Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership426,914 shares
Latest Disclosed Value $ 329,522,109
Alliancebernstein L.p. reports 10.76% decrease in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 426,914 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $329,522,109 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 478,389 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of -10.76% 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.

Upgrade to unlock premium data and export to Excel .

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 426,914 -51,475 -10.76 329,522 -10.76 0.0892
2026-02-17 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 478,389 -45,494 -8.68 369,254 25.36 0.1166
2025-11-14 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 523,883 -63,344 -10.79 294,564 -4.45 0.0928
2025-08-14 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 587,227 -22,381 -3.67 308,294 -20.26 0.1006
2025-05-15 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 609,608 -13,548 -2.17 386,632 -12.90 0.1399
2025-02-12 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 623,156 43,638 7.53 443,893 -27.14 0.1506
2024-11-14 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 579,518 -115,579 -16.63 609,213 -16.61 0.2046
2024-08-14 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 695,097 -41,436 -5.63 730,568 3.06 0.2548
2024-05-14 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 736,533 -7,684 -1.03 708,906 8.46 0.2509
2024-02-14 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 744,217 51,959 7.51 653,638 14.73 0.2515
2023-11-14 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 692,258 4,399 0.64 569,701 15.26 0.2423
2023-08-15 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 687,859 74,973 12.23 494,254 -1.85 0.2017
2023-05-15 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 612,886 7,708 1.27 503,590 15.34 0.2158
2023-02-15 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 605,178 -48,195 -7.38 436,630 -2.99 0.1965
2022-11-15 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 653,373 -672 -0.10 450,089 16.41 0.2179
2022-08-15 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 654,045 76,176 13.18 386,626 -4.20 0.1766
2022-05-13 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 577,869 7,749 1.36 403,595 12.10 0.1557
2022-02-14 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 570,120 68,434 13.64 360,042 18.59 0.1273
2021-11-10 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 501,686 -378,465 -43.00 303,610 -38.24 0.1198
2021-07-30 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 880,151 -1,197,100 -57.63 491,600 -49.98 0.1973
2021-05-06 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 2,077,251 313,907 17.80 982,831 15.37 0.4310
2021-02-08 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,763,344 208,936 13.44 851,889 -2.10 0.4020
2020-11-12 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,554,408 11,662 0.76 870,127 -9.56 0.4683
2020-08-13 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,542,746 -281,790 -15.44 962,134 8.00 0.5654
2020-05-14 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,824,536 -128,021 -6.56 890,903 21.52 0.6387
2020-02-18 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,952,557 -172,219 -8.11 733,146 24.39 0.4166
2019-11-14 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,124,776 599,187 39.28 589,413 23.43 0.3670
2019-08-14 2019-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,525,589 372,238 32.27 477,509 0.83 0.2967
2019-05-14 2019-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,153,351 -104,355 -8.30 473,589 0.82 0.3082
2019-02-13 2018-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,257,706 234,112 22.87 469,753 13.58 0.3488
2018-11-08 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,023,594 269,696 35.77 413,573 59.01 0.2701
2018-08-13 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 753,898 533,434 241.96 260,087 242.58 0.1810
2018-05-14 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 220,464 -10,681 -4.62 75,919 -12.64 0.0549
2018-02-13 2017-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 231,145 11,324 5.15 86,901 -11.58 0.0622
2017-11-13 2017-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 219,821 -14,543 -6.21 98,286 -14.61 0.0736
2017-08-10 2017-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 234,364 413 0.18 115,106 26.97 0.0890
2017-05-11 2017-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 233,951 9,759 4.35 90,658 10.16 0.0722
2017-02-13 2016-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 224,192 -17,963 -7.42 82,299 -15.46 0.0686
2016-11-10 2016-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 242,155 -2,829 -1.15 97,351 13.79 0.0822
2016-08-11 2016-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 244,984 -1,779 -0.72 85,556 -3.81 0.0737
2016-05-13 2016-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 246,763 52,033 26.72 88,943 -15.86 0.0756
2016-02-16 2015-12-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 194,730 44,646 29.75 105,713 51.43 0.0900
2016-02-12 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 194,730 90,577
2015-11-13 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 150,084 1,124 0.75 69,810 -8.13 0.0599
2015-08-14 2015-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 148,960 1,486 1.01 75,989 14.13 0.0628
2015-05-13 2015-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 147,474 -2,350 -1.57 66,582 8.33 0.0540
2015-02-13 2014-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 149,824 95 0.06 61,465 13.87 0.0510
2014-11-13 2014-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 149,729 -5,262 -3.40 53,980 23.30 0.0455
2014-08-13 2014-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 154,991 -13,074 -7.78 43,780 -13.25 0.0369
2014-05-13 2014-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 168,065 2,788 1.69 50,467 10.94 0.0436
2014-02-13 2013-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 165,277 897 0.55 45,491 -11.55 0.0407
2013-11-14 2013-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 164,380 -1,178 -0.71 51,430 38.14 0.0508
2013-08-13 2013-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 165,558 165,558 37,231 0.0395
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.