Monolithic Power Systems 401(k) match, vesting and fees
What Monolithic Power Systems' 401(k) plan says about matching contributions
Plan features
Match, vesting and enrollment details have not been published from this plan's audit report yet. The figures below come from the structured filing.
| Recordkeeper | Fidelity Investments Institutional | Schedule C ↗ |
| Independent auditor | Silicon Valley Accountancy Corp (unmodified opinion, limited scope) | Schedule H ↗ |
| Plan type and status | 401(k) · Active | Form 5500 ↗ |
How the plan compares
Plan year 2025 medians for 408 defined-contribution plans in manufacturing with 500 to 999 participants.
| Monolithic Power Systems: employer contribution per participant | $4,507 | |
| Peer median | $2,176 |
| Monolithic Power Systems: average balance | $213,258 | |
| Peer median | $86,901 |
| Monolithic Power Systems: admin expenses ÷ assets | <0.01% | |
| Peer median | 0.16% |
Admin expenses are the plan's reported administrative expenses divided by its assets; they do not include fund expense ratios.
Plan history
Plan assets went from $64.4M at the end of plan year 2021 to $115M at the end of plan year 2025.
| Plan year | Participants | Assets | Employer contributions | Per participant | Admin expense ratio | Match formula | Filing |
|---|---|---|---|---|---|---|---|
| 2025 | 574 | $115M | $2.4M | $4,507 | <0.01% | Not published | Form 5500 ↗ |
| 2024 | 512 | $91M | $0 | $0 | — | Not published | Form 5500 ↗ |
| 2023 | 479 | $72.3M | $0 | $0 | — | Not published | Form 5500 ↗ |
| 2022 | 426 | $54.5M | $0 | $0 | — | Not published | Form 5500 ↗ |
| 2021 | 369 | $64.4M | $68 | $0 | 0.03% | Not published | Form 5500 ↗ |
Common questions
Does Monolithic Power Systems match 401(k) contributions?
The match terms for the Monolithic Power Systems, Inc. 401(k) Savings Plan have not been published from its filing yet. The plan year 2025 filing reports $2.4M in employer contributions, about $4,507 per participant. That total includes any match and profit-sharing; it is not a match formula.
When is the Monolithic Power Systems 401(k) match vested?
The vesting schedule for the Monolithic Power Systems, Inc. 401(k) Savings Plan is not in the data published so far. Your Summary Plan Description states it.
Who manages the Monolithic Power Systems 401(k)?
The recordkeeper listed on Schedule C of the plan year 2025 filing is Fidelity Investments Institutional. The plan administrator is Monolithic Power Systems, Inc..
I left Monolithic Power Systems. How do I find my old 401(k)?
Your account stays in the plan until you move it. Contact the plan administrator (Monolithic Power Systems, Inc., (408) 826-0600) or the recordkeeper, Fidelity Investments Institutional. The Monolithic Power Systems old 401(k) page lists the contacts from every plan filing. Find an old Monolithic Power Systems 401(k)
Data from the public Form 5500 annual reports Monolithic Power Systems filed with the U.S. Department of Labor (plan years 2021 and 2022 and 2023 and 2024 and 2025) and, where noted, the attached independent auditor's report. Plan terms may have changed since the filing; check your current Summary Plan Description. PlanFacts is not affiliated with Monolithic Power Systems. Not financial advice. Report a correction · Methodology