401(k) · DOL Form 5500 · 2023

2seventy Bio, Inc. 401(k) Plan

Data updated 2026-08-25

$44M
Total assets Below avg plan size
413
Participants Below avg headcount
84th
Percentile by assets National rank
$107,588
Avg per participant Below avg balance/head
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Official DOL plan name: 2seventy Bio, Inc. 401(k) Plan · Sponsored by 2seventy Bio, Inc. · Massachusetts · Professional & Technical Services

$44M in assets, 413 participants

2seventy Bio, Inc.'s 2seventy Bio, Inc. 401(k) Plan reported $44M in total assets and 413 participants in its 2023 DOL Form 5500 filing, ranking in the 84th 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.

  • #17,327 in Professional & Technical Services (20,321 peers)

Where 2seventy Bio, Inc. 401(k) Plan sits by assets

2seventy Bio, Inc. 401(k) Plan sits in the top quartile of all filed plans by assets, $44M for 413 participants (~$107,588/participant), up 46.8% in 2023.

#17,327
in Professional & Technical Services (20,321 peers)
+46.8%
assets growth YoY
0.4×
vs typical plan assets (national mean)

2seventy Bio, Inc. 401(k) Plan's outsized position by total assets

2seventy Bio, Inc. 401(k) Plan vs every filed plan by assets

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

$44,433,833 Top 16% higher than 84% 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

2seventy Bio, Inc. 401(k) 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. 2seventy Bio, Inc. 401(k) Plan sits mid-pack in the medium band (413 participants).

What changed between DOL Form 5500 filings

plan year 2022 → plan year 2023

  • 2seventy Bio, Inc. 401(k) Plan reported net income rose from $959K in the plan year 2022 filing to $14M in the plan year 2023 filing.
  • 2seventy Bio, Inc. 401(k) Plan end-of-year assets rose from $30M in the plan year 2022 filing to $44M in the plan year 2023 filing.

See the national 2022→2023 release diff →

DOL schedule card

Filing strip 863658454 · 2seventy Bio, Inc. PY 2023 · 401(k)

2seventy Bio, Inc. 401(k) Plan · $44M · 413 · 84th

  • PART $44M
  • PART 413
  • PART 84th
  • PART 401(k)
  • PART near Crown Battery Manufacturing Company 401(k) Profit Sharing Plan
  • PART ind #17327

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 →

2seventy Bio, Inc. 401(k) Plan in the asset neighbourhood

Leonardo Electronics US Inc. 401(k) PlanLeonardo Electronics US Inc.…$44M2seventy Bio, Inc. 401(k) Plan2seventy Bio, Inc. 401(k) Pl…$44MCrown Battery Manufacturing Company 401(k) Profit Sharing PlanCrown Battery Manufacturing …$44MFortis Construction, Inc. Employees Savings TrustFortis Construction, Inc. Em…$44MTeksynap Corporation 401(k) PlanTeksynap Corporation 401(k) …$44M
End-of-year total assets ($M) among 2seventy Bio, Inc. 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

Scale-class filing particulars (2023)

Total Assets (Beginning of Year)$30M
Net Assets (End of Year)$44M
Net Income$14M
Employer EIN863658454
Plan Effective Date2021-11-01
Filing StatusFILING RECEIVED

Sponsor Plan History (2seventy Bio, Inc.)

Sponsor-wide plan assets over time

All 2seventy Bio, Inc. plans reported in each filing year

Latest sponsor-wide plan assets
$32M 6.733421122832562% vs 2022
2024 filing year
$25M$30M$35M$40M$45M$50M 202220232024 $30.3M $32.3M ▲ +6.7%
Year Plans Participants Total Assets
2022 1 416 $30M
2023 1 413 $44M
2024 1 276 $32M

Nearby 401(k) Plans in Massachusetts

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

2seventy Bio, Inc. 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants Scatter plot of 6 data points. -20000020000400006000080000 -10010203040 Total assets ($B) Participants 2seventy Bio, Inc. 401(k) Plan, Total assets ($B): 0.044433833 · Participants: 4132seventy Bio, Inc. 401(k) 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
2seventy Bio, Inc. 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare 2seventy Bio, Inc. 401(k) Plan side-by-side with 3 peers →

2seventy Bio, Inc. 401(k) Plan's out-of-state 401(k) peers by assets and headcount

Outside Massachusetts, the nearest 401(k) by assets is Crown Battery Manufacturing Company 401(k) Profit Sharing Plan in OH ($44M); by covered participants it is Menholt Automotive Group 401(k) Plan in MT (413 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (413 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 2seventy Bio, Inc. 401(k) Plan assets move in 2023? ▼
2seventy Bio, Inc. 401(k) Plan surged - up 46.8% during 2023, from $30M to $44M. Reported net income was $14M.
How have 2seventy Bio, Inc. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), 2seventy Bio, Inc.'s sponsor-wide assets grew 6.7%, from $30M to $32M.
Where does 2seventy Bio, Inc. 401(k) Plan rank by assets among Form 5500 filers? ▼
2seventy Bio, Inc. 401(k) Plan ranks in the 84th percentile by end-of-year assets among 127,072 plans that reported assets for plan year 2023 (in the top quartile of all filed plans by assets).
Which 401(k) plans are similar in size to 2seventy Bio, Inc. 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is Crown Battery Manufacturing Company 401(k) Profit Sharing Plan in OH ($44M, 528 participants).
Which 401(k) plans cover a similar participant headcount to 2seventy Bio, Inc. 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Menholt Automotive Group 401(k) Plan in MT (413 participants, $17M 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 863658454.

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.