401(k) · DOL Form 5500 · 2024

Seres Therapeutics, Inc. 401(k) Plan

Data updated 2026-08-25

$39M
Total assets Below avg plan size
244
Participants Below avg headcount
81st
Percentile by assets National rank
$160,198
Avg per participant Above avg balance/head
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Official DOL plan name: Seres Therapeutics, Inc. 401(k) Plan · Sponsored by Seres Therapeutics, Inc. · Massachusetts · Information & Media

$39M in assets, 244 participants

Seres Therapeutics, Inc.'s Seres Therapeutics, Inc. 401(k) Plan reported $39M in total assets and 244 participants in its 2024 DOL Form 5500 filing, ranking in the 81st 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.

  • #2,091 in Information & Media (2,822 peers)

Coverage in Massachusetts

Seres Therapeutics, Inc. 401(k) Plan covers 244 participants in Massachusetts, about 37% of the average Massachusetts filer (state average ~659 per filing). Assets: $39M.

#2,091
in Information & Media (2,822 peers)
-0.6%
assets change YoY
0.4×
vs typical plan assets (national mean)

The plan reported a net loss of $233K for the year, a single-year figure driven by markets and benefit payments, not a measure of plan health.

Seres Therapeutics, Inc. 401(k) Plan's outsized position by total assets

Seres Therapeutics, Inc. 401(k) Plan vs every filed plan by assets

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

$39,088,195 Top 19% higher than 81% 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

Seres Therapeutics, Inc. 401(k) 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. Seres Therapeutics, Inc. 401(k) Plan sits mid-pack in the medium band (244 participants).

What changed between DOL Form 5500 filings

plan year 2023 → plan year 2024

  • Seres Therapeutics, Inc. 401(k) Plan reported net income fell from $13M in the plan year 2023 filing to -$233K in the plan year 2024 filing.
  • Seres Therapeutics, Inc. 401(k) Plan reported participants fell from 419 in the plan year 2023 filing to 244 in the plan year 2024 filing.
  • Seres Therapeutics, Inc. 401(k) Plan end-of-year assets fell from $39M in the plan year 2023 filing to $39M in the plan year 2024 filing.

See the national 2023→2024 release diff →

Plan-year Form 5500 strip

Filing strip 274326290 · Seres Therapeutics, Inc. PY 2024 · 401(k)

Seres Therapeutics, Inc. 401(k) Plan · $39M · 244 · 81st

  • RANK $39M
  • PHOTO 244
  • IND 81st
  • EOY 401(k)
  • 5500 near Reliant Pro Rehab, LLC Retirement Plan
  • ASSETS ind #2091

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 Information & Media retirement plans → · Plans in Massachusetts →

Seres Therapeutics, Inc. 401(k) Plan in the asset neighbourhood

Seres Therapeutics, Inc. 401(k) PlanSeres Therapeutics, Inc. 401…$39MReliant Pro Rehab, LLC Retirement PlanReliant Pro Rehab, LLC Retir…$39MUnited Sugar Producers and Refiners Cooperative 401(k) Partnership PlanUnited Sugar Producers and R…$39MFirst Community Credit Union 401(k) Retirement PlanFirst Community Credit Union…$39MAlfred Williams & Company 401(k) PlanAlfred Williams & Company 40…$39M
End-of-year total assets ($M) among Seres Therapeutics, Inc. 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2024.

Massachusetts filing particulars

Total Assets (Beginning of Year)$39M
Net Assets (End of Year)$39M
Net Income-$233K
Employer EIN274326290
Plan Effective Date2013-01-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Seres Therapeutics, Inc.)

Sponsor-wide plan assets over time

All Seres Therapeutics, Inc. plans reported in each filing year

Latest sponsor-wide plan assets
$39M 46.620542392773196% vs 2022
2024 filing year
$25M$30M$35M$40M$45M 202220232024 $26.7M $39.1M ▲ +46.6%
Year Plans Participants Total Assets
2022 1 332 $27M
2023 1 419 $39M
2024 1 244 $39M

Nearby 401(k) Plans in Massachusetts

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

Seres Therapeutics, Inc. 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants Scatter plot of 6 data points. -20000020000400006000080000 -10010203040 Total assets ($B) Participants Seres Therapeutics, Inc. 401(k) Plan, Total assets ($B): 0.039088195 · Participants: 244Seres Therapeutics, Inc. 401(k) 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
Seres Therapeutics, Inc. 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare Seres Therapeutics, Inc. 401(k) Plan side-by-side with 3 peers →

Seres Therapeutics, Inc. 401(k) Plan's out-of-state 401(k) peers by assets and headcount

Outside Massachusetts, the nearest 401(k) by assets is Reliant Pro Rehab, LLC Retirement Plan in TX ($39M); by covered participants it is Cansortium Holdings 401(k) Plan in FL (244 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (244 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 Seres Therapeutics, Inc. 401(k) Plan assets move in 2024? ▼
Seres Therapeutics, Inc. 401(k) Plan held essentially flat - down 0.6% during 2024, from $39M to $39M. Reported net income was -$233K.
How have Seres Therapeutics, Inc. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Seres Therapeutics, Inc.'s sponsor-wide assets grew 46.6%, from $27M to $39M.
Where does Seres Therapeutics, Inc. 401(k) Plan rank by assets among Form 5500 filers? ▼
Seres Therapeutics, Inc. 401(k) Plan ranks in the 81st percentile by end-of-year assets among 123,622 plans that reported assets for plan year 2024 (in the top quartile of all filed plans by assets).
Which 401(k) plans are similar in size to Seres Therapeutics, Inc. 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is Reliant Pro Rehab, LLC Retirement Plan in TX ($39M, 8,147 participants).
Which 401(k) plans cover a similar participant headcount to Seres Therapeutics, Inc. 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Cansortium Holdings 401(k) Plan in FL (244 participants, $165K 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 274326290.

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.