Position in GH
as of Jun 30, 2026
· filed Aug 12, 2026
Position Value
$243,717,583
+$117,859,856 QoQ
Shares Held
1,624,459
+19.2% QoQ
Ownership
1.21%
of shares outstanding
% of Portfolio
0.80%
of 13F equity value
Holder Rank
#21
of 594 holders
Holding Since
Mar 2022
6 quarters on record
Voting authority
Sole 92%
Shared 0%
None 8%
Common Shares in GH 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. GH ranks #1 (41.7% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | GH |
Guardant Health, Inc.
This page
|
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
|
1,066,911 | $0 |
All Filings in GH
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6 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $243,717,583 | 1,624,459 | Shares | Sole | 2026-08-12 | |
| 2026-03-31 | $125,857,727 | 1,362,539 | Shares | Sole | 2026-05-11 | |
| 2025-12-31 | $55,072,866 | 539,190 | Shares | Sole | 2026-02-11 | |
| 2022-09-30 | $31,306,935 | 581,589 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $22,996,341 | 570,063 | Shares | Sole | 2022-08-12 | |
| 2022-03-31 | $10,289,854 | 155,342 | Shares | Sole | 2022-05-16 | |
| No filing history on record for this holder in this stock. | ||||||