Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionNorthwestern Mutual Wealth Management Co
Latest Disclosed Ownership4,053 shares
Latest Disclosed Value $ 3,131,472
Northwestern Mutual Wealth Management Co reports 3.29% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 7, 2026 - Northwestern Mutual Wealth Management Co filed a 13F-HR form disclosing ownership of 4,053 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $3,131,472 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 10, 2026 disclosing 4,191 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -3.29% 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)
2026-05-07 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,053 -138 -3.29 3,131 -3.21 0.0019
2026-02-10 2025-12-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 4,191 1,015 31.96 3,235 81.23 0.0020
2026-02-05 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 132,404 129,228 56,724 0.0358
2025-11-14 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,176 -658 -17.16 1,786 -11.28 0.0012
2025-08-13 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,834 -299 -7.23 2,013 -23.24 0.0015
2025-05-14 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,133 297 7.74 2,622 -4.06 0.0021
2025-02-11 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,836 -133 -3.35 2,733 -34.52 0.0023
2024-11-12 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,969 148 3.87 4,172 3.91 0.0037
2024-08-16 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,821 536 16.32 4,016 27.02 0.0040
2024-05-15 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,285 -470 -12.52 3,162 -4.12 0.0032
2024-02-13 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,755 86 2.34 3,298 9.21 0.0037
2023-11-14 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,669 49 1.35 3,019 16.07 0.0039
2023-08-14 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,620 -6 -0.17 2,601 -12.69 0.0034
2023-05-15 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,626 -241 -6.23 2,979 6.81 0.0042
2023-02-21 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,867 188 5.11 2,790 10.02 0.0042
2022-11-14 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,679 -201 -5.18 2,535 10.51 0.0044
2022-08-04 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,880 698 21.94 2,294 3.19 0.0039
2022-05-09 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,182 -483 -13.18 2,223 -3.97 0.0036
2022-02-03 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,665 -167 -4.36 2,315 -0.13 0.0038
2021-11-15 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,832 669 21.15 2,318 31.18 0.0042
2021-08-13 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,163 283 9.83 1,767 29.64 0.0034
2021-05-14 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,880 360 14.29 1,363 11.81 0.0029
2021-02-12 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,520 -19 -0.75 1,219 -14.28 0.0028
2020-11-13 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,539 182 7.72 1,422 -3.27 0.0038
2020-08-14 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,357 205 9.53 1,470 39.87 0.0045
2020-05-08 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,152 -682 -24.06 1,051 -1.22 0.0041
2020-02-13 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,834 255 9.89 1,064 48.81 0.0036
2019-11-12 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,579 778 43.20 715 26.77 0.0027
2019-08-12 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,801 132 7.91 564 -17.66 0.0023
2019-05-10 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,669 18 1.09 685 11.02 0.0030
2019-02-12 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,651 202 13.94 617 5.29 0.0031
2018-11-01 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,449 -126 -8.00 586 7.92 0.0030
2018-08-10 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,575 -34 -2.11 543 -1.99 0.0030
2018-05-14 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,609 -182 -10.16 554 -17.68 0.0034
2018-01-31 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,791 40 2.28 673 -14.05 0.0043
2017-11-07 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,751 69 4.10 783 -5.09 0.0056
2017-08-10 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,682 -74 -4.21 825 21.32 0.0066
2017-05-09 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,756 328 22.97 680 29.52 0.0062
2017-02-15 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,428 208 17.05 525 7.14 0.0057
2016-11-14 2016-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,220 150 14.02 490 31.37 0.0075
2016-08-29 2016-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,070 304 39.69 373 35.14 0.0053
2016-05-16 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 766 339 79.39 276 18.97 0.0045
2016-02-16 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 427 -5 -1.16 232 15.42 0.0046
2015-11-16 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 432 -1,406 -76.50 201 -78.57 0.0048
2015-09-30 2015-06-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 1,838 -1,528 -45.40 938 -38.29 0.0243
2015-08-14 2015-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,338 1,514
2015-05-15 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,366 -197 -5.53 1,520 4.04 0.0425
2015-02-13 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,563 -51 -1.41 1,461 12.21 0.0451
2014-11-14 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,614 -8 -0.22 1,302 27.27 0.0455
2014-08-05 2014-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,622 356 10.90 1,023 4.28 0.0399
2014-05-15 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,266 151 4.85 981 14.47 0.0410
2014-02-14 2013-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,115 3,105 31,050.00 857 28,466.67 0.0389
2013-11-14 2013-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 10 -58,250 -99.98 3 -99.98 0.0002
2013-08-14 2013-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 58,260 58,260 13,102 0.1441
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.