401(k) · DOL Form 5500 · 2024

Ionis Pharmaceuticals, Inc. 401(k) Plan

Data updated 2026-08-25

$316M
Total assets Above avg plan size
897
Participants Near avg headcount
96th
Percentile by assets National rank
$352,240
Avg per participant High balance/head
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Official DOL plan name: Ionis Pharmaceuticals 401(k) Plan · Sponsored by Ionis Pharmaceuticals, Inc. · California · Professional & Technical Services

$316M in assets, 897 participants

Ionis Pharmaceuticals, Inc.'s Ionis Pharmaceuticals 401(k) Plan reported $316M in total assets and 897 participants in its 2024 DOL Form 5500 filing, ranking in the 96th 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.

  • #19,566 in Professional & Technical Services (20,173 peers)

Where Ionis Pharmaceuticals 401(k) Plan sits by assets

Ionis Pharmaceuticals 401(k) Plan sits in the top 5% of all filed plans by assets, $316M for 897 participants (~$352,240/participant), up 24.0% in 2024.

#19,566
in Professional & Technical Services (20,173 peers)
+24.0%
assets growth YoY
3.2×
vs typical plan assets (national mean)

Ionis Pharmaceuticals 401(k) Plan's outsized position by total assets

Ionis Pharmaceuticals 401(k) Plan vs every filed plan by assets

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

$315,959,406 Top 4% higher than 96% 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

Ionis Pharmaceuticals 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. Ionis Pharmaceuticals 401(k) Plan sits mid-pack in the medium band (897 participants).

What changed between DOL Form 5500 filings

plan year 2023 → plan year 2024

  • Ionis Pharmaceuticals 401(k) Plan end-of-year assets rose from $255M in the plan year 2023 filing to $316M in the plan year 2024 filing.
  • Ionis Pharmaceuticals 401(k) Plan reported participants rose from 760 in the plan year 2023 filing to 897 in the plan year 2024 filing.
  • Ionis Pharmaceuticals 401(k) Plan reported net income rose from $60M in the plan year 2023 filing to $61M in the plan year 2024 filing.

See the national 2023→2024 release diff →

DOL schedule card

Filing strip 330336973 · Ionis Pharmaceuticals, Inc. PY 2024 · 401(k)

Ionis Pharmaceuticals 401(k) Plan · $316M · 897 · 96th

  • EIN $316M
  • EIN 897
  • EIN 96th
  • EIN 401(k)
  • EIN near Dassault Falcon Jet Corp. 401(k) Investment and Savings Plan
  • EIN ind #19566

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 →

Ionis Pharmaceuticals 401(k) Plan in the asset neighbourhood

Dassault Falcon Jet Corp. 401(k) Investment and Savings PlanDassault Falcon Jet Corp. 40…$316MIonis Pharmaceuticals 401(k) PlanIonis Pharmaceuticals 401(k)…$316MBaycare Clinic 401(k) Retirement Savings PlanBaycare Clinic 401(k) Retire…$316MProfit Sharing and 401(k) Plan for Employees of Carlton FieldsProfit Sharing and 401(k) Pl…$316MSecurity Service Federal Credit Union Cash Accumulation Plan and TrustSecurity Service Federal Cre…$316M
End-of-year total assets ($M) among Ionis Pharmaceuticals 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2024.

Scale-class filing particulars (2024)

Total Assets (Beginning of Year)$255M
Net Assets (End of Year)$316M
Net Income$61M
Employer EIN330336973
Plan Effective Date1991-01-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Ionis Pharmaceuticals, Inc.)

Sponsor-wide plan assets over time

All Ionis Pharmaceuticals, Inc. plans reported in each filing year

Latest sponsor-wide plan assets
$316M 61.98715340408112% vs 2022
2024 filing year
$150M$200M$250M$300M$350M 202220232024 $195M $316M ▲ +62.0%
Year Plans Participants Total Assets
2022 1 609 $195M
2023 1 760 $255M
2024 1 897 $316M

Nearby 401(k) Plans in California

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

Ionis Pharmaceuticals 401(k) Plan vs. nearby 401(k) plans in California, assets vs. participants Scatter plot of 6 data points. -50000050000100000150000 -200204060 Total assets ($B) Participants Ionis Pharmaceuticals 401(k) Plan, Total assets ($B): 0.315959406 · Participants: 897Ionis Pharmaceuticals 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
Ionis Pharmaceuticals 401(k) Plan vs. nearby 401(k) plans in California, assets vs. participants
Compare Ionis Pharmaceuticals 401(k) Plan side-by-side with 3 peers →

Ionis Pharmaceuticals 401(k) Plan's out-of-state 401(k) peers by assets and headcount

Outside California, the nearest 401(k) by assets is Dassault Falcon Jet Corp. 401(k) Investment and Savings Plan in NJ ($316M); by covered participants it is Metso Retirement Savings Plan in WI (897 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (897 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 Ionis Pharmaceuticals 401(k) Plan assets move in 2024? ▼
Ionis Pharmaceuticals 401(k) Plan grew sharply - up 24.0% during 2024, from $255M to $316M. Reported net income was $61M.
How have Ionis Pharmaceuticals, Inc. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Ionis Pharmaceuticals, Inc.'s sponsor-wide assets grew 62.0%, from $195M to $316M.
Where does Ionis Pharmaceuticals 401(k) Plan rank by assets among Form 5500 filers? ▼
Ionis Pharmaceuticals 401(k) Plan ranks in the 96th percentile by end-of-year assets among 123,622 plans that reported assets for plan year 2024 (in the top 5% of all filed plans by assets).
Which 401(k) plans are similar in size to Ionis Pharmaceuticals 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is Dassault Falcon Jet Corp. 401(k) Investment and Savings Plan in NJ ($316M, 2,462 participants).
Which 401(k) plans cover a similar participant headcount to Ionis Pharmaceuticals 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Metso Retirement Savings Plan in WI (897 participants, $280M 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 330336973.

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.