,657,538 105,873 2.33 2,607,197 -8.15 0.1780
2020-08-14 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,551,665 934,332 25.83 2,838,646 60.71 0.2064
2020-06-19 2020-03-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 3,617,333 43,216 1.21 1,766,308 31.62 0.1545
2020-05-11 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,617,333 43,216 1,766,308 155,117.4075
2020-02-06 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,574,117 44,258 1.25 1,342,009 37.05 0.0919
2019-11-14 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,529,859 57,027 1.64 979,183 -9.92 0.0730
2019-08-14 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,472,832 7,781 0.22 1,086,996 -23.60 0.0810
2019-05-15 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,465,051 192,343 5.88 1,422,819 16.40 0.1110
2019-02-12 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,272,708 39,487 1.22 1,222,356 -6.43 0.1113
2018-11-09 2018-09-30 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,233,221 -7,181 -0.22 1,306,348 16.86 0.1003
2018-08-14 2018-06-30 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,240,402 -59,113 -1.79 1,117,884 -1.61 0.0934
2018-05-15 2018-03-31 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,299,515 -22,457 -0.68 1,136,219 -9.02 0.0965
2018-02-14 2017-12-31 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,321,972 77,548 2.39 1,248,933 -13.90 0.1004
2017-11-14 2017-09-30 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,244,424 -45,879 -1.39 1,450,644 -10.23 0.1252
2017-08-14 2017-06-30 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,290,303 -89,848 -2.66 1,615,987 23.37 0.1429
2017-05-15 2017-03-31 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,380,151 139,602 4.31 1,309,861 10.11 0.1169
2017-02-09 2016-12-31 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,240,549 68,675 2.17 1,189,574 -6.71 0.1119
2017-01-13 2016-09-30 13F/A-1 REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,171,874 78,579 2.54 1,275,142 18.04 0.1285
2016-11-14 2016-09-30 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 2,326,911 935,450
2016-08-12 2016-06-30 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,093,295 15,272 0.50 1,080,272 -2.63 0.1160
2016-05-20 2016-03-31 13F/A-1 REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,078,023 233 0.01 1,109,427 -33.60 0.1199
2016-05-12 2016-03-31 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,078,023 1,109,427
2016-02-16 2015-12-31 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,077,790 47,975 1.58 1,670,840 18.56 0.1826
2015-11-16 2015-09-30 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,029,815 5,220 0.17 1,409,308 -8.66 0.1641
2015-08-13 2015-06-30 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,024,595 -95,229 -3.05 1,542,926 9.54 0.1649
2015-05-15 2015-03-31 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,119,824 -72,230 -2.26 1,408,537 7.56 0.1445
2015-02-11 2014-12-31 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,192,054 53,497 1.70 1,309,533 15.73 0.1304
2014-11-12 2014-09-30 13F/A-1 REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,138,557 -90,714 -2.81 1,131,506 24.05 0.1217
2014-11-10 2014-09-30 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,138,557 1,131,506
2014-08-12 2014-06-30 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,229,271 -24,884 -0.76 912,155 -6.65 0.0985
2014-05-15 2014-03-31 13F/A-1 REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,254,155 -113,979 -3.38 977,144 5.40 0.1110
2014-05-13 2014-03-31 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,254,155 977,144
2014-02-06 2013-12-31 13F/A-1 REGENERON PHARMACEUTICALS Common equity shares 75886F107 3,368,134 98,441 3.01 927,054 -9.38 0.1031
2014-02-06 2013-12-31 13F REGENERON PHARMACEUTICALS Common equity shares 75886F107 2,462,182 421,203
2013-11-12 2013-09-30 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 3,269,693 9,633 0.30 1,022,994 39.54 0.1261
2013-08-08 2013-06-30 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 3,260,060 3,260,060 733,104 0.0956
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.