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FRONTIER CAPITAL MANAGEMENT CO LLC

Position in MPWR — Monolithic Power Systems, Inc.

CIK 351173 Boston, MA

Position in MPWR

as of Mar 31, 2026 · filed May 15, 2026
Position Value
$87,138,901
+$10,897,711 QoQ
Shares Held
79,699
-5.3% QoQ
Ownership
0.162%
of shares outstanding
% of Portfolio
0.90%
of 13F equity value
Holder Rank
not a current holder
Holding Since
Mar 2020
25 quarters on record
Voting authority Sole 79% Shared 0% None 21%

Common Shares in MPWR Over Time

Shares Held

Position Value (USD)

Position in Semiconductors

Technology · as of Mar 31, 2026

FRONTIER CAPITAL MANAGEMENT CO LLC holds $500,506,781 across 15 Semiconductors names. MPWR ranks #1 (17.4% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 MPWR
Monolithic Power Systems, Inc.
This page
79,699 $87,138,901

All Filings in MPWR

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25 filing rows on record
Report Date Value (USD) Shares
2026-03-31 $87,138,901 79,699
2025-12-31 $76,241,190 84,118
2025-09-30 $150,907,626 163,916
2025-06-30 $97,158,713 132,843
2025-03-31 $74,656,185 128,722
2024-12-31 $88,431,340 149,453
2024-09-30 $131,940,942 142,716
2024-06-30 $104,721,472 127,448
2024-03-31 $92,230,055 136,149
2023-12-31 $123,648,649 196,025
2023-09-30 $83,512,044 180,762
2023-06-30 $123,501,440 228,609
2023-03-31 $71,057,659 141,962
2022-12-31 $48,714,020 137,762
2022-09-30 $35,833,057 98,605
2022-06-30 $39,237,366 102,170
2022-03-31 $10,915,172 22,474
2021-12-31 $11,125,578 22,552
2021-09-30 $13,451,808 27,754
2021-06-30 $15,521,702 41,563
2021-03-31 $12,611,363 35,705
2020-12-31 $19,214,256 52,465
2020-09-30 $74,222,194 265,449
2020-06-30 $85,904,205 362,465
2020-03-31 $76,527,545 456,990