Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionShelton Capital Management
Latest Disclosed Ownership17,487 shares
Latest Disclosed Value $ 13,511,156
Shelton Capital Management reports 2.02% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 15, 2026 - Shelton Capital Management filed a 13F-HR form disclosing ownership of 17,487 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $13,511,156 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 17,847 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -2.02% 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)
2026-05-15 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 17,487 -360 -2.02 13,511 -1.92 0.2955
2026-02-17 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 17,847 2,860 19.08 13,776 63.48 0.2719
2025-11-14 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 14,987 -3,255 -17.84 8,427 -12.02 0.1804
2025-08-13 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 18,242 -236 -1.28 9,577 -18.28 0.2203
2025-05-15 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 18,478 -547 -2.88 11,719 -13.53 0.2792
2025-02-13 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 19,025 -180 -0.94 13,552 -32.87 0.3373
2024-11-14 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 19,205 -2,023 -9.53 20,189 -9.51 0.5183
2024-08-13 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 21,228 226 1.08 22,311 10.37 0.6058
2024-05-15 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 21,002 5,414 34.73 20,214 47.66 0.5740
2024-02-14 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 15,588 3,349 27.36 13,691 35.92 0.4334
2023-11-14 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 12,239 2,720 28.57 10,072 47.27 0.3690
2023-08-10 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 9,519 400 4.39 6,840 -8.72 0.2455
2023-05-11 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 9,119 673 7.97 7,493 22.96 0.3121
2023-02-13 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,446 -1,725 -16.96 6,094 -13.03 0.6382
2022-11-14 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 10,171 218 2.19 7,006 19.07 0.3331
2022-08-11 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 9,953 0 0.00 5,884 -15.35 0.2646
2022-05-12 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 9,953 -1,798 -15.30 6,951 -6.33 0.2567
2022-02-11 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,751 424 3.74 7,421 8.26 0.2626
2021-11-15 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 11,327 -1,580 -12.24 6,855 -4.91 0.2678
2021-08-12 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 12,907 0 0.00 7,209 18.04 0.2721
2021-05-14 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 12,907 4,542 54.30 6,107 51.13 0.2126
2021-02-16 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,365 -4,001 -32.35 4,041 -41.62 0.1816
2020-11-09 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 12,366 3,928 46.55 6,922 31.55 0.2865
2020-08-12 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,438 0 0.00 5,262 27.72 0.2899
2020-05-13 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,438 -165 -1.92 4,120 27.55 0.2986
2020-02-11 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,603 -234 -2.65 3,230 31.78 0.1785
2019-11-13 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,837 -1,400 -13.68 2,451 -23.50 0.1447
2019-08-14 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 10,237 6,329 161.95 3,204 -66.34 0.1846
2019-05-10 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,908 -5,610 -58.94 9,518 167.74 0.0375
2019-01-31 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 9,518 0 0.00 3,555 -7.57 0.2418
2018-11-14 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 9,518 0 0.00 3,846 17.11 0.2194
2018-08-10 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 9,518 0 0.00 3,284 0.18 0.2043
2018-05-15 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 9,518 1,095 13.00 3,278 3.50 0.2150
2018-02-06 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,423 0 0.00 3,167 -15.91 0.2034
2017-11-28 2017-09-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 8,423 0 0.00 3,766 -8.97 0.2542
2017-08-14 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,423 748 9.75 4,137 39.11 0.2923
2017-11-28 2017-03-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 7,675 887 13.07 2,974 19.34 0.2060
2017-05-15 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 14,226 14,226 5,513
2017-11-28 2016-12-31 13F/A-2 REGENERON PHARMACEUTICALS COM 75886F107 6,788 0 0.00 2,492 -8.68 0.1897
2017-12-06 2016-09-30 13F/A-2 REGENERON PHARMACEUTICALS COM 75886F107 6,788 -1 -0.01 2,729 15.10 0.2278
2017-12-04 2016-09-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 6,788 0 2,492 0.1588
2016-08-01 2016-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,789 1 0.01 2,371 -3.11 0.2089
2016-05-13 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,788 601 9.71 2,447 -27.15 0.2215
2016-02-01 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,187 219 3.67 3,359 21.00 0.3248
2015-11-02 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,968 436 7.88 2,776 -1.63 0.3056
2015-08-11 2015-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,532 189 3.54 2,822 17.00 0.2919
2015-05-12 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 5,343 905 20.39 2,412 32.45 0.2606
2015-02-10 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,438 768 20.93 1,821 37.64 0.2121
2014-10-15 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,670 523 16.62 1,323 48.82 0.1778
2014-07-25 2014-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,147 221 7.55 889 1.14 0.1241
2014-04-14 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,926 251 9.38 879 19.43 0.1289
2014-01-22 2013-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,675 114 4.45 736 -8.11 0.1113
2013-10-16 2013-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,561 678 36.01 801 89.36 0.1340
2013-07-10 2013-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,883 1,883 423 0.0772
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.