Civic Intelligence

C & O Management Company Inc. DBA Williamson Management Inc.

Plan context: Williamson Management 401(K) Plan

EIN 36-4248939 • Bensenville, IL • 26 filings • 5 plans

215 William StreetBensenville, IL 60106
Current Snapshot

Latest Year

2024

2024 Participants

14

2024 Assets

$751,899

2024 Contributions

$53,935

Historical Graphs

Total Assets Over Time

Aggregate end-of-year assets by filing year, excluding zero-asset years

$836,613$418,307$0199920122024YearValue
$751,899Latest year 2024

Participants Over Time

Largest reported end-of-year plan headcount by filing year, used to avoid double-counting participants across overlapping plans

20100199920122024YearValue
14Latest year 2024

Company Timeline

Year summaries and individual filings are combined here so you can stay in one place while moving across years and plan filings.

Year / FilingFilingsParticipantsAssetsContributionsContrib./Participant
2024114$751,899$53,935$3,853iApproximate average salary by contribution assumption: employee only about $96,313 at 4% or $64,208 at 6%; with 50% employer match about $64,208 at 4% or $42,806 at 6%; with 100% employer match about $48,156 at 4% or $32,104 at 6%.
Williamson Management 401(K) Plan-14$751,899$53,935$3,853iApproximate average salary by contribution assumption: employee only about $96,313 at 4% or $64,208 at 6%; with 50% employer match about $64,208 at 4% or $42,806 at 6%; with 100% employer match about $48,156 at 4% or $32,104 at 6%.
2023116$643,085$51,413$3,213iApproximate average salary by contribution assumption: employee only about $80,333 at 4% or $53,555 at 6%; with 50% employer match about $53,555 at 4% or $35,703 at 6%; with 100% employer match about $40,166 at 4% or $26,778 at 6%.
Williamson Management 401(K) Plan-16$643,085$51,413$3,213iApproximate average salary by contribution assumption: employee only about $80,333 at 4% or $53,555 at 6%; with 50% employer match about $53,555 at 4% or $35,703 at 6%; with 100% employer match about $40,166 at 4% or $26,778 at 6%.
2022115$508,565$44,298$2,953iApproximate average salary by contribution assumption: employee only about $73,830 at 4% or $49,220 at 6%; with 50% employer match about $49,220 at 4% or $32,813 at 6%; with 100% employer match about $36,915 at 4% or $24,610 at 6%.
Williamson Management 401(K) Plan-15$508,565$44,298$2,953iApproximate average salary by contribution assumption: employee only about $73,830 at 4% or $49,220 at 6%; with 50% employer match about $49,220 at 4% or $32,813 at 6%; with 100% employer match about $36,915 at 4% or $24,610 at 6%.
2021116$836,613$46,495$2,906iApproximate average salary by contribution assumption: employee only about $72,648 at 4% or $48,432 at 6%; with 50% employer match about $48,432 at 4% or $32,288 at 6%; with 100% employer match about $36,324 at 4% or $24,216 at 6%.
Williamson Management 401(K) Plan-16$836,613$46,495$2,906iApproximate average salary by contribution assumption: employee only about $72,648 at 4% or $48,432 at 6%; with 50% employer match about $48,432 at 4% or $32,288 at 6%; with 100% employer match about $36,324 at 4% or $24,216 at 6%.
2020117$714,643$48,639$2,861iApproximate average salary by contribution assumption: employee only about $71,528 at 4% or $47,685 at 6%; with 50% employer match about $47,685 at 4% or $31,790 at 6%; with 100% employer match about $35,764 at 4% or $23,843 at 6%.
Williamson Management 401(K) Plan-17$714,643$48,639$2,861iApproximate average salary by contribution assumption: employee only about $71,528 at 4% or $47,685 at 6%; with 50% employer match about $47,685 at 4% or $31,790 at 6%; with 100% employer match about $35,764 at 4% or $23,843 at 6%.
2019120$635,044$70,715$3,536iApproximate average salary by contribution assumption: employee only about $88,394 at 4% or $58,929 at 6%; with 50% employer match about $58,929 at 4% or $39,286 at 6%; with 100% employer match about $44,197 at 4% or $29,465 at 6%.
Williamson Management 401(K) Plan-20$635,044$70,715$3,536iApproximate average salary by contribution assumption: employee only about $88,394 at 4% or $58,929 at 6%; with 50% employer match about $58,929 at 4% or $39,286 at 6%; with 100% employer match about $44,197 at 4% or $29,465 at 6%.
2018112$584,502$38,299$3,192iApproximate average salary by contribution assumption: employee only about $79,790 at 4% or $53,193 at 6%; with 50% employer match about $53,193 at 4% or $35,462 at 6%; with 100% employer match about $39,895 at 4% or $26,597 at 6%.
Williamson Management 401(K) Plan-12$584,502$38,299$3,192iApproximate average salary by contribution assumption: employee only about $79,790 at 4% or $53,193 at 6%; with 50% employer match about $53,193 at 4% or $35,462 at 6%; with 100% employer match about $39,895 at 4% or $26,597 at 6%.
201719$600,481$19,689$2,188iApproximate average salary by contribution assumption: employee only about $54,692 at 4% or $36,461 at 6%; with 50% employer match about $36,461 at 4% or $24,307 at 6%; with 100% employer match about $27,346 at 4% or $18,231 at 6%.
Williamson Management 401(K) Plan-9$600,481$19,689$2,188iApproximate average salary by contribution assumption: employee only about $54,692 at 4% or $36,461 at 6%; with 50% employer match about $36,461 at 4% or $24,307 at 6%; with 100% employer match about $27,346 at 4% or $18,231 at 6%.
2016110$536,645$28,290$2,829iApproximate average salary by contribution assumption: employee only about $70,725 at 4% or $47,150 at 6%; with 50% employer match about $47,150 at 4% or $31,433 at 6%; with 100% employer match about $35,363 at 4% or $23,575 at 6%.
Williamson Management 401(K) Plan-10$536,645$28,290$2,829iApproximate average salary by contribution assumption: employee only about $70,725 at 4% or $47,150 at 6%; with 50% employer match about $47,150 at 4% or $31,433 at 6%; with 100% employer match about $35,363 at 4% or $23,575 at 6%.
2015110$534,511$25,135$2,514iApproximate average salary by contribution assumption: employee only about $62,838 at 4% or $41,892 at 6%; with 50% employer match about $41,892 at 4% or $27,928 at 6%; with 100% employer match about $31,419 at 4% or $20,946 at 6%.
Williamson Management 401(K) Plan-10$534,511$25,135$2,514iApproximate average salary by contribution assumption: employee only about $62,838 at 4% or $41,892 at 6%; with 50% employer match about $41,892 at 4% or $27,928 at 6%; with 100% employer match about $31,419 at 4% or $20,946 at 6%.
2014110$523,070$10,955$1,096iApproximate average salary by contribution assumption: employee only about $27,388 at 4% or $18,258 at 6%; with 50% employer match about $18,258 at 4% or $12,172 at 6%; with 100% employer match about $13,694 at 4% or $9,129 at 6%.
Williamson Management 401(K) Plan-10$523,070$10,955$1,096iApproximate average salary by contribution assumption: employee only about $27,388 at 4% or $18,258 at 6%; with 50% employer match about $18,258 at 4% or $12,172 at 6%; with 100% employer match about $13,694 at 4% or $9,129 at 6%.
2013110$522,589$12,985$1,299iApproximate average salary by contribution assumption: employee only about $32,463 at 4% or $21,642 at 6%; with 50% employer match about $21,642 at 4% or $14,428 at 6%; with 100% employer match about $16,231 at 4% or $10,821 at 6%.
Williamson Management 401(K) Plan-10$522,589$12,985$1,299iApproximate average salary by contribution assumption: employee only about $32,463 at 4% or $21,642 at 6%; with 50% employer match about $21,642 at 4% or $14,428 at 6%; with 100% employer match about $16,231 at 4% or $10,821 at 6%.
2012111$450,404$15,247$1,386iApproximate average salary by contribution assumption: employee only about $34,652 at 4% or $23,102 at 6%; with 50% employer match about $23,102 at 4% or $15,401 at 6%; with 100% employer match about $17,326 at 4% or $11,551 at 6%.
Williamson Management 401(K) Plan-11$450,404$15,247$1,386iApproximate average salary by contribution assumption: employee only about $34,652 at 4% or $23,102 at 6%; with 50% employer match about $23,102 at 4% or $15,401 at 6%; with 100% employer match about $17,326 at 4% or $11,551 at 6%.
2011111$394,637$29,215$2,656iApproximate average salary by contribution assumption: employee only about $66,398 at 4% or $44,265 at 6%; with 50% employer match about $44,265 at 4% or $29,510 at 6%; with 100% employer match about $33,199 at 4% or $22,133 at 6%.
Williamson Management 401(K) Plan-11$394,637$29,215$2,656iApproximate average salary by contribution assumption: employee only about $66,398 at 4% or $44,265 at 6%; with 50% employer match about $44,265 at 4% or $29,510 at 6%; with 100% employer match about $33,199 at 4% or $22,133 at 6%.
2010112$375,976$22,735$1,895iApproximate average salary by contribution assumption: employee only about $47,365 at 4% or $31,576 at 6%; with 50% employer match about $31,576 at 4% or $21,051 at 6%; with 100% employer match about $23,682 at 4% or $15,788 at 6%.
Williamson Management 401(K) Plan-12$375,976$22,735$1,895iApproximate average salary by contribution assumption: employee only about $47,365 at 4% or $31,576 at 6%; with 50% employer match about $31,576 at 4% or $21,051 at 6%; with 100% employer match about $23,682 at 4% or $15,788 at 6%.
2009111$313,791$9,050$823iApproximate average salary by contribution assumption: employee only about $20,568 at 4% or $13,712 at 6%; with 50% employer match about $13,712 at 4% or $9,141 at 6%; with 100% employer match about $10,284 at 4% or $6,856 at 6%.
Williamson Management 401(K) Plan-11$313,791$9,050$823iApproximate average salary by contribution assumption: employee only about $20,568 at 4% or $13,712 at 6%; with 50% employer match about $13,712 at 4% or $9,141 at 6%; with 100% employer match about $10,284 at 4% or $6,856 at 6%.
2008112$241,778$39,126$3,261iApproximate average salary by contribution assumption: employee only about $81,513 at 4% or $54,342 at 6%; with 50% employer match about $54,342 at 4% or $36,228 at 6%; with 100% employer match about $40,756 at 4% or $27,171 at 6%.
Williamson Management 401(K) Plan-12$241,778$39,126$3,261iApproximate average salary by contribution assumption: employee only about $81,513 at 4% or $54,342 at 6%; with 50% employer match about $54,342 at 4% or $36,228 at 6%; with 100% employer match about $40,756 at 4% or $27,171 at 6%.
2007114$329,446$40,280$2,877iApproximate average salary by contribution assumption: employee only about $71,929 at 4% or $47,952 at 6%; with 50% employer match about $47,952 at 4% or $31,968 at 6%; with 100% employer match about $35,964 at 4% or $23,976 at 6%.
Williamson Management 401(K) Plan-14$329,446$40,280$2,877iApproximate average salary by contribution assumption: employee only about $71,929 at 4% or $47,952 at 6%; with 50% employer match about $47,952 at 4% or $31,968 at 6%; with 100% employer match about $35,964 at 4% or $23,976 at 6%.
2006111$262,922$38,146$3,468iApproximate average salary by contribution assumption: employee only about $86,695 at 4% or $57,797 at 6%; with 50% employer match about $57,797 at 4% or $38,531 at 6%; with 100% employer match about $43,348 at 4% or $28,898 at 6%.
Williamson Management 401(K) Plan-11$262,922$38,146$3,468iApproximate average salary by contribution assumption: employee only about $86,695 at 4% or $57,797 at 6%; with 50% employer match about $57,797 at 4% or $38,531 at 6%; with 100% employer match about $43,348 at 4% or $28,898 at 6%.
2005110$211,741$19,284$1,928iApproximate average salary by contribution assumption: employee only about $48,210 at 4% or $32,140 at 6%; with 50% employer match about $32,140 at 4% or $21,427 at 6%; with 100% employer match about $24,105 at 4% or $16,070 at 6%.
Williamson Management 401(K) Plan-10$211,741$19,284$1,928iApproximate average salary by contribution assumption: employee only about $48,210 at 4% or $32,140 at 6%; with 50% employer match about $32,140 at 4% or $21,427 at 6%; with 100% employer match about $24,105 at 4% or $16,070 at 6%.
2004110$178,799$28,615$2,862iApproximate average salary by contribution assumption: employee only about $71,538 at 4% or $47,692 at 6%; with 50% employer match about $47,692 at 4% or $31,794 at 6%; with 100% employer match about $35,769 at 4% or $23,846 at 6%.
Williamson Management 401(K) Plan-10$178,799$28,615$2,862iApproximate average salary by contribution assumption: employee only about $71,538 at 4% or $47,692 at 6%; with 50% employer match about $47,692 at 4% or $31,794 at 6%; with 100% employer match about $35,769 at 4% or $23,846 at 6%.
2003111$158,284$32,838$2,985iApproximate average salary by contribution assumption: employee only about $74,632 at 4% or $49,755 at 6%; with 50% employer match about $49,755 at 4% or $33,170 at 6%; with 100% employer match about $37,316 at 4% or $24,877 at 6%.
Williamson Management 401(K) Plan-11$158,284$32,838$2,985iApproximate average salary by contribution assumption: employee only about $74,632 at 4% or $49,755 at 6%; with 50% employer match about $49,755 at 4% or $33,170 at 6%; with 100% employer match about $37,316 at 4% or $24,877 at 6%.
2002111$101,860$40,314$3,665iApproximate average salary by contribution assumption: employee only about $91,623 at 4% or $61,082 at 6%; with 50% employer match about $61,082 at 4% or $40,721 at 6%; with 100% employer match about $45,811 at 4% or $30,541 at 6%.
Williamson Management 401(K) Plan-11$101,860$40,314$3,665iApproximate average salary by contribution assumption: employee only about $91,623 at 4% or $61,082 at 6%; with 50% employer match about $61,082 at 4% or $40,721 at 6%; with 100% employer match about $45,811 at 4% or $30,541 at 6%.
2001112$0$0-
Williamson Management 401(K) Plan-12---
2000110$117,628$20,794$2,079iApproximate average salary by contribution assumption: employee only about $51,985 at 4% or $34,657 at 6%; with 50% employer match about $34,657 at 4% or $23,104 at 6%; with 100% employer match about $25,993 at 4% or $17,328 at 6%.
Williamson Management 401(K) Plan-10$117,628$20,794$2,079iApproximate average salary by contribution assumption: employee only about $51,985 at 4% or $34,657 at 6%; with 50% employer match about $34,657 at 4% or $23,104 at 6%; with 100% employer match about $25,993 at 4% or $17,328 at 6%.
1999110$104,092$20,480$2,048iApproximate average salary by contribution assumption: employee only about $51,200 at 4% or $34,133 at 6%; with 50% employer match about $34,133 at 4% or $22,756 at 6%; with 100% employer match about $25,600 at 4% or $17,067 at 6%.
Williamson Management 401(K) Plan-10$104,092$20,480$2,048iApproximate average salary by contribution assumption: employee only about $51,200 at 4% or $34,133 at 6%; with 50% employer match about $34,133 at 4% or $22,756 at 6%; with 100% employer match about $25,600 at 4% or $17,067 at 6%.