401(k) · DOL Form 5500 · 2023

Sutro Biopharma, Inc. 401(k) Plan

Data updated 2026-08-25

$31M
Total assets Below avg plan size
288
Participants Below avg headcount
80th
Percentile by assets National rank
$109,277
Avg per participant Below avg balance/head
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Official DOL plan name: Sutro Biopharma, Inc. 401(k) Plan · Sponsored by Sutro Biopharma, Inc. · California · Professional & Technical Services

$31M in assets, 288 participants

Sutro Biopharma, Inc.'s Sutro Biopharma, Inc. 401(k) Plan reported $31M in total assets and 288 participants in its 2023 DOL Form 5500 filing, ranking in the 80th 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.

  • #16,348 in Professional & Technical Services (20,321 peers)

Coverage in California

Sutro Biopharma, Inc. 401(k) Plan covers 288 participants in California, about 46% of the average California filer (state average ~630 per filing). Assets: $31M.

#16,348
in Professional & Technical Services (20,321 peers)
+52.7%
assets growth YoY
0.3×
vs typical plan assets (national mean)

Sutro Biopharma, Inc. 401(k) Plan's outsized position by total assets

Sutro Biopharma, Inc. 401(k) Plan vs every filed plan by assets

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

$31,471,842 Top 20% higher than 80% 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

Sutro Biopharma, 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. Sutro Biopharma, Inc. 401(k) Plan sits mid-pack in the medium band (288 participants).

What changed between DOL Form 5500 filings

plan year 2022 → plan year 2023

  • Sutro Biopharma, Inc. 401(k) Plan reported net income rose from -$845K in the plan year 2022 filing to $11M in the plan year 2023 filing.
  • Sutro Biopharma, Inc. 401(k) Plan end-of-year assets rose from $21M in the plan year 2022 filing to $31M in the plan year 2023 filing.
  • Sutro Biopharma, Inc. 401(k) Plan reported participants rose from 239 in the plan year 2022 filing to 288 in the plan year 2023 filing.

See the national 2022→2023 release diff →

Form 5500 schedule snapshot

Filing strip 470926186 · Sutro Biopharma, Inc. PY 2023 · 401(k)

Sutro Biopharma, Inc. 401(k) Plan · $31M · 288 · 80th

  • EOY $31M
  • EOY 288
  • EOY 80th
  • EOY 401(k)
  • EOY near The Melling Employees' 401(k) Plan
  • EOY ind #16348

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 California →

Sutro Biopharma, Inc. 401(k) Plan in the asset neighbourhood

Carlson Capital, L.P. 401(k) PlanCarlson Capital, L.P. 401(k)…$31MMeb General Contractors, Inc. 401(k) Profit Sharing PlanMeb General Contractors, Inc…$31MSutro Biopharma, Inc. 401(k) PlanSutro Biopharma, Inc. 401(k)…$31MThe Melling Employees' 401(k) PlanThe Melling Employees' 401(k…$31MGerald Auto Group 401(k) Plan & TrustGerald Auto Group 401(k) Pla…$31M
End-of-year total assets ($M) among Sutro Biopharma, Inc. 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

California filing particulars

Total Assets (Beginning of Year)$21M
Net Assets (End of Year)$31M
Net Income$11M
Employer EIN470926186
Plan Effective Date2008-04-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Sutro Biopharma, Inc.)

Sponsor-wide plan assets over time

All Sutro Biopharma, Inc. plans reported in each filing year

Latest sponsor-wide plan assets
$44M 112.99070730083815% vs 2022
2024 filing year
$10M$20M$30M$40M$50M 202220232024 $20.6M $43.9M ▲ +113.0%
Year Plans Participants Total Assets
2022 1 239 $21M
2023 1 288 $31M
2024 1 324 $44M

Nearby 401(k) Plans in California

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

Sutro Biopharma, Inc. 401(k) Plan vs. nearby 401(k) plans in California, assets vs. participants Scatter plot of 6 data points. -50000050000100000150000200000250000 -200204060 Total assets ($B) Participants Sutro Biopharma, Inc. 401(k) Plan, Total assets ($B): 0.031471842 · Participants: 288Sutro Biopharma, Inc. 401(k) PlanWells Fargo & Company 401(k) Plan, Total assets ($B): 51.831350351 · Participants: 193919Wells Fargo & Company 401(k) PlanGoogle LLC 401(k) Savings Plan, Total assets ($B): 39.047152408 · Participants: 122867Google LLC 401(k) Savings PlanOracle Corporation 401(k) Savings and Investment Plan, Total assets ($B): 26.320437734 · Participants: 63105Oracle Corporation 401(k) Savings and Investment PlanIntel 401(k) Savings Plan, Total assets ($B): 22.17918189 · Participants: 59863Intel 401(k) Savings PlanApple 401(k) Plan, Total assets ($B): 19.779511539 · Participants: 106111Apple 401(k) Plan
Sutro Biopharma, Inc. 401(k) Plan vs. nearby 401(k) plans in California, assets vs. participants
Compare Sutro Biopharma, Inc. 401(k) Plan side-by-side with 3 peers →

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

Outside California, the nearest 401(k) by assets is The Melling Employees' 401(k) Plan in MI ($31M); by covered participants it is Accord Health Service, Inc. 401(k) Plan in PA (288 participants). Same-state nearby plans are listed separately above.

Closest by plan assets

Nearest other-state filings by tot_assets_eoy ($31M here).

Similar participant headcount

Nearest other-state filings by covered participants (288 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 Sutro Biopharma, Inc. 401(k) Plan assets move in 2023? ▼
Sutro Biopharma, Inc. 401(k) Plan surged - up 52.7% during 2023, from $21M to $31M. Reported net income was $11M.
How have Sutro Biopharma, Inc. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Sutro Biopharma, Inc.'s sponsor-wide assets grew 113.0%, from $21M to $44M.
Where does Sutro Biopharma, Inc. 401(k) Plan rank by assets among Form 5500 filers? ▼
Sutro Biopharma, Inc. 401(k) Plan ranks in the 80th 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 Sutro Biopharma, Inc. 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is The Melling Employees' 401(k) Plan in MI ($31M, 526 participants).
Which 401(k) plans cover a similar participant headcount to Sutro Biopharma, Inc. 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Accord Health Service, Inc. 401(k) Plan in PA (288 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 470926186.

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.