What public Form 5500 filings show about the Mainstream Engineering Corporation 401(k) plan — and how to find and check your own account.
Mainstream Engineering Corporation (EIN 59-2744408) reports MAINSTREAM ENGINEERING CORPORATION 401(K) SAVINGS PLAN on its most recent Form 5500, with $16.4M in plan assets across 173 active participants. Form 5500 is the annual report employers file with the U.S. Department of Labor for their retirement plans, and it’s public.
See the full Mainstream Engineering Corporation filing — schedules, fees, and providers.
The plan’s recordkeeper — the firm that runs the website and statements where you check your balance, change contributions, and manage your account — is Principal, based on the plan’s Schedule C service-provider disclosure. That’s the login you use for your Mainstream Engineering Corporation 401(k).
