WESTFIELD CAPITAL MANAGEMENT CO LP
Position in TMO — Thermo Fisher Scientific Inc.
CIK 1177719
BOSTON, MA
Position in TMO
as of Mar 31, 2026
· filed May 11, 2026
Position Value
$6,622,875
-$1,304,580 QoQ
Shares Held
13,474
-1.5% QoQ
Ownership
0.004%
of shares outstanding
% of Portfolio
0.03%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
25 quarters on record
Voting authority
Sole 96.47469199940626.ToString("F0")%
Shared 0.ToString("F0")%
None 3.525308000593736.ToString("F0")%
Common Shares in TMO Over Time
Shares Held
Position Value (USD)
Position in Diagnostics & Research
Healthcare · as of Mar 31, 2026WESTFIELD CAPITAL MANAGEMENT CO LP holds $572,134,101 across 8 Diagnostics & Research names. TMO ranks #8 (1.2% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | NTRA |
Natera, Inc.
|
754,729 | $150,938,252 | |
| 2 | GH |
Guardant Health, Inc.
|
1,362,539 | $125,857,727 | |
| 3 | WGS |
GeneDx Holdings Corp.
|
1,369,108 | $87,924,115 | |
| 4 | ADPT |
Adaptive Biotechnologies Corp
|
5,436,718 | $75,461,645 | |
| 5 | IDXX |
Idexx Laboratories Inc /De
|
132,860 | $74,652,705 | |
| 6 | RDNT |
RadNet, Inc.
|
531,893 | $29,727,499 | |
| 7 | DHR |
Danaher Corp /De/
|
110,492 | $20,949,283 | |
| 8 | TMO |
Thermo Fisher Scientific Inc.
This page
|
13,474 | $6,622,875 |
All Filings in TMO
Export CSV
25 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $6,622,875 | 13,474 | Shares | Sole | 2026-05-11 | |
| 2025-12-31 | $7,927,455 | 13,681 | Shares | Sole | 2026-02-11 | |
| 2025-09-30 | $6,635,558 | 13,681 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $5,524,797 | 13,626 | Shares | Sole | 2025-08-12 | |
| 2025-03-31 | $7,133,096 | 14,335 | Shares | Sole | 2025-05-09 | |
| 2024-12-31 | $7,735,299 | 14,869 | Shares | Sole | 2025-02-11 | |
| 2024-09-30 | $10,498,370 | 16,972 | Shares | Sole | 2024-11-12 | |
| 2024-06-30 | $10,017,042 | 18,114 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $10,249,057 | 17,634 | Shares | Sole | 2024-05-10 | |
| 2023-12-31 | $10,117,918 | 19,062 | Shares | Sole | 2024-02-09 | |
| 2023-09-30 | $10,873,037 | 21,481 | Shares | Sole | 2023-11-13 | |
| 2023-06-30 | $25,363,832 | 48,613 | Shares | Sole | 2023-08-11 | |
| 2023-03-31 | $86,461,263 | 150,010 | Shares | Sole | 2023-05-12 | |
| 2022-12-31 | $104,317,206 | 189,430 | Shares | Sole | 2023-02-13 | |
| 2022-09-30 | $99,399,096 | 195,980 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $107,930,177 | 198,664 | Shares | Sole | 2022-08-12 | |
| 2022-03-31 | $122,051,325 | 206,639 | Shares | Sole | 2022-05-16 | |
| 2021-12-31 | $125,993,594 | 188,828 | Shares | Sole | 2022-02-10 | |
| 2021-09-30 | $133,002,196 | 232,794 | Shares | Sole | 2021-11-12 | |
| 2021-06-30 | $176,275,943 | 349,428 | Shares | Sole | 2021-08-10 | |
| 2021-03-31 | $164,538,681 | 360,530 | Shares | Sole | 2021-05-14 | |
| 2020-12-31 | $166,375,684 | 357,198 | Shares | Sole | 2021-02-12 | |
| 2020-09-30 | $187,859,695 | 425,484 | Shares | Sole | 2020-11-13 | |
| 2020-06-30 | $164,714,691 | 454,586 | Shares | Sole | 2020-08-13 | |
| 2020-03-31 | $130,161,339 | 458,961 | Shares | Sole | 2020-05-14 | |
| No filing history on record for this holder in this stock. | ||||||