401(k) · DOL Form 5500 · 2023

Merrimack Pharmaceuticals, Inc. 401(k) Plan

Data updated 2026-08-25

$14M
Total assets Small plan by assets
21
Participants Small participant base
66th
Percentile by assets National rank
$688,318
Avg per participant High balance/head
PlainRetire home → About this data RSS: change history

Official DOL plan name: Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan · Sponsored by Merrimack Pharmaceuticals, Inc. · Massachusetts · Manufacturing

$14M in assets, 21 participants

Merrimack Pharmaceuticals, Inc.'s Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan reported $14M in total assets and 21 participants in its 2023 DOL Form 5500 filing, ranking in the 66th percentile by assets among filed plans. Figures are as reported by the plan sponsor to the Department of Labor, not audited or endorsed by PlainRetire.

  • #10,243 in Manufacturing (18,722 peers)

Merrimack Pharmaceuticals, Inc. multi-year trail

Merrimack Pharmaceuticals, Inc.'s plans moved -96.5% in assets from 2022 to 2024; this filing shows Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan at $14M / 21 participants.

#10,243
in Manufacturing (18,722 peers)
+9.5%
assets growth YoY

Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan's mid-pack asset rank among Manufacturing and all filers

Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan vs every filed plan by assets

End-of-year total assets · plan year 2023 · DOL Form 5500

$14,454,687 Top 34% higher than 66% of 127,068 filed plans

This plan $0 $2,050,000,000 every filed plan with reported assets, bucketed by value

Dashed line + filled bar = this entry, among filed plans.

Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2023

Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan among smaller filed plans by headcount

Plan-year 2023 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan is a small filing (21 participants) on this national headcount ladder.

What changed between DOL Form 5500 filings

plan year 2022 → plan year 2023

  • Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan reported net income rose from -$5M in the plan year 2022 filing to $1M in the plan year 2023 filing.
  • Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan end-of-year assets rose from $13M in the plan year 2022 filing to $14M in the plan year 2023 filing.

See the national 2022→2023 release diff →

EBSA filing schedule strip

Filing strip 043210530 · Merrimack Pharmaceuticals, Inc. PY 2023 · 401(k)

Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan · $14M · 21 · 66th

  • IND $14M
  • EOY 21
  • 5500 66th
  • ASSETS 401(k)
  • PCT near Nextcare, Inc. 401(k) Plan
  • EIN ind #10243

Stamps derive from this plan's Form 5500 line items (assets, participants, type, EIN, cohort placement) - not a quality rating of the sponsor. Read with Manufacturing retirement plans → · Plans in Massachusetts →

Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan in the asset neighbourhood

Miac Analytics 401(k) Plan$14MMerrimack Pharmaceuticals, Inc. 401(k) Retirement PlanMerrimack Pharmaceuticals, I…$14MNextcare, Inc. 401(k) Plan$14MGeater Machining & Manufacturing Co., Inc. Retirement Savings PlanGeater Machining & Manufactu…$14MPeace River Center for Personal Development, Inc. 401(k) PlanPeace River Center for Perso…$14M
End-of-year total assets ($M) among Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

Merrimack Pharmaceuticals, Inc. multi-year asset trail

Sponsor-wide plan assets over time

All Merrimack Pharmaceuticals, Inc. plans reported in each filing year

Latest sponsor-wide plan assets
$465K 96.48195694292414% vs 2022
2024 filing year
$0M$5M$10M$15M$20M 202220232024 $13.2M $0.46M ▼ -96.5%
Year Plans Participants Total Assets
2022 1 21 $13M
2023 1 21 $14M
2024 2 N/A $465K

Merrimack Pharmaceuticals, Inc. filing trail (2023)

Total Assets (Beginning of Year)$13M
Net Assets (End of Year)$14M
Net Income$1M
Employer EIN043210530
Plan Effective Date2002-01-01
Filing StatusFILING RECEIVED

Nearby 401(k) Plans in Massachusetts

Peer 401(k) plans, same state, same plan type, ranked by total assets.

Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants Scatter plot of 6 data points. -20000020000400006000080000 -10010203040 Total assets ($B) Participants Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan, Total assets ($B): 0.014454687 · Participants: 21Merrimack Pharmaceuticals, Inc. 401(k) Retirement PlanFidelity Retirement Savings Plan, Total assets ($B): 28.649852331 · Participants: 62289Fidelity Retirement Savings PlanLiberty Mutual 401(k) Plan, Total assets ($B): 10.556596852 · Participants: 37052Liberty Mutual 401(k) PlanMassachusetts Institute of Technology Supplemental 401(k) Plan, Total assets ($B): 6.829912863 · Participants: 14094Massachusetts Institute of Technology Supplemental 401(k) PlanBoston Scientific Corporation 401(k) Retirement Savings Plan, Total assets ($B): 5.786107181 · Participants: 19881Boston Scientific Corporation 401(k) Retirement Savings PlanPhilips North America 401(k) Plan, Total assets ($B): 5.779286156 · Participants: 19120Philips North America 401(k) Plan
Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan side-by-side with 3 peers →

Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan's out-of-state 401(k) peers by assets and headcount

Outside Massachusetts, the nearest 401(k) by assets is Nextcare, Inc. 401(k) Plan in AZ ($14M); by covered participants it is Pulmonary & Sleep Medicine Associates 401(k) Profit Sharing Plan in GA (21 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (21 participants); asset peers above are excluded.

DOL Form 5500 plan year 2023. Asset totals can differ widely at the same headcount; neither axis is a quality rating.

Frequently Asked Questions

How did Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan assets move in 2023? ▼
Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan grew at a solid clip - up 9.5% during 2023, from $13M to $14M. Reported net income was $1M.
How have Merrimack Pharmaceuticals, Inc. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Merrimack Pharmaceuticals, Inc.'s sponsor-wide assets declined 96.5%, from $13M to $465K.
Which 401(k) plans are similar in size to Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan? ▼
Among 401(k) plans in other states, the closest by assets is Nextcare, Inc. 401(k) Plan in AZ ($14M, 1,488 participants).
Which 401(k) plans cover a similar participant headcount to Merrimack Pharmaceuticals, Inc. 401(k) Retirement Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Pulmonary & Sleep Medicine Associates 401(k) Profit Sharing Plan in GA (21 participants, $10M in assets).

Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2023.

Source: DOL EFAST2 filing system (efast.dol.gov) - original filing retrieval by EIN 043210530.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from U.S. Department of Labor Form 5500 filings (EBSA). See our methodology for details.