Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionWoodstock Corp
Latest Disclosed Ownership19,855 shares
Latest Disclosed Value $ 15,340,767
Woodstock Corp reports 6.48% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On April 8, 2026 - Woodstock Corp filed a 13F-HR form disclosing ownership of 19,855 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $15,340,767 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 14, 2026 disclosing 18,646 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 6.48% 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 COMMON STOCK 75886F107 19,855 1,209 6.48 15,341 6.59 1.3655
2026-01-14 2025-12-31 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 18,646 2,036 12.26 14,392 54.11 1.2351
2025-10-07 2025-09-30 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 16,610 8,589 107.08 9,339 121.78 0.8093
2025-07-09 2025-06-30 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 8,021 906 12.73 4,211 -6.67 0.3870
2025-04-09 2025-03-31 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 7,115 2,460 52.85 4,513 36.11 0.4458
2025-01-15 2024-12-31 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 4,655 -505 -9.79 3,316 -38.88 0.3194
2024-10-11 2024-09-30 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 5,160 541 11.71 5,424 11.74 0.5219
2024-07-08 2024-06-30 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 4,619 397 9.40 4,855 19.47 0.4936
2024-04-09 2024-03-31 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 4,222 170 4.20 4,064 14.19 0.4207
2024-01-08 2023-12-31 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 4,052 137 3.50 3,559 10.46 0.4121
2023-10-10 2023-09-30 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 3,915 938 31.51 3,222 50.58 0.4040
2023-07-07 2023-06-30 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 2,977 259 9.53 2,139 -4.21 0.2524
2023-04-06 2023-03-31 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 2,718 47 1.76 2,233 15.88 0.2848
2023-01-10 2022-12-31 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 2,671 -31 -1.15 1,927 3.55 0.2561
2022-10-11 2022-09-30 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 2,702 242 9.84 1,861 27.99 0.2769
2022-07-11 2022-06-30 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 2,460 23 0.94 1,454 -14.57 0.2018
2022-04-07 2022-03-31 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 2,437 125 5.41 1,702 16.58 0.1993
2022-01-07 2021-12-31 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 2,312 199 9.42 1,460 14.15 0.1529
2021-10-05 2021-09-30 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 2,113 1,044 97.66 1,279 114.24 0.1492
2021-07-06 2021-06-30 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 1,069 436 68.88 597 99.67 0.0702
2021-04-05 2021-03-31 13F Regeneron Pharmaceuticals COMMON STOCK 75886F107 633 633 299 0.0380
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.