WESTFIELD CAPITAL MANAGEMENT CO LP
Position in MTSI — MACOM Technology Solutions Holdings, Inc.
CIK 1177719
BOSTON, MA
Position in MTSI
as of Jun 30, 2026
· filed Aug 12, 2026
Position Value
$66,926,862
+$37,512,137 QoQ
Shares Held
175,952
+32.8% QoQ
Ownership
0.230%
of shares outstanding
% of Portfolio
0.22%
of 13F equity value
Holder Rank
#65
of 655 holders
Holding Since
Sep 2022
14 quarters on record
Voting authority
Sole 90%
Shared 0%
None 10%
Common Shares in MTSI Over Time
Shares Held
Position Value (USD)
Position in Semiconductors
Technology · as of Jun 30, 2026WESTFIELD CAPITAL MANAGEMENT CO LP holds $3,892,895,572 across 19 Semiconductors names. MTSI ranks #9 (1.7% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | NVDA |
Nvidia Corp
|
8,079,926 | $1,616,712,393 | |
| 2 | AVGO |
Broadcom Inc.
|
1,556,522 | $587,976,185 | |
| 3 | MU |
Micron Technology Inc
|
228,203 | $263,412,440 | |
| 4 | TSM |
Taiwan Semiconductor Manufacturing Co Ltd
|
510,999 | $244,037,792 | |
| 5 | AMD |
Advanced Micro Devices Inc
|
403,081 | $234,153,783 | |
| 6 | SMTC |
Semtech Corp
|
1,133,268 | $183,419,425 | |
| 7 | MCHP |
Microchip Technology Inc
|
1,639,111 | $149,486,923 | |
| 8 | ALAB |
Astera Labs, Inc.
|
249,299 | $120,416,402 |
All Filings in MTSI
Export CSV
14 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $66,926,862 | 175,952 | Shares | Sole | 2026-08-12 | |
| 2026-03-31 | $29,414,725 | 132,457 | Shares | Sole | 2026-05-11 | |
| 2025-12-31 | $39,581,609 | 231,093 | Shares | Sole | 2026-02-11 | |
| 2025-09-30 | $54,339,387 | 436,496 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $101,654,654 | 709,433 | Shares | Sole | 2025-08-12 | |
| 2025-03-31 | $72,464,723 | 721,904 | Shares | Sole | 2025-05-09 | |
| 2024-12-31 | $128,699,108 | 990,679 | Shares | Sole | 2025-02-11 | |
| 2024-09-30 | $134,685,459 | 1,210,547 | Shares | Sole | 2024-11-12 | |
| 2024-06-30 | $111,514,142 | 1,000,396 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $42,203,062 | 441,270 | Shares | Sole | 2024-05-10 | |
| 2023-12-31 | $42,761,833 | 460,052 | Shares | Sole | 2024-02-09 | |
| 2023-06-30 | $25,646,345 | 391,368 | Shares | Sole | 2023-08-11 | |
| 2023-03-31 | $21,346,854 | 301,339 | Shares | Sole | 2023-05-12 | |
| 2022-09-30 | $17,003,174 | 328,310 | Shares | Sole | 2022-11-14 | |
| No filing history on record for this holder in this stock. | ||||||