Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionFagan Associates, Inc.
Latest Disclosed Ownership13,912 shares
Latest Disclosed Value $ 10,749,084
Fagan Associates, Inc. reports 0.14% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 4, 2026 - Fagan Associates, Inc. filed a 13F-HR form disclosing ownership of 13,912 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $10,749,084 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 30, 2026 disclosing 13,931 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -0.14% 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)
2026-05-04 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 13,912 -19 -0.14 10,749 -0.03 1.4945
2026-01-30 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 13,931 -47 -0.34 10,753 36.81 1.4336
2025-11-14 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 13,978 138 1.00 7,859 8.18 1.0852
2025-08-07 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 13,840 714 5.44 7,266 -12.73 1.1239
2025-05-06 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 13,126 203 1.57 8,325 -9.56 1.3886
2025-02-03 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 12,923 3,832 42.15 9,205 -3.67 1.4624
2024-11-12 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 9,091 28 0.31 9,557 0.33 1.6056
2024-08-09 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 9,063 119 1.33 9,525 10.65 1.6664
2024-05-06 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,944 216 2.47 8,609 12.30 1.6129
2024-02-08 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,728 91 1.05 7,666 7.85 1.6662
2023-10-31 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,637 354 4.27 7,108 19.43 1.7182
2023-08-08 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,283 145 1.78 5,952 -10.99 1.4442
2023-05-04 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,138 178 2.24 6,687 16.42 1.6639
2023-01-26 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 7,960 -131 -1.62 5,743 3.03 1.5313
2022-11-02 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,091 -40 -0.49 5,574 15.96 1.5580
2022-08-03 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,131 -3 -0.04 4,807 -15.38 1.2842
2022-05-06 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,134 192 2.42 5,681 13.26 1.1655
2022-02-08 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 7,942 225 2.92 5,016 7.41 0.9515
2021-11-09 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 7,717 4 0.05 4,670 8.40 1.0148
2021-08-06 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 7,713 244 3.27 4,308 21.90 0.9200
2021-05-06 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 7,469 702 10.37 3,534 8.11 0.8264
2021-02-08 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,767 486 7.74 3,269 -7.03 0.8211
2020-11-02 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,281 578 10.14 3,516 -1.15 1.0065
2020-08-05 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,703 -41 -0.71 3,557 26.81 1.1349
2020-05-05 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 5,744 5,187 931.24 2,805 1,242.11 1.1143
2020-02-07 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 557 557 209 0.0678
2019-07-12 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -550 -100.00 0 -100.00
2019-05-01 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 550 0 0.00 2,260 1,002.44 0.9672
2019-02-05 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 550 0 0.00 205 -7.66 0.1055
2018-11-06 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 550 -55 -9.09 222 6.22 0.0916
2018-08-06 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 605 0 0.00 209 0.48 0.0938
2018-05-08 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 605 0 0.00 208 -8.37 0.0887
2018-02-08 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 605 -2,713 -81.77 227 -84.70 0.0919
2017-11-13 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,318 203 6.52 1,484 -3.01 0.7341
2017-08-07 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,115 226 7.82 1,530 36.61 0.7958
2017-05-09 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,889 54 1.90 1,120 7.59 0.6206
2017-02-02 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,835 1,070 60.62 1,041 46.62 0.6018
2016-11-07 2016-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,765 945 115.24 710 148.25 0.4345
2016-08-05 2016-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 820 20 2.50 286 -0.69 0.1838
2016-05-13 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 800 -10 -1.23 288 -34.55 0.1909
2016-02-08 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 810 75 10.20 440 28.65 0.2925
2015-10-22 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 735 15 2.08 342 -6.81 0.2507
2015-07-28 2015-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 720 -15 -2.04 367 10.54 0.2449
2015-04-24 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 735 735 0.00 332 0.2461
2015-02-02 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -870 -100.00 0 -100.00
2014-11-12 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 870 0 0.00 314 27.64 0.2579
2014-08-11 2014-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 870 35 4.19 246 -1.99 0.2104
2014-05-15 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 835 835 251 0.2174
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.