Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionLido Advisors, LLC
Latest Disclosed Ownership11,739 shares
Latest Disclosed Value $ 9,071,357
Lido Advisors, LLC reports 12.51% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 13, 2026 - Lido Advisors, LLC filed a 13F-HR form disclosing ownership of 11,739 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $9,071,357 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 13,417 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -12.51% 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)
2026-05-13 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,739 -1,678 -12.51 9,071 4.63 0.0264
2026-02-10 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 13,417 1,271 10.46 8,671 26.96 0.0259
2025-11-14 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 12,146 6,474 114.14 6,830 129.39 0.0214
2025-08-13 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,672 1,464 34.79 2,978 11.54 0.0116
2025-05-15 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,208 1,894 81.85 2,670 61.95 0.0120
2025-02-14 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,314 201 9.51 1,649 -25.80 0.0075
2024-11-14 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,113 178 9.20 2,222 9.25 0.0111
2024-08-15 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,935 77 4.14 2,034 13.77 0.0113
2024-05-15 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,858 178 10.60 1,788 21.15 0.0105
2024-02-14 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,680 229 15.78 1,476 23.64 0.0100
2023-11-14 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,451 -658 -31.20 1,194 -21.31 0.0091
2023-08-09 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,109 695 49.15 1,516 30.58 0.0108
2023-05-15 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,414 616 77.19 1,162 101.56 0.0113
2023-02-14 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 798 153 23.72 576 29.73 0.0070
2022-11-14 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 645 -12 -1.83 444 14.43 0.0056
2022-08-15 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 657 -226 -25.59 388 -37.01 0.0051
2022-05-17 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 883 228 34.81 616 49.15 0.0069
2022-02-15 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 655 -86 -11.61 413 -7.81 0.0045
2022-02-15 2021-09-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 741 110 17.43 448 26.91 0.0063
2021-11-12 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 741 110 449 0.0058
2021-08-12 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 631 -329 -34.27 353 -22.42 0.0049
2021-05-13 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 960 411 74.86 455 71.70 0.0133
2021-02-08 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 549 -93 -14.49 265 -26.18 0.0089
2020-11-12 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 642 235 57.74 359 41.34 0.0154
2020-08-12 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 407 407 254 0.0124
2019-11-12 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -889 -100.00 0 -100.00
2019-08-14 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 889 11 1.25 278 -22.78 0.0235
2019-05-10 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 878 -11 -1.24 360 8.43 0.0322
2019-02-14 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 889 889 332 0.0459
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.