Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionRussell Investments Group, Ltd.
Latest Disclosed Ownership228,086 shares
Latest Disclosed Value $ 175,718,822
Russell Investments Group, Ltd. reports 3.16% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 8, 2026 - Russell Investments Group, Ltd. filed a 13F-HR form disclosing ownership of 228,086 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $175,718,822 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 221,090 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 3.16% 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 Common Stock 75886F107 228,086 6,996 3.16 175,719 2.93 0.1888
2026-02-17 2025-12-31 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 221,090 -7,738 -3.38 170,720 32.74 0.1859
2025-11-13 2025-09-30 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 228,828 55,019 31.65 128,608 41.12 0.1460
2025-08-13 2025-06-30 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 173,809 27,069 18.45 91,138 -2.09 0.1161
2025-05-13 2025-03-31 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 146,740 9,532 6.95 93,079 -4.72 0.1279
2025-02-13 2024-12-31 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 137,208 7,944 6.15 97,690 -28.09 0.1349
2024-11-13 2024-09-30 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 129,264 2,516 1.99 135,845 1.97 0.1967
2024-08-08 2024-06-30 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 126,748 -1,763 -1.37 133,215 7.68 0.2146
2024-05-08 2024-03-31 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 128,511 7,481 6.18 123,710 16.36 0.1952
2024-02-05 2023-12-31 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 121,030 -5,171 -4.10 106,318 2.28 0.1892
2023-11-13 2023-09-30 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 126,201 352 0.28 103,946 15.05 0.2058
2023-08-10 2023-06-30 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 125,849 -2,653 -2.06 90,352 -14.36 0.1743
2023-05-09 2023-03-31 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 128,502 -6,275 -4.66 105,499 8.50 0.2070
2023-02-08 2022-12-31 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 134,777 -32,205 -19.29 97,238 -15.53 0.2002
2022-11-04 2022-09-30 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 166,982 6,369 3.97 115,109 20.97 0.2530
2022-07-29 2022-06-30 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 160,613 -26,577 -14.20 95,157 -27.09 0.1941
2022-05-05 2022-03-31 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 187,190 -24,865 -11.73 130,506 -2.92 0.2270
2022-01-21 2021-12-31 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 212,055 6,112 2.97 134,425 7.79 0.2148
2021-11-08 2021-09-30 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 205,943 17,105 9.06 124,711 18.98 0.2107
2021-08-04 2021-06-30 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 188,838 24,724 15.07 104,818 35.21 0.1753
2021-05-10 2021-03-31 13F Regeneron Pharmaceuticals Common Stock 75886F107 164,114 33,307 25.46 77,522 22.88 0.1371
2021-02-08 2020-12-31 13F Regeneron Pharmaceuticals Common Stock 75886F107 130,807 3,964 3.13 63,089 -11.59 0.1249
2020-11-09 2020-09-30 13F Regeneron Pharmaceuticals Common Stock 75886F107 126,843 -9,649 -7.07 71,356 -15.84 0.1536
2020-08-05 2020-06-30 13F Regeneron Pharmaceuticals Common Stock 75886F107 136,492 16,325 13.59 84,783 44.62 0.1890
2020-05-06 2020-03-31 13F/A-1 Regeneron Pharmaceuticals Common Stock 75886F107 120,167 6,783 5.98 58,626 37.74 0.1519
2020-05-06 2020-03-31 13F Regeneron Pharmaceuticals Common Stock 75886F107 120,167 6,783 58,626 32,019.1881
2020-01-29 2019-12-31 13F Regeneron Pharmaceuticals Common Stock 75886F107 113,384 -45,670 -28.71 42,564 -3.49 0.0793
2019-11-01 2019-09-30 13F Regeneron Pharmaceuticals Common Stock 75886F107 159,054 61,276 62.67 44,104 44.16 0.0856
2019-08-09 2019-06-30 13F Regeneron Pharmaceuticals Common Stock 75886F107 97,778 -20,747 -17.50 30,593 -37.11 0.0571
2019-05-13 2019-03-31 13F Regeneron Pharmaceuticals Common Stock 75886F107 118,525 28,802 32.10 48,643 45.51 0.0899
2019-02-11 2018-12-31 13F Regeneron Pharmaceuticals Common Stock 75886F107 89,723 -16,945 -15.89 33,429 -22.46 0.0748
2018-10-26 2018-09-30 13F Regeneron Pharmaceuticals Common Stock 75886F107 106,668 18,742 21.32 43,112 42.24 0.0817
2018-08-08 2018-06-30 13F REGENERON PHARMACEUTICALS Common Stock 75886F107 87,926 -95,630 -52.10 30,310 -51.74 0.0632
2018-05-11 2018-03-31 13F REGENERON PHARMACEUTICALS COM Common Stocks 75886F107 183,556 14,776 8.75 62,805 -2.77 0.1063
2018-02-06 2017-12-31 13F REGENERON PHARMACEUTICALS COM Common Stocks 75886F107 168,780 4,084 2.48 64,592 -12.25 0.1083
2017-11-07 2017-09-30 13F REGENERON PHARMACEUTICALS COM Common Stocks 75886F107 164,696 18,443 12.61 73,610 2.36 0.1258
2017-07-25 2017-06-30 13F REGENERON PHARMACEUTICALS COM Common Stocks 75886F107 146,253 -8,844 -5.70 71,912 19.62 0.1277
2017-04-26 2017-03-31 13F REGENERON PHARMACEUTICALS COM Common Stocks 75886F107 155,097 13,539 9.56 60,115 13.65 0.1103
2017-01-23 2016-12-31 13F REGENERON PHARMACEUTICALS COM Common Stocks 75886F107 141,558 141,558 52,895 0.1033
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.