Meso Scale Diagnostics, Llc 401(k) Plan: Login, Facts & Contact Information

Meso Scale Diagnostics, Llc 401(k) Plan Facts

Plan name
MESO SCALE DIAGNOSTICS 401(K) PLAN
Plan type
401(k) with employer contributions and profit sharing
Plan sponsor
MESO SCALE DIAGNOSTICS, LLC
Participants
1,205 (1,044 active employees)
Former employees with a balance
310
Plan assets
$148,497,434 at Dec 31, 2024
Average account balance
$112,074 across 1,325 accounts
Employer contributions
$2,952,818 in plan year 2024 (18% of all contributions)
Recordkeeper
Fidelity Investments Institutional
Plan year
Jan 1, 2024 – Dec 31, 2024
Plan established
May 1, 2003
✓ Employer contributions— Automatic enrollment✓ Default investment for undecided participants✓ Participants choose their own investments— Self-directed brokerage window✓ Profit sharing— Company stock (ESOP)

Source: Form 5500 for plan year 2024 (Jan 1, 2024 – Dec 31, 2024), filed Sep 23, 2025. Public filing with the U.S. Department of Labor.

Money in and out in plan year 2024

  • $16.2 million went into the plan in contributions, $2.95 million of it from the employer (18%).
  • $7.38 million was paid out to participants.
  • Investment and other income added $18.7 million.

How the Meso Scale Diagnostics, Llc 401(k) changed, 2019–2024

Plan yearParticipantsPlan assetsEmployer contributionsBenefits paid
2019758$71.4 million$734,449$4.46 million
2020823$85.5 million$778,781$5.45 million
2021855$103.2 million$1.09 million$3.90 million
2022934$89.9 million$1.93 million$4.53 million
20231,109$121.2 million$2.70 million$3.25 million
20241,205$148.5 million$2.95 million$7.38 million

Meso Scale Diagnostics, Llc 401(k) Contact Information

Phone
240-314-2670
Mailing address
1601 RESEARCH BLVD, ROCKVILLE MD 20850
Plan sponsor
MESO SCALE DIAGNOSTICS, LLC
Employer identification number (EIN)
52-1974952
Plan number
001

Questions about the Meso Scale Diagnostics, Llc 401(k)

Does Meso Scale Diagnostics, Llc contribute to the 401(k)?

Yes. The plan reports an employer contribution arrangement. In plan year 2024 the employer contributed $2.95 million, 18% of all contributions.

Does the Meso Scale Diagnostics, Llc 401(k) have automatic enrollment?

No. The plan does not report automatic enrollment; employees enroll themselves.

How many people are in the Meso Scale Diagnostics, Llc 401(k) plan?

1,205 participants at the start of plan year 2024, 1,044 of them active employees, and 310 former employees who still had money in the plan.

What is the average 401(k) balance at Meso Scale Diagnostics, Llc?

About $112,074 per account: $148.5 million in plan assets across 1,325 accounts with a balance at the end of plan year 2024.

Who manages the Meso Scale Diagnostics, Llc 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 Meso Scale Diagnostics, Llc. 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.

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