Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionComerica Bank
Latest Disclosed Ownership17,340 shares
Latest Disclosed Value $ 13,384,527
Comerica Bank reports 1.98% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On January 29, 2026 - Comerica Bank filed a 13F-HR form disclosing ownership of 17,340 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $13,384,527 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 14, 2025 disclosing 17,690 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -1.98% 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)
2026-01-29 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 17,340 -350 -1.98 13,385 34.57 0.0534
2025-11-14 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 17,690 2,783 18.67 9,946 27.09 0.0374
2025-08-14 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 14,907 -69 -0.46 7,826 -17.60 0.0304
2025-05-14 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 14,976 789 5.56 9,498 -6.01 0.0399
2025-02-14 2024-12-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 14,187 -1,364 -8.77 10,106 -38.19 0.0408
2025-02-14 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 14,187 -1,364 10,106 0.0338
2024-11-14 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 15,551 191 1.24 16,348 1.27 0.0647
2024-08-15 2024-06-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 15,360 54 0.35 16,143 9.58 0.0672
2024-05-16 2024-03-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 15,306 -363 -2.32 14,732 7.06 0.0635
2024-02-14 2023-12-31 13F REGENERON PHARMACEUTICALS COMMON 75886F107 15,669 -637 -3.91 13,762 2.55 0.0634
2023-11-21 2023-09-30 13F REGENERON PHARMACEUTICALS COMMON 75886F107 16,306 -5,863 -26.45 13,419 0.0699
2023-08-22 2023-06-30 13F REGENERON PHARMACEUTICALS EQU 75886F107 22,169 8,451 61.61 0 -100.00 0.0001
2023-01-26 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 13,718 -427 -3.02 10 -99.91 0.0776
2022-10-28 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 14,145 -235 -1.63 10,427 21.73 0.0879
2022-08-02 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 14,380 167 1.17 8,566 -16.25 0.0703
2022-04-27 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 14,213 -312 -2.15 10,228 16.73 0.0742
2022-02-18 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 14,525 -212 -1.44 8,762 3.88 0.0645
2021-11-22 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 14,737 -4,276 -22.49 8,435 -32.34 0.0508
2021-08-26 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 19,013 -1,178 -5.83 12,466 26.37 0.0744
2021-04-28 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 20,191 -378 -1.84 9,865 -10.82 0.0588
2021-01-28 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 20,569 975 4.98 11,062 -2.63 0.0702
2020-10-30 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 19,594 913 4.89 11,361 -4.60 0.0825
2020-07-31 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 18,681 3,483 22.92 11,909 38.38 0.0918
2020-05-01 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 15,198 -387 -2.48 8,606 64.27 0.0789
2020-02-07 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 15,585 -295 -1.86 5,239 7.91 0.0397
2019-10-31 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 15,880 736 4.86 4,855 7.06 0.0384
2019-08-02 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 15,144 -117 -0.77 4,535 -27.21 0.0363
2019-05-02 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 15,261 -14,685 -49.04 6,230 -50.12 0.0505
2019-02-06 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 29,946 -5,379 -15.23 12,491 -7.12 0.1061
2018-11-01 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 35,325 -4,391 -11.06 13,448 -7.34 0.1085
2018-08-01 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 39,716 24 0.06 14,513 15.77 0.1015
2018-05-01 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 39,692 2,819 7.65 12,536 -11.31 0.0896
2018-02-02 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 36,873 5,518 17.60 14,134 10.89 0.0942
2017-11-06 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 31,355 810 2.65 12,746 -19.94 0.0922
2017-08-03 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 30,545 -159 -0.52 15,921 41.43 0.1192
2017-05-03 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 30,704 714 2.38 11,257 1.96 0.0854
2017-02-08 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 29,990 7,792 35.10 11,041 18.63 0.0873
2016-08-11 2016-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 22,198 -981 -4.23 9,307 -1.27 0.0804
2016-05-11 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 23,179 -1,098 -4.52 9,427 -21.02 0.0842
2016-02-05 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 24,277 869 3.71 11,936 9.63 0.1171
2015-11-12 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 23,408 -23,208 -49.79 10,888 -54.21 0.1031
2015-08-13 2015-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 46,616 23,063 97.92 23,778 123.60 0.1021
2015-05-15 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 23,553 -15,957 -40.39 10,634 -34.39 0.0901
2015-02-13 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 39,510 19,591 98.35 16,208 125.71 0.0701
2014-10-21 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 19,919 -2,793 -12.30 7,181 11.94 0.0634
2014-08-12 2014-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 22,712 -7,749 -25.44 6,415 -29.87 0.0545
2014-05-15 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 30,461 247 0.82 9,147 9.99 0.0701
2014-02-11 2013-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 30,214 -754 -2.43 8,316 -14.17 0.0645
2013-11-12 2013-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 30,968 893 2.97 9,689 43.26 0.0674
2013-08-13 2013-06-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 30,075 30,075 6,763 0.0551
2013-08-08 2013-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 149,375 33,591
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.