Quick Takeaways
- BlackRock, Inc. filed SCHEDULE 13G/A for MONOLITHIC POWER SYSTEMS INC Common Stock (MPWR).
- Disclosed ownership: 10%.
- Date of event: 31 Dec 2025.
BlackRock, Inc. - 31 Dec 2025 SCHEDULE 13G/A Report for MONOLITHIC POWER SYSTEMS INC Common Stock (MPWR)
- Filing Manager
- BlackRock, Inc.
- Reporting Manager
- BlackRock, Inc.
- Symbol
- MPWR
- Shares outstanding
- 48,033,167 shares
- Disclosed Ownership
- 4,899,383 shares
- Ownership
- 10%
- Form type
- SCHEDULE 13G/A
- Filing time
- 08 Jan 2026, 13:28:03 UTC
- Date of event
- 31 Dec 2025
- Previous filing
- 17 Apr 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"BlackRock, Inc. disclosed 10% ownership in MONOLITHIC POWER SYSTEMS INC Common Stock (MPWR) on 31 Dec 2025."
What Changed
- Previous schedule filing date: 17 Apr 2025.
- Current filing was accepted on 08 Jan 2026, 13:28.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Official SEC Source
Backed by Schedule 13D/13G
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
See Original FilingReporting Managers (1)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 10% | 4,899,383 | 4,567,525 | 0 | Spencer Fleming | Managing Director |