401(k) · DOL Form 5500 · 2024

Prothena Biosciences Inc 401(k) Plan

Data updated 2026-08-25

$41M
Total assets Below avg plan size
162
Participants Small participant base
82nd
Percentile by assets National rank
$253,367
Avg per participant Above avg 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

$41M in assets, 162 participants

Prothena Biosciences Inc's Prothena Biosciences Inc 401(k) Plan reported $41M in total assets and 162 participants in its 2024 DOL Form 5500 filing, ranking in the 82nd 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.

  • #16,598 in Professional & Technical Services (20,173 peers)

Coverage in California

Prothena Biosciences Inc 401(k) Plan covers 162 participants in California, about 26% of the average California filer (state average ~630 per filing). Assets: $41M.

#16,598
in Professional & Technical Services (20,173 peers)
+20.9%
assets growth YoY
0.4×
vs typical plan assets (national mean)

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 2024 · DOL Form 5500

$41,045,479 Top 18% higher than 82% 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

Prothena Biosciences 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. Prothena Biosciences Inc 401(k) Plan sits mid-pack in the medium band (162 participants).

What changed between DOL Form 5500 filings

plan year 2023 → plan year 2024

  • Prothena Biosciences Inc 401(k) Plan reported participants rose from 115 in the plan year 2023 filing to 162 in the plan year 2024 filing.
  • Prothena Biosciences Inc 401(k) Plan end-of-year assets rose from $34M in the plan year 2023 filing to $41M in the plan year 2024 filing.
  • Prothena Biosciences Inc 401(k) Plan reported net income fell from $8M in the plan year 2023 filing to $7M in the plan year 2024 filing.

See the national 2023→2024 release diff →

Published 5500 schedule card

Filing strip 461256213 · Prothena Biosciences Inc PY 2024 · 401(k)

Prothena Biosciences Inc 401(k) Plan · $41M · 162 · 82nd

  • 5500 $41M
  • ASSETS 162
  • PCT 82nd
  • EIN 401(k)
  • RANK near Wohlsen Construction Company 401(k) Plan
  • PHOTO ind #16598

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…$41MWohlsen Construction Company 401(k) PlanWohlsen Construction Company…$41MFalconwood, Inc. 401(k) Profit Sharing Plan and TrustFalconwood, Inc. 401(k) Prof…$41MSumaria Systems, LLC 401(k) Profit Sharing PlanSumaria Systems, LLC 401(k) …$41MKirwan Surgical Products 401(k) Profit Sharing PlanKirwan Surgical Products 401…$41M
End-of-year total assets ($M) among Prothena Biosciences Inc 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2024.

California filing particulars

Total Assets (Beginning of Year)$34M
Net Assets (End of Year)$41M
Net Income$7M
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. -50000050000100000150000 -200204060 Total assets ($B) Participants Prothena Biosciences Inc 401(k) Plan, Total assets ($B): 0.041045479 · Participants: 162Prothena Biosciences Inc 401(k) PlanGoogle LLC 401(k) Savings Plan, Total assets ($B): 48.738057415 · Participants: 116712Google LLC 401(k) Savings PlanOracle Corporation 401(k) Savings and Investment Plan, Total assets ($B): 31.02646504 · Participants: 58962Oracle Corporation 401(k) Savings and Investment PlanIntel 401(k) Savings Plan, Total assets ($B): 24.850880304 · Participants: 55298Intel 401(k) Savings PlanApple 401(k) Plan, Total assets ($B): 24.714519387 · Participants: 101450Apple 401(k) PlanCisco Systems,Inc. 401(k) Plan, Total assets ($B): 22.728425546 · Participants: 40452Cisco Systems,Inc. 401(k) 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 Wohlsen Construction Company 401(k) Plan in PA ($41M); by covered participants it is Central Ohio Urology Group, Inc. 401(k) Profit Sharing Plan in OH (162 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (162 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 Prothena Biosciences Inc 401(k) Plan assets move in 2024? ▼
Prothena Biosciences Inc 401(k) Plan grew sharply - up 20.9% during 2024, from $34M to $41M. Reported net income was $7M.
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 82nd 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 Prothena Biosciences Inc 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is Wohlsen Construction Company 401(k) Plan in PA ($41M, 324 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 Central Ohio Urology Group, Inc. 401(k) Profit Sharing Plan in OH (162 participants, N/A 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 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.