리제네론 파마슈티컬스, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionBlair William & Co/il
Latest Disclosed Ownership1,364 shares
Latest Disclosed Value $ 1,053,731
Blair William & Co/il reports 5.08% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 8, 2026 - Blair William & Co/il filed a 13F-HR form disclosing ownership of 1,364 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $1,053,731 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,298 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 5.08% 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 1,364 66 5.08 1,054 5.09 0.0030
2026-02-17 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,298 29 2.29 1,002 40.53 0.0027
2025-11-12 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,269 12 0.95 714 8.03 0.0019
2025-07-24 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,257 -25 -1.95 660 -18.82 0.0018
2025-05-09 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,282 27 2.15 813 -8.96 0.0025
2025-02-12 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,255 -788 -38.57 894 -58.41 0.0026
2024-11-12 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,043 58 2.92 2,148 2.92 0.0063
2024-08-12 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,985 -39 -1.93 2,086 7.14 0.0064
2024-05-09 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,024 8 0.40 1,948 10.00 0.0061
2024-02-12 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,016 456 29.23 1,771 37.96 0.0060
2023-11-09 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,560 -225 -12.61 1,284 0.08 0.0049
2023-08-11 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,785 -183 -9.30 1,283 -20.72 0.0047
2023-05-12 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,968 -413 -17.35 1,617 -5.82 0.0065
2023-02-10 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,381 1,133 90.79 1,718 99.65 0.0075
2022-11-09 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,248 121 10.74 860 29.13 0.0039
2022-08-10 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,127 -304 -21.24 666 -33.33 0.0030
2022-05-13 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,431 222 18.36 999 30.76 0.0035
2022-02-14 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,209 -505 -29.46 764 -26.33 0.0024
2021-11-12 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,714 -128 -6.95 1,037 0.78 0.0035
2021-08-12 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,842 59 3.31 1,029 21.92 0.0036
2021-05-13 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,783 532 42.53 844 39.74 0.0032
2021-02-09 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,251 -270 -17.75 604 -29.02 0.0022
2020-11-06 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,521 173 12.83 851 1.19 0.0036
2020-08-12 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,348 138 11.40 841 42.30 0.0040
2020-05-11 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,210 104 9.40 591 42.41 0.0037
2020-02-13 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,106 -367 -24.92 415 1.47 0.0021
2019-11-12 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,473 -184 -11.10 409 -21.19 0.0024
2019-08-13 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,657 50 3.11 519 -21.36 0.0030
2019-05-14 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,607 432 36.77 660 50.34 0.0040
2019-02-14 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,175 20 1.73 439 -6.00 0.0032
2018-11-13 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,155 0 0.00 467 17.34 0.0029
2018-08-13 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,155 -818 -41.46 398 -41.38 0.0027
2018-05-15 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,973 -9 -0.45 679 -8.86 0.0048
2018-02-14 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,982 142 7.72 745 -9.48 0.0051
2017-11-13 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,840 127 7.41 823 -2.14 0.0062
2017-08-04 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,713 79 4.83 841 37.42 0.0063
2017-05-10 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,634 226 16.05 612 18.38 0.0049
2017-02-14 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,408 59 4.37 517 -4.61 0.0046
2016-11-14 2016-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,349 179 15.30 542 32.52 0.0048
2016-08-08 2016-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,170 576 96.97 409 91.12 0.0038
2016-05-16 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 594 -1,489 -71.48 214 -81.08 0.0020
2016-02-16 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,083 1,454 231.16 1,131 287.33 0.0106
2015-11-12 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 629 -49 -7.23 292 -15.36 0.0025
2015-08-03 2015-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 678 -151 -18.21 345 -7.75 0.0005
2015-05-11 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 829 829 0.00 374 0.0006
2015-02-05 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -700 -100.00 0 -100.00
2014-11-04 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 700 -543 -43.68 252 -32.44 0.0004
2014-05-06 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,243 1,243 373 0.0006
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.