Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionCIBC World Markets Inc.
Latest Disclosed Ownership3,766 shares
Latest Disclosed Value $ 2,909,762
CIBC World Markets Inc. reports 61.81% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 14, 2026 - CIBC World Markets Inc. filed a 13F-HR form disclosing ownership of 3,766 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $2,909,762 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 9,862 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -61.81% 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 3,766 -6,096 -61.81 2,910 -61.78 0.0047
2026-02-10 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 9,862 -5,871 -37.32 7,612 -13.95 0.0123
2025-11-06 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 15,733 10,999 232.34 8,846 255.98 0.0159
2025-08-14 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,734 2,164 84.20 2,485 52.55 0.0049
2025-05-14 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,570 1,439 127.23 1,630 0.0035
2025-01-23 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,131 -193 -14.58 1 -100.00 0.0017
2024-11-12 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,324 -44 -3.22 1 0.00 0.0029
2024-08-07 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,368 211 18.24 1 0.00 0.0033
2024-05-13 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,157 -8 -0.69 1 0.00 0.0026
2024-02-13 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,165 20 1.75 1 0.0026
2023-11-13 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,145 181 18.78 1 0.0031
2023-08-11 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 964 -1,163 -54.68 1 -100.00 0.0022
2023-05-12 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,127 -309 -12.68 2 0.00 0.0059
2023-02-13 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,436 277 12.83 2 -99.93 0.0062
2022-11-10 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,159 -2,922 -57.51 1,487 -50.50 0.0057
2022-08-10 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,081 -1,335 -20.81 3,004 -32.96 0.0106
2022-05-12 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,416 86 1.36 4,481 12.08 0.0142
2022-02-14 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,330 -1,703 -21.20 3,998 -17.75 0.0115
2021-11-12 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,033 3,563 79.71 4,861 94.67 0.0159
2021-08-12 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,470 1,082 31.94 2,497 55.77 0.0070
2021-05-11 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,388 -441 -11.52 1,603 -13.35 0.0047
2021-02-08 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,829 705 22.57 1,850 5.77 0.0059
2020-11-12 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,124 -9,430 -75.12 1,749 -77.66 0.0076
2020-08-13 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 12,554 9,584 322.69 7,829 439.93 0.0354
2020-05-15 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,970 -6,893 -69.89 1,450 -60.84 0.0074
2020-02-13 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 9,863 6,519 194.95 3,703 299.03 0.0151
2019-11-13 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,344 1,118 50.22 928 33.14 0.0042
2019-08-08 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,226 2,226 697 0.0031
2019-05-09 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -648 -100.00 0 -100.00
2019-02-13 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 648 -8,320 -92.77 242 -93.32 0.0012
2018-11-09 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,968 5,802 183.26 3,623 231.78 0.0155
2018-08-08 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,166 1,085 52.14 1,092 52.30 0.0048
2018-05-18 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,081 485 30.39 717 19.50 0.0030
2018-02-01 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,596 828 107.81 600 74.93 0.0027
2017-11-13 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 768 -2,171 -73.87 343 -76.23 0.0016
2017-08-10 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,939 -18,845 -86.51 1,443 -82.91 0.0061
2017-05-08 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 21,784 20,833 2,190.64 8,442 2,318.91 0.0272
2017-05-08 2016-12-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 951 -879 -48.03 349 -52.58 0.0013
2017-01-09 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 951 -879 349 0.0014
2017-05-08 2016-09-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 1,830 1,251 216.06 736 264.36 0.0030
2016-11-03 2016-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,830 1,251 736 0.0032
2016-07-21 2016-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 579 579 0.00 202 0.0009
2016-05-04 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -3,259 -100.00 0 -100.00
2016-01-14 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,259 3,259 0.00 1,769 0.0090
2015-10-22 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -12,847 -100.00 0 -100.00
2015-07-22 2015-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 12,847 10,495 446.22 6,554 517.14 0.0284
2015-04-23 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,352 2,352 1,062 0.0043
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.