Civic Intelligence

Williamson Corporation

Plan context: Williamson Corporation 401(K) Plan

EIN 04-2213418 • Concord, MA • 27 filings • 4 plans

70 Domino DriveConcord, MA 01742
Current Snapshot

Latest Year

2025

2025 Participants

39

2025 Assets

$5,034,743

2025 Contributions

$237,461

Historical Graphs

Total Assets Over Time

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

$5,034,743$2,517,372$0199920122025YearValue
$5,034,743Latest year 2025

Participants Over Time

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

39200199920122025YearValue
39Latest year 2025

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
2025139$5,034,743$237,461$6,089iApproximate average salary by contribution assumption: employee only about $152,219 at 4% or $101,479 at 6%; with 50% employer match about $101,479 at 4% or $67,653 at 6%; with 100% employer match about $76,109 at 4% or $50,740 at 6%.
Williamson Corporation 401(K) Plan-39$5,034,743$237,461$6,089iApproximate average salary by contribution assumption: employee only about $152,219 at 4% or $101,479 at 6%; with 50% employer match about $101,479 at 4% or $67,653 at 6%; with 100% employer match about $76,109 at 4% or $50,740 at 6%.
2024135$4,156,338$215,224$6,149iApproximate average salary by contribution assumption: employee only about $153,731 at 4% or $102,488 at 6%; with 50% employer match about $102,488 at 4% or $68,325 at 6%; with 100% employer match about $76,866 at 4% or $51,244 at 6%.
Williamson Corporation 401(K) Plan-35$4,156,338$215,224$6,149iApproximate average salary by contribution assumption: employee only about $153,731 at 4% or $102,488 at 6%; with 50% employer match about $102,488 at 4% or $68,325 at 6%; with 100% employer match about $76,866 at 4% or $51,244 at 6%.
2023132$3,481,834$220,097$6,878iApproximate average salary by contribution assumption: employee only about $171,951 at 4% or $114,634 at 6%; with 50% employer match about $114,634 at 4% or $76,423 at 6%; with 100% employer match about $85,975 at 4% or $57,317 at 6%.
Williamson Corporation 401(K) Plan-32$3,481,834$220,097$6,878iApproximate average salary by contribution assumption: employee only about $171,951 at 4% or $114,634 at 6%; with 50% employer match about $114,634 at 4% or $76,423 at 6%; with 100% employer match about $85,975 at 4% or $57,317 at 6%.
2022134$2,802,640$231,369$6,805iApproximate average salary by contribution assumption: employee only about $170,124 at 4% or $113,416 at 6%; with 50% employer match about $113,416 at 4% or $75,611 at 6%; with 100% employer match about $85,062 at 4% or $56,708 at 6%.
Williamson Corporation 401(K) Plan-34$2,802,640$231,369$6,805iApproximate average salary by contribution assumption: employee only about $170,124 at 4% or $113,416 at 6%; with 50% employer match about $113,416 at 4% or $75,611 at 6%; with 100% employer match about $85,062 at 4% or $56,708 at 6%.
2021128$3,243,130$185,821$6,636iApproximate average salary by contribution assumption: employee only about $165,912 at 4% or $110,608 at 6%; with 50% employer match about $110,608 at 4% or $73,738 at 6%; with 100% employer match about $82,956 at 4% or $55,304 at 6%.
Williamson Corporation 401(K) Plan-28$3,243,130$185,821$6,636iApproximate average salary by contribution assumption: employee only about $165,912 at 4% or $110,608 at 6%; with 50% employer match about $110,608 at 4% or $73,738 at 6%; with 100% employer match about $82,956 at 4% or $55,304 at 6%.
2020124$2,630,600$150,861$6,286iApproximate average salary by contribution assumption: employee only about $157,147 at 4% or $104,765 at 6%; with 50% employer match about $104,765 at 4% or $69,843 at 6%; with 100% employer match about $78,573 at 4% or $52,382 at 6%.
Williamson Corporation 401(K) Plan-24$2,630,600$150,861$6,286iApproximate average salary by contribution assumption: employee only about $157,147 at 4% or $104,765 at 6%; with 50% employer match about $104,765 at 4% or $69,843 at 6%; with 100% employer match about $78,573 at 4% or $52,382 at 6%.
2019127$2,361,368$125,001$4,630iApproximate average salary by contribution assumption: employee only about $115,742 at 4% or $77,161 at 6%; with 50% employer match about $77,161 at 4% or $51,441 at 6%; with 100% employer match about $57,871 at 4% or $38,581 at 6%.
Williamson Corporation 401(K) Plan-27$2,361,368$125,001$4,630iApproximate average salary by contribution assumption: employee only about $115,742 at 4% or $77,161 at 6%; with 50% employer match about $77,161 at 4% or $51,441 at 6%; with 100% employer match about $57,871 at 4% or $38,581 at 6%.
2018126$1,886,762$124,504$4,789iApproximate average salary by contribution assumption: employee only about $119,715 at 4% or $79,810 at 6%; with 50% employer match about $79,810 at 4% or $53,207 at 6%; with 100% employer match about $59,858 at 4% or $39,905 at 6%.
Williamson Corporation 401(K) Plan-26$1,886,762$124,504$4,789iApproximate average salary by contribution assumption: employee only about $119,715 at 4% or $79,810 at 6%; with 50% employer match about $79,810 at 4% or $53,207 at 6%; with 100% employer match about $59,858 at 4% or $39,905 at 6%.
2017125$2,655,758$135,399$5,416iApproximate average salary by contribution assumption: employee only about $135,399 at 4% or $90,266 at 6%; with 50% employer match about $90,266 at 4% or $60,177 at 6%; with 100% employer match about $67,700 at 4% or $45,133 at 6%.
Williamson Corporation 401(K) Plan-25$2,655,758$135,399$5,416iApproximate average salary by contribution assumption: employee only about $135,399 at 4% or $90,266 at 6%; with 50% employer match about $90,266 at 4% or $60,177 at 6%; with 100% employer match about $67,700 at 4% or $45,133 at 6%.
2016126$2,169,842$188,633$7,255iApproximate average salary by contribution assumption: employee only about $181,378 at 4% or $120,919 at 6%; with 50% employer match about $120,919 at 4% or $80,612 at 6%; with 100% employer match about $90,689 at 4% or $60,459 at 6%.
Williamson Corporation 401(K) Plan-26$2,169,842$188,633$7,255iApproximate average salary by contribution assumption: employee only about $181,378 at 4% or $120,919 at 6%; with 50% employer match about $120,919 at 4% or $80,612 at 6%; with 100% employer match about $90,689 at 4% or $60,459 at 6%.
2015124$1,853,526$112,069$4,670iApproximate average salary by contribution assumption: employee only about $116,739 at 4% or $77,826 at 6%; with 50% employer match about $77,826 at 4% or $51,884 at 6%; with 100% employer match about $58,369 at 4% or $38,913 at 6%.
Williamson Corporation 401(K) Plan-24$1,853,526$112,069$4,670iApproximate average salary by contribution assumption: employee only about $116,739 at 4% or $77,826 at 6%; with 50% employer match about $77,826 at 4% or $51,884 at 6%; with 100% employer match about $58,369 at 4% or $38,913 at 6%.
2014128$1,766,679$101,263$3,617iApproximate average salary by contribution assumption: employee only about $90,413 at 4% or $60,276 at 6%; with 50% employer match about $60,276 at 4% or $40,184 at 6%; with 100% employer match about $45,207 at 4% or $30,138 at 6%.
Williamson Corporation 401(K) Plan-28$1,766,679$101,263$3,617iApproximate average salary by contribution assumption: employee only about $90,413 at 4% or $60,276 at 6%; with 50% employer match about $60,276 at 4% or $40,184 at 6%; with 100% employer match about $45,207 at 4% or $30,138 at 6%.
2013116$1,587,092$101,433$6,340iApproximate average salary by contribution assumption: employee only about $158,489 at 4% or $105,659 at 6%; with 50% employer match about $105,659 at 4% or $70,440 at 6%; with 100% employer match about $79,245 at 4% or $52,830 at 6%.
Williamson Corporation 401(K) Plan-16$1,587,092$101,433$6,340iApproximate average salary by contribution assumption: employee only about $158,489 at 4% or $105,659 at 6%; with 50% employer match about $105,659 at 4% or $70,440 at 6%; with 100% employer match about $79,245 at 4% or $52,830 at 6%.
2012114$1,179,628$97,748$6,982iApproximate average salary by contribution assumption: employee only about $174,550 at 4% or $116,367 at 6%; with 50% employer match about $116,367 at 4% or $77,578 at 6%; with 100% employer match about $87,275 at 4% or $58,183 at 6%.
Williamson Corporation 401(K) Plan-14$1,179,628$97,748$6,982iApproximate average salary by contribution assumption: employee only about $174,550 at 4% or $116,367 at 6%; with 50% employer match about $116,367 at 4% or $77,578 at 6%; with 100% employer match about $87,275 at 4% or $58,183 at 6%.
2011110$931,891$67,309$6,731iApproximate average salary by contribution assumption: employee only about $168,273 at 4% or $112,182 at 6%; with 50% employer match about $112,182 at 4% or $74,788 at 6%; with 100% employer match about $84,136 at 4% or $56,091 at 6%.
Williamson Corporation 401(K) Plan-10$931,891$67,309$6,731iApproximate average salary by contribution assumption: employee only about $168,273 at 4% or $112,182 at 6%; with 50% employer match about $112,182 at 4% or $74,788 at 6%; with 100% employer match about $84,136 at 4% or $56,091 at 6%.
2010115$1,313,998$61,451$4,097iApproximate average salary by contribution assumption: employee only about $102,418 at 4% or $68,279 at 6%; with 50% employer match about $68,279 at 4% or $45,519 at 6%; with 100% employer match about $51,209 at 4% or $34,139 at 6%.
Williamson Corporation 401(K) Plan-15$1,313,998$61,451$4,097iApproximate average salary by contribution assumption: employee only about $102,418 at 4% or $68,279 at 6%; with 50% employer match about $68,279 at 4% or $45,519 at 6%; with 100% employer match about $51,209 at 4% or $34,139 at 6%.
2009114$1,123,072$61,917$4,423iApproximate average salary by contribution assumption: employee only about $110,566 at 4% or $73,711 at 6%; with 50% employer match about $73,711 at 4% or $49,140 at 6%; with 100% employer match about $55,283 at 4% or $36,855 at 6%.
Williamson Corporation 401(K) Plan-14$1,123,072$61,917$4,423iApproximate average salary by contribution assumption: employee only about $110,566 at 4% or $73,711 at 6%; with 50% employer match about $73,711 at 4% or $49,140 at 6%; with 100% employer match about $55,283 at 4% or $36,855 at 6%.
2008119$858,215$73,805$3,884iApproximate average salary by contribution assumption: employee only about $97,112 at 4% or $64,741 at 6%; with 50% employer match about $64,741 at 4% or $43,161 at 6%; with 100% employer match about $48,556 at 4% or $32,371 at 6%.
Williamson Corporation 401(K) Plan-19$858,215$73,805$3,884iApproximate average salary by contribution assumption: employee only about $97,112 at 4% or $64,741 at 6%; with 50% employer match about $64,741 at 4% or $43,161 at 6%; with 100% employer match about $48,556 at 4% or $32,371 at 6%.
2007113$1,334,283$70,501$5,423iApproximate average salary by contribution assumption: employee only about $135,579 at 4% or $90,386 at 6%; with 50% employer match about $90,386 at 4% or $60,257 at 6%; with 100% employer match about $67,789 at 4% or $45,193 at 6%.
Williamson Corporation 401(K) Plan-13$1,334,283$70,501$5,423iApproximate average salary by contribution assumption: employee only about $135,579 at 4% or $90,386 at 6%; with 50% employer match about $90,386 at 4% or $60,257 at 6%; with 100% employer match about $67,789 at 4% or $45,193 at 6%.
2006113$1,145,428$61,920$4,763iApproximate average salary by contribution assumption: employee only about $119,077 at 4% or $79,385 at 6%; with 50% employer match about $79,385 at 4% or $52,923 at 6%; with 100% employer match about $59,538 at 4% or $39,692 at 6%.
Williamson Corporation 401(K) Plan-13$1,145,428$61,920$4,763iApproximate average salary by contribution assumption: employee only about $119,077 at 4% or $79,385 at 6%; with 50% employer match about $79,385 at 4% or $52,923 at 6%; with 100% employer match about $59,538 at 4% or $39,692 at 6%.
2005113$925,782$48,146$3,704iApproximate average salary by contribution assumption: employee only about $92,588 at 4% or $61,726 at 6%; with 50% employer match about $61,726 at 4% or $41,150 at 6%; with 100% employer match about $46,294 at 4% or $30,863 at 6%.
Williamson Corporation 401(K) Plan-13$925,782$48,146$3,704iApproximate average salary by contribution assumption: employee only about $92,588 at 4% or $61,726 at 6%; with 50% employer match about $61,726 at 4% or $41,150 at 6%; with 100% employer match about $46,294 at 4% or $30,863 at 6%.
2004111$791,921$44,273$4,025iApproximate average salary by contribution assumption: employee only about $100,620 at 4% or $67,080 at 6%; with 50% employer match about $67,080 at 4% or $44,720 at 6%; with 100% employer match about $50,310 at 4% or $33,540 at 6%.
Williamson Corporation 401(K) Plan-11$791,921$44,273$4,025iApproximate average salary by contribution assumption: employee only about $100,620 at 4% or $67,080 at 6%; with 50% employer match about $67,080 at 4% or $44,720 at 6%; with 100% employer match about $50,310 at 4% or $33,540 at 6%.
2003111$673,077$31,482$2,862iApproximate average salary by contribution assumption: employee only about $71,550 at 4% or $47,700 at 6%; with 50% employer match about $47,700 at 4% or $31,800 at 6%; with 100% employer match about $35,775 at 4% or $23,850 at 6%.
Williamson Corporation 401(K) Plan-11$673,077$31,482$2,862iApproximate average salary by contribution assumption: employee only about $71,550 at 4% or $47,700 at 6%; with 50% employer match about $47,700 at 4% or $31,800 at 6%; with 100% employer match about $35,775 at 4% or $23,850 at 6%.
2002111$503,822$41,621$3,784iApproximate average salary by contribution assumption: employee only about $94,593 at 4% or $63,062 at 6%; with 50% employer match about $63,062 at 4% or $42,041 at 6%; with 100% employer match about $47,297 at 4% or $31,531 at 6%.
Williamson Corporation 401(K) Plan-11$503,822$41,621$3,784iApproximate average salary by contribution assumption: employee only about $94,593 at 4% or $63,062 at 6%; with 50% employer match about $63,062 at 4% or $42,041 at 6%; with 100% employer match about $47,297 at 4% or $31,531 at 6%.
2001113$620,702$44,864$3,451iApproximate average salary by contribution assumption: employee only about $86,277 at 4% or $57,518 at 6%; with 50% employer match about $57,518 at 4% or $38,345 at 6%; with 100% employer match about $43,138 at 4% or $28,759 at 6%.
Williamson Corporation 401(K) Plan-13$620,702$44,864$3,451iApproximate average salary by contribution assumption: employee only about $86,277 at 4% or $57,518 at 6%; with 50% employer match about $57,518 at 4% or $38,345 at 6%; with 100% employer match about $43,138 at 4% or $28,759 at 6%.
2000114$640,293$42,649$3,046iApproximate average salary by contribution assumption: employee only about $76,159 at 4% or $50,773 at 6%; with 50% employer match about $50,773 at 4% or $33,848 at 6%; with 100% employer match about $38,079 at 4% or $25,386 at 6%.
Williamson Corporation 401(K) Plan-14$640,293$42,649$3,046iApproximate average salary by contribution assumption: employee only about $76,159 at 4% or $50,773 at 6%; with 50% employer match about $50,773 at 4% or $33,848 at 6%; with 100% employer match about $38,079 at 4% or $25,386 at 6%.
1999114$628,051$49,920$3,566iApproximate average salary by contribution assumption: employee only about $89,143 at 4% or $59,429 at 6%; with 50% employer match about $59,429 at 4% or $39,619 at 6%; with 100% employer match about $44,571 at 4% or $29,714 at 6%.
Williamson Corporation 401(K) Plan-14$628,051$49,920$3,566iApproximate average salary by contribution assumption: employee only about $89,143 at 4% or $59,429 at 6%; with 50% employer match about $59,429 at 4% or $39,619 at 6%; with 100% employer match about $44,571 at 4% or $29,714 at 6%.