Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionHartland & Co., LLC
Latest Disclosed Ownership1,134 shares
Latest Disclosed Value $ 876,478
Hartland & Co., LLC reports 2.35% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 6, 2026 - Hartland & Co., LLC filed a 13F-HR form disclosing ownership of 1,134 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $876,478 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 1,108 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 2.35% 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)
2026-05-06 2026-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,134 26 2.35 876 2.46 0.0080
2026-02-09 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,108 223 25.20 856 72.03 0.0108
2025-11-10 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 885 446 101.59 498 116.09 0.0065
2025-08-08 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 439 -112 -20.33 230 -34.10 0.0032
2025-05-13 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 551 41 8.04 349 -3.86 0.0054
2025-02-10 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 510 29 6.03 363 -28.12 0.0055
2024-11-13 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 481 -23 -4.56 506 -4.54 0.0078
2024-08-12 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 504 71 16.40 530 25.06 0.0090
2024-05-14 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 433 -46 -9.60 423 0.71 0.0209
2024-02-12 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 479 17 3.68 421 10.53 0.0223
2023-11-13 2023-09-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 462 -17 -3.55 380 10.47 0.0234
2023-11-07 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 462 -17 380 0.0209
2023-08-07 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 479 25 5.51 344 -7.77 0.0209
2023-05-09 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 454 128 39.26 373 58.72 0.0272
2023-02-14 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 326 27 9.03 235 14.08 0.0184
2022-11-15 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 299 0 0.00 206 16.38 0.0190
2022-08-12 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 299 0 0.00 177 -15.31 0.0138
2022-05-04 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 299 0 0.00 209 10.58 0.0142
2022-02-14 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 299 217 264.63 189 278.00 0.0129
2021-11-12 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 82 0 0.00 50 8.70 0.0037
2021-08-12 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 82 -22 -21.15 46 -6.12 0.0035
2021-05-14 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 104 35 50.72 49 48.48 0.0041
2021-02-11 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 69 2 2.99 33 -13.16 0.0030
2020-11-12 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 67 15 28.85 38 18.75 0.0041
2020-08-11 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 52 0 0.00 32 28.00 0.0037
2020-05-14 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 52 52 25 0.0036
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.