Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionBartlett & Co. Wealth Management Llc
Latest Disclosed Ownership362 shares
Latest Disclosed Value $ 256,734
Bartlett & Co. Wealth Management Llc reports 0.28% increase in ownership of REGN / Regeneron Pharmaceuticals, Inc.

On May 6, 2026 - Bartlett & Co. Wealth Management Llc filed a 13F-HR form disclosing ownership of 362 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $256,734 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 22, 2026 disclosing 361 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 0.28% 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 Pharms COM 75886F107 362 1 0.28 257 -7.91 0.0031
2026-01-22 2025-12-31 13F Regeneron Pharms COM 75886F107 361 0 0.00 279 37.62 0.0036
2025-10-09 2025-09-30 13F Regeneron Pharms COM 75886F107 361 14 4.03 203 10.99 0.0027
2025-07-18 2025-06-30 13F Regeneron Pharms COM 75886F107 347 3 0.87 182 -16.51 0.0025
2025-04-24 2025-03-31 13F Regeneron Pharms COM 75886F107 344 0 0.00 218 -11.02 0.0032
2025-01-17 2024-12-31 13F Regeneron Pharms COM 75886F107 344 0 0.00 245 -32.13 0.0036
2024-10-17 2024-09-30 13F Regeneron Pharms COM 75886F107 344 0 0.00 362 0.00 0.0052
2024-07-12 2024-06-30 13F Regeneron Pharms COM 75886F107 344 -2 -0.58 362 8.41 0.0055
2024-05-09 2024-03-31 13F Regeneron Pharms COM 75886F107 346 2 0.58 333 9.90 0.0051
2024-02-14 2023-12-31 13F Regeneron Pharms COM 75886F107 344 0 0.00 303 7.07 0.0049
2024-02-14 2023-09-30 13F Regeneron Pharms COM 75886F107 344 0 0.00 283 14.57 0.0051
2024-02-14 2023-06-30 13F Regeneron Pharms COM 75886F107 344 0 0.00 247 -12.41 0.0043
2024-02-14 2023-03-31 13F Regeneron Pharms COM 75886F107 344 0 0.00 283 13.71 0.0055
2024-02-14 2022-12-31 13F Regeneron Pharms COM 75886F107 344 0 0.00 248 5.08 0.0050
2024-02-14 2022-09-30 13F Regeneron Pharms COM 75886F107 344 0 0.00 237 16.26 0.0051
2024-02-14 2022-06-30 13F Regeneron Pharms COM 75886F107 344 0 0.00 203 -15.42 0.0041
2024-02-14 2022-03-31 13F Regeneron Pharms COM 75886F107 344 0 0.00 240 10.60 0.0042
2024-02-14 2021-12-31 13F Regeneron Pharms COM 75886F107 344 0 0.00 217 4.33 0.0037
2024-02-14 2021-09-30 13F Regeneron Pharmaceuticals COM 75886F107 344 -9 -2.55 208 5.58 0.0040
2024-02-14 2021-06-30 13F Regeneron Pharmaceuticals COM 75886F107 353 0 0.00 197 17.96 0.0038
2024-02-14 2021-03-31 13F Regeneron Pharmaceuticals COM 75886F107 353 0 0.00 167 -1.76 0.0034
2024-02-13 2020-12-31 13F Regeneron Pharmaceuticals COM 75886F107 353 9 2.62 171 -11.46 0.0036
2024-02-13 2020-09-30 13F Regeneron Pharmaceuticals COM 75886F107 344 0 0.00 193 -10.28 0.0045
2024-02-13 2020-06-30 13F Regeneron Pharmaceuticals COM 75886F107 344 135 64.59 215 109.80 0.0056
2024-02-13 2020-03-31 13F Regeneron Pharmaceuticals COM 75886F107 209 0 0.00 102 30.77 0.0031
2024-02-13 2019-12-31 13F Regeneron Pharmaceuticals COM 75886F107 209 0 0.00 78 36.84 0.0019
2024-02-13 2019-09-30 13F Regeneron Pharmaceuticals COM 75886F107 209 168 409.76 58 375.00 0.0015
2024-02-13 2019-06-30 13F Regeneron Pharmaceuticals COM 75886F107 41 1 2.50 13 -25.00 0.0005
2024-02-13 2019-03-31 13F Regeneron Pharmaceuticals COM 75886F107 40 0 0.00 16 14.29 0.0006
2024-02-13 2018-12-31 13F Regeneron Pharmaceuticals COM 75886F107 40 0 0.00 15 -12.50 0.0006
2024-02-13 2018-09-30 13F Regeneron Pharmaceuticals COM 75886F107 40 0 0.00 16 23.08 0.0006
2024-02-13 2018-06-30 13F Regeneron Pharmaceuticals COM 75886F107 40 0 0.00 14 0.00 0.0006
2024-02-13 2018-03-31 13F Regeneron Pharmaceuticals COM 75886F107 40 40 14 0.0006
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.