Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionToronto Dominion Bank
Latest Disclosed Ownership38,427 shares
Latest Disclosed Value $ 29,690,178
Toronto Dominion Bank reports 28.78% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 15, 2026 - Toronto Dominion Bank filed a 13F-HR form disclosing ownership of 38,427 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $29,690,178 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 53,958 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -28.78% 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)
2026-05-15 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 38,427 -15,531 -28.78 29,690 -28.71 0.0153
2026-02-17 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 53,958 -938 -1.71 41,648 34.93 0.0615
2025-11-14 2025-09-30 13F Regeneron Pharmaceuticals COM 75886F107 54,896 -16,062 -22.64 30,866 -17.14 0.0479
2025-08-14 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 70,958 21,790 44.32 37,253 19.46 0.0618
2025-05-15 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 49,168 -10,837 -18.06 31,184 -27.05 0.0611
2025-02-19 2024-12-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 60,005 5,286 9.66 42,743 -25.69 0.0675
2025-02-14 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 60,005 5,286 42,743 0.0207
2024-11-18 2024-09-30 13F/A-1 Regeneron Pharmaceuticals COM 75886F107 54,719 1,378 2.58 57,523 2.60 0.1017
2024-11-14 2024-09-30 13F Regeneron Pharmaceuticals COM 75886F107 54,719 1,378 57,523 0.0040
2024-08-14 2024-06-30 13F Regeneron Pharmaceuticals COM 75886F107 53,341 -8,879 -14.27 56,063 -6.39 0.0899
2024-05-14 2024-03-31 13F Regeneron Pharmaceuticals COM 75886F107 62,220 612 0.99 59,886 10.68 0.0939
2024-02-13 2023-12-31 13F Regeneron Pharmaceuticals COM 75886F107 61,608 1,892 3.17 54,110 10.11 0.0785
2024-02-14 2023-09-30 13F/A-1 Regeneron Pharmaceuticals COM 75886F107 59,716 -2,081 -3.37 49,144 111,588.64 0.0813
2023-11-14 2023-09-30 13F Regeneron Pharmaceuticals COM 75886F107 59,716 -2,081 49,144 0.0032
2024-02-14 2023-06-30 13F/A-1 Regeneron Pharmaceuticals COM 75886F107 61,797 2,190 3.67 44 -8.33 0.0658
2023-08-10 2023-06-30 13F Regeneron Pharmaceuticals COM 75886F107 61,797 2,190 44 0.0660
2023-05-11 2023-03-31 13F Regeneron Pharmaceuticals COM 75886F107 59,607 4,078 7.34 49 20.00 0.0798
2023-02-07 2022-12-31 13F Regeneron Pharmaceuticals COM 75886F107 55,529 8,217 17.37 40 -99.88 0.0599
2022-11-09 2022-09-30 13F Regeneron Pharmaceuticals COM 75886F107 47,312 -8,254 -14.85 32,580 -0.79 0.0580
2022-08-11 2022-06-30 13F Regeneron Pharmaceuticals COM 75886F107 55,566 -7,889 -12.43 32,840 -25.90 0.0612
2022-05-09 2022-03-31 13F Regeneron Pharmaceuticals COM 75886F107 63,455 -8,688 -12.04 44,316 -2.73 0.0669
2022-02-04 2021-12-31 13F Regeneron Pharmaceuticals COM 75886F107 72,143 14,694 25.58 45,559 31.04 0.0609
2021-11-08 2021-09-30 13F Regeneron Pharmaceuticals COM 75886F107 57,449 11,198 24.21 34,766 34.59 0.0544
2021-08-13 2021-06-30 13F/A-1 Regeneron Pharmaceuticals COM 75886F107 46,251 -5,316 -10.31 25,832 5.88 0.0400
2021-08-10 2021-06-30 13F Regeneron Pharmaceuticals COM 75886F107 46,251 -5,316 25,832 0.0085
2021-05-11 2021-03-31 13F Regeneron Pharmaceuticals COM 75886F107 51,567 -10,075 -16.34 24,398 -18.07 0.0429
2021-02-08 2020-12-31 13F Regeneron Pharmaceuticals COM 75886F107 61,642 3,072 5.25 29,779 -9.17 0.0547
2020-10-30 2020-09-30 13F Regeneron Pharmaceuticals COM 75886F107 58,570 -7,879 -11.86 32,786 -20.89 0.0806
2020-08-28 2020-06-30 13F/A-1 Regeneron Pharmaceuticals COM 75886F107 66,449 5,748 9.47 41,441 39.82 0.1051
2020-08-10 2020-06-30 13F Regeneron Pharmaceuticals COM 75886F107 66 -60,635 41,441 24,063.1287
2020-05-13 2020-03-31 13F Regeneron Pharmaceuticals COM 75886F107 60,701 -47,801 -44.06 29,639 -27.24 0.0905
2020-02-13 2019-12-31 13F Regeneron Pharmaceuticals COM 75886F107 108,502 30,489 39.08 40,737 88.25 0.0684
2019-11-12 2019-09-30 13F Regeneron Pharmaceuticals COM 75886F107 78,013 19,797 34.01 21,640 18.79 0.0456
2019-08-26 2019-06-30 13F/A-1 Regeneron Pharmaceuticals COM 75886F107 58,216 -6,343 -9.83 18,217 -31.26 0.0388
2019-08-13 2019-06-30 13F Regeneron Pharmaceuticals COM 75886F107 58,216 -6,343 18,217
2019-05-06 2019-03-31 13F Regeneron Pharmaceuticals COM 75886F107 64,559 17,699 37.77 26,503 51.45 0.0414
2019-02-07 2018-12-31 13F Regeneron Pharmaceuticals COM 75886F107 46,860 -3,945 -7.76 17,499 -14.73 0.0300
2018-11-07 2018-09-30 13F Regeneron Pharmaceuticals COM 75886F107 50,805 889 1.78 20,523 19.20 0.0375
2018-08-06 2018-06-30 13F Regeneron Pharmaceuticals COM 75886F107 49,916 8,157 19.53 17,217 19.75 0.0349
2018-05-10 2018-03-31 13F Regeneron Pharmaceuticals COM 75886F107 41,759 8,500 25.56 14,377 14.98 0.0320
2018-02-08 2017-12-31 13F Regeneron Pharmaceuticals COM 75886F107 33,259 4,057 13.89 12,504 -4.22 0.0370
2017-11-06 2017-09-30 13F Regeneron Pharmaceuticals COM 75886F107 29,202 3,367 13.03 13,055 2.91 0.0420
2017-08-18 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 25,835 5,295 25.78 12,686 59.41 0.0406
2017-05-05 2017-03-31 13F Regeneron Pharmaceuticals COM 75886F107 20,540 7,487 57.36 7,958 66.10 0.0213
2017-02-06 2016-12-31 13F Regeneron Pharmaceuticals COM 75886F107 13,053 10,832 487.71 4,791 436.51 0.0142
2016-11-03 2016-09-30 13F Regeneron Pharmaceuticals COM 75886F107 2,221 1,797 423.82 893 503.38 0.0030
2016-08-15 2016-06-30 13F Regeneron Pharmaceuticals COM 75886F107 424 -152 -26.39 148 -28.85 0.0006
2016-05-04 2016-03-31 13F Regeneron Pharmaceuticals COM 75886F107 576 -1,804 -75.80 208 -83.90 0.0013
2016-02-09 2015-12-31 13F Regeneron Pharmaceuticals COM 75886F107 2,380 -82 -3.33 1,292 12.84 0.0079
2015-11-10 2015-09-30 13F Regeneron Pharmaceuticals COM 75886F107 2,462 382 18.37 1,145 7.92 0.0065
2015-08-11 2015-06-30 13F Regeneron Pharmaceuticals COM 75886F107 2,080 51 2.51 1,061 15.83 0.0050
2015-05-15 2015-03-31 13F Regeneron Pharmaceuticals COM 75886F107 2,029 -1,033 -33.74 916 -27.07 0.0039
2015-02-10 2014-12-31 13F Regeneron Pharmaceuticals COM 75886F107 3,062 1,669 119.81 1,256 150.20 0.0050
2014-11-07 2014-09-30 13F Regeneron Pharmaceuticals COM 75886F107 1,393 -110 -7.32 502 18.12 0.0018
2014-08-11 2014-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,503 246 19.57 425 12.73 0.0014
2014-05-09 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,257 3 0.24 377 9.28 0.0013
2014-02-11 2013-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,254 1,254 345 0.0012
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.