Position in MASI
as of Mar 31, 2026
· filed May 11, 2026
Position Value
$60,694,402
-$137,263,290 QoQ
Shares Held
341,229
-77.6% QoQ
Ownership
0.652%
of shares outstanding
% of Portfolio
0.25%
of 13F equity value
Holder Rank
#32
of 445 holders
Holding Since
Mar 2020
17 quarters on record
Voting authority
Sole 90.94420462504652.ToString("F0")%
Shared 0.ToString("F0")%
None 9.055795374953476.ToString("F0")%
Common Shares in MASI Over Time
Shares Held
Position Value (USD)
Position in Medical Devices
Healthcare · as of Mar 31, 2026WESTFIELD CAPITAL MANAGEMENT CO LP holds $120,408,739 across 7 Medical Devices names. MASI ranks #1 (50.4% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | MASI |
Masimo Corp
This page
|
341,229 | $60,694,402 | |
| 2 | GKOS |
GLAUKOS Corp
|
482,219 | $51,915,697 | |
| 3 | MDT |
Medtronic plc
|
60,349 | $5,229,240 | |
| 4 | DXCM |
Dexcom Inc
|
27,074 | $1,700,247 | |
| 5 | BSX |
Boston Scientific Corp
|
5,965 | $374,303 | |
| 6 | PODD |
Insulet Corp
|
1,682 | $352,950 | |
| 7 | LUNG |
Pulmonx Corp
|
110,000 | $141,900 |
All Filings in MASI
Export CSV
17 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $60,694,402 | 341,229 | Shares | Sole | 2026-05-11 | |
| 2025-12-31 | $197,957,692 | 1,522,049 | Shares | Sole | 2026-02-11 | |
| 2025-09-30 | $209,410,337 | 1,419,250 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $198,701,968 | 1,181,203 | Shares | Sole | 2025-08-12 | |
| 2025-03-31 | $111,868,401 | 671,479 | Shares | Sole | 2025-05-09 | |
| 2024-12-31 | $127,092,227 | 768,858 | Shares | Sole | 2025-02-11 | |
| 2024-09-30 | $185,869,486 | 1,394,056 | Shares | Sole | 2024-11-12 | |
| 2024-06-30 | $142,524,534 | 1,131,686 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $100,753,785 | 686,100 | Shares | Sole | 2024-05-10 | |
| 2023-12-31 | $95,933,571 | 818,476 | Shares | Sole | 2024-02-09 | |
| 2023-09-30 | $52,930,750 | 603,681 | Shares | Sole | 2023-11-13 | |
| 2023-06-30 | $156,947,625 | 953,799 | Shares | Sole | 2023-08-11 | |
| 2021-03-31 | $47,733,912 | 207,846 | Shares | Sole | 2021-05-14 | |
| 2020-12-31 | $63,724,952 | 237,443 | Shares | Sole | 2021-02-12 | |
| 2020-09-30 | $68,585,580 | 290,543 | Shares | Sole | 2020-11-13 | |
| 2020-06-30 | $69,246,718 | 303,727 | Shares | Sole | 2020-08-13 | |
| 2020-03-31 | $76,742,022 | 433,277 | Shares | Sole | 2020-05-14 | |
| No filing history on record for this holder in this stock. | ||||||