Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionBaird Financial Group, Inc.
Latest Disclosed Ownership57,589 shares
Latest Disclosed Value $ 44,495,565
Baird Financial Group, Inc. reports 15.48% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 14, 2026 - Baird Financial Group, Inc. filed a 13F-HR form disclosing ownership of 57,589 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $44,495,565 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 49,870 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 15.48% 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)
2026-05-14 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 57,589 7,719 15.48 44,496 15.59 0.0374
2026-02-13 2025-12-31 13F REGENERON PHARMACEUTICALS COM COMMON 75886F107 49,870 1,484 3.07 38,493 41.49 0.0600
2025-11-13 2025-09-30 13F REGENERON PHARMACEUTICAL COMMON 75886F107 48,386 -593 -1.21 27,206 5.81 0.0438
2025-08-13 2025-06-30 13F REGENERON PHARMACEUTICALS COM COMMON 75886F107 48,979 4,383 9.83 25,714 -9.09 0.0451
2025-05-15 2025-03-31 13F REGENERON PHARMACEUTICALS COM COMMON 75886F107 44,596 9,883 28.47 28,284 14.39 0.0545
2025-02-14 2024-12-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 34,713 -1,135 -3.17 24,727 -34.38 0.0473
2024-11-14 2024-09-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 35,848 1,155 3.33 37,685 3.35 0.0732
2024-08-14 2024-06-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 34,693 761 2.24 36,463 11.65 0.0756
2024-05-14 2024-03-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 33,932 71 0.21 32,659 9.82 0.0685
2024-02-14 2023-12-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 33,861 255 0.76 29,740 7.53 0.0678
2023-11-13 2023-09-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 33,606 295 0.89 27,657 15.55 0.0754
2023-08-11 2023-06-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 33,311 1,885 6.00 23,936 -7.30 0.0632
2023-05-15 2023-03-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 31,426 -4,064 -11.45 25,822 103,184.00 0.0637
2023-02-13 2022-12-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 35,490 -24 -0.07 26 -99.90 0.0674
2022-11-15 2022-09-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 35,514 -1,481 -4.00 24,465 11.87 0.0721
2022-08-08 2022-06-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 36,995 466 1.28 21,869 -14.28 0.0607
2022-05-13 2022-03-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 36,529 18,345 100.89 25,513 122.18 0.0630
2022-02-09 2021-12-31 13F REGENERON PHARMACEUTICALS COM COMMON 75886F107 18,184 -1,116 -5.78 11,483 -1.69 0.0268
2021-11-12 2021-09-30 13F REGENERON PHARMACEUTICALS COM COMMON 75886F107 19,300 4,073 26.75 11,680 37.33 0.0299
2021-08-11 2021-06-30 13F REGENERON PHARMACEUTICALS COM COMMON 75886F107 15,227 2,458 19.25 8,505 40.79 0.0221
2021-05-13 2021-03-31 13F REGENERON PHARMACEUTICALS COM COMMON 75886F107 12,769 4,293 50.65 6,041 47.52 0.0169
2021-02-11 2020-12-31 13F REGENERON PHARMACEUTICALS COM COMMON 75886F107 8,476 439 5.46 4,095 -8.96 0.0122
2020-11-12 2020-09-30 13F REGENERON PHARMACEUTICALS COM COMMON 75886F107 8,037 310 4.01 4,498 110.98 0.0154
2020-10-22 2020-06-30 13F/A-1 REGENERON PHARMACEUTICALS COM COMMON 75886F107 7,727 -339 -4.20 2,132 -45.87 0.0080
2020-08-14 2020-06-30 13F REGENERON PHARMACEUTICALS COM COMMON 75886F107 8,530 464 1,819 3,604.8447
2020-05-14 2020-03-31 13F REGENERON PHARMACEUTICALS COM COMMON 75886F107 8,066 -2,033 -20.13 3,939 3.88 0.0180
2020-02-14 2019-12-31 13F REGENERON PHARMACEUTICALS COM COMMON 75886F107 10,099 -3,169 -23.88 3,792 183.83 0.0136
2019-11-14 2019-09-30 13F REGENERON PHARMACEUTICAL Common 75886F107 13,268 -8,199 -38.19 1,336 -80.12 0.0053
2019-08-14 2019-06-30 13F REGENERON PHARMACEUTICAL COMMON 75886F107 21,467 4,766 28.54 6,719 -2.03 0.0261
2019-05-14 2019-03-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 16,701 -412 -2.41 6,858 7.29 0.0401
2019-02-14 2018-12-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 17,113 -317 -1.82 6,392 -7.95 0.0434
2018-11-13 2018-09-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 17,430 -396 -2.22 6,944 12.91 0.0435
2018-08-13 2018-06-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 17,826 779 4.57 6,150 4.77 0.0417
2018-05-14 2018-03-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 17,047 1,297 8.23 5,870 -0.88 0.0413
2018-02-09 2017-12-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 15,750 2,122 15.57 5,922 -2.82 0.0419
2017-11-14 2017-09-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 13,628 -4,018 -22.77 6,094 -29.69 0.0460
2017-08-14 2017-06-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 17,646 610 3.58 8,667 31.30 0.0679
2017-06-19 2017-03-31 13F/A-1 REGENERON PHARMACEUTICALS COMMON 75886F107 17,036 -108 -0.63 6,601 4.89 0.0534
2017-05-09 2017-03-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 17,036 6,601
2017-02-10 2016-12-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 17,144 221 1.31 6,293 -7.50 0.0546
2016-11-10 2016-09-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 16,923 -4,473 -20.91 6,803 -9.09 0.0609
2016-08-11 2016-06-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 21,396 686 3.31 7,483 0.24 0.0686
2016-05-12 2016-03-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 20,710 4,116 24.80 7,465 -17.13 0.0714
2016-02-11 2015-12-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 16,594 1,834 12.43 9,008 31.22 0.0901
2015-11-12 2015-09-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 14,760 -8 -0.05 6,865 -8.88 0.0730
2015-08-14 2015-06-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 14,768 14,768 7,534 0.0741
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.