Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionAsset Management One Co., Ltd.
Latest Disclosed Ownership50,805 shares
Latest Disclosed Value $ 39,253,975
Asset Management One Co., Ltd. reports 6.23% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 8, 2026 - Asset Management One Co., Ltd. filed a 13F-HR form disclosing ownership of 50,805 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $39,253,975 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 54,181 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -6.23% 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)
2026-05-08 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 50,805 -3,376 -6.23 39,254 -7.16 0.1158
2026-01-27 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 54,181 -6,358 -10.50 42,283 24.22 0.1176
2025-10-22 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 60,539 -305 -0.50 34,039 6.56 0.0986
2025-07-31 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 60,844 -1,494 -2.40 31,943 -19.21 0.1001
2025-04-23 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 62,338 2,358 3.93 39,537 -7.47 0.1367
2025-01-30 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 59,980 3,504 6.20 42,730 -28.03 0.1468
2024-10-30 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 56,476 1,213 2.19 59,370 2.21 0.2113
2024-07-18 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 55,263 -456 -0.82 58,083 8.31 0.2222
2024-05-02 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 55,719 224 0.40 53,629 9.60 0.2067
2024-01-24 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 55,495 3,095 5.91 48,930 13.46 0.1970
2023-10-19 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 52,400 272 0.52 43,123 15.13 0.1920
2023-07-31 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 52,128 -237 -0.45 37,456 -12.95 0.1585
2023-04-25 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 52,365 771 1.49 43,027 15.62 0.1950
2023-02-06 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 51,594 -3,645 -6.60 37,215 -2.20 0.1814
2022-11-04 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 55,239 -1,772 -3.11 38,052 12.91 0.1936
2022-07-29 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 57,011 -3,380 -5.60 33,700 -20.10 0.1582
2022-05-13 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 60,391 -147 -0.24 42,178 7.71 0.1647
2022-02-09 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 60,538 -2,883 -4.55 39,158 2.02 0.1364
2021-11-02 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 63,421 -1,322 -2.04 38,381 6.14 0.1471
2021-08-03 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 64,743 1,483 2.34 36,161 20.82 0.1346
2021-05-14 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 63,260 -337 -0.53 29,930 -2.80 0.1189
2021-02-12 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 63,597 -1,897 -2.90 30,793 -16.01 0.1268
2020-11-13 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 65,494 5,611 9.37 36,663 -1.83 0.1685
2020-08-14 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 59,883 17,519 41.35 37,346 80.55 0.1837
2020-05-14 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 42,364 23 0.05 20,685 30.11 0.1208
2020-02-14 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 42,341 -2,136 -4.80 15,898 28.84 0.0717
2019-11-14 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 44,477 82 0.18 12,339 -11.19 0.0594
2019-08-14 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 44,395 -8,748 -16.46 13,894 -36.33 0.0682
2019-05-15 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 53,143 -79,331 -59.88 21,823 -55.81 0.1180
2019-02-13 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 132,474 3,934 3.06 49,389 -4.94 0.1177
2018-11-14 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 128,540 479 0.37 51,954 17.68 0.1066
2018-08-14 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 128,061 6,668 5.49 44,149 5.61 0.0965
2018-05-14 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 121,393 -235 -0.19 41,803 -8.69 0.0941
2018-02-14 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 121,628 580 0.48 45,780 -15.30 0.1010
2017-11-14 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 121,048 287 0.24 54,052 -9.04 0.1269
2017-08-14 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 120,761 -1,309 -1.07 59,421 25.64 0.1517
2017-05-11 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 122,070 -10,576 -7.97 47,296 -3.00 0.1242
2017-05-02 2016-12-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 132,646 87,315 192.62 48,760 164.78 0.1246
2017-02-13 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 132,646 48,760
2016-11-07 2016-09-30 13F REGENERON PHARMACEUTICALS Com 75886F107 45,331 -2,991 -6.19 18,415 9.54 0.2736
2016-08-03 2016-06-30 13F REGENERON PHARMACEUTICALS Com 75886F107 48,322 7,939 19.66 16,811 15.74 0.2522
2016-05-05 2016-03-31 13F REGENERON PHARMACEUTICALS Com 75886F107 40,383 2,526 6.67 14,525 -30.23 0.2120
2016-01-28 2015-12-31 13F REGENERON PHARMACEUTICALS Com 75886F107 37,857 -5,472 -12.63 20,819 6.24 0.3107
2015-11-12 2015-09-30 13F REGENERON PHARMACEUTICALS Com 75886F107 43,329 -4,458 -9.33 19,597 -18.81 0.2982
2015-08-06 2015-06-30 13F REGENERON PHARMACEUTICALS Com 75886F107 47,787 -4,931 -9.35 24,138 -0.35 0.3345
2015-05-11 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 52,718 11,394 27.57 24,223 41.69 0.2991
2015-02-09 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 41,324 -11,804 -22.22 17,096 -9.78 0.2219
2014-11-05 2014-09-30 13F REGENERON PHARMACEUTICALS Com 75886F107 53,128 41,710 365.30 18,949 496.63 0.2617
2014-08-12 2014-06-30 13F REGENERON PHARMACEUTICALS Com 75886F107 11,418 350 3.16 3,176 -4.37 0.0474
2014-05-05 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,068 -72 -0.65 3,321 7.72 0.0523
2014-02-05 2013-12-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 11,140 -1,856 -14.28 3,083 -22.63 0.0478
2014-01-29 2013-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,140 3,083
2014-02-05 2013-09-30 13F/A-1 REGENERON PHARMACEUTICALS Com 75886F107 12,996 101 0.78 3,985 32.13 0.0600
2013-11-06 2013-09-30 13F REGENERON PHARMACEUTICALS Com 75886F107 12,996 3,985
2014-02-12 2013-06-30 13F/A-1 REGENERON PHARMACEUTICALS Com 75886F107 12,895 12,895 3,016 0.0490
2013-08-05 2013-06-30 13F REGENERON PHARMACEUTICALS Com 75886F107 12,895 3,016
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.