Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionGuggenheim Capital Llc
Latest Disclosed Ownership42,909 shares
Latest Disclosed Value $ 33,153,209
Guggenheim Capital Llc reports 4.47% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 15, 2026 - Guggenheim Capital Llc filed a 13F-HR form disclosing ownership of 42,909 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $33,153,209 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 44,918 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -4.47% 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.

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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 42,909 -2,009 -4.47 33,153 -4.38 0.1281
2026-02-17 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 44,918 2,610 6.17 34,671 45.75 0.2483
2025-11-13 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 42,308 2,076 5.16 23,789 12.63 0.1726
2025-08-13 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 40,232 7,166 21.67 21,122 0.72 0.1676
2025-05-14 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 33,066 -4,547 -12.09 20,971 -21.73 0.1926
2025-02-13 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 37,613 -751 -1.96 26,793 -33.57 0.2172
2024-11-13 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 38,364 -5,228 -11.99 40,330 -11.98 0.2822
2024-08-14 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 43,592 2,239 5.41 45,816 15.11 0.3249
2024-05-14 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 41,353 -1,591 -3.70 39,802 5.53 0.2804
2024-02-14 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 42,944 3,403 8.61 37,717 15.91 0.2850
2023-11-14 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 39,541 913 2.36 32,541 17.24 0.2798
2023-08-11 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 38,628 -3,337 -7.95 27,756 -19.51 0.2179
2023-05-11 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 41,965 -8,087 -16.16 34,481 -4.52 0.2902
2023-02-14 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 50,052 -4,463 -8.19 36,112 -3.84 0.3172
2022-11-14 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 54,515 -8,197 -13.07 37,554 1.30 0.3439
2022-08-15 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 62,712 -4,079 -6.11 37,071 -20.53 0.2926
2022-05-16 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 66,791 -10,846 -13.97 46,649 -4.85 0.2806
2022-02-14 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 77,637 7,166 10.17 49,029 14.96 0.2557
2021-11-15 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 70,471 -8,973 -11.29 42,649 -3.88 0.2561
2021-08-13 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 79,444 11,343 16.66 44,372 37.72 0.2612
2021-05-13 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 68,101 2,951 4.53 32,220 2.37 0.2115
2021-02-16 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 65,150 -70 -0.11 31,475 -13.79 0.1974
2020-11-13 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 65,220 -4,481 -6.43 36,509 -16.01 0.2642
2020-08-14 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 69,701 -5,619 -7.46 43,469 18.19 0.3363
2020-06-02 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 75,320 -14,185 -15.85 36,778 9.44 0.3704
2020-02-20 2019-12-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 89,505 706 0.80 33,606 36.43 0.2524
2020-02-14 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 89,505 706 33,606 199,176.0444
2020-02-20 2019-09-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 88,799 18,763 26.79 24,633 12.37 0.1969
2019-11-14 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 88,799 18,763 24,633 180,517.8495
2019-08-14 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 70,036 2,808 4.18 21,921 -20.59 0.1784
2019-05-15 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 67,228 6,107 9.99 27,606 20.93 0.2250
2019-02-14 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 61,121 -10,401 -14.54 22,828 -21.00 0.1934
2018-11-14 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 71,522 -2,416 -3.27 28,898 13.31 0.1883
2018-08-14 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 73,938 -145,747 -66.34 25,504 -66.29 0.1702
2018-05-15 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 219,685 2,352 1.08 75,651 -7.41 0.1845
2018-02-14 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 217,333 56,829 35.41 81,707 13.85 0.1936
2017-11-14 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 160,504 297 0.19 71,765 -8.79 0.1686
2017-08-14 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 160,207 -9,524 -5.61 78,683 19.63 0.2084
2017-05-15 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 169,731 5,743 3.50 65,774 9.26 0.1783
2017-02-14 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 163,988 -40,848 -19.94 60,198 -26.90 0.1722
2016-11-14 2016-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 204,836 5,594 2.81 82,347 18.35 0.2562
2016-08-15 2016-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 199,242 7,906 4.13 69,581 0.89 0.2185
2016-05-16 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 191,336 -15,640 -7.56 68,965 -38.62 0.2176
2016-02-16 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 206,976 -60,888 -22.73 112,361 -9.82 0.3269
2015-11-16 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 267,864 -1,258 -0.47 124,594 -9.25 0.3834
2015-08-14 2015-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 269,122 3,768 1.42 137,287 14.59 0.3389
2015-05-18 2015-03-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 265,354 26,365 11.03 119,803 22.19 0.2836
2015-05-15 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 265,354 119,803
2015-02-17 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 238,989 -8,526 -3.44 98,045 9.88 0.2460
2014-11-14 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 247,515 1,467 0.60 89,233 28.39 0.2152
2014-08-14 2014-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 246,048 -58,996 -19.34 69,500 -24.13 0.1758
2014-05-16 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 305,044 91,544 42.88 91,599 55.88 0.2605
2014-02-14 2013-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 213,500 -6,635 -3.01 58,764 -14.68 0.1786
2013-11-14 2013-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 220,135 18,610 9.23 68,874 51.98 0.2473
2013-08-22 2013-06-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 201,525 201,525 45,319 0.1906
2013-08-14 2013-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 201,525 45,319 0.1911
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.