Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionPutnam Fl Investment Management Co
Latest Disclosed Ownership454 shares
Latest Disclosed Value $ 350,779
Putnam Fl Investment Management Co reports 10.73% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 5, 2026 - Putnam Fl Investment Management Co filed a 13F-HR form disclosing ownership of 454 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $350,779 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 410 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 10.73% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-05 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 454 44 10.73 351 10.76 0.0052
2026-02-09 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 410 -413 -50.18 316 -31.60 0.0046
2025-10-10 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 823 -196 -19.23 463 -13.64 0.0069
2025-08-12 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,019 -482 -32.11 535 -43.74 0.0092
2025-05-15 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,501 -5,992 -79.97 952 -82.18 0.0178
2025-02-05 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 7,493 -12,619 -62.74 5,337 -74.76 0.0975
2024-11-08 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 20,112 -1,693 -7.76 21,143 -7.75 0.3800
2024-08-14 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 21,805 2,303 11.81 22,917 22.09 0.4299
2024-05-03 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 19,502 662 3.51 18,771 13.44 0.3997
2024-01-30 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 18,840 87 0.46 16,547 7.22 0.3900
2023-11-06 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 18,753 303 1.64 15,433 16.41 0.4278
2023-08-14 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 18,450 -99 -0.53 13,257 -13.02 0.3610
2023-04-27 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 18,549 6 0.03 15,241 13.93 0.4969
2023-01-31 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 18,543 -28 -0.15 13,378 4.57 0.4868
2022-11-07 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 18,571 333 1.83 12,793 18.66 0.4975
2022-08-08 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 18,238 153 0.85 10,781 -14.65 0.3957
2022-04-28 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 18,085 -849 -4.48 12,631 5.64 0.4031
2022-02-15 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 18,934 -89 -0.47 11,957 3.87 0.3667
2021-10-26 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 19,023 462 2.49 11,512 11.04 0.3906
2021-08-11 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 18,561 475 2.63 10,367 21.15 0.3575
2021-05-14 2021-03-31 13F Regeneron Pharmaceuticals COM 75886F107 18,086 -958 -5.03 8,557 -7.00 0.3752
2021-02-02 2020-12-31 13F Regeneron Pharmaceuticals COM 75886F107 19,044 1,042 5.79 9,201 -8.69 0.4318
2020-11-03 2020-09-30 13F Regeneron Pharmaceuticals COM 75886F107 18,002 -1,115 -5.83 10,077 -15.48 0.5522
2020-08-13 2020-06-30 13F Regeneron Pharmaceuticals COM 75886F107 19,117 1,021 5.64 11,922 34.93 0.7089
2020-05-08 2020-03-31 13F Regeneron Pharmaceuticals COM 75886F107 18,096 1,489 8.97 8,836 41.72 0.6704
2020-01-30 2019-12-31 13F Regeneron Pharmaceuticals COM 75886F107 16,607 -705 -4.07 6,235 29.84 0.3829
2019-11-05 2019-09-30 13F Regeneron Pharmaceuticals COM 75886F107 17,312 -593 -3.31 4,802 -14.31 0.3380
2019-07-25 2019-06-30 13F Regeneron Pharmaceuticals COM 75886F107 17,905 -1,072 -5.65 5,604 -28.08 0.4508
2019-05-15 2019-03-31 13F Regeneron Pharmaceuticals COM 75886F107 18,977 -688 -3.50 7,792 6.09 0.6543
2019-02-22 2018-12-31 13F Regeneron Pharmaceuticals COM 75886F107 19,665 321 1.66 7,345 -6.03 0.7979
2018-11-13 2018-09-30 13F Regeneron Pharmaceuticals COM 75886F107 19,344 306 1.61 7,816 19.00 0.7158
2018-08-01 2018-06-30 13F Regeneron Pharmaceuticals COM 75886F107 19,038 539 2.91 6,568 3.11 0.6358
2018-05-01 2018-03-31 13F Regeneron Pharmaceuticals COM 75886F107 18,499 -58 -0.31 6,370 -8.70 0.5825
2018-02-06 2017-12-31 13F Regeneron Pharmaceuticals COM 75886F107 18,557 -1,618 -8.02 6,977 -22.65 0.6397
2017-11-07 2017-09-30 13F Regeneron Pharmaceuticals COM 75886F107 20,175 2,979 17.32 9,020 35.35 0.8601
2017-05-12 2017-03-31 13F Regeneron Pharmaceuticals COM 75886F107 17,196 2,487 16.91 6,664 23.41 0.6922
2017-01-26 2016-12-31 13F Regeneron Pharmaceuticals COM 75886F107 14,709 -214 -1.43 5,400 -9.98 0.6204
2016-10-17 2016-09-30 13F Regeneron Pharmaceuticals COM 75886F107 14,923 61 0.41 5,999 15.59 0.6834
2016-08-01 2016-06-30 13F Regeneron Pharmaceuticals COM 75886F107 14,862 14,862 5,190 0.6155
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.