401(k) · DOL Form 5500 · 2023

Prime Medicine, Inc. 401(k) Plan

Data updated 2026-08-25

$10M
Total assets Small plan by assets
175
Participants Small participant base
58th
Percentile by assets National rank
$55,171
Avg per participant Low 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

$10M in assets, 175 participants

Prime Medicine, Inc.'s Prime Medicine, Inc. 401(k) Retirement Plan reported $10M in total assets and 175 participants in its 2023 DOL Form 5500 filing, ranking in the 58th 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.

  • #11,442 in Professional & Technical Services (20,321 peers)

Coverage in Massachusetts

Prime Medicine, Inc. 401(k) Retirement Plan covers 175 participants in Massachusetts, about 27% of the average Massachusetts filer (state average ~659 per filing). Assets: $10M.

#11,442
in Professional & Technical Services (20,321 peers)
+168.1%
assets growth YoY

Prime Medicine, Inc. 401(k) Retirement Plan's mid-pack asset rank among Professional & Technical Services and all filers

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

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

$9,654,934 Top 42% higher than 58% 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

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

Plan-year 2023 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 (175 participants).

Form 5500 schedule snapshot

Filing strip 843097762 · Prime Medicine, Inc. PY 2023 · 401(k)

Prime Medicine, Inc. 401(k) Retirement Plan · $10M · 175 · 58th

  • ASSETS $10M
  • PCT 175
  • EIN 58th
  • RANK 401(k)
  • PHOTO near Community State Bank of Galva 401(k) & Employee Stock Ownership Plan
  • IND ind #11442

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

Community State Bank of Galva 401(k) & Employee Stock Ownership PlanCommunity State Bank of Galv…$10MAFL-CIO Appalachian Council Collectively Bargained 401(k) PlanAFL-CIO Appalachian Council …$10MViscosity Oil 401(k) Plan$10MPrime Medicine, Inc. 401(k) Retirement PlanPrime Medicine, Inc. 401(k) …$10MPruett's Food 401(k) Plan$10M
End-of-year total assets ($M) among Prime Medicine, Inc. 401(k) Retirement Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

Massachusetts filing particulars

Total Assets (Beginning of Year)$4M
Net Assets (End of Year)$10M
Net Income$6M
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): 0.009654934 · Participants: 175Prime Medicine, 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
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 Community State Bank of Galva 401(k) & Employee Stock Ownership Plan in IL ($10M); by covered participants it is Uniseal 401(k) Plan in IN (175 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (175 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 Prime Medicine, Inc. 401(k) Retirement Plan assets move in 2023? ▼
Prime Medicine, Inc. 401(k) Retirement Plan surged - up 168.1% during 2023, from $4M to $10M. Reported net income was $6M.
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 Community State Bank of Galva 401(k) & Employee Stock Ownership Plan in IL ($10M, 43 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 Uniseal 401(k) Plan in IN (175 participants, N/A 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 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.