Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan
ERISA Form 5500 plan record drawn from DOL EBSA — verify with linked source filings below.
Sponsored by Merrimack Pharmaceuticals, Inc. · Massachusetts · Manufacturing
What the 2023 filing shows
Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan holds $13M for 21 participants - about $628,833 per participant, down 25.7% over the 2022 plan year.
- $13M
- total plan assets (2022 EOY)
- 21
- covered participants
- $628,833
- avg assets per participant
- -25.7%
- assets change YoY
The plan reported a net loss of $5M for the year — a single-year figure driven by markets and benefit payments, not a measure of plan health.
What the Filing Says About Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan
Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan is a 401(k) retirement plan sponsored by Merrimack Pharmaceuticals, Inc., headquartered in Massachusetts. As of the 2022 Form 5500 filing, the plan reports $13M in total end-of-year assets and covers 21 participants across the Manufacturing industry. The sponsor's EIN on file with the U.S. Department of Labor is 043210530, and the plan has been effective since 2002-01-01. Its filing status is currently FILING RECEIVED.
Year over year, total assets moved from $18M at the beginning of 2022 to $13M at year-end — a decline of 25.7%. Net assets (after liabilities) closed the year at $13M, with reported net income of $-4,572,819 driven by investment returns, contributions received, and benefit payments during the period. These figures reflect what the plan administrator certified on Schedule H or Schedule I of the Form 5500 annual return and can be compared against 2 prior plan-year filings from the same sponsor shown below.
Asset totals and participant counts reflect a single plan year snapshot and can change materially with market conditions, plan mergers, or workforce changes. Fields such as "net income" include both realized investment performance and contribution/distribution flows — a single-year figure does not by itself indicate plan health or participant outcomes. This page summarizes public DOL disclosures for research and educational purposes only and is not retirement, tax, legal, or financial advice. Before making decisions about your own retirement benefits or evaluating an employer's plan, verify the underlying filing directly via the DOL EFAST2 system and consult a qualified professional.
Financial Summary (2023)
| Total Assets (Beginning of Year) | $18M |
| Total Assets (End of Year) | $13M |
| Net Assets (End of Year) | $13M |
| Net Income | $-4,572,819 |
| Plan Type | 401(k) |
| Employer EIN | 043210530 |
| Plan Effective Date | 2002-01-01 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (Merrimack Pharmaceuticals, Inc.)
| Year | Plans | Participants | Total Assets |
|---|---|---|---|
| 2022 | 1 | 21 | $13M |
| 2023 | 1 | 21 | $14M |
| 2024 | 2 | N/A | $465K |
Nearby 401(k) Plans in Massachusetts
Peer 401(k) plans — same state, same plan type — ranked by total assets.
- Fidelity Retirement Savings Plan $28.6B · 62,289
- Consolidated 403(b) Program of Mass General Brigham and Member Organizations $14.9B · 74,212
- Liberty Mutual 401(k) Plan $10.6B · 37,052
- Massachusetts Institute of Technology Supplemental 401(k) Plan $6.8B · 14,094
- Boston Scientific Corporation 401(k) Retirement Savings Plan $5.8B · 19,881
Related Data
Guides
Frequently Asked Questions
How much money is in the Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan? ▼
What type of plan is Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan? ▼
Who sponsors the Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan? ▼
How did Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan perform in 2022? ▼
Where can I find official filings for Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan? ▼
How does Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan compare to other plans? ▼
Explore PlainRetire
Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2022.
Source: DOL EFAST2 filing system (efast.dol.gov) — original filing retrieval by EIN 043210530.
Reference: IRS Publication 560 — Retirement Plans for Small Business, contribution-limit rules.
Reference: IRS Publication 590-B — Distributions from IRAs, RMD rules under SECURE Act 2.0.
Read our methodology — how this data is sourced, computed, and verified.