Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionKorea Investment CORP
Latest Disclosed Ownership73,063 shares
Latest Disclosed Value $ 56,451,396
Korea Investment CORP reports 5.53% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 13, 2026 - Korea Investment CORP filed a 13F-HR form disclosing ownership of 73,063 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $56,451,396 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 69,234 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 5.53% 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)
2026-05-13 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 73,063 3,829 5.53 56,451 5.64 0.1169
2026-02-13 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 69,234 7,777 12.65 53,440 54.65 0.1052
2025-11-13 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 61,457 5,181 9.21 34,555 16.96 0.0711
2025-08-13 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 56,276 -9,664 -14.66 29,545 -29.36 0.0657
2025-05-14 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 65,940 -12,283 -15.70 41,821 -24.94 0.1014
2025-02-12 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 78,223 -277 -0.35 55,721 -32.48 0.1321
2024-11-13 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 78,500 -1,318 -1.65 82,522 -1.63 0.1958
2024-08-13 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 79,818 -7,024 -8.09 83,891 0.37 0.2114
2024-05-14 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 86,842 -13,759 -13.68 83,585 -5.40 0.2121
2024-02-13 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 100,601 4,805 5.02 88,357 12.08 0.2320
2023-11-13 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 95,796 -14,550 -13.19 78,836 -0.57 0.2322
2023-08-11 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 110,346 2,687 2.50 79,288 -10.37 0.2228
2023-05-12 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 107,659 -5,146 -4.56 88,460 8.69 0.2576
2023-02-13 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 112,805 -6,348 -5.33 81,388 -0.85 0.2557
2022-11-10 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 119,153 10,443 9.61 82,081 27.73 0.2527
2022-08-12 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 108,710 6,369 6.22 64,262 -10.09 0.1964
2022-05-13 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 102,341 46,828 84.36 71,477 103.88 0.1768
2022-02-09 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 55,513 -30,549 -35.50 35,058 -32.69 0.0911
2021-11-12 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 86,062 24,016 38.71 52,083 50.29 0.1553
2021-08-12 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 62,046 -1,120 -1.77 34,655 15.96 0.0993
2021-05-13 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 63,166 -4,634 -6.83 29,886 -8.76 0.0943
2021-02-10 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 67,800 27,400 67.82 32,755 44.84 0.0984
2020-11-12 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 40,400 8,200 25.47 22,615 12.61 0.0799
2020-08-12 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 32,200 -29,500 -47.81 20,082 -33.34 0.0738
2020-05-14 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 61,700 4,800 8.44 30,127 41.01 0.1322
2020-02-11 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 56,900 15,400 37.11 21,365 85.59 0.0779
2019-11-12 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 41,500 5,700 15.92 11,512 2.74 0.0487
2019-08-12 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 35,800 -5,700 -13.73 11,205 -34.25 0.0482
2019-05-15 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 41,500 6,288 17.86 17,041 29.57 0.0767
2019-02-13 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 35,212 11,479 48.37 13,152 37.16 0.0715
2018-11-13 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 23,733 -19,109 -44.60 9,589 -35.12 0.0442
2018-08-13 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 42,842 -1,860 -4.16 14,780 -3.99 0.0673
2018-05-09 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 44,702 13,221 42.00 15,394 30.06 0.0716
2018-02-12 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 31,481 11,900 60.77 11,836 35.19 0.0539
2017-10-25 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 19,581 -3,410 -14.83 8,755 -22.47 0.0404
2017-07-31 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 22,991 22,693 7,615.10 11,292 9,719.13 0.0526
2017-04-25 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 298 206 223.91 115 238.24 0.0006
2017-02-13 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 92 -8,279 -98.90 34 -98.99 0.0002
2016-11-09 2016-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,371 8,371 0.00 3,365 0.0179
2016-05-12 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -21,900 -100.00 0 -100.00
2016-02-01 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 21,900 2,300 11.73 11,888 30.41 0.0828
2015-11-12 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 19,600 -7,900 -28.73 9,116 -35.02 0.0726
2015-08-13 2015-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 27,500 -800 -2.83 14,029 9.80 0.1196
2015-05-11 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 28,300 18,600 191.75 12,777 221.11 0.0995
2015-02-12 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 9,700 900 10.23 3,979 25.40 0.0327
2014-11-14 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 8,800 -26,200 -74.86 3,173 -67.90 0.0259
2014-08-14 2014-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 35,000 23,400 201.72 9,886 183.84 0.0823
2014-05-14 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,600 900 8.41 3,483 18.27 0.0308
2014-02-06 2013-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 10,700 1,500 16.30 2,945 2.33 0.0278
2013-11-07 2013-09-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 9,200 8,100 736.36 2,878 1,065.18 0.0306
2013-11-05 2013-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 5,900 1,846
2013-08-08 2013-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,100 1,100 247 0.0030
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.