401(k) · DOL Form 5500 · 2024

Prime Medicine, Inc. 401(k) Plan

Data updated 2026-08-25

$17M
Total assets Small plan by assets
239
Participants Below avg headcount
67th
Percentile by assets National rank
$69,473
Avg per participant Below avg balance/head
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Official DOL plan name: Prime Medicine, Inc. 401(k) Retirement Plan · Sponsored by Prime Medicine, Inc. · Massachusetts · Professional & Technical Services

$17M in assets, 239 participants

Prime Medicine, Inc.'s Prime Medicine, Inc. 401(k) Retirement Plan reported $17M in total assets and 239 participants in its 2024 DOL Form 5500 filing, ranking in the 67th 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.

  • #13,243 in Professional & Technical Services (20,173 peers)

Coverage in Massachusetts

Prime Medicine, Inc. 401(k) Retirement Plan covers 239 participants in Massachusetts, about 36% of the average Massachusetts filer (state average ~659 per filing). Assets: $17M.

#13,243
in Professional & Technical Services (20,173 peers)
+72.0%
assets growth YoY

Prime Medicine, Inc. 401(k) Retirement Plan's outsized position by total assets

Prime Medicine, Inc. 401(k) Retirement Plan vs every filed plan by assets

End-of-year total assets · plan year 2024 · DOL Form 5500

$16,604,024 Top 33% higher than 67% of 123,620 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 2024

Prime Medicine, Inc. 401(k) Retirement Plan among mid-size filed plans by headcount

Plan-year 2024 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Prime Medicine, Inc. 401(k) Retirement Plan sits mid-pack in the medium band (239 participants).

What changed between DOL Form 5500 filings

plan year 2023 → plan year 2024

  • Prime Medicine, Inc. 401(k) Retirement Plan end-of-year assets rose from $10M in the plan year 2023 filing to $17M in the plan year 2024 filing.
  • Prime Medicine, Inc. 401(k) Retirement Plan reported participants rose from 175 in the plan year 2023 filing to 239 in the plan year 2024 filing.
  • Prime Medicine, Inc. 401(k) Retirement Plan reported net income rose from $6M in the plan year 2023 filing to $7M in the plan year 2024 filing.

See the national 2023→2024 release diff →

Published 5500 schedule card

Filing strip 843097762 · Prime Medicine, Inc. PY 2024 · 401(k)

Prime Medicine, Inc. 401(k) Retirement Plan · $17M · 239 · 67th

  • PHOTO $17M
  • IND 239
  • EOY 67th
  • 5500 401(k)
  • ASSETS near Sparkcognition 401(k) Plan
  • PCT ind #13243

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 Professional & Technical Services retirement plans → · Plans in Massachusetts →

Prime Medicine, Inc. 401(k) Retirement Plan in the asset neighbourhood

Prime Medicine, Inc. 401(k) Retirement PlanPrime Medicine, Inc. 401(k) …$17MSparkcognition 401(k) Plan$17MBob Brown Chevrolet, Inc. Profit Sharing PlanBob Brown Chevrolet, Inc. Pr…$17MCrane Credit Union Employees' Thrift PlanCrane Credit Union Employees…$17MIngenio, LLC 401(k) Plan$17M
End-of-year total assets ($M) among Prime Medicine, Inc. 401(k) Retirement Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2024.

Massachusetts filing particulars

Total Assets (Beginning of Year)$10M
Net Assets (End of Year)$17M
Net Income$7M
Employer EIN843097762
Plan Effective Date2020-06-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Prime Medicine, Inc.)

Sponsor-wide plan assets over time

All Prime Medicine, Inc. plans reported in each filing year

Latest sponsor-wide plan assets
$17M 71.97449511306861% vs 2023
2024 filing year
$5M$10M$15M$20M 20232024 $9.65M $16.6M ▲ +72.0%
Year Plans Participants Total Assets
2023 1 175 $10M
2024 1 239 $17M

Nearby 401(k) Plans in Massachusetts

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

Prime Medicine, 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 ($B) Participants Prime Medicine, Inc. 401(k) Retirement Plan, Total assets ($B): 0.016604024 · Participants: 239Prime Medicine, Inc. 401(k) Retirement PlanFidelity Retirement Savings Plan, Total assets ($B): 34.201609937 · Participants: 66907Fidelity Retirement Savings PlanLiberty Mutual 401(k) Plan, Total assets ($B): 11.352606499 · Participants: 34618Liberty Mutual 401(k) PlanMassachusetts Institute of Technology Supplemental 401(k) Plan, Total assets ($B): 7.720373045 · Participants: 14762Massachusetts Institute of Technology Supplemental 401(k) PlanBoston Scientific Corporation 401(k) Retirement Savings Plan, Total assets ($B): 6.775289067 · Participants: 20639Boston Scientific Corporation 401(k) Retirement Savings PlanState Street Salary Savings Program, Total assets ($B): 6.532301643 · Participants: 12777State Street Salary Savings Program
Prime Medicine, Inc. 401(k) Retirement Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare Prime Medicine, Inc. 401(k) Retirement Plan side-by-side with 3 peers →

Prime Medicine, 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 Sparkcognition 401(k) Plan in TX ($17M); by covered participants it is Timber Automation, LLC 401(k) Plan in AR (239 participants). Same-state nearby plans are listed separately above.

Closest by plan assets

Nearest other-state filings by tot_assets_eoy ($17M here).

Similar participant headcount

Nearest other-state filings by covered participants (239 participants); asset peers above are excluded.

DOL Form 5500 plan year 2024. Asset totals can differ widely at the same headcount; neither axis is a quality rating.

Frequently Asked Questions

How did Prime Medicine, Inc. 401(k) Retirement Plan assets move in 2024? ▼
Prime Medicine, Inc. 401(k) Retirement Plan surged - up 72.0% during 2024, from $10M to $17M. Reported net income was $7M.
How have Prime Medicine, Inc. plan assets changed over time? ▼
Across 2 plan years on file (2023-2024), Prime Medicine, Inc.'s sponsor-wide assets grew 72.0%, from $10M to $17M.
Which 401(k) plans are similar in size to Prime Medicine, Inc. 401(k) Retirement Plan? ▼
Among 401(k) plans in other states, the closest by assets is Sparkcognition 401(k) Plan in TX ($17M, 187 participants).
Which 401(k) plans cover a similar participant headcount to Prime Medicine, Inc. 401(k) Retirement Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Timber Automation, LLC 401(k) Plan in AR (239 participants, N/A in assets).

Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2024.

Source: DOL EFAST2 filing system (efast.dol.gov) - original filing retrieval by EIN 843097762.

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.