Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionWelch Group, LLC
Latest Disclosed Ownership849 shares
Latest Disclosed Value $ 655,972
Welch Group, LLC reports 143.27% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On April 21, 2026 - Welch Group, LLC filed a 13F-HR form disclosing ownership of 849 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $655,972 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 349 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 143.27% 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.

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)
2026-04-21 2026-03-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 849 500 143.27 656 143.49 0.0246
2026-01-26 2025-12-31 13F REGENERON PHARMACEUTICALS COMMON STOCK 75886F107 349 -9 -2.51 269 33.83 0.0104
2025-10-14 2025-09-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 358 358 201 0.0079
2025-07-25 2025-06-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 0 -345 -100.00 0 -100.00
2025-04-08 2025-03-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 345 -23 -6.25 220 -15.12 0.0097
2025-01-27 2024-12-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 368 8 2.22 259 -31.75 0.0116
2024-10-24 2024-09-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 360 150 71.43 378 71.82 0.0165
2024-07-17 2024-06-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 210 -203 -49.15 221 -44.58 0.0106
2024-04-09 2024-03-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 413 3 0.73 398 10.58 0.0197
2024-01-23 2023-12-31 13F REGENERON PHARMACEUTICALS Common 75886F107 410 140 51.85 360 61.71 0.0194
2023-10-18 2023-09-30 13F REGENERON PHARMACEUTICALS Common 75886F107 270 270 222 0.0132
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.