Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionGabelli Funds Llc
Latest Disclosed Ownership2,197 shares
Latest Disclosed Value $ 1,697,490
Gabelli Funds Llc reports 19.47% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 14, 2026 - Gabelli Funds Llc filed a 13F-HR form disclosing ownership of 2,197 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $1,697,490 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 1,839 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 19.47% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-14 2026-03-31 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 2,197 358 19.47 1,697 19.59 0.0115
2026-02-05 2025-12-31 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 1,839 -27 -1.45 1,419 35.27 0.0096
2025-11-12 2025-09-30 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 1,866 3 0.16 1,049 7.26 0.0071
2025-08-13 2025-06-30 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 1,863 55 3.04 978 -14.66 0.0069
2025-05-14 2025-03-31 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 1,808 -93 -4.89 1,147 -15.36 0.0087
2025-02-13 2024-12-31 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 1,901 -42 -2.16 1,354 -33.69 0.0102
2024-11-13 2024-09-30 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 1,943 50 2.64 2,043 2.66 0.0147
2024-08-13 2024-06-30 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 1,893 34 1.83 1,990 11.18 0.0151
2024-05-14 2024-03-31 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 1,859 54 2.99 1,789 12.87 0.0132
2024-02-13 2023-12-31 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 1,805 255 16.45 1,585 24.31 0.0122
2023-11-08 2023-09-30 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 1,550 0 0.00 1,276 14.56 0.0104
2023-08-10 2023-06-30 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 1,550 0 0.00 1,114 -12.57 0.0084
2023-05-12 2023-03-31 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 1,550 0 0.00 1,274 13.86 0.0097
2023-02-13 2022-12-31 13F REGENERON PHARMACEUTICALS EQUITY 75886F107 1,550 0 0.00 1,118 4.68 0.0087
2022-11-14 2022-09-30 13F/A-1 REGENERON PHARMACEUTICALS COM COM 75886F107 1,550 0 0.00 1,068 16.59 0.0088
2022-11-10 2022-09-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 1,550 0 1,068 0.0088
2022-08-12 2022-06-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 1,550 -282 -15.39 916 -28.44 0.0070
2022-05-18 2022-03-31 13F/A-1 REGENERON PHARMACEUTICALS COM COM 75886F107 1,832 -6,400 -77.75 1,280 -75.38 0.0084
2022-05-13 2022-03-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 1,832 -6,400 1,280 0.0086
2022-02-11 2021-12-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 8,232 -400 -4.63 5,199 -0.48 0.0328
2021-11-12 2021-09-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 8,632 -400 -4.43 5,224 3.55 0.0346
2021-08-13 2021-06-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 9,032 5 0.06 5,045 18.12 0.0321
2021-05-14 2021-03-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 9,027 7,282 417.31 4,271 406.64 0.0286
2021-02-05 2020-12-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 1,745 0 0.00 843 -13.72 0.0060
2020-11-06 2020-09-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 1,745 -25 -1.41 977 -11.50 0.0076
2020-08-13 2020-06-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 1,770 -155 -8.05 1,104 17.45 0.0090
2020-05-14 2020-03-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 1,925 325 20.31 940 56.41 0.0084
2020-02-14 2019-12-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 1,600 -500 -23.81 601 3.09 0.0039
2019-11-01 2019-09-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 2,100 0 0.00 583 -11.26 0.0039
2019-08-02 2019-06-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 2,100 0 0.00 657 -23.78 0.0042
2019-05-02 2019-03-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 2,100 0 0.00 862 9.95 0.0054
2019-01-30 2018-12-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 2,100 -400 -16.00 784 -22.38 0.0054
2018-11-02 2018-09-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 2,500 0 0.00 1,010 17.17 0.0058
2018-08-10 2018-06-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 2,500 700 38.89 862 39.03 0.0051
2018-05-09 2018-03-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 1,800 800 80.00 620 64.89 0.0037
2018-02-02 2017-12-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 1,000 -5,800 -85.29 376 -87.63 0.0022
2017-11-01 2017-09-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 6,800 0 0.00 3,040 -8.98 0.0174
2017-08-03 2017-06-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 6,800 0 0.00 3,340 26.76 0.0198
2017-05-04 2017-03-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 6,800 800 13.33 2,635 19.61 0.0155
2017-02-10 2016-12-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 6,000 0 0.00 2,203 -8.67 0.0130
2016-11-10 2016-09-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 6,000 0 0.00 2,412 15.13 0.0143
2016-08-04 2016-06-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 6,000 1,300 27.66 2,095 23.67 0.0124
2016-05-05 2016-03-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 4,700 -300 -6.00 1,694 -37.58 0.0102
2016-02-05 2015-12-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 5,000 -500 -9.09 2,714 6.10 0.0164
2015-10-23 2015-09-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 5,500 -200 -3.51 2,558 -12.04 0.0152
2015-08-05 2015-06-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 5,700 0 0.00 2,908 13.02 0.0152
2015-05-01 2015-03-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 5,700 -1,200 -17.39 2,573 -9.11 0.0131
2015-02-05 2014-12-31 13F REGENERON PHARMACEUTICALS COM COM 75886F107 6,900 -1,100 -13.75 2,831 -1.84 0.0138
2014-10-30 2014-09-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 8,000 0 0.00 2,884 27.61 0.0146
2014-08-06 2014-06-30 13F REGENERON PHARMACEUTICALS COM COM 75886F107 8,000 8,000 2,260 0.0112
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.