FRONTIER CAPITAL MANAGEMENT CO LLC
Position in MPWR — Monolithic Power Systems, Inc.
CIK 351173
Boston, MA
Position in MPWR
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$45,234,966
-$41,903,935 QoQ
Shares Held
32,723
-58.9% QoQ
Ownership
0.067%
of shares outstanding
% of Portfolio
0.42%
of 13F equity value
Holder Rank
#143
of 1,244 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in MPWR Over Time
Shares Held
Position Value (USD)
Position in Semiconductors
Technology · as of Jun 30, 2026FRONTIER CAPITAL MANAGEMENT CO LLC holds $489,015,907 across 13 Semiconductors names. MPWR ranks #4 (9.3% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | LSCC |
Lattice Semiconductor Corp
|
821,848 | $125,709,870 | |
| 2 | ALAB |
Astera Labs, Inc.
|
154,601 | $74,675,375 | |
| 3 | INDI |
indie Semiconductor, Inc.
|
15,914,169 | $71,454,618 | |
| 4 | MPWR |
Monolithic Power Systems, Inc.
This page
|
32,723 | $45,234,966 | |
| 5 | CRDO |
Credo Technology Group Holding Ltd
|
149,509 | $40,658,972 | |
| 6 | MTSI |
MACOM Technology Solutions Holdings, Inc.
|
67,363 | $25,622,864 | |
| 7 | NXPI |
NXP Semiconductors N.V.
|
84,778 | $23,825,161 | |
| 8 | ALGM |
Allegro Microsystems, Inc.
|
330,904 | $23,037,536 |
All Filings in MPWR
Export CSV
26 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $45,234,966 | 32,723 | Shares | Sole | 2026-08-14 | |
| 2026-03-31 | $87,138,901 | 79,699 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $76,241,190 | 84,118 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $150,907,626 | 163,916 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $97,158,713 | 132,843 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $74,656,185 | 128,722 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $88,431,340 | 149,453 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $131,940,942 | 142,716 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $104,721,472 | 127,448 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $92,230,055 | 136,149 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $123,648,649 | 196,025 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $83,512,044 | 180,762 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $123,501,440 | 228,609 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $71,057,659 | 141,962 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $48,714,020 | 137,762 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 | $35,833,057 | 98,605 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $39,237,366 | 102,170 | Shares | Sole | 2022-07-20 | |
| 2022-03-31 | $10,915,172 | 22,474 | Shares | Sole | 2022-04-14 | |
| 2021-12-31 | $11,125,578 | 22,552 | Shares | Sole | 2022-01-19 | |
| 2021-09-30 | $13,451,808 | 27,754 | Shares | Sole | 2021-10-19 | |
| 2021-06-30 | $15,521,702 | 41,563 | Shares | Sole | 2021-08-09 | |
| 2021-03-31 | $12,611,363 | 35,705 | Shares | Sole | 2021-05-13 | |
| 2020-12-31 | $19,214,256 | 52,465 | Shares | Sole | 2021-01-19 | |
| 2020-09-30 | $74,222,194 | 265,449 | Shares | Sole | 2020-11-16 | |
| 2020-06-30 | $85,904,205 | 362,465 | Shares | Sole | 2020-07-17 | |
| 2020-03-31 | $76,527,545 | 456,990 | Shares | Sole | 2020-04-16 | |
| No filing history on record for this holder in this stock. | ||||||