Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionWoodline Partners LP
Latest Disclosed Ownership67,751 shares
Latest Disclosed Value $ 52,347,133
Woodline Partners LP reports 4.28% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 15, 2026 - Woodline Partners LP filed a 13F-HR/A form disclosing ownership of 67,751 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $52,347,133 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 64,968 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 4.28% 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/A-1 REGENERON PHARMACEUTICALS COM 75886F107 67,751 2,783 4.28 52,347 4.39 0.1980
2026-05-15 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 67,751 2,783 52,347 0.1979
2026-02-17 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 64,968 4,004 6.57 50,147 46.29 0.1943
2025-11-14 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 60,964 2,186 3.72 34,278 11.08 0.1614
2025-08-14 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 58,778 -47,439 -44.66 30,858 -54.19 0.1630
2025-05-15 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 106,217 2,938 2.84 67,366 -8.43 0.4381
2025-02-14 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 103,279 3,862 3.88 73,569 -29.61 0.4973
2024-11-14 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 99,417 -82,480 -45.34 104,511 -45.33 0.8802
2024-08-14 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 181,897 11,295 6.62 191,179 16.43 1.8248
2024-05-15 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 170,602 512 0.30 164,203 9.92 1.5114
2024-02-14 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 170,090 33,518 24.54 149,388 32.92 1.6246
2023-11-14 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 136,572 88,910 186.54 112,393 228.18 1.3177
2023-08-14 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 47,662 -106,659 -69.12 34,247 -72.99 0.4059
2023-05-15 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 154,321 -5,172 -3.24 126,801 10.19 1.7251
2023-02-14 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 159,493 -27,864 -14.87 115,073 -10.84 1.5396
2022-11-14 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 187,357 134,565 254.90 129,065 313.58 1.8036
2022-08-15 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 52,792 -52,702 -49.96 31,207 -57.64 0.4809
2022-05-16 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 105,494 15,248 16.90 73,679 29.28 1.1960
2022-02-14 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 90,246 14,400 18.99 56,992 24.17 0.8164
2021-11-15 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 75,846 -2,013 -2.59 45,900 5.55 0.7495
2021-08-16 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 77,859 -108,040 -58.12 43,487 -50.56 0.8109
2021-05-17 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 185,899 165,695 820.11 87,956 801.10 1.9510
2021-02-16 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 20,204 20,204 9,761 0.2588
2020-11-16 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -30,722 -100.00 0 -100.00
2020-08-14 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 30,722 3,245 11.81 19,160 42.80 0.7590
2020-05-15 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 27,477 27,477 13,417 0.9585
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.