Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionNational Pension Service
Latest Disclosed Ownership371,551 shares
Latest Disclosed Value $ 287,075,165
National Pension Service reports 2.93% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 12, 2026 - National Pension Service filed a 13F-HR form disclosing ownership of 371,551 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $287,075,165 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 360,988 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 2.93% 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)
2026-05-12 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 371,551 10,563 2.93 287,075 3.03 0.2180
2026-02-10 2025-12-31 13F REGENERON PHARMACEUTICALS REGENERON PHARMACEUTICALS 75886F107 360,988 82,853 29.79 278,636 78.17 0.2063
2025-11-04 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 278,135 7,069 2.61 156,387 9.89 0.1214
2025-08-08 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 271,066 18,020 7.12 142,310 -11.33 0.1229
2025-05-13 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 253,046 20,596 8.86 160,489 -3.08 0.1543
2025-02-05 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 232,450 8,833 3.95 165,581 -29.56 0.1567
2024-10-30 2024-09-30 13F REGENERONPHARMACEUTICALS COM 75886F107 223,617 32,457 16.98 235,075 17.00 0.2267
2024-08-13 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 191,160 3,411 1.82 200,915 11.18 0.2308
2024-05-14 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 187,749 1,439 0.77 180,707 10.43 0.2169
2024-02-07 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 186,310 3,887 2.13 163,634 7.76 0.2279
2023-11-15 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 182,423 3,212 1.79 151,851 19.61 0.2430
2023-08-16 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 179,211 -5,963 -3.22 126,957 -15.51 0.2048
2023-05-12 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 185,174 3,386 1.86 150,269 14.57 0.2736
2023-02-24 2022-12-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 181,788 2,131 1.19 131,158 5.53 0.2580
2023-02-21 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 181,788 2,131 131 0.2580
2023-02-24 2022-09-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 179,657 7,074 4.10 124,290 21.83 0.2593
2022-11-18 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 179,657 7,074 124,290 0.2593
2022-08-17 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 172,583 15,135 9.61 102,019 -7.23 0.2103
2022-05-13 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 157,448 1,906 1.23 109,965 11.95 0.2007
2022-02-15 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 155,542 -3,927 -2.46 98,228 1.78 0.1714
2021-11-18 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 159,469 -1,501 -0.93 96,507 7.34 0.1838
2021-08-17 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 160,970 2,553 1.61 89,908 19.95 0.1708
2021-05-14 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 158,417 13,314 9.18 74,953 6.92 0.1568
2021-02-19 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 145,103 13,101 9.92 70,101 -7.14 0.1598
2020-11-13 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 132,002 0 0.00 75,495 -8.29 0.1983
2020-08-11 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 132,002 3,482 2.71 82,323 31.18 0.2351
2020-05-27 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 128,520 2,716 2.16 62,755 32.85 0.2124
2020-02-21 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 125,804 19,021 17.81 47,237 59.47 0.1296
2019-11-15 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 106,783 4,867 4.78 29,622 -7.14 0.0937
2019-08-14 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 101,916 10,084 10.98 31,900 -15.40 0.1066
2019-05-15 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 91,832 3,422 3.87 37,708 2.78 0.1451
2019-02-15 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 88,410 4,075 4.83 36,687 7.67 0.1514
2018-11-15 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 84,335 -250 -0.30 34,075 17.85 0.1387
2018-08-14 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 84,585 6,301 8.05 28,913 7.25 0.1308
2018-04-13 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 78,284 6,275 8.71 26,958 -0.42 0.1336
2018-01-17 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 72,009 2,763 3.99 27,073 -10.15 0.1352
2017-10-16 2017-09-30 13F REGENERON PHARMACEUTICAL COM 75886F107 69,246 2,728 4.10 30,130 -11.17 0.1658
2017-07-13 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 66,518 6,481 10.80 33,920 46.30 0.2020
2017-04-11 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 60,037 3,430 6.06 23,185 11.57 0.1552
2017-01-18 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 56,607 4,501 8.64 20,780 -0.80 0.1422
2016-10-14 2016-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 52,106 4,240 8.86 20,948 25.32 0.1679
2016-08-11 2016-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 47,866 5,634 13.34 16,716 9.81 0.1484
2016-05-16 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 42,232 1,620 3.99 15,222 -30.96 0.1525
2016-02-12 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 40,612 2,420 6.34 22,047 24.10 0.2316
2015-10-15 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 38,192 4,574 13.61 17,765 3.59 0.2246
2015-07-15 2015-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 33,618 4,862 16.91 17,149 32.09 0.2225
2015-04-15 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 28,756 3,108 12.12 12,983 23.39 0.1876
2015-01-13 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 25,648 -2,752 -9.69 10,522 2.76 0.1776
2014-11-07 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 28,400 28,400 10,239 0.1626
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.