California › Transportation and warehousing › 25,000 or more participants
Form 5500 statement · plan year 1 Jan 2024 to 31 Dec 2024
Supplemental Income 401(k) Plan
Sponsored by Board of Trustees of Supplemental Income Trust Fund, Vallejo, CA
Form 5500 information is as filed by the plan administrator with the Department of Labor and may be amended. Figures reflect the plan year shown, not current balances. Form 5500 contains no individual account balances. Look up the original filing at EFAST2.
In the plan year ending 31 Dec 2024, Supplemental Income 401(k) Plan covered 40,848 participants and held $1.87B in net assets. The plan is a 401(k) plan sponsored by Board of Trustees of Supplemental Income Trust Fund of Vallejo, California. It is a multiemployer plan, maintained under collective bargaining agreements with more than one employer.
Net assets came to $45,668 per participant, well below the $62,774 median for defined contribution plans with 25,000 or more participants and well above the $32,883 median for defined contribution plans in transportation and warehousing. The figure is an average across everyone in the plan, including former employees with small balances; Form 5500 holds no individual account data.
The employer contributed $36.4M during the year, or $1,069 per active participant against a same-size median of $2,417; participants contributed $98.7M and $7.9M arrived as rollovers and other contributions. Benefits paid out totalled $143M.
Schedule C lists 7 service provider organisations paid $5,000 or more, with reported compensation of $6.1M: $149 per participant, well above the same-size median of $36.41. Administrative expenses charged to the plan were $6.9M. Schedule C does not capture every cost: fees netted from fund returns and fees the employer pays directly are outside it.
Across the filings on record, net assets went from $415M in 2009 to $1.87B in 2024 (up 350%), and participants from 19,896 to 40,848 (up 105%).
The independent accountant's opinion on the financial statements was unmodified (unqualified).
Compared with similar plans
| Measure | This plan | Same size | Same industry | All US DC plans |
|---|---|---|---|---|
| Net assets per participant | $45,668 | $62,774 | $32,883 | $53,102 |
| Employer contributions per active participant | $1,069 | $2,417 | $1,396 | $2,175 |
| Schedule C compensation per participant | $149 | $36.41 | $113 | $123 |
| Schedule C compensation, share of net assets | 0.33% | 0.07% | 0.33% | 0.26% |
| Administrative expenses per participant | $170 | $38.81 | $97.79 | $116 |
Peer columns are medians for plan year 2024 across defined contribution plans with 100 or more participants: 25,000 or more participants (608 plans), transportation and warehousing (1,909) and all US plans (63,460). Fee medians cover plans that report an amount.
Trend by plan year
| Plan year | Participants | Net assets | Per participant | Employer contributions | Participant contributions | Schedule C compensation |
|---|---|---|---|---|---|---|
| 2024 | 40,848 | $1.87B | $45,668 | $36.4M | $98.7M | $6.1M |
| 2023 | 39,517 | $1.66B | $41,898 | $35.6M | $87.0M | $5.2M |
| 2022 | 36,861 | $1.42B | $38,559 | $36.3M | $81.3M | $5.2M |
| 2021 | 35,415 | $1.67B | $47,188 | $34.1M | $75.5M | $4.8M |
| 2020 | 34,449 | $1.37B | $39,762 | $32.0M | $65.1M | $3.2M |
| 2019 | 31,225 | $1.23B | $39,404 | $25.9M | $67.6M | $5.8M |
| 2018 | 29,648 | $1.03B | $34,581 | $20.9M | $58.2M | $4.8M |
| 2017 | 27,926 | $1.06B | $37,838 | $16.6M | $51.4M | $5.1M |
| 2016 | 27,178 | $922M | $33,909 | $14.5M | $48.3M | $4.6M |
| 2015 | 27,984 | $849M | $30,324 | $13.6M | $45.5M | $5.0M |
| 2014 | 23,098 | $843M | $36,491 | $12.3M | $40.4M | $4.2M |
| 2013 | 21,380 | $666M | $31,156 | $10.1M | $35.7M | $4.0M |
| 2012 | 21,381 | $564M | $26,363 | $9.6M | $32.3M | $3.5M |
| 2011 | 20,078 | $491M | $24,473 | $9.3M | $35.6M | $3.1M |
| 2010 | 19,645 | $472M | $24,041 | $8.7M | $31.8M | $1.5M |
| 2009 | 19,896 | $415M | $20,837 | $8.5M | $31.2M | $3.3M |
Years in which the plan filed the full Form 5500 with 100 or more participants, from 2009. Plan year is the year in which the plan year began.
Statement for the year
- Net assets, beginning of year$1,655,677,182
- Employer contributions$36,438,232
- Participant contributions$98,718,617
- Rollovers and other contributions$7,943,568
- Total contributions$143,100,417
- Total income, including investment results$355,326,896
- Benefits paid$143,253,189
- Administrative expenses$6,929,647
- Total expenses$150,182,836
- Net income$205,144,060
- Net transfers$4,636,036
- Net assets, end of year$1,865,457,278
Participants
- Active participants34,085
- Retired or separated, receiving benefits—
- Retired or separated, entitled to future benefits6,503
- Participants with account balances40,848
- Total participants, end of year40,848
Fees and service providers
| Organisation | Services reported | Direct | Indirect |
|---|---|---|---|
| Mon Roc Administrators, LLC | Contract Administrator | $2,793,642 | $0 |
| John Hancock Retirement PL Services | Claims processing; Recordkeeping and information management; Participant loan processing; Participant communication | $2,605,667 | $0 |
| Withumsmith+brown, PC | Accounting (including auditing) | $456,030 | $0 |
| Alan D. Biller & Associates, in | Investment advisory (plan) | $87,218 | $0 |
| Stephen Horn Insurance Services | Insurance agents and brokers | $0 | $60,628 |
| Mercer Investments LLC | Consulting (general) | $60,000 | $0 |
| Iron Mountain | Other services | $11,862 | $0 |
Schedule C, Part I line 2: providers that received $5,000 or more, with the form's own service codes. Individuals named on Schedule C (plan employees, individual trustees) are never shown and their compensation is excluded. Eligible indirect compensation disclosed by formula carries no dollar amount. See how to read Schedule C fees.
Administrative expenses on Schedule H
- Recordkeeping fees$3,016,953
- Contract administrator fees$2,793,642
- Legal fees$510,929
- Other administrative expenses$476,162
- Investment advisory and management fees$87,218
- IQPA audit fees$44,743
- Total administrative expenses$6,929,647
Investment structure
Assets at year end by Schedule H category. The form shows the kind of vehicle holding the money, not the funds on the menu.
- Common/collective trusts$1.27B · 68.2%
- Registered investment companies (mutual funds)$312M · 16.7%
- Insurance company general account$233M · 12.5%
- Participant loans$47.7M · 2.6%
- Cash (interest and non-interest bearing)$62K · 0.0%
Audit and compliance answers, as filed
- Accountant's opinionUnmodified (unqualified)
- Audit scope limited under ERISA section 103(a)(3)(C)No
- Accounting firmWithumsmith+brown, PC
- Participant contributions reported as transmitted lateYes, $1,723,894
- Covered by a fidelity bondYes, $1,000,000
- Blackout period during the yearNo
These are the plan administrator's own answers on Schedule H, Part IV. A reported late transmittal is the filer's disclosure of a timing lapse, usually corrected through the Department of Labor's voluntary program; the amount is the total involved, not a loss.
Plan characteristics
2EProfit-sharing plan2FERISA section 404(c) plan2GTotal participant-directed account plan2JCode section 401(k) feature
Codes entered on Form 5500 line 8a, with the labels from the official instructions. Business code 493100: Warehousing & Storage (except lessors of miniwarehouses & self-storage units).
Similar plans in California
| Plan | Sponsor | Participants | Net assets | Per participant |
|---|---|---|---|---|
| Ilwu-Pma Savings (401(K)) Plan | Pacific Maritime Association | 19,810 | $3.44B | $173,649 |
| Club Futuresave Plan | Automobile Club of Southern California | 17,308 | $1.61B | $93,171 |
| Doordash 401(k) Plan | Doordash, Inc. | 13,151 | $439M | $33,357 |
| Teamsters Local Union No 572 Retirement Benefit PL | Board of Trustees, Teamsters Local Union No 572 Retirement Benefit Pla | 8,875 | $5.0M | $569 |
| Cruise, LLC Retirement Trust | Cruise, LLC | 4,033 | $489M | $121,303 |
| Los Angeles Truck Centers, LLC 401(k) Plan | Los Angeles Truck Centers, LLC | 3,423 | $139M | $40,738 |
Defined contribution plans in transportation and warehousing closest in size.
Questions and answers
How big is Supplemental Income 401(k) Plan?
40,848 participants at the end of the plan year ending 31 Dec 2024, of whom 34,085 were active employees, with net assets of $1,865,457,278. Among defined contribution plans that places it in the 25,000 or more participants band, which held 608 plans in plan year 2024.
What does Board of Trustees of Supplemental Income Trust Fund contribute per participant?
The filing reports $36,438,232 in employer contributions for the year, which is $1,069 per active participant; the median for plans of the same type and size was $2,417 in plan year 2024. Form 5500 reports the total only. It does not state the match formula, and the per-participant figure is an average, not any one person's contribution.
What fees does the plan pay and how do they compare?
Schedule C reports $6,075,047 in compensation to service provider organisations, $149 per participant or 0.33% of net assets. The same-size median among plans reporting any Schedule C compensation was $36.41 per participant. Administrative expenses on Schedule H were $6,929,647. Investment costs deducted inside mutual funds and other pooled vehicles are not itemised on Form 5500, so these figures are a floor rather than a full cost.
Who runs the plan?
The sponsor is Board of Trustees of Supplemental Income Trust Fund. Recordkeeping or administration: Mon Roc Administrators, LLC and John Hancock Retirement PL Services. Investment advisory or management: Alan D. Biller & Associates, in. The financial statements were audited by Withumsmith+brown, PC. Form 5500 also names the plan administrator's signer and other individuals; this site publishes organisations only.
Was the audit opinion unqualified?
The filing reports an unmodified (unqualified) opinion. Unmodified (formerly "unqualified") is the standard clean opinion.
How current is this, and does it show my balance?
This is the Form 5500 for the plan year 1 Jan 2024 to 31 Dec 2024, received by the Department of Labor on 14 Oct 2025. Filings are due seven months after the plan year ends, or nine and a half with an extension, so the public record always runs a year or more behind. It contains plan-level totals only: no individual balances, contributions or names of participants exist in the data.
Provenance
Source: U.S. Department of Labor, Employee Benefits Security Administration, Form 5500 research files (Form 5500, Schedule H, Schedule C) for plan years 2009 to 2025, public domain, with filings received through 24 Aug 2026. This page shows the latest filing on record for EIN 94-2554388, plan 002, received 14 Oct 2025; an amended filing replaces it at the next build. Medians and percentiles are computed by this site; see the methodology. Report an error through corrections.