Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionJohn G Ullman & Associates Inc
Latest Disclosed Ownership910 shares
Latest Disclosed Value $ 703,102
John G Ullman & Associates Inc reports 50.27% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 6, 2026 - John G Ullman & Associates Inc filed a 13F-HR form disclosing ownership of 910 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $703,102 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 1,830 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -50.27% 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)
2026-05-06 2026-03-31 13F REGENERON PHARMS COM 75886F107 910 -920 -50.27 703 -50.21 0.0932
2026-02-05 2025-12-31 13F REGENERON PHARMS COM 75886F107 1,830 -125 -6.39 1,413 28.48 0.1883
2025-11-05 2025-09-30 13F REGENERON PHARMS COM 75886F107 1,955 550 39.15 1,099 49.12 0.1480
2025-07-29 2025-06-30 13F REGENERON PHARMS COM 75886F107 1,405 -5,025 -78.15 738 -81.93 0.1095
2025-05-06 2025-03-31 13F REGENERON PHARMS COM 75886F107 6,430 3,115 93.97 4,078 72.72 0.6290
2025-02-05 2024-12-31 13F REGENERON PHARMS COM 75886F107 3,315 3,315 2,361 0.3474
2023-05-05 2023-03-31 13F REGENERON PHARMS COM 75886F107 0 -4,260 -100.00 0 -100.00
2023-02-08 2022-12-31 13F REGENERON PHARMS COM 75886F107 4,260 -130 -2.96 3 -99.90 0.4901
2022-10-19 2022-09-30 13F REGENERON PHARMS COM 75886F107 4,390 -60 -1.35 3,024 14.94 0.5291
2022-07-27 2022-06-30 13F REGENERON PHARMS COM 75886F107 4,450 3,650 456.25 2,631 370.66 0.4222
2022-04-29 2022-03-31 13F REGENERON PHARMS COM 75886F107 800 0 0.00 559 10.69 0.0775
2022-01-26 2021-12-31 13F REGENERON PHARMS COM 75886F107 800 0 0.00 505 4.34 0.0695
2021-11-02 2021-09-30 13F REGENERON PHARMS COM 75886F107 800 0 0.00 484 8.28 0.0658
2021-07-23 2021-06-30 13F REGENERON PHARMS COM 75886F107 800 0 0.00 447 17.94 0.0582
2021-04-22 2021-03-31 13F REGENERON PHARMS COM 75886F107 800 0 0.00 379 -1.81 0.0508
2021-02-05 2020-12-31 13F REGENERON PHARMS COM 75886F107 800 0 0.00 386 -13.84 0.0598
2020-11-06 2020-09-30 13F REGENERON PHARMS COM 75886F107 800 0 0.00 448 -10.22 0.0927
2020-07-29 2020-06-30 13F REGENERON PHARMS COM 75886F107 800 0 0.00 499 27.62 0.1218
2020-04-14 2020-03-31 13F REGENERON PHARMS COM 75886F107 800 0 0.00 391 30.33 0.1037
2020-01-29 2019-12-31 13F REGENERON PHARMS COM 75886F107 800 -25 -3.03 300 31.00 0.0516
2019-10-21 2019-09-30 13F REGENERON PHARMS COM 75886F107 825 -75 -8.33 229 -18.79 0.0416
2019-08-02 2019-06-30 13F REGENERON PHARMS COM 75886F107 900 0 0.00 282 -23.78 0.0496
2019-04-30 2019-03-31 13F REGENERON PHARMS COM 75886F107 900 0 0.00 370 10.12 0.0670
2019-01-29 2018-12-31 13F REGENERON PHARMS COM 75886F107 900 0 0.00 336 -7.69 0.0678
2018-11-02 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 900 0 0.00 364 17.42 0.0662
2018-07-23 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 900 0 0.00 310 0.00 0.0586
2018-04-19 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 900 0 0.00 310 -8.28 0.0599
2018-01-31 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 900 0 0.00 338 -15.92 0.0674
2017-11-03 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 900 0 0.00 402 -9.05 0.0784
2017-07-26 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 900 -50 -5.26 442 20.11 0.0877
2017-04-25 2017-03-31 13F REGENERON PHARMACEUTICALS REGN COM 75886F107 950 0 0.00 368 5.44 0.0761
2017-01-20 2016-12-31 13F REGENERON PHARMACEUTICALS REGN COM 75886F107 950 50 5.56 349 -3.59 0.0731
2016-10-20 2016-09-30 13F REGENERON PHARMACEUTICALS REGN COM 75886F107 900 -100 -10.00 362 3.72 0.0744
2016-07-22 2016-06-30 13F REGENERON PHARMACEUTICALS REGN COM 75886F107 1,000 0 0.00 349 -3.06 0.0717
2016-04-27 2016-03-31 13F REGENERON PHARMACEUTICALS REGN COM 75886F107 1,000 -41 -3.94 360 -36.28 0.0845
2016-02-11 2015-12-31 13F REGENERON PHARMACEUTICALS REGN COM 75886F107 1,041 -10 -0.95 565 15.54 0.1248
2015-10-23 2015-09-30 13F/A-1 REGENERON PHARMACEUTICALS REGN COM 75886F107 1,051 -110 -9.47 489 -17.40 0.1160
2015-10-21 2015-09-30 13F REGENERON PHARMACEUTICALS REGN COM 75886F107 1,161 592
2015-08-11 2015-06-30 13F REGENERON PHARMACEUTICALS REGN COM 75886F107 1,161 -90 -7.19 592 4.78 0.1114
2015-05-13 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,251 0 0.00 565 10.14 0.1074
2015-01-26 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,251 -14 -1.11 513 12.50 0.0966
2014-11-12 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,265 0 0.00 456 27.73 0.0877
2014-07-18 2014-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,265 0 0.00 357 -6.05 0.0652
2014-05-07 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,265 -100 -7.33 380 1.06 0.0704
2014-02-03 2013-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,365 -200 -12.78 376 -23.27 0.0718
2013-11-04 2013-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,565 -50 -3.10 490 34.99 0.0998
2013-08-14 2013-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,615 1,615 363 0.0758
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.