401(k) · DOL Form 5500 · 2024
Board of Trustees of Supplemental Income Trust Fund 401(k) Plan
Data updated 2026-08-25
- $1.9B
- Total assets Very large vs avg
- 32,778
- Participants Very large workforce
- 99th
- Percentile by assets National rank
- $56,934
- Avg per participant Low balance/head
Official DOL plan name: Supplemental Income 401(k) Plan · Sponsored by Board of Trustees of Supplemental Income Trust Fund · California · Transportation & Warehousing
$1.9B in assets, 32,778 participants
Board of Trustees of Supplemental Income Trust Fund's Supplemental Income 401(k) Plan reported $1.9B in total assets and 32,778 participants in its 2024 DOL Form 5500 filing, ranking in the 99th 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.
- #3,248 in Transportation & Warehousing (3,299 peers)
Coverage in California
Supplemental Income 401(k) Plan covers 32,778 participants in California, 52x the typical California plan (state average ~630 per filing). Assets: $1.9B.
- #3,248
- in Transportation & Warehousing (3,299 peers)
- +12.7%
- assets growth YoY
- 19×
- vs typical plan assets (national mean)
Supplemental Income 401(k) Plan's outsized position by total assets
Supplemental Income 401(k) Plan vs every filed plan by assets
End-of-year total assets · plan year 2024 · DOL Form 5500
$1,866,171,955 Top 1% higher than 99% of 123,620 filed plans
Dashed line + filled bar = this entry, among filed plans.
Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2024
Supplemental Income 401(k) Plan's mega-plan peer group by participant headcount
Plan-year 2024 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Supplemental Income 401(k) Plan is a mega filing (32,778 participants), the rightmost band on the breakdown.
What changed between DOL Form 5500 filings
plan year 2023 → plan year 2024
- Supplemental Income 401(k) Plan end-of-year assets rose from $1.7B in the plan year 2023 filing to $1.9B in the plan year 2024 filing.
- Supplemental Income 401(k) Plan reported net income fell from $227M in the plan year 2023 filing to $205M in the plan year 2024 filing.
- Supplemental Income 401(k) Plan reported participants rose from 30,285 in the plan year 2023 filing to 32,778 in the plan year 2024 filing.
Published 5500 schedule card
Filing strip 942554388 · Board of Trustees of Supplemental Income Trust Fund PY 2024 · 401(k)
Supplemental Income 401(k) Plan · $1.9B · 32,778 · 99th
- SCH $1.9B
- EBSA 32,778
- PART 99th
- TYPE 401(k)
- NET near O'reilly Automotive, Inc. Profit Sharing and Savings Plan
- BOOK ind #3248
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 Transportation & Warehousing retirement plans → · Plans in California →
Supplemental Income 401(k) Plan in the asset neighbourhood
California filing particulars
| Total Assets (Beginning of Year) | $1.7B |
|---|---|
| Net Assets (End of Year) | $1.9B |
| Net Income | $205M |
| Employer EIN | 942554388 |
| Plan Effective Date | 1995-01-01 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (Board of Trustees of Supplemental Income Trust Fund)
Sponsor-wide plan assets over time
All Board of Trustees of Supplemental Income Trust Fund plans reported in each filing year
- Latest sponsor-wide plan assets
- $1.9B 31.22148391320389% vs 2022
- 2024 filing year
| Year | Plans | Participants | Total Assets |
|---|---|---|---|
| 2022 | 1 | 28,894 | $1.4B |
| 2023 | 1 | 30,285 | $1.7B |
| 2024 | 1 | 32,778 | $1.9B |
Nearby 401(k) Plans in California
Peer 401(k) plans, same state, same plan type, ranked by total assets.
- Google LLC 401(k) Savings Plan $48.7B · 116,712
- Oracle Corporation 401(k) Savings and Investment Plan $31.0B · 58,962
- Intel 401(k) Savings Plan $24.9B · 55,298
- Apple 401(k) Plan $24.7B · 101,450
- Cisco Systems,Inc. 401(k) Plan $22.7B · 40,452
Scale composition for Supplemental Income 401(k) Plan
Supplemental Income 401(k) Plan reports $1.9B in end-of-year assets across 32,778 participants (0.015% of the $12.3T held by all Form 5500 filers in the national rollup , and 0.035% of 93,925,755 covered participants) - about $56,934 per participant (41% of the national average assets-per-participant) . Net income for plan year 2024 was $205M.
This plan identity (EIN 942554388, plan #002) has 3 Form 5500 filings on file from 2022 to 2024 , with end-of-year assets moving from $1.4B to $1.9B (+31.2%) while covered participants moved from 28,894 to 32,778 . Single-year sparse filers cannot show that trail.
| Plan year | Participants | EOY assets | Filing |
|---|---|---|---|
| 2022 | 28,894 | $1.4B | Open filing |
| 2023 | 30,285 | $1.7B | Open filing |
| 2024 · index core | 32,778 | $1.9B | This page |
Supplemental Income 401(k) Plan's out-of-state 401(k) peers by assets and headcount
Outside California, the nearest 401(k) by assets is O'reilly Automotive, Inc. Profit Sharing and Savings Plan in MO ($1.9B); by covered participants it is Westrock Company 401(k) Retirement Savings Plan in GA (32,796 participants). Same-state nearby plans are listed separately above.
Closest by plan assets
Nearest other-state filings by tot_assets_eoy ($1.9B here).
- O'reilly Automotive, Inc. Profit Sharing and Savings Plan (MO) $1.9B · 76,538
- Santander 401(k) Plan (PA) $1.9B · 13,334
- Altice USA 401(k) Savings Plan (NY) $1.9B · 9,587
- Dover Corporation Retirement Savings Plan (IL) $1.9B · 12,761
Similar participant headcount
Nearest other-state filings by covered participants (32,778 participants); asset peers above are excluded.
- Westrock Company 401(k) Retirement Savings Plan (GA) 32,796 · 18 off
- Jones Lang Lasalle Savings and Retirement Plan (IL) 32,733 · 45 off
- Global Medical Response, Inc. 401(k) Plan (CO) 32,859 · 81 off
- Maximus, Inc. 401(k) Plan (VA) 32,641 · 137 off
DOL Form 5500 plan year 2024. Asset totals can differ widely at the same headcount; neither axis is a quality rating.