401(k) · DOL Form 5500 · 2022

Prothena Biosciences Inc 401(k) Plan

Data updated 2026-08-25

$26M
Total assets Below avg plan size
77
Participants Small participant base
81st
Percentile by assets National rank
$333,968
Avg per participant High balance/head
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Official DOL plan name: Prothena Biosciences Inc 401(k) Plan · Sponsored by Prothena Biosciences Inc · California · Professional & Technical Services

$26M in assets, 77 participants

Prothena Biosciences Inc's Prothena Biosciences Inc 401(k) Plan reported $26M in total assets and 77 participants in its 2022 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.

  • #17,556 in Professional & Technical Services (21,562 peers)

Where Prothena Biosciences Inc 401(k) Plan sits by assets

Prothena Biosciences Inc 401(k) Plan sits in the top quartile of all filed plans by assets, $26M for 77 participants (~$333,968/participant), down 10.0% in 2022.

#17,556
in Professional & Technical Services (21,562 peers)
-10.0%
assets change YoY
0.3×
vs typical plan assets (national mean)

The plan reported a net loss of $3M for the year, a single-year figure driven by markets and benefit payments, not a measure of plan health.

Prothena Biosciences Inc 401(k) Plan's outsized position by total assets

Prothena Biosciences Inc 401(k) Plan vs every filed plan by assets

End-of-year total assets · plan year 2022 · DOL Form 5500

$25,715,547 Top 19% higher than 81% of 139,123 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 2022

Prothena Biosciences Inc 401(k) Plan among smaller filed plans by headcount

Plan-year 2022 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Prothena Biosciences Inc 401(k) Plan is a small filing (77 participants) on this national headcount ladder.

Published 5500 schedule card

Filing strip 461256213 · Prothena Biosciences Inc PY 2022 · 401(k)

Prothena Biosciences Inc 401(k) Plan · $26M · 77 · 81st

  • BOY $26M
  • SCH 77
  • EBSA 81st
  • PART 401(k)
  • TYPE near Anderson Development Co. Employees Retirement Savings Plan
  • NET ind #17556

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 →

Prothena Biosciences Inc 401(k) Plan in the asset neighbourhood

Prothena Biosciences Inc 401(k) PlanProthena Biosciences Inc 401…$26MAmerican Transit Insurance Company 401(k) Profit Sharing PlanAmerican Transit Insurance C…$26MVenturedyne Ltd Salaried Defferral Investment PlanVenturedyne Ltd Salaried Def…$26MAdvanced Instruments, LLC Saving and Profit Sharing PlanAdvanced Instruments, LLC Sa…$26MAnderson Development Co. Employees Retirement Savings PlanAnderson Development Co. Emp…$26M
End-of-year total assets ($M) among Prothena Biosciences Inc 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2022.

Scale-class filing particulars (2022)

Total Assets (Beginning of Year)$29M
Net Assets (End of Year)$26M
Net Income-$3M
Employer EIN461256213
Plan Effective Date2013-01-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Prothena Biosciences Inc)

Sponsor-wide plan assets over time

All Prothena Biosciences Inc plans reported in each filing year

Latest sponsor-wide plan assets
$41M 59.61347818111744% vs 2022
2024 filing year
$20M$25M$30M$35M$40M$45M 202220232024 $25.7M $41.1M ▲ +59.6%
Year Plans Participants Total Assets
2022 1 77 $26M
2023 1 115 $34M
2024 1 162 $41M

Nearby 401(k) Plans in California

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

Prothena Biosciences Inc 401(k) Plan vs. nearby 401(k) plans in California, assets vs. participants Scatter plot of 6 data points. -50000050000100000150000200000250000 -200204060 Total assets ($B) Participants Prothena Biosciences Inc 401(k) Plan, Total assets ($B): 0.025715547 · Participants: 77Prothena Biosciences Inc 401(k) PlanWells Fargo & Company 401(k) Plan, Total assets ($B): 45.765616608 · Participants: 205865Wells Fargo & Company 401(k) PlanGoogle LLC 401(k) Savings Plan, Total assets ($B): 28.89820221 · Participants: 102963Google LLC 401(k) Savings PlanOracle Corporation 401(k) Savings and Investment Plan, Total assets ($B): 21.851716605 · Participants: 46320Oracle Corporation 401(k) Savings and Investment PlanChevron Employee Savings Investment Plan, Total assets ($B): 18.60989746 · Participants: 19946Chevron Employee Savings Investment PlanIntel 401(k) Savings Plan, Total assets ($B): 18.361585903 · Participants: 54672Intel 401(k) Savings Plan
Prothena Biosciences Inc 401(k) Plan vs. nearby 401(k) plans in California, assets vs. participants
Compare Prothena Biosciences Inc 401(k) Plan side-by-side with 3 peers →

Prothena Biosciences Inc 401(k) Plan's out-of-state 401(k) peers by assets and headcount

Outside California, the nearest 401(k) by assets is Anderson Development Co. Employees Retirement Savings Plan in MI ($26M); by covered participants it is Accend Services, Inc. 401(k) Plan in MN (77 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (77 participants); asset peers above are excluded.

DOL Form 5500 plan year 2022. Asset totals can differ widely at the same headcount; neither axis is a quality rating.

Frequently Asked Questions

How did Prothena Biosciences Inc 401(k) Plan assets move in 2022? ▼
Prothena Biosciences Inc 401(k) Plan pulled back noticeably - down 10.0% during 2022, from $29M to $26M. Reported net income was -$3M.
How have Prothena Biosciences Inc plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Prothena Biosciences Inc's sponsor-wide assets grew 59.6%, from $26M to $41M.
Where does Prothena Biosciences Inc 401(k) Plan rank by assets among Form 5500 filers? ▼
Prothena Biosciences Inc 401(k) Plan ranks in the 81st percentile by end-of-year assets among 139,126 plans that reported assets for plan year 2022 (in the top quartile of all filed plans by assets).
Which 401(k) plans are similar in size to Prothena Biosciences Inc 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is Anderson Development Co. Employees Retirement Savings Plan in MI ($26M, 114 participants).
Which 401(k) plans cover a similar participant headcount to Prothena Biosciences Inc 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Accend Services, Inc. 401(k) Plan in MN (77 participants, N/A in assets).

Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2022.

Source: DOL EFAST2 filing system (efast.dol.gov) - original filing retrieval by EIN 461256213.

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.