Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionJanney Montgomery Scott LLC
Latest Disclosed Ownership13,078 shares
Latest Disclosed Value $ 10,105
Janney Montgomery Scott LLC reports 16.42% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On April 22, 2026 - Janney Montgomery Scott LLC filed a 13F-HR form disclosing ownership of 13,078 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $10,105 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 11,233 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 16.42% 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)
2026-04-22 2026-03-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 13,078 1,845 16.42 10 25.00 0.0250
2026-02-11 2025-12-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 11,233 -4,533 -28.75 9 0.00 0.0199
2025-10-27 2025-09-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 15,766 3,176 25.23 9 33.33 0.0210
2025-07-17 2025-06-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 12,590 -15,452 -55.10 7 -64.71 0.0173
2025-04-17 2025-03-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 28,042 4,976 21.57 18 6.25 0.0504
2025-01-17 2024-12-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 23,066 4,130 21.81 16 -15.79 0.0455
2024-10-29 2024-09-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 18,936 -1,073 -5.36 20 -9.52 0.0556
2024-07-25 2024-06-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 20,009 -6,898 -25.64 21 -16.00 0.0641
2024-05-01 2024-03-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 26,907 2,593 10.66 26 19.05 0.0770
2024-02-08 2023-12-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 24,314 6,485 36.37 21 50.00 0.0693
2023-11-08 2023-09-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 17,829 1,216 7.32 15 27.27 0.0547
2023-07-26 2023-06-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 16,613 1,144 7.40 12 -8.33 0.0416
2023-04-28 2023-03-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 15,469 10,163 191.54 13 300.00 0.0519
2023-02-01 2022-12-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 5,306 1,299 32.42 4 -99.89 0.0149
2022-10-25 2022-09-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 4,007 -2,072 -34.08 2,760 -23.61 0.0118
2022-08-03 2022-06-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 6,079 -15,723 -72.12 3,613 -76.27 0.0163
2022-05-04 2022-03-31 13F PFIZER Common Stock 75886F107 21,802 -2,165 -9.03 15,227 0.60 0.0651
2022-01-27 2021-12-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 23,967 -2,766 -10.35 15,136 -6.44 0.0587
2021-10-29 2021-09-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 26,733 813 3.14 16,178 11.75 0.0692
2021-07-26 2021-06-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 25,920 1,697 7.01 14,477 26.32 0.0638
2021-04-27 2021-03-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 24,223 13,693 130.04 11,461 125.30 0.0557
2021-01-25 2020-12-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 10,530 -1,947 -15.60 5,087 -27.16 0.0246
2020-11-06 2020-09-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 12,477 2,521 25.32 6,984 12.48 0.0398
2020-07-23 2020-06-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 9,956 1,707 20.69 6,209 54.15 0.0392
2020-04-30 2020-03-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 8,249 1,348 19.53 4,028 55.46 0.0319
2020-01-21 2019-12-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 6,901 3,988 136.90 2,591 220.67 0.0170
2019-10-29 2019-09-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 2,913 -5,363 -64.80 808 -68.80 0.0059
2019-07-29 2019-06-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 8,276 -695 -7.75 2,590 -29.70 0.0199
2019-04-30 2019-03-31 13F/A-1 REGENERON PHARMACEUTICAL Common Stock 75886F107 8,971 3,949 78.63 3,684 96.38 0.0303
2019-04-30 2019-03-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 5,022 0 1,876
2019-02-01 2018-12-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 5,022 -594 -10.58 1,876 -17.32 0.0181
2018-11-05 2018-09-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 5,616 1,075 23.67 2,269 44.80 0.0195
2018-07-24 2018-06-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 4,541 336 7.99 1,567 8.22 0.0151
2018-04-19 2018-03-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 4,205 -542 -11.42 1,448 -18.88 0.0146
2018-02-14 2017-12-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 4,747 32 0.68 1,785 -15.32 0.0185
2017-11-15 2017-09-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 4,715 -1,562 -24.88 2,108 -31.63 0.0240
2017-07-27 2017-06-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 6,277 1,628 35.02 3,083 71.09 0.0385
2017-04-26 2017-03-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 4,649 2,009 76.10 1,802 85.96 0.0240
2017-02-13 2016-12-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 2,640 813 44.50 969 32.02 0.0146
2016-11-14 2016-09-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 1,827 -536 -22.68 734 -42.79 0.0129
2016-08-05 2016-06-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 2,363 1,377 139.66 1,283 261.41 0.0203
2016-05-10 2016-03-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 986 -1,377 -58.27 355 -72.33 0.0093
2016-02-19 2015-12-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 2,363 -416 -14.97 1,283 -0.77 0.0331
2015-11-16 2015-09-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 2,779 -226 -7.52 1,293 -15.60 0.0365
2015-08-04 2015-06-30 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 3,005 164 5.77 1,533 19.41 0.0321
2015-05-12 2015-03-31 13F/A-1 REGENERON PHARMACEUTICAL Common Stock 75886F107 2,841 2,094 280.32 1,283 319.28 0.0239
2015-04-30 2015-03-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 2,841 1,283
2015-02-10 2014-12-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 747 -149 -16.63 306 13.75 0.0061
2014-05-14 2014-03-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 896 -436 -32.73 269 -26.50 0.0065
2014-02-19 2013-12-31 13F REGENERON PHARMACEUTICAL Common Stock 75886F107 1,332 1,332 367 0.0097
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.