Mercury Systems, Inc. 401(k) Plan: Login, Facts & Contact Information
Mercury Systems, Inc. 401(k) Login
1,065 former Mercury Systems, Inc. employees still have money in this plan.
Retirement plan providers can change. This information is from the plan's 2024 filing.
Mercury Systems, Inc. 401(k) Plan Facts
Source: Form 5500 for plan year 2024 (Jan 1, 2024 – Dec 31, 2024), filed Oct 14, 2025. Public filing with the U.S. Department of Labor.
Money in and out in plan year 2024
- $48.1 million went into the plan in contributions, $15.8 million of it from the employer (33%).
- $72.3 million was paid out to participants.
- Investment and other income added $59.3 million.
How the Mercury Systems, Inc. 401(k) changed, 2019–2024
| Plan year | Participants | Plan assets | Employer contributions | Benefits paid |
|---|---|---|---|---|
| 2019 | 1,745 | $235.4 million | $4.55 million | $14.5 million |
| 2020 | 2,089 | $306.7 million | $5.64 million | $15.3 million |
| 2021 | 2,407 | $414.5 million | $6.31 million | $34.4 million |
| 2022 | 2,817 | $369.7 million | $10.9 million | $26.0 million |
| 2023 | 3,242 | $440.5 million | $19.3 million | $41.3 million |
| 2024 | 3,412 | $475.6 million | $15.8 million | $72.3 million |
Mercury Systems, Inc. 401(k) Contact Information
Questions about the Mercury Systems, Inc. 401(k)
Does Mercury Systems, Inc contribute to the 401(k)?
Yes. The plan reports an employer contribution arrangement. In plan year 2024 the employer contributed $15.8 million, 33% of all contributions.
Does the Mercury Systems, Inc 401(k) have automatic enrollment?
Yes. The plan reports automatic enrollment of eligible employees.
How many people are in the Mercury Systems, Inc 401(k) plan?
3,412 participants at the start of plan year 2024, 2,246 of them active employees, and 1,065 former employees who still had money in the plan.
What is the average 401(k) balance at Mercury Systems, Inc?
About $144,831 per account: $475.6 million in plan assets across 3,284 accounts with a balance at the end of plan year 2024.
Who manages the Mercury Systems, Inc 401(k) accounts?
Fidelity NetBenefits (listed on the filing as FIDELITY INVESTMENTS INSTITUTIONAL) is the plan's recordkeeper, which is where participants log in to see their balance.
I no longer work at Mercury Systems, Inc. How do I access my 401(k)?
Your account stays with Fidelity NetBenefits after you leave, so you can log in with the same credentials. If your balance was small, the plan may have rolled it into an IRA in your name. If you can't find it, Beagle can locate it for you.