WESTFIELD CAPITAL MANAGEMENT CO LP
Position in ADPT — Adaptive Biotechnologies Corp
CIK 1177719
BOSTON, MA
Position in ADPT
as of Jun 30, 2026
· filed Aug 12, 2026
Position Value
$0
+$0 QoQ
Shares Held
1,066,911
-21.5% QoQ
Ownership
0.669%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Dec 2025
3 quarters on record
Voting authority
Sole 92%
Shared 0%
None 8%
Common Shares in ADPT Over Time
Shares Held
Position Value (USD)
Position in Diagnostics & Research
Healthcare · as of Jun 30, 2026WESTFIELD CAPITAL MANAGEMENT CO LP holds $584,012,441 across 7 Diagnostics & Research names. ADPT ranks #7 (0.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | GH |
Guardant Health, Inc.
|
1,624,459 | $243,717,583 | |
| 2 | NTRA |
Natera, Inc.
|
726,628 | $197,243,170 | |
| 3 | IDXX |
Idexx Laboratories Inc /De
|
139,925 | $73,662,117 | |
| 4 | RDNT |
RadNet, Inc.
|
975,542 | $60,161,675 | |
| 5 | TMO |
Thermo Fisher Scientific Inc.
|
14,214 | $7,126,331 | |
| 6 | DHR |
Danaher Corp /De/
|
11,033 | $2,101,565 | |
| 7 | ADPT |
Adaptive Biotechnologies Corp
This page
|
1,066,911 | $0 |
All Filings in ADPT
Export CSV
3 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | — | 4,267,645 | Shares | Sole | 2026-08-12 | |
| 2026-03-31 | — | 5,436,718 | Shares | Sole | 2026-05-11 | |
| 2025-12-31 | — | 4,060,481 | Shares | Sole | 2026-02-11 | |
| No filing history on record for this holder in this stock. | ||||||