Find an old 401(k) · Free

Mission Support and Test Services LLC: who to call about your old retirement account

Mission Support and Test Services LLC (msts) Represented Employee 401(K) Plan. LAS VEGAS, NV. From the plan’s 2025 filing with the U.S. Department of Labor.

Good news: this plan is still running.

It filed for 2025, so if you left money in it, the account should still be there under your name. One phone call usually finds it.

Is this your plan?

From the plan’s public filings. Check that it sounds like the place you worked.

Employer: Mission Support and Test Services LLC
Address on file: PO Box 98521 M/S Nlv010 · Las Vegas, NV · 89193
Industry: Professional, Scientific & Technical Services
Plan: Mission Support and Test Services LLC (msts) Represented Employee 401(K) Plan401(k) plan
When: Start date on the filing: 1989Still running: latest filing is for 2025Has filed since 2017
Size: about 1,000 people in the plan, about $59 million in total82 of them no longer work there and still have money in it. Leaving a balance behind is common.
You may remember: • Had a Roth option
• Covers union employees

Not the right one? Mission Support and Test Services LLC has 3 other retirement plans:

Mission Support and Test Services LLC (msts) Employee Retirement Plan · Retirement savings plan · about 6,700 people · filed 2024
Mission Support and Test Services LLC (msts) Employee 401(K) Plan · 401(k) plan · about 3,200 people · filed 2025
Nnss Staff Pension Plan · Pension plan · about 330 people · filed 2023

Doesn’t sound like it? Search again. Try the company’s legal name, or the name it had when you worked there.

Get this plan’s contact details, free

Tell us where to send them and we’ll email you a link that opens:

✓ The phone number on the plan’s filing
✓ What to say on the call, word for word
✓ The plan ID numbers they will ask you for

If nobody can find you

These official and non-profit registries are free:

DOL Abandoned Plan Search ↗
plans wound down by a custodian after the employer walked away
DOL Retirement Savings Lost & Found ↗
the Department of Labor’s registry of accounts owed to former participants
National Registry of Unclaimed Retirement Benefits ↗
employers and plan administrators list balances they could not deliver
Your state’s unclaimed property office ↗
uncashed distribution checks often end up here

Want a licensed advisor to help?

Optional, free, and no obligation. An advisor can help you track the account down, then roll it into an IRA or your current employer’s plan and keep it invested. You do not need this to use anything above.

Your name

Phone (optional)

What do you want to do with it?

Roughly how much is in the account? (optional)

Anything we should know? (optional)

I am asking 401kHunter to connect me with a licensed financial advisor about my old retirement account. I agree that 401kHunter may share my request and contact details with the one licensed advisor it matches me with, and that 401kHunter and that advisor may email me about it. The advisor may pay 401kHunter for the introduction. This is free for me and I am under no obligation. My details will not be used for anything else, or sold or shared with anyone else, without my consent.

401kHunter is not affiliated with, endorsed by, or connected to MISSION SUPPORT AND TEST SERVICES LLC. Plan figures on this page come from public U.S. Department of Labor Form 5500 filings and reflect the plan’s final reported year. This page is educational and is not investment, tax, or legal advice.