Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionKentucky Retirement Systems
Latest Disclosed Ownership6,484 shares
Latest Disclosed Value $ 1,785
Kentucky Retirement Systems reports 0.98% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 19, 2026 - Kentucky Retirement Systems filed a 13F-HR form disclosing ownership of 6,484 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $1,785 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 6,548 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -0.98% 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)
2026-05-19 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,484 -64 -0.98 2 -99.98 0.1307
2026-02-10 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,548 0 0.00 5,054 37.30 0.1369
2025-11-13 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,548 -150 -2.24 3,682 4.69 0.1018
2025-08-20 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,698 -439 -6.15 3,516 -22.32 0.1029
2025-04-22 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 7,137 -155 -2.13 4,526 -12.86 0.1380
2025-02-03 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 7,292 -101 -1.37 5,194 -33.16 0.1531
2024-11-06 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 7,393 -600 -7.51 7,772 -7.49 0.2291
2024-08-12 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 7,993 -30 -0.37 8,401 8.78 0.2434
2024-05-15 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,023 -548 -6.39 7,722 2.59 0.2307
2024-02-08 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,571 85 1.00 7,528 7.79 0.2350
2023-10-12 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,486 -189 -2.18 6,984 116,283.33 0.2427
2023-08-07 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,675 175 2.06 6 0.00 0.2086
2023-05-10 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,500 73 0.87 7 0.00 0.2572
2023-02-06 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,427 36 0.43 6 -99.90 0.2398
2022-11-16 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,391 373 4.65 5,780 21.94 0.2452
2022-08-08 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,018 1,216 17.88 4,740 -0.23 0.2002
2022-05-09 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,802 -94 -1.36 4,751 9.09 0.1947
2022-02-04 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,896 788 12.90 4,355 17.83 0.1770
2021-11-17 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,108 11 0.18 3,696 8.55 0.1739
2021-08-12 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,097 -148 -2.37 3,405 15.23 0.1610
2021-05-14 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,245 -75 -1.19 2,955 -3.21 0.1445
2021-02-11 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,320 236 3.88 3,053 -10.36 0.1575
2020-11-12 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,084 469 8.35 3,406 -2.74 0.2102
2020-08-12 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,615 159 2.91 3,502 31.46 0.2457
2020-05-01 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 5,456 1,346 32.75 2,664 72.65 0.1821
2020-02-18 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,110 15 0.37 1,543 35.83 0.1123
2019-11-05 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,095 433 11.82 1,136 -0.87 0.0902
2019-08-07 2019-06-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 3,662 235 6.86 1,146 -18.55 0.1010
2019-08-07 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,662 235 1,146
2019-05-22 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,427 51 1.51 1,407 11.58 0.1362
2019-02-25 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,376 76 2.30 1,261 -5.40 0.1382
2018-11-19 2018-09-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 3,300 16 0.49 1,333 17.65 0.1274
2018-11-16 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,484 3,200 1,785
2018-08-13 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,284 -746 -18.51 1,133 -18.37 0.1159
2018-05-07 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,030 -721 -15.18 1,388 -22.28 0.1183
2018-02-13 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,751 72 1.54 1,786 -14.63 0.1272
2017-11-08 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,679 -206 -4.22 2,092 -12.80 0.1580
2017-08-18 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 4,885 10 0.21 2,399 27.00 0.1803
2017-05-24 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,875 -611 -11.14 1,889 -6.21 0.1455
2017-02-24 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 5,486 -2,415 -30.57 2,014 -36.59 0.1441
2016-11-30 2016-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 7,901 1,268 19.12 3,176 37.13 0.2114
2016-09-12 2016-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,633 -540 -7.53 2,316 -10.41 0.1498
2016-06-09 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 7,173 1,276 21.64 2,585 -19.24 0.1569
2016-02-22 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 5,897 592 11.16 3,201 29.70 0.2357
2015-11-18 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,305 218 4.29 2,468 -4.89 0.2126
2015-08-26 2015-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,087 121 2.44 2,595 15.74 0.2111
2015-05-29 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 4,966 -551 -9.99 2,242 -0.93 0.1820
2015-03-04 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 5,517 -223 -3.89 2,263 9.38 0.1669
2014-12-12 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,740 -788 -12.07 2,069 5.56 0.1518
2014-05-22 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,528 44 0.68 1,960 9.80 0.1416
2014-02-13 2013-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,484 4 0.06 1,785 -11.94 0.1307
2013-11-15 2013-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 6,480 6,480 2,027 0.1633
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.