Chesley Taft & Associates LLC
Position in REGN — Regeneron Pharmaceuticals, Inc.
CIK 1164632
CHICAGO, IL
Position in REGN
as of Jun 30, 2026
· filed Jul 8, 2026
Position Value
$273,734
-$63,909 QoQ
Shares Held
439
+0.5% QoQ
Ownership
0.000%
of shares outstanding
% of Portfolio
0.01%
of 13F equity value
Holder Rank
#965
of 1,322 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority
Sole 5%
Shared 0%
None 95%
Common Shares in REGN Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Jun 30, 2026Chesley Taft & Associates LLC holds $811,194 across 2 Biotechnology names. REGN ranks #2 (33.7% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | VRTX |
Vertex Pharmaceuticals Inc / Ma
|
1,082 | $537,460 | |
| 2 | REGN |
Regeneron Pharmaceuticals, Inc.
This page
|
439 | $273,734 |
All Filings in REGN
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26 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $273,734 | 439 | Shares | Sole | 2026-07-08 | |
| 2026-03-31 | $337,643 | 437 | Shares | Sole | 2026-04-13 | |
| 2025-12-31 | $954,803 | 1,237 | Shares | Sole | 2026-01-14 | |
| 2025-09-30 | $244,587 | 435 | Shares | Sole | 2025-10-08 | |
| 2025-06-30 | $228,375 | 435 | Shares | Sole | 2025-07-09 | |
| 2025-03-31 | $307,601 | 485 | Shares | Sole | 2025-04-10 | |
| 2024-12-31 | $345,480 | 485 | Shares | Sole | 2025-01-17 | |
| 2024-09-30 | $509,851 | 485 | Shares | Sole | 2024-10-07 | |
| 2024-06-30 | $509,749 | 485 | Shares | Sole | 2024-07-19 | |
| 2024-03-31 | $466,807 | 485 | Shares | Sole | 2024-04-16 | |
| 2023-12-31 | $425,970 | 485 | Shares | Sole | 2024-01-11 | |
| 2023-09-30 | $399,135 | 485 | Shares | Sole | 2023-10-11 | |
| 2023-06-30 | $348,491 | 485 | Shares | Sole | 2023-07-18 | |
| 2023-03-31 | $398,509 | 485 | Shares | Sole | 2023-04-11 | |
| 2022-12-31 | $349,922 | 485 | Shares | Sole | 2023-01-20 | |
| 2022-09-30 | $334,101 | 485 | Shares | Sole | 2022-10-13 | |
| 2022-06-30 | $626,006 | 1,059 | Shares | Sole | 2022-07-07 | |
| 2022-03-31 | $718,674 | 1,029 | Shares | Sole | 2022-04-14 | |
| 2021-12-31 | $649,834 | 1,029 | Shares | Sole | 2022-01-05 | |
| 2021-09-30 | $558,581 | 923 | Shares | Sole | 2021-10-05 | |
| 2021-06-30 | $515,532 | 923 | Shares | Sole | 2021-07-07 | |
| 2021-03-31 | $462,730 | 978 | Shares | Sole | 2021-04-06 | |
| 2020-12-31 | $566,688 | 1,173 | Shares | Sole | 2021-01-11 | |
| 2020-09-30 | $656,621 | 1,173 | Shares | Sole | 2020-10-08 | |
| 2020-06-30 | $918,636 | 1,473 | Shares | Sole | 2020-07-08 | |
| 2020-03-31 | $719,251 | 1,473 | Shares | Sole | 2020-04-15 | |
| No filing history on record for this holder in this stock. | ||||||