Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionGrove Bank & Trust
Latest Disclosed Ownership2,015 shares
Latest Disclosed Value $ 1,556,869
Grove Bank & Trust reports 21.90% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On April 8, 2026 - Grove Bank & Trust filed a 13F-HR form disclosing ownership of 2,015 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $1,556,869 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 8, 2026 disclosing 1,653 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 21.90% 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)
2026-04-08 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,015 362 21.90 1,557 22.04 0.1760
2026-01-08 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,653 694 72.37 1,276 136.55 0.1435
2025-10-06 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 959 -148 -13.37 539 -7.23 0.0631
2025-07-11 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,107 297 36.67 581 13.26 0.0725
2025-04-17 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 810 767 1,783.72 514 1,610.00 0.0687
2025-01-16 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 43 8 22.86 31 -16.67 0.0043
2024-10-11 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 35 8 29.63 37 28.57 0.0054
2024-07-24 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 27 0 0.00 28 12.00 0.0046
2024-04-30 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 27 0 0.00 26 8.70 0.0044
2024-01-30 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 27 -42 -60.87 24 -58.93 0.0044
2023-10-30 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 69 15 27.78 57 47.37 0.0116
2023-07-27 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 54 -9 -14.29 39 -25.49 0.0078
2023-05-10 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 63 7 12.50 52 0.0109
2023-02-03 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 56 56 0 0.0088
2021-04-23 2021-03-31 13F REGENERON PHARMACEUTICALS COMMON STOCK 75886F107 0 -1,020 -100.00 0 -100.00
2021-02-03 2020-12-31 13F REGENERON PHARMACEUTICALS COMMON STOCK 75886F107 1,020 21 2.10 493 -11.81 0.1280
2020-10-30 2020-09-30 13F REGENERON PHARMACEUTICALS COMMON STOCK 75886F107 999 151 17.81 559 5.67 0.1712
2020-07-31 2020-06-30 13F REGENERON PHARMACEUTICALS COMMON STOCK 75886F107 848 276 48.25 529 89.61 0.1742
2020-05-05 2020-03-31 13F REGENERON PHARMACEUTICALS COMMON STOCK 75886F107 572 572 279 0.1101
2018-02-02 2017-12-31 13F REGENERON PHARMACEUTICALS COMMON STOCK 75886F107 0 -29 -100.00 0 -100.00
2017-11-13 2017-09-30 13F REGENERON PHARMACEUTICALS COMMON STOCK 75886F107 29 -16 -35.56 13 -40.91 0.0063
2017-07-28 2017-06-30 13F REGENERON PHARMACEUTICALS COMMON STOCK 75886F107 45 29 181.25 22 266.67 0.0141
2017-04-28 2017-03-31 13F REGENERON PHARMACEUTICALS COMMON STOCK 75886F107 16 0 0.00 6 0.00 0.0049
2017-02-03 2016-12-31 13F REGENERON PHARMACEUTICALS COMMON STOCK 75886F107 16 16 6 0.0046
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.