401(k) · DOL Form 5500 · 2024
Board of Trustees of Supplemental Income Trust Fund 401(k) Plan
Data updated 2026-08-11
- $1.9B
- Total assets
- 32,778
- Participants
- 99th
- Percentile by assets
- $56,934
- Avg per participant
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.
- 99th percentile by assets (of 123,622 plans)
- #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.
- $1.9B
- total plan assets (2024 EOY)
- 32,778
- covered participants
- 99th
- percentile by assets (of 123,622 plans)
- $56,934
- avg assets per participant
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.
Participants vs California filers
In California, the average filing covers about 630 participants across 15,291 plans. Supplemental Income 401(k) Plan reports 32,778 participants - 52x that state average ($1.9B EOY assets).
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)
| 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.
Supplemental Income 401(k) Plan vs. nearby 401(k) plans in California, assets vs. participants
- 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 |
Similar-Sized 401(k) Plans Nationally
401(k) plans in other states closest to Supplemental Income 401(k) Plan by total assets, not by location.
- 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
Frequently Asked Questions
How did Supplemental Income 401(k) Plan assets move in 2024? ▼
How have Board of Trustees of Supplemental Income Trust Fund plan assets changed over time? ▼
Where does Supplemental Income 401(k) Plan rank by assets among Form 5500 filers? ▼
Which 401(k) plans are similar in size to Supplemental Income 401(k) Plan? ▼
Next read for Supplemental Income 401(k) Plan
Filing takeaways
Ways to act on Supplemental Income 401(k) Plan's numbers.
- By total assets, Supplemental Income 401(k) Plan ranks among the largest 1% of all filed plans. See the largest plans
- Compare it side-by-side against 3 similar 401(k) plans in California. Compare plans
- Board of Trustees of Supplemental Income Trust Fund's sponsor-wide assets have grown 31.2% since 2022 across 3 plan years on file. More Transportation & Warehousing plans