Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionChevy Chase Trust Holdings, Inc.
Latest Disclosed Ownership205,833 shares
Latest Disclosed Value $ 159,034,933
Chevy Chase Trust Holdings, Inc. reports 2.53% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 15, 2026 - Chevy Chase Trust Holdings, Inc. filed a 13F-HR form disclosing ownership of 205,833 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $159,034,933 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 200,747 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 2.53% 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)
2026-05-15 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 205,833 5,086 2.53 159,035 2.64 0.3324
2026-02-13 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 200,747 -2,405 -1.18 154,951 35.65 0.4186
2025-11-14 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 203,152 -3,576 -1.73 114,226 5.25 0.3142
2025-07-29 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 206,728 -14,482 -6.55 108,532 -22.64 0.3157
2025-04-23 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 221,210 -8,557 -3.72 140,298 -14.28 0.4486
2025-01-30 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 229,767 -8,612 -3.61 163,670 -34.69 0.4983
2024-11-14 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 238,379 -3,375 -1.40 250,594 -1.38 0.7681
2024-07-22 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 241,754 -626 -0.26 254,091 8.92 0.8106
2024-05-03 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 242,380 -7,197 -2.88 233,288 6.43 0.7635
2024-01-24 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 249,577 -1,344 -0.54 219,201 6.15 0.7845
2023-10-23 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 250,921 -1,811 -0.72 206,498 13.71 0.8157
2023-07-25 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 252,732 -1,736 -0.68 181,598 -13.15 0.6802
2023-05-17 2023-03-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 254,468 -3,666 -1.42 209,089 12.27 0.8275
2023-05-16 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,922 -256,212 1,579 0.2157
2023-02-09 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 258,134 -22,210 -7.92 186,241 -3.56 0.7916
2022-11-04 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 280,344 14,881 5.61 193,122 23.07 0.8246
2022-08-10 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 265,463 15,428 6.17 156,924 -10.14 0.6489
2022-04-27 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 250,035 18,161 7.83 174,628 19.26 0.6017
2022-01-31 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 231,874 10,618 4.80 146,432 9.36 0.4720
2021-10-20 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 221,256 40,261 22.24 133,899 32.45 0.4666
2021-07-20 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 180,995 11,658 6.88 101,094 26.18 0.3439
2021-04-22 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 169,337 32,207 23.49 80,118 20.93 0.2856
2021-02-12 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 137,130 -4,915 -3.46 66,250 -16.68 0.2361
2020-11-06 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 142,045 8,664 6.50 79,517 -4.41 0.3143
2020-08-14 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 133,381 47,978 56.18 83,183 99.48 0.3373
2020-05-13 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 85,403 1,110 1.32 41,700 31.75 0.1941
2020-02-12 2019-12-31 13F Regeneron Pharms COM 75886F107 84,293 -3,142 -3.59 31,652 30.50 0.1198
2019-11-20 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 87,435 -37,187 -29.84 24,254 -37.82 0.0995
2019-08-14 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 124,622 -24,106 -16.21 39,007 -24.35 0.1616
2019-05-13 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 148,728 29,030 24.25 51,564 15.34 0.2133
2019-02-14 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 119,698 13,242 12.44 44,708 3.94 0.2181
2018-10-23 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 106,456 4,600 4.52 43,012 22.41 0.1783
2018-08-02 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 101,856 2,571 2.59 35,139 2.78 0.1523
2018-04-10 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 99,285 -3,338 -3.25 34,189 -11.39 0.1519
2018-01-22 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 102,623 -26,896 -20.77 38,583 -33.38 0.1662
2017-11-14 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 129,519 33,800 35.31 57,913 23.19 0.2624
2017-07-13 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 95,719 23,553 32.64 47,012 68.10 0.2250
2017-04-05 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 72,166 2,728 3.93 27,966 9.71 0.1373
2017-01-09 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 69,438 213 0.31 25,490 -8.41 0.1351
2016-10-05 2016-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 69,225 -3,626 -4.98 27,830 9.39 0.1523
2016-07-08 2016-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 72,851 833 1.16 25,441 -1.99 0.1418
2016-04-07 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 72,018 7,798 12.14 25,958 -25.54 0.1484
2016-01-15 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 64,220 681 1.07 34,863 17.96 0.2045
2015-10-15 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 63,539 3,724 6.23 29,554 -3.14 0.1845
2015-07-15 2015-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 59,815 2,029 3.51 30,513 16.96 0.1827
2015-04-17 2015-03-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 57,786 1,519 2.70 26,089 13.02 0.1574
2015-04-15 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 57,786 26,089
2015-01-15 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 56,267 -136 -0.24 23,083 13.51 0.1443
2014-10-17 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 56,403 -771 -1.35 20,335 25.91 0.1316
2014-07-16 2014-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 57,174 -456 -0.79 16,150 -6.67 0.1123
2014-04-15 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 57,630 193 0.34 17,305 9.46 0.1241
2014-01-23 2013-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 57,437 1,118 1.99 15,809 -10.28 0.1155
2013-10-15 2013-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 56,319 2,459 4.57 17,620 45.48 0.1438
2013-07-18 2013-06-30 13F/A-2 REGENERON PHARMACEUTICALS COM 75886F107 53,860 53,860 12,112 0.1060
2013-07-18 2013-06-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 1,421 -52,439 320 0.0691
2013-07-17 2013-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,421 320
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.