Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionArizona State Retirement System
Latest Disclosed Ownership28,298 shares
Latest Disclosed Value $ 21,864,167
Arizona State Retirement System reports 3.20% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 1, 2026 - Arizona State Retirement System filed a 13F-HR form disclosing ownership of 28,298 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $21,864,167 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 29,232 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -3.20% 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)
2026-05-01 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 28,298 -934 -3.20 21,864 -3.10 0.1279
2026-01-28 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 29,232 -1,766 -5.70 22,563 29.46 0.1227
2025-11-03 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 30,998 -224 -0.72 17,429 6.33 0.0929
2025-08-13 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 31,222 -462 -1.46 16,392 -18.43 0.0944
2025-05-01 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 31,684 460 1.47 20,095 -9.65 0.1279
2025-02-06 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 31,224 185 0.60 22,242 -31.84 0.1359
2024-11-12 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 31,039 -254 -0.81 32,629 -0.79 0.2058
2024-08-05 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 31,293 550 1.79 32,890 11.15 0.2196
2024-05-07 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 30,743 712 2.37 29,590 12.19 0.2047
2024-01-24 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 30,031 -508 -1.66 26,376 4.95 0.2002
2023-11-07 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 30,539 -192 -0.62 25,132 13.82 0.2135
2023-08-01 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 30,731 1,493 5.11 22,081 -8.08 0.1792
2023-04-27 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 29,238 31 0.11 24,024 14.00 0.2156
2023-02-08 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 29,207 -158 -0.54 21,073 4.17 0.2035
2022-11-07 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 29,365 88 0.30 20,229 16.88 0.2092
2022-07-28 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 29,277 268 0.92 17,307 -14.58 0.1680
2022-05-04 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 29,009 222 0.77 20,260 11.44 0.1632
2022-02-04 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 28,787 -403 -1.38 18,180 2.92 0.1385
2021-11-12 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 29,190 -308 -1.04 17,665 7.22 0.1441
2021-08-02 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 29,498 -51 -0.17 16,476 17.85 0.1340
2021-05-06 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 29,549 -614 -2.04 13,981 -4.06 0.1221
2021-01-28 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 30,163 -512 -1.67 14,572 -15.14 0.1322
2020-11-05 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 30,675 6,981 29.46 17,171 16.20 0.1707
2020-08-04 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 23,694 9,137 62.77 14,777 107.89 0.2084
2020-05-05 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 14,557 -443 -2.95 7,108 26.21 0.1222
2020-01-27 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 15,000 79 0.53 5,632 36.07 0.0678
2019-10-31 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 14,921 -36 -0.24 4,139 -11.60 0.0505
2019-07-25 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 14,957 -93 -0.62 4,682 -24.24 0.0542
2019-04-29 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 15,050 -897 -5.62 6,180 3.76 0.0735
2019-01-28 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 15,947 -3,258 -16.96 5,956 -23.25 0.0766
2018-10-29 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 19,205 195 1.03 7,760 18.33 0.0732
2018-08-07 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 19,010 -108 -0.56 6,558 -0.38 0.0660
2018-05-14 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 19,118 -400 -2.05 6,583 -10.29 0.0664
2018-02-09 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 19,518 518 2.73 7,338 -13.62 0.0715
2017-11-14 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 19,000 100 0.53 8,495 -8.49 0.1015
2017-08-02 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 18,900 100 0.53 9,283 27.43 0.1286
2017-05-10 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 18,800 100 0.53 7,285 6.12 0.1023
2017-02-10 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 18,700 100 0.54 6,865 -8.20 0.1010
2016-11-01 2016-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 18,600 -500 -2.62 7,478 12.11 0.1135
2016-08-15 2016-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 19,100 -2,100 -9.91 6,670 -12.71 0.0936
2016-05-16 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 21,200 300 1.44 7,641 -32.65 0.0994
2016-02-12 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 20,900 -300 -1.42 11,346 15.06 0.1510
2015-11-20 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 21,200 400 1.92 9,861 15.56 0.1383
2015-02-11 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 20,800 300 1.46 8,533 15.47 0.1005
2014-11-21 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 20,500 -2,300 -10.09 7,390 14.75 0.0917
2014-08-07 2014-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 22,800 900 4.11 6,440 -2.07 0.0779
2014-05-19 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 21,900 -600 -2.67 6,576 6.20 0.0833
2014-02-05 2013-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 22,500 -400 -1.75 6,192 -13.57 0.0762
2013-11-01 2013-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 22,900 700 3.15 7,164 43.51 0.0918
2013-09-17 2013-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 22,200 -35,500 -61.53 4,992 -50.95 0.0681
2013-09-17 2013-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 57,700 57,700 10,178 0.1458
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.