401(k) · DOL Form 5500 · 2023

Annexon, Inc. 401(k) Plan

Data updated 2026-08-25

$5M
Total assets Small plan by assets
81
Participants Small participant base
46th
Percentile by assets National rank
$66,371
Avg per participant Below avg balance/head
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Official DOL plan name: Annexon Biosciences 401(k) Retirement Plan · Sponsored by Annexon, Inc. · California · Professional & Technical Services

$5M in assets, 81 participants

Annexon, Inc.'s Annexon Biosciences 401(k) Retirement Plan reported $5M in total assets and 81 participants in its 2023 DOL Form 5500 filing, ranking in the 46th 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.

  • #8,880 in Professional & Technical Services (20,321 peers)

Annexon, Inc. multi-year trail

Annexon, Inc.'s plans moved +265.5% in assets from 2022 to 2024; this filing shows Annexon Biosciences 401(k) Retirement Plan at $5M / 81 participants.

#8,880
in Professional & Technical Services (20,321 peers)
+149.6%
assets growth YoY

Annexon Biosciences 401(k) Retirement Plan's mid-pack asset rank among Professional & Technical Services and all filers

Annexon Biosciences 401(k) Retirement Plan vs every filed plan by assets

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

$5,376,057 46th percentile higher than 46% 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

Annexon Biosciences 401(k) Retirement Plan among smaller filed plans by headcount

Plan-year 2023 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Annexon Biosciences 401(k) Retirement Plan is a small filing (81 participants) on this national headcount ladder.

What changed between DOL Form 5500 filings

plan year 2022 → plan year 2023

  • Annexon Biosciences 401(k) Retirement Plan reported net income rose from $434K in the plan year 2022 filing to $3M in the plan year 2023 filing.
  • Annexon Biosciences 401(k) Retirement Plan end-of-year assets rose from $2M in the plan year 2022 filing to $5M in the plan year 2023 filing.
  • Annexon Biosciences 401(k) Retirement Plan reported participants rose from 74 in the plan year 2022 filing to 81 in the plan year 2023 filing.

See the national 2022→2023 release diff →

EBSA filing schedule strip

Filing strip 275414423 · Annexon, Inc. PY 2023 · 401(k)

Annexon Biosciences 401(k) Retirement Plan · $5M · 81 · 46th

  • PHOTO $5M
  • IND 81
  • EOY 46th
  • 5500 401(k)
  • ASSETS near Tosh Farms 401(k) Profit Sharing Plan
  • PCT ind #8880

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 →

Annexon Biosciences 401(k) Retirement Plan in the asset neighbourhood

Annexon Biosciences 401(k) Retirement PlanAnnexon Biosciences 401(k) R…$5MTosh Farms 401(k) Profit Sharing PlanTosh Farms 401(k) Profit Sha…$5MPeek 401(k) Plan$5MAgc of Missouri 401(k) Plan$5MMissouri Walnut, LLC 401(k) PlanMissouri Walnut, LLC 401(k) …$5M
End-of-year total assets ($M) among Annexon Biosciences 401(k) Retirement Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

Annexon, Inc. multi-year asset trail

Sponsor-wide plan assets over time

All Annexon, Inc. plans reported in each filing year

Latest sponsor-wide plan assets
$8M 265.5179088591072% vs 2022
2024 filing year
$0M$2M$4M$6M$8M$10M 202220232024 $2.15M $7.87M ▲ +266.0%
Year Plans Participants Total Assets
2022 1 74 $2M
2023 1 81 $5M
2024 1 70 $8M

Annexon, Inc. filing trail (2023)

Total Assets (Beginning of Year)$2M
Net Assets (End of Year)$5M
Net Income$3M
Employer EIN275414423
Plan Effective Date2022-10-01
Filing StatusFILING RECEIVED

Nearby 401(k) Plans in California

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

Annexon Biosciences 401(k) Retirement Plan vs. nearby 401(k) plans in California, assets vs. participants Scatter plot of 6 data points. -50000050000100000150000200000250000 -200204060 Total assets ($B) Participants Annexon Biosciences 401(k) Retirement Plan, Total assets ($B): 0.005376057 · Participants: 81Annexon Biosciences 401(k) Retirement 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
Annexon Biosciences 401(k) Retirement Plan vs. nearby 401(k) plans in California, assets vs. participants
Compare Annexon Biosciences 401(k) Retirement Plan side-by-side with 3 peers →

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

Outside California, the nearest 401(k) by assets is Tosh Farms 401(k) Profit Sharing Plan in TN ($5M); by covered participants it is Vaughn Electric Company,Inc. 401(k) Plan in TN (81 participants). Same-state nearby plans are listed separately above.

Closest by plan assets

Nearest other-state filings by tot_assets_eoy ($5M here).

Similar participant headcount

Nearest other-state filings by covered participants (81 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 Annexon Biosciences 401(k) Retirement Plan assets move in 2023? ▼
Annexon Biosciences 401(k) Retirement Plan surged - up 149.6% during 2023, from $2M to $5M. Reported net income was $3M.
How have Annexon, Inc. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Annexon, Inc.'s sponsor-wide assets grew 265.5%, from $2M to $8M.
Which 401(k) plans are similar in size to Annexon Biosciences 401(k) Retirement Plan? ▼
Among 401(k) plans in other states, the closest by assets is Tosh Farms 401(k) Profit Sharing Plan in TN ($5M, 359 participants).
Which 401(k) plans cover a similar participant headcount to Annexon Biosciences 401(k) Retirement Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Vaughn Electric Company,Inc. 401(k) Plan in TN (81 participants, $5M 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 275414423.

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.