Adtran, Inc. 401(k) Plan
What public Form 5500 filings show about the Adtran, Inc. 401(k) plan — and how to find and check your own account.
The Adtran, Inc. 401(k) on its latest Form 5500
Adtran, Inc. (EIN 63-0918200) reports ADTRAN, INC. 401(K) RETIREMENT PLAN on its most recent Form 5500, with $428.5M in plan assets across 866 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 Adtran, Inc. filing — schedules, fees, and providers.
Who runs the Adtran, Inc. 401(k)?
The plan’s recordkeeper — the firm that runs the website and statements where you check your balance, change contributions, and manage your account — is Fidelity, based on the plan’s Schedule C service-provider disclosure. That’s the login you use for your Adtran, Inc. 401(k).
Other service providers named on the filing (investment managers, trustees, auditors — not necessarily the recordkeeper): WARREN AVERETT, MERRIL LYNCH, STRATEGIC ADVISORS.
How to check your Adtran, Inc. 401(k)
- Log in to Fidelity’s participant portal (the site on your statements).
- Ask Adtran, Inc. HR or benefits for the recordkeeper name and enrollment link.
- Left the company? Your balance stays in the plan until you roll it over — see how to find a lost 401(k).

