Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionSlow Capital, Inc.
Latest Disclosed Ownership11,217 shares
Latest Disclosed Value $ 8,666,490
Slow Capital, Inc. reports 2.77% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On April 24, 2026 - Slow Capital, Inc. filed a 13F-HR form disclosing ownership of 11,217 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $8,666,490 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 11,536 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -2.77% 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)
2026-04-24 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,217 -319 -2.77 8,666 -2.66 1.1255
2026-01-26 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,536 -1,002 -7.99 8,904 26.28 1.0633
2025-10-29 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 12,538 129 1.04 7,050 8.23 0.8284
2025-07-23 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 12,409 -7,071 -36.30 6,515 -47.27 0.7979
2025-05-02 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 19,480 6,715 52.60 12,355 35.88 1.6541
2025-01-22 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 12,765 410 3.32 9,093 -30.00 1.2871
2024-10-18 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 12,355 241 1.99 12,988 2.01 1.9897
2024-07-24 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 12,114 74 0.61 12,732 9.87 2.0611
2024-04-17 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 12,040 196 1.65 11,588 11.40 1.8569
2024-01-31 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,844 47 0.40 10,402 7.15 1.8100
2023-10-19 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 11,797 208 1.79 9,708 16.58 1.7825
2023-08-09 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 11,589 -167 -1.42 8,327 -13.79 1.4450
2023-04-26 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,756 150 1.29 9,660 15.36 1.8069
2023-02-13 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,606 307 2.72 8,374 7.57 1.8634
2022-10-27 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 11,299 1,118 10.98 7,784 29.35 1.6822
2022-07-28 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 10,181 3,040 42.57 6,018 20.67 1.4612
2022-05-02 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 7,141 3,179 80.24 4,987 99.32 0.9315
2022-02-08 2021-12-31 13F Regeneron Pharmaceuticals COM 75886F107 3,962 533 15.54 2,502 20.58 0.4276
2021-10-21 2021-09-30 13F Regeneron Pharmaceuticals COM 75886F107 3,429 -346 -9.17 2,075 -1.57 0.3804
2021-07-29 2021-06-30 13F Regeneron Pharmaceuticals COM 75886F107 3,775 251 7.12 2,108 11.24 0.3986
2021-05-20 2021-03-31 13F/A-1 Regeneron Pharmaceuticals COM 75886F107 3,524 897 34.15 1,895 49.33 0.4112
2021-05-05 2021-03-31 13F Regeneron Pharmaceuticals COM 75886F107 2,176 -451 1,030 0.2508
2021-02-11 2020-12-31 13F Regeneron Pharmaceuticals COM 75886F107 2,627 242 10.15 1,269 -4.94 0.3034
2020-11-04 2020-09-30 13F Regeneron Pharmaceuticals COM 75886F107 2,385 80 3.47 1,335 -7.16 0.3637
2020-08-10 2020-06-30 13F Regeneron Pharmaceuticals COM 75886F107 2,305 -67 -2.82 1,438 24.18 0.4222
2020-05-12 2020-03-31 13F Regeneron Pharmaceuticals COM 75886F107 2,372 288 13.82 1,158 48.08 0.4372
2020-02-14 2019-12-31 13F Regeneron Pharmaceuticals COM 75886F107 2,084 1,153 123.85 782 203.10 0.2418
2019-11-06 2019-09-30 13F Regeneron Pharmaceuticals COM 75886F107 931 931 258 0.0912
2019-07-31 2019-06-30 13F Regeneron Pharmaceuticals COM 75886F107 0 -2,213 -100.00 0 -100.00
2019-05-16 2019-03-31 13F Regeneron Pharmaceuticals COM 75886F107 2,213 42 1.93 909 12.08 0.3615
2019-01-30 2018-12-31 13F Regeneron Pharmaceuticals COM 75886F107 2,171 304 16.28 811 7.56 0.3904
2018-11-14 2018-09-30 13F Regeneron Pharmaceuticals COM 75886F107 1,867 60 3.32 754 21.03 0.3357
2018-08-14 2018-06-30 13F Regeneron Pharms COM 75886F107 1,807 -308 -14.56 623 -14.42 0.3159
2018-05-11 2018-03-31 13F Regeneron Pharms COM 75886F107 2,115 638 43.20 728 31.17 0.3270
2018-02-15 2017-12-31 13F Regeneron Pharms COM 75886F107 1,477 1,477 555 0.2877
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.