Civic Intelligence

Mark J. Sokolowski, MD Sc

Plan context: Mark J. Sokolowski, MD Sc 401(K) Plan

EIN 26-3499165 • Oak Park, IL • 25 filings • 2 plans

1 Erie CourtSuite 7010Oak Park, IL 60302
Current Snapshot

Latest Year

2025

2025 Participants

8

2025 Assets

$1,913,107

2025 Contributions

$90,369

Historical Graphs

Total Assets Over Time

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

$3,436,834$1,718,417$0201320192025YearValue
$1,913,107Latest year 2025

Participants Over Time

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

840201320192025YearValue
8Latest 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
202518$1,913,107$90,369$11,296iApproximate average salary by contribution assumption: employee only about $282,403 at 4% or $188,269 at 6%; with 50% employer match about $188,269 at 4% or $125,513 at 6%; with 100% employer match about $141,202 at 4% or $94,134 at 6%.
Mark J. Sokolowski, MD Sc 401(K) Plan-8$1,913,107$90,369$11,296iApproximate average salary by contribution assumption: employee only about $282,403 at 4% or $188,269 at 6%; with 50% employer match about $188,269 at 4% or $125,513 at 6%; with 100% employer match about $141,202 at 4% or $94,134 at 6%.
202428$3,436,834$68,485$8,561iApproximate average salary by contribution assumption: employee only about $214,016 at 4% or $142,677 at 6%; with 50% employer match about $142,677 at 4% or $95,118 at 6%; with 100% employer match about $107,008 at 4% or $71,339 at 6%.
MARK J. SOKOLOWSKI, M.D., S.C. CASH BALANCE PLAN-4$2,035,492$0-
Mark J. Sokolowski, MD Sc 401(K) Plan-8$1,401,342$68,485$8,561iApproximate average salary by contribution assumption: employee only about $214,016 at 4% or $142,677 at 6%; with 50% employer match about $142,677 at 4% or $95,118 at 6%; with 100% employer match about $107,008 at 4% or $71,339 at 6%.
202326$2,815,477$317,872$52,979iApproximate average salary by contribution assumption: employee only about $1,324,467 at 4% or $882,978 at 6%; with 50% employer match about $882,978 at 4% or $588,652 at 6%; with 100% employer match about $662,233 at 4% or $441,489 at 6%.
MARK J. SOKOLOWSKI, M.D., S.C. CASH BALANCE PLAN-5$1,732,372$264,257$52,851iApproximate average salary by contribution assumption: employee only about $1,321,285 at 4% or $880,857 at 6%; with 50% employer match about $880,857 at 4% or $587,238 at 6%; with 100% employer match about $660,643 at 4% or $440,428 at 6%.
Mark J. Sokolowski, MD Sc 401(K) Plan-6$1,083,105$53,615$8,936iApproximate average salary by contribution assumption: employee only about $223,396 at 4% or $148,931 at 6%; with 50% employer match about $148,931 at 4% or $99,287 at 6%; with 100% employer match about $111,698 at 4% or $74,465 at 6%.
202226$2,111,908$482,356$80,393iApproximate average salary by contribution assumption: employee only about $2,009,817 at 4% or $1,339,878 at 6%; with 50% employer match about $1,339,878 at 4% or $893,252 at 6%; with 100% employer match about $1,004,908 at 4% or $669,939 at 6%.
MARK J. SOKOLOWSKI, M.D., S.C. CASH BALANCE PLAN-4$1,276,899$400,000$100,000iApproximate average salary by contribution assumption: employee only about $2,500,000 at 4% or $1,666,667 at 6%; with 50% employer match about $1,666,667 at 4% or $1,111,111 at 6%; with 100% employer match about $1,250,000 at 4% or $833,333 at 6%.
Mark J. Sokolowski, MD Sc 401(K) Plan-6$835,009$82,356$13,726iApproximate average salary by contribution assumption: employee only about $343,150 at 4% or $228,767 at 6%; with 50% employer match about $228,767 at 4% or $152,511 at 6%; with 100% employer match about $171,575 at 4% or $114,383 at 6%.
202126$1,968,452$155,177$25,863iApproximate average salary by contribution assumption: employee only about $646,571 at 4% or $431,047 at 6%; with 50% employer match about $431,047 at 4% or $287,365 at 6%; with 100% employer match about $323,285 at 4% or $215,524 at 6%.
MARK J. SOKOLOWSKI, M.D., S.C. CASH BALANCE PLAN-4$1,033,848$83,000$20,750iApproximate average salary by contribution assumption: employee only about $518,750 at 4% or $345,833 at 6%; with 50% employer match about $345,833 at 4% or $230,556 at 6%; with 100% employer match about $259,375 at 4% or $172,917 at 6%.
Mark J. Sokolowski, MD Sc 401(K) Plan-6$934,604$72,177$12,030iApproximate average salary by contribution assumption: employee only about $300,738 at 4% or $200,492 at 6%; with 50% employer match about $200,492 at 4% or $133,661 at 6%; with 100% employer match about $150,369 at 4% or $100,246 at 6%.
202026$1,558,814$164,986$27,498iApproximate average salary by contribution assumption: employee only about $687,442 at 4% or $458,294 at 6%; with 50% employer match about $458,294 at 4% or $305,530 at 6%; with 100% employer match about $343,721 at 4% or $229,147 at 6%.
MARK J. SOKOLOWSKI, M.D., S.C. CASH BALANCE PLAN-5$843,638$85,738$17,148iApproximate average salary by contribution assumption: employee only about $428,690 at 4% or $285,793 at 6%; with 50% employer match about $285,793 at 4% or $190,529 at 6%; with 100% employer match about $214,345 at 4% or $142,897 at 6%.
Mark J. Sokolowski, MD Sc 401(K) Plan-6$715,176$79,248$13,208iApproximate average salary by contribution assumption: employee only about $330,200 at 4% or $220,133 at 6%; with 50% employer match about $220,133 at 4% or $146,756 at 6%; with 100% employer match about $165,100 at 4% or $110,067 at 6%.
201926$1,267,671$162,455$27,076iApproximate average salary by contribution assumption: employee only about $676,896 at 4% or $451,264 at 6%; with 50% employer match about $451,264 at 4% or $300,843 at 6%; with 100% employer match about $338,448 at 4% or $225,632 at 6%.
MARK J. SOKOLOWSKI, M.D., S.C. CASH BALANCE PLAN-5$733,773$84,225$16,845iApproximate average salary by contribution assumption: employee only about $421,125 at 4% or $280,750 at 6%; with 50% employer match about $280,750 at 4% or $187,167 at 6%; with 100% employer match about $210,563 at 4% or $140,375 at 6%.
Mark J. Sokolowski, MD Sc 401(K) Plan-6$533,898$78,230$13,038iApproximate average salary by contribution assumption: employee only about $325,958 at 4% or $217,306 at 6%; with 50% employer match about $217,306 at 4% or $144,870 at 6%; with 100% employer match about $162,979 at 4% or $108,653 at 6%.
201826$869,658$156,989$26,165iApproximate average salary by contribution assumption: employee only about $654,121 at 4% or $436,081 at 6%; with 50% employer match about $436,081 at 4% or $290,720 at 6%; with 100% employer match about $327,060 at 4% or $218,040 at 6%.
MARK J. SOKOLOWSKI, M.D., S.C. CASH BALANCE PLAN-5$528,456$82,568$16,514iApproximate average salary by contribution assumption: employee only about $412,840 at 4% or $275,227 at 6%; with 50% employer match about $275,227 at 4% or $183,484 at 6%; with 100% employer match about $206,420 at 4% or $137,613 at 6%.
Mark J. Sokolowski, MD Sc 401(K) Plan-6$341,202$74,421$12,404iApproximate average salary by contribution assumption: employee only about $310,088 at 4% or $206,725 at 6%; with 50% employer match about $206,725 at 4% or $137,817 at 6%; with 100% employer match about $155,044 at 4% or $103,363 at 6%.
201727$772,604$138,532$19,790iApproximate average salary by contribution assumption: employee only about $494,757 at 4% or $329,838 at 6%; with 50% employer match about $329,838 at 4% or $219,892 at 6%; with 100% employer match about $247,379 at 4% or $164,919 at 6%.
MARK J. SOKOLOWSKI, M.D., S.C. CASH BALANCE PLAN-5$485,259$80,339$16,068iApproximate average salary by contribution assumption: employee only about $401,695 at 4% or $267,797 at 6%; with 50% employer match about $267,797 at 4% or $178,531 at 6%; with 100% employer match about $200,848 at 4% or $133,898 at 6%.
Mark J. Sokolowski, MD Sc 401(K) Plan-7$287,345$58,193$8,313iApproximate average salary by contribution assumption: employee only about $207,832 at 4% or $138,555 at 6%; with 50% employer match about $138,555 at 4% or $92,370 at 6%; with 100% employer match about $103,916 at 4% or $69,277 at 6%.
201627$523,450$122,816$17,545iApproximate average salary by contribution assumption: employee only about $438,629 at 4% or $292,419 at 6%; with 50% employer match about $292,419 at 4% or $194,946 at 6%; with 100% employer match about $219,314 at 4% or $146,210 at 6%.
MARK J. SOKOLOWSKI, M.D., S.C. CASH BALANCE PLAN-5$339,111$78,964$15,793iApproximate average salary by contribution assumption: employee only about $394,820 at 4% or $263,213 at 6%; with 50% employer match about $263,213 at 4% or $175,476 at 6%; with 100% employer match about $197,410 at 4% or $131,607 at 6%.
Mark J. Sokolowski, MD Sc 401(K) Plan-7$184,339$43,852$6,265iApproximate average salary by contribution assumption: employee only about $156,614 at 4% or $104,410 at 6%; with 50% employer match about $104,410 at 4% or $69,606 at 6%; with 100% employer match about $78,307 at 4% or $52,205 at 6%.
201526$359,199$145,111$24,185iApproximate average salary by contribution assumption: employee only about $604,629 at 4% or $403,086 at 6%; with 50% employer match about $403,086 at 4% or $268,724 at 6%; with 100% employer match about $302,315 at 4% or $201,543 at 6%.
MARK J. SOKOLOWSKI, M.D., S.C. CASH BALANCE PLAN-2$237,101$89,397$44,699iApproximate average salary by contribution assumption: employee only about $1,117,463 at 4% or $744,975 at 6%; with 50% employer match about $744,975 at 4% or $496,650 at 6%; with 100% employer match about $558,731 at 4% or $372,488 at 6%.
Mark J. Sokolowski, MD Sc 401(K) Plan-6$122,098$55,714$9,286iApproximate average salary by contribution assumption: employee only about $232,142 at 4% or $154,761 at 6%; with 50% employer match about $154,761 at 4% or $103,174 at 6%; with 100% employer match about $116,071 at 4% or $77,381 at 6%.
201424$218,949$121,074$30,269iApproximate average salary by contribution assumption: employee only about $756,713 at 4% or $504,475 at 6%; with 50% employer match about $504,475 at 4% or $336,317 at 6%; with 100% employer match about $378,356 at 4% or $252,238 at 6%.
MARK J. SOKOLOWSKI, M.D., S.C. CASH BALANCE PLAN-3$152,616$69,202$23,067iApproximate average salary by contribution assumption: employee only about $576,683 at 4% or $384,456 at 6%; with 50% employer match about $384,456 at 4% or $256,304 at 6%; with 100% employer match about $288,342 at 4% or $192,228 at 6%.
Mark J. Sokolowski, MD Sc 401(K) Plan-4$66,333$51,872$12,968iApproximate average salary by contribution assumption: employee only about $324,200 at 4% or $216,133 at 6%; with 50% employer match about $216,133 at 4% or $144,089 at 6%; with 100% employer match about $162,100 at 4% or $108,067 at 6%.
201324$79,940$95,174$23,794iApproximate average salary by contribution assumption: employee only about $594,838 at 4% or $396,558 at 6%; with 50% employer match about $396,558 at 4% or $264,372 at 6%; with 100% employer match about $297,419 at 4% or $198,279 at 6%.
MARK J. SOKOLOWSKI, M.D., S.C. CASH BALANCE PLAN-4$73,974$73,974$18,494iApproximate average salary by contribution assumption: employee only about $462,338 at 4% or $308,225 at 6%; with 50% employer match about $308,225 at 4% or $205,483 at 6%; with 100% employer match about $231,169 at 4% or $154,113 at 6%.
Mark J. Sokolowski, MD Sc 401(K) Plan-4$5,966$21,200$5,300iApproximate average salary by contribution assumption: employee only about $132,500 at 4% or $88,333 at 6%; with 50% employer match about $88,333 at 4% or $58,889 at 6%; with 100% employer match about $66,250 at 4% or $44,167 at 6%.
Mark J. Sokolowski, MD Sc | EIN 26-3499165 | 2025 Form 5500 Company Profile