Civic Intelligence

Isthmus Engineering and Manufacturi

Plan context: Isthmus Engineering and Manufacturing Employees' Retirement Plan

EIN 39-1422973 • Madison, WI • 25 filings • 4 plans

4035 Owl Creek DriveMadison, WI 53718
Current Snapshot

Latest Year

2024

2024 Participants

76

2024 Assets

$28,929,343

2024 Contributions

$1,885,444

Historical Graphs

Total Assets Over Time

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

$28,929,343$14,464,672$0200020132024YearValue
$28,929,343Latest year 2024

Participants Over Time

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

89450200020122024YearValue
76Latest 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
2024176$28,929,343$1,885,444$24,808iApproximate average salary by contribution assumption: employee only about $620,212 at 4% or $413,475 at 6%; with 50% employer match about $413,475 at 4% or $275,650 at 6%; with 100% employer match about $310,106 at 4% or $206,737 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-76$28,929,343$1,885,444$24,808iApproximate average salary by contribution assumption: employee only about $620,212 at 4% or $413,475 at 6%; with 50% employer match about $413,475 at 4% or $275,650 at 6%; with 100% employer match about $310,106 at 4% or $206,737 at 6%.
2023189$23,846,172$1,405,193$15,789iApproximate average salary by contribution assumption: employee only about $394,717 at 4% or $263,145 at 6%; with 50% employer match about $263,145 at 4% or $175,430 at 6%; with 100% employer match about $197,359 at 4% or $131,572 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-89$23,846,172$1,405,193$15,789iApproximate average salary by contribution assumption: employee only about $394,717 at 4% or $263,145 at 6%; with 50% employer match about $263,145 at 4% or $175,430 at 6%; with 100% employer match about $197,359 at 4% or $131,572 at 6%.
2022189$20,100,021$1,260,352$14,161iApproximate average salary by contribution assumption: employee only about $354,031 at 4% or $236,021 at 6%; with 50% employer match about $236,021 at 4% or $157,347 at 6%; with 100% employer match about $177,016 at 4% or $118,010 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-89$20,100,021$1,260,352$14,161iApproximate average salary by contribution assumption: employee only about $354,031 at 4% or $236,021 at 6%; with 50% employer match about $236,021 at 4% or $157,347 at 6%; with 100% employer match about $177,016 at 4% or $118,010 at 6%.
2021184$25,327,378$1,143,738$13,616iApproximate average salary by contribution assumption: employee only about $340,398 at 4% or $226,932 at 6%; with 50% employer match about $226,932 at 4% or $151,288 at 6%; with 100% employer match about $170,199 at 4% or $113,466 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-84$25,327,378$1,143,738$13,616iApproximate average salary by contribution assumption: employee only about $340,398 at 4% or $226,932 at 6%; with 50% employer match about $226,932 at 4% or $151,288 at 6%; with 100% employer match about $170,199 at 4% or $113,466 at 6%.
2020180$20,676,732$1,067,925$13,349iApproximate average salary by contribution assumption: employee only about $333,727 at 4% or $222,484 at 6%; with 50% employer match about $222,484 at 4% or $148,323 at 6%; with 100% employer match about $166,863 at 4% or $111,242 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-80$20,676,732$1,067,925$13,349iApproximate average salary by contribution assumption: employee only about $333,727 at 4% or $222,484 at 6%; with 50% employer match about $222,484 at 4% or $148,323 at 6%; with 100% employer match about $166,863 at 4% or $111,242 at 6%.
2019179$16,510,821$1,099,478$13,917iApproximate average salary by contribution assumption: employee only about $347,936 at 4% or $231,957 at 6%; with 50% employer match about $231,957 at 4% or $154,638 at 6%; with 100% employer match about $173,968 at 4% or $115,979 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-79$16,510,821$1,099,478$13,917iApproximate average salary by contribution assumption: employee only about $347,936 at 4% or $231,957 at 6%; with 50% employer match about $231,957 at 4% or $154,638 at 6%; with 100% employer match about $173,968 at 4% or $115,979 at 6%.
2018176$12,703,099$944,014$12,421iApproximate average salary by contribution assumption: employee only about $310,531 at 4% or $207,021 at 6%; with 50% employer match about $207,021 at 4% or $138,014 at 6%; with 100% employer match about $155,265 at 4% or $103,510 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-76$12,703,099$944,014$12,421iApproximate average salary by contribution assumption: employee only about $310,531 at 4% or $207,021 at 6%; with 50% employer match about $207,021 at 4% or $138,014 at 6%; with 100% employer match about $155,265 at 4% or $103,510 at 6%.
2017169$12,717,702$828,953$12,014iApproximate average salary by contribution assumption: employee only about $300,345 at 4% or $200,230 at 6%; with 50% employer match about $200,230 at 4% or $133,487 at 6%; with 100% employer match about $150,173 at 4% or $100,115 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-69$12,717,702$828,953$12,014iApproximate average salary by contribution assumption: employee only about $300,345 at 4% or $200,230 at 6%; with 50% employer match about $200,230 at 4% or $133,487 at 6%; with 100% employer match about $150,173 at 4% or $100,115 at 6%.
2016164$10,052,550$770,446$12,038iApproximate average salary by contribution assumption: employee only about $300,955 at 4% or $200,637 at 6%; with 50% employer match about $200,637 at 4% or $133,758 at 6%; with 100% employer match about $150,478 at 4% or $100,318 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-64$10,052,550$770,446$12,038iApproximate average salary by contribution assumption: employee only about $300,955 at 4% or $200,637 at 6%; with 50% employer match about $200,637 at 4% or $133,758 at 6%; with 100% employer match about $150,478 at 4% or $100,318 at 6%.
2015160$8,530,431$848,378$14,140iApproximate average salary by contribution assumption: employee only about $353,491 at 4% or $235,661 at 6%; with 50% employer match about $235,661 at 4% or $157,107 at 6%; with 100% employer match about $176,745 at 4% or $117,830 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-60$8,530,431$848,378$14,140iApproximate average salary by contribution assumption: employee only about $353,491 at 4% or $235,661 at 6%; with 50% employer match about $235,661 at 4% or $157,107 at 6%; with 100% employer match about $176,745 at 4% or $117,830 at 6%.
2014161$7,957,790$655,505$10,746iApproximate average salary by contribution assumption: employee only about $268,650 at 4% or $179,100 at 6%; with 50% employer match about $179,100 at 4% or $119,400 at 6%; with 100% employer match about $134,325 at 4% or $89,550 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-61$7,957,790$655,505$10,746iApproximate average salary by contribution assumption: employee only about $268,650 at 4% or $179,100 at 6%; with 50% employer match about $179,100 at 4% or $119,400 at 6%; with 100% employer match about $134,325 at 4% or $89,550 at 6%.
2013156$6,759,462$593,251$10,594iApproximate average salary by contribution assumption: employee only about $264,844 at 4% or $176,563 at 6%; with 50% employer match about $176,563 at 4% or $117,709 at 6%; with 100% employer match about $132,422 at 4% or $88,281 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-56$6,759,462$593,251$10,594iApproximate average salary by contribution assumption: employee only about $264,844 at 4% or $176,563 at 6%; with 50% employer match about $176,563 at 4% or $117,709 at 6%; with 100% employer match about $132,422 at 4% or $88,281 at 6%.
2012154$4,888,599$559,395$10,359iApproximate average salary by contribution assumption: employee only about $258,979 at 4% or $172,653 at 6%; with 50% employer match about $172,653 at 4% or $115,102 at 6%; with 100% employer match about $129,490 at 4% or $86,326 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-54$4,888,599$559,395$10,359iApproximate average salary by contribution assumption: employee only about $258,979 at 4% or $172,653 at 6%; with 50% employer match about $172,653 at 4% or $115,102 at 6%; with 100% employer match about $129,490 at 4% or $86,326 at 6%.
2011150$3,675,622$418,651$8,373iApproximate average salary by contribution assumption: employee only about $209,326 at 4% or $139,550 at 6%; with 50% employer match about $139,550 at 4% or $93,034 at 6%; with 100% employer match about $104,663 at 4% or $69,775 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-50$3,675,622$418,651$8,373iApproximate average salary by contribution assumption: employee only about $209,326 at 4% or $139,550 at 6%; with 50% employer match about $139,550 at 4% or $93,034 at 6%; with 100% employer match about $104,663 at 4% or $69,775 at 6%.
2010150$3,552,698$445,062$8,901iApproximate average salary by contribution assumption: employee only about $222,531 at 4% or $148,354 at 6%; with 50% employer match about $148,354 at 4% or $98,903 at 6%; with 100% employer match about $111,266 at 4% or $74,177 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-50$3,552,698$445,062$8,901iApproximate average salary by contribution assumption: employee only about $222,531 at 4% or $148,354 at 6%; with 50% employer match about $148,354 at 4% or $98,903 at 6%; with 100% employer match about $111,266 at 4% or $74,177 at 6%.
2009147$2,731,971$392,748$8,356iApproximate average salary by contribution assumption: employee only about $208,909 at 4% or $139,272 at 6%; with 50% employer match about $139,272 at 4% or $92,848 at 6%; with 100% employer match about $104,454 at 4% or $69,636 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-47$2,731,971$392,748$8,356iApproximate average salary by contribution assumption: employee only about $208,909 at 4% or $139,272 at 6%; with 50% employer match about $139,272 at 4% or $92,848 at 6%; with 100% employer match about $104,454 at 4% or $69,636 at 6%.
2008153$1,850,045$393,171$7,418iApproximate average salary by contribution assumption: employee only about $185,458 at 4% or $123,639 at 6%; with 50% employer match about $123,639 at 4% or $82,426 at 6%; with 100% employer match about $92,729 at 4% or $61,819 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-53$1,850,045$393,171$7,418iApproximate average salary by contribution assumption: employee only about $185,458 at 4% or $123,639 at 6%; with 50% employer match about $123,639 at 4% or $82,426 at 6%; with 100% employer match about $92,729 at 4% or $61,819 at 6%.
2007153$0$0-
Isthmus Engineering and Manufacturing Employees' Retirement Plan-53---
2006150$1,928,126$335,826$6,717iApproximate average salary by contribution assumption: employee only about $167,913 at 4% or $111,942 at 6%; with 50% employer match about $111,942 at 4% or $74,628 at 6%; with 100% employer match about $83,957 at 4% or $55,971 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-50$1,928,126$335,826$6,717iApproximate average salary by contribution assumption: employee only about $167,913 at 4% or $111,942 at 6%; with 50% employer match about $111,942 at 4% or $74,628 at 6%; with 100% employer match about $83,957 at 4% or $55,971 at 6%.
2005146$1,365,506$286,613$6,231iApproximate average salary by contribution assumption: employee only about $155,768 at 4% or $103,845 at 6%; with 50% employer match about $103,845 at 4% or $69,230 at 6%; with 100% employer match about $77,884 at 4% or $51,923 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-46$1,365,506$286,613$6,231iApproximate average salary by contribution assumption: employee only about $155,768 at 4% or $103,845 at 6%; with 50% employer match about $103,845 at 4% or $69,230 at 6%; with 100% employer match about $77,884 at 4% or $51,923 at 6%.
2004143$1,001,487$231,726$5,389iApproximate average salary by contribution assumption: employee only about $134,724 at 4% or $89,816 at 6%; with 50% employer match about $89,816 at 4% or $59,878 at 6%; with 100% employer match about $67,362 at 4% or $44,908 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-43$1,001,487$231,726$5,389iApproximate average salary by contribution assumption: employee only about $134,724 at 4% or $89,816 at 6%; with 50% employer match about $89,816 at 4% or $59,878 at 6%; with 100% employer match about $67,362 at 4% or $44,908 at 6%.
2003139$0$0-
Isthmus Engineering and Manufacturing Employees' Retirement Plan-39---
2002117$436,209$109,122$6,419iApproximate average salary by contribution assumption: employee only about $160,474 at 4% or $106,982 at 6%; with 50% employer match about $106,982 at 4% or $71,322 at 6%; with 100% employer match about $80,237 at 4% or $53,491 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-17$436,209$109,122$6,419iApproximate average salary by contribution assumption: employee only about $160,474 at 4% or $106,982 at 6%; with 50% employer match about $106,982 at 4% or $71,322 at 6%; with 100% employer match about $80,237 at 4% or $53,491 at 6%.
2001124$461,238$126,568$5,274iApproximate average salary by contribution assumption: employee only about $131,842 at 4% or $87,894 at 6%; with 50% employer match about $87,894 at 4% or $58,596 at 6%; with 100% employer match about $65,921 at 4% or $43,947 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-24$461,238$126,568$5,274iApproximate average salary by contribution assumption: employee only about $131,842 at 4% or $87,894 at 6%; with 50% employer match about $87,894 at 4% or $58,596 at 6%; with 100% employer match about $65,921 at 4% or $43,947 at 6%.
2000121$371,054$103,336$4,921iApproximate average salary by contribution assumption: employee only about $123,019 at 4% or $82,013 at 6%; with 50% employer match about $82,013 at 4% or $54,675 at 6%; with 100% employer match about $61,510 at 4% or $41,006 at 6%.
Isthmus Engineering and Manufacturing Employees' Retirement Plan-21$371,054$103,336$4,921iApproximate average salary by contribution assumption: employee only about $123,019 at 4% or $82,013 at 6%; with 50% employer match about $82,013 at 4% or $54,675 at 6%; with 100% employer match about $61,510 at 4% or $41,006 at 6%.