How to Find a Lost 401(k) From an Old Job (2026 Guide)

Lost track of an old 401(k)? You're not alone

When you change jobs, it's easy to leave a 401(k) behind — and easy to forget it entirely. The money is still yours, including vested employer contributions; it just has to be tracked down.

The scale of the problem (per Capitalize's research): as of 2025 there were roughly 29–32 million abandoned 401(k) accounts in the U.S., holding on the order of $2.1 trillion in assets — driven by job switching and layoffs. So a forgotten account is common, and recoverable.

Here's how to find yours, from easiest to most thorough.

1. Check your old statements and email

Start with what you already have. Old 401(k) statements — paper or in your email — list your account number and the plan administrator's contact info, which is the fastest route back in. Search your inbox for the provider's name (Fidelity, Vanguard, Empower, etc.) and any onboarding or exit paperwork from the employer.

2. Contact your former employer

If you don't have statements, go to the source. Reach out to the former employer's HR or benefits department with your full name, Social Security number, and dates of employment. They can confirm whether you participated and connect you with the plan's recordkeeper.

3. Look up the company's Form 5500 (works even if the employer is gone)

This is the method most people don't know — and it's the most powerful, especially if your old employer merged, was acquired, or went out of business.

Every ERISA-covered plan files an annual Form 5500 with the U.S. Department of Labor, and those filings are public. The filing lists the plan administrator and sponsor contact information — exactly who to call to claim an account — plus the plan's recordkeeper and service providers.

Unlike the government's EFAST2 site, you don't need to register or wade through raw filings — search the company name and read the contact details directly.

4. Search the federal databases

Several official databases exist specifically for lost retirement money:

• DOL Retirement Savings Lost and Found — launched under SECURE 2.0 to help people locate private-sector pension and 401(k) accounts tied to their Social Security number (identity verification via Login.gov required).
• National Registry of Unclaimed Retirement Benefits (UnclaimedRetirementBenefits.com) — a free database of unclaimed accounts.
• DOL Abandoned Plan Database — for plans that have been terminated or abandoned.
• State unclaimed property offices — where some old account funds eventually escheat.

Checking more than one increases your odds.

5. Use your Social Security number as the thread

Your SSN ties your participation records together across employers. Both former-employer HR and the federal databases above use it to match you to accounts — have it ready.

Once you find it: what to do next

Located the account? You generally have a few options — leave it where it is, roll it into your current employer's plan, or roll it into an IRA — each with different tax and fee implications. Consider all of them (and any costs) before moving money, or talk to a qualified advisor.