Civic Intelligence

One Source Engineering Inc.

Plan context: ONE SOURCE ENGINEERING 401(K) PLAN

EIN 86-1091953 • Atherton, CA • 40 filings • 5 plans

52 Laburnum RoadAtherton, CA 94027
Current Snapshot

Latest Year

2025

2025 Participants

7

2025 Assets

$9,454,043

2025 Contributions

$216,988

Historical Graphs

Total Assets Over Time

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

$9,454,043$4,727,022$0200420152025YearValue
$9,454,043Latest year 2025

Participants Over Time

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

950200420152025YearValue
7Latest 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
202517$9,454,043$216,988$30,998iApproximate average salary by contribution assumption: employee only about $774,957 at 4% or $516,638 at 6%; with 50% employer match about $516,638 at 4% or $344,425 at 6%; with 100% employer match about $387,479 at 4% or $258,319 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-7$9,454,043$216,988$30,998iApproximate average salary by contribution assumption: employee only about $774,957 at 4% or $516,638 at 6%; with 50% employer match about $516,638 at 4% or $344,425 at 6%; with 100% employer match about $387,479 at 4% or $258,319 at 6%.
202427$8,230,202$209,996$29,999iApproximate average salary by contribution assumption: employee only about $749,986 at 4% or $499,990 at 6%; with 50% employer match about $499,990 at 4% or $333,327 at 6%; with 100% employer match about $374,993 at 4% or $249,995 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-7$8,230,202$209,996$29,999iApproximate average salary by contribution assumption: employee only about $749,986 at 4% or $499,990 at 6%; with 50% employer match about $499,990 at 4% or $333,327 at 6%; with 100% employer match about $374,993 at 4% or $249,995 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-0$0$0-
202326$7,170,285$178,516$29,753iApproximate average salary by contribution assumption: employee only about $743,817 at 4% or $495,878 at 6%; with 50% employer match about $495,878 at 4% or $330,585 at 6%; with 100% employer match about $371,908 at 4% or $247,939 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-6$7,170,229$178,516$29,753iApproximate average salary by contribution assumption: employee only about $743,817 at 4% or $495,878 at 6%; with 50% employer match about $495,878 at 4% or $330,585 at 6%; with 100% employer match about $371,908 at 4% or $247,939 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-1$56$0-
202228$6,153,225$464,149$58,019iApproximate average salary by contribution assumption: employee only about $1,450,466 at 4% or $966,977 at 6%; with 50% employer match about $966,977 at 4% or $644,651 at 6%; with 100% employer match about $725,233 at 4% or $483,489 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-8$6,152,844$464,149$58,019iApproximate average salary by contribution assumption: employee only about $1,450,466 at 4% or $966,977 at 6%; with 50% employer match about $966,977 at 4% or $644,651 at 6%; with 100% employer match about $725,233 at 4% or $483,489 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-0$381$0-
202128$7,262,021$4,922,430$615,304iApproximate average salary by contribution assumption: employee only about $15,382,594 at 4% or $10,255,063 at 6%; with 50% employer match about $10,255,063 at 4% or $6,836,708 at 6%; with 100% employer match about $7,691,297 at 4% or $5,127,531 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-8$6,941,803$4,914,925$614,366iApproximate average salary by contribution assumption: employee only about $15,359,141 at 4% or $10,239,427 at 6%; with 50% employer match about $10,239,427 at 4% or $6,826,285 at 6%; with 100% employer match about $7,679,570 at 4% or $5,119,714 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-7$320,218$7,505$1,072iApproximate average salary by contribution assumption: employee only about $26,804 at 4% or $17,869 at 6%; with 50% employer match about $17,869 at 4% or $11,913 at 6%; with 100% employer match about $13,402 at 4% or $8,935 at 6%.
202029$6,731,445$157,724$17,525iApproximate average salary by contribution assumption: employee only about $438,122 at 4% or $292,081 at 6%; with 50% employer match about $292,081 at 4% or $194,721 at 6%; with 100% employer match about $219,061 at 4% or $146,041 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-7$4,814,041$0-
ONE SOURCE ENGINEERING 401(K) PLAN-9$1,917,404$157,724$17,525iApproximate average salary by contribution assumption: employee only about $438,122 at 4% or $292,081 at 6%; with 50% employer match about $292,081 at 4% or $194,721 at 6%; with 100% employer match about $219,061 at 4% or $146,041 at 6%.
201928$5,726,932$148,649$18,581iApproximate average salary by contribution assumption: employee only about $464,528 at 4% or $309,685 at 6%; with 50% employer match about $309,685 at 4% or $206,457 at 6%; with 100% employer match about $232,264 at 4% or $154,843 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-7$4,189,103$0-
ONE SOURCE ENGINEERING 401(K) PLAN-8$1,537,829$148,649$18,581iApproximate average salary by contribution assumption: employee only about $464,528 at 4% or $309,685 at 6%; with 50% employer match about $309,685 at 4% or $206,457 at 6%; with 100% employer match about $232,264 at 4% or $154,843 at 6%.
201828$4,692,620$182,449$22,806iApproximate average salary by contribution assumption: employee only about $570,153 at 4% or $380,102 at 6%; with 50% employer match about $380,102 at 4% or $253,401 at 6%; with 100% employer match about $285,077 at 4% or $190,051 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-7$3,509,289$34,000$4,857iApproximate average salary by contribution assumption: employee only about $121,429 at 4% or $80,952 at 6%; with 50% employer match about $80,952 at 4% or $53,968 at 6%; with 100% employer match about $60,714 at 4% or $40,476 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-8$1,183,331$148,449$18,556iApproximate average salary by contribution assumption: employee only about $463,903 at 4% or $309,269 at 6%; with 50% employer match about $309,269 at 4% or $206,179 at 6%; with 100% employer match about $231,952 at 4% or $154,634 at 6%.
201728$4,864,824$349,381$43,673iApproximate average salary by contribution assumption: employee only about $1,091,816 at 4% or $727,877 at 6%; with 50% employer match about $727,877 at 4% or $485,251 at 6%; with 100% employer match about $545,908 at 4% or $363,939 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-7$3,749,589$255,000$36,429iApproximate average salary by contribution assumption: employee only about $910,714 at 4% or $607,143 at 6%; with 50% employer match about $607,143 at 4% or $404,762 at 6%; with 100% employer match about $455,357 at 4% or $303,571 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-8$1,115,235$94,381$11,798iApproximate average salary by contribution assumption: employee only about $294,941 at 4% or $196,627 at 6%; with 50% employer match about $196,627 at 4% or $131,085 at 6%; with 100% employer match about $147,470 at 4% or $98,314 at 6%.
201628$3,893,252$346,686$43,336iApproximate average salary by contribution assumption: employee only about $1,083,394 at 4% or $722,263 at 6%; with 50% employer match about $722,263 at 4% or $481,508 at 6%; with 100% employer match about $541,697 at 4% or $361,131 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-7$3,017,157$260,000$37,143iApproximate average salary by contribution assumption: employee only about $928,571 at 4% or $619,048 at 6%; with 50% employer match about $619,048 at 4% or $412,698 at 6%; with 100% employer match about $464,286 at 4% or $309,524 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-8$876,095$86,686$10,836iApproximate average salary by contribution assumption: employee only about $270,894 at 4% or $180,596 at 6%; with 50% employer match about $180,596 at 4% or $120,397 at 6%; with 100% employer match about $135,447 at 4% or $90,298 at 6%.
201527$3,475,312$452,482$64,640iApproximate average salary by contribution assumption: employee only about $1,616,007 at 4% or $1,077,338 at 6%; with 50% employer match about $1,077,338 at 4% or $718,225 at 6%; with 100% employer match about $808,004 at 4% or $538,669 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-6$2,708,870$375,000$62,500iApproximate average salary by contribution assumption: employee only about $1,562,500 at 4% or $1,041,667 at 6%; with 50% employer match about $1,041,667 at 4% or $694,444 at 6%; with 100% employer match about $781,250 at 4% or $520,833 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-7$766,442$77,482$11,069iApproximate average salary by contribution assumption: employee only about $276,721 at 4% or $184,481 at 6%; with 50% employer match about $184,481 at 4% or $122,987 at 6%; with 100% employer match about $138,361 at 4% or $92,240 at 6%.
201426$3,143,068$259,125$43,188iApproximate average salary by contribution assumption: employee only about $1,079,688 at 4% or $719,792 at 6%; with 50% employer match about $719,792 at 4% or $479,861 at 6%; with 100% employer match about $539,844 at 4% or $359,896 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-6$2,423,058$200,000$33,333iApproximate average salary by contribution assumption: employee only about $833,333 at 4% or $555,556 at 6%; with 50% employer match about $555,556 at 4% or $370,370 at 6%; with 100% employer match about $416,667 at 4% or $277,778 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-6$720,010$59,125$9,854iApproximate average salary by contribution assumption: employee only about $246,354 at 4% or $164,236 at 6%; with 50% employer match about $164,236 at 4% or $109,491 at 6%; with 100% employer match about $123,177 at 4% or $82,118 at 6%.
201326$2,792,807$58,205$9,701iApproximate average salary by contribution assumption: employee only about $242,521 at 4% or $161,681 at 6%; with 50% employer match about $161,681 at 4% or $107,787 at 6%; with 100% employer match about $121,260 at 4% or $80,840 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-6$2,163,603$0-
ONE SOURCE ENGINEERING 401(K) PLAN-6$629,204$58,205$9,701iApproximate average salary by contribution assumption: employee only about $242,521 at 4% or $161,681 at 6%; with 50% employer match about $161,681 at 4% or $107,787 at 6%; with 100% employer match about $121,260 at 4% or $80,840 at 6%.
201226$2,488,455$436,372$72,729iApproximate average salary by contribution assumption: employee only about $1,818,217 at 4% or $1,212,144 at 6%; with 50% employer match about $1,212,144 at 4% or $808,096 at 6%; with 100% employer match about $909,108 at 4% or $606,072 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-6$1,999,819$365,000$60,833iApproximate average salary by contribution assumption: employee only about $1,520,833 at 4% or $1,013,889 at 6%; with 50% employer match about $1,013,889 at 4% or $675,926 at 6%; with 100% employer match about $760,417 at 4% or $506,944 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-6$488,636$71,372$11,895iApproximate average salary by contribution assumption: employee only about $297,383 at 4% or $198,256 at 6%; with 50% employer match about $198,256 at 4% or $132,170 at 6%; with 100% employer match about $148,692 at 4% or $99,128 at 6%.
201126$2,014,961$379,334$63,222iApproximate average salary by contribution assumption: employee only about $1,580,558 at 4% or $1,053,706 at 6%; with 50% employer match about $1,053,706 at 4% or $702,470 at 6%; with 100% employer match about $790,279 at 4% or $526,853 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-5$1,627,151$310,000$62,000iApproximate average salary by contribution assumption: employee only about $1,550,000 at 4% or $1,033,333 at 6%; with 50% employer match about $1,033,333 at 4% or $688,889 at 6%; with 100% employer match about $775,000 at 4% or $516,667 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-6$387,810$69,334$11,556iApproximate average salary by contribution assumption: employee only about $288,892 at 4% or $192,594 at 6%; with 50% employer match about $192,594 at 4% or $128,396 at 6%; with 100% employer match about $144,446 at 4% or $96,297 at 6%.
201025$1,638,820$140,401$28,080iApproximate average salary by contribution assumption: employee only about $702,005 at 4% or $468,003 at 6%; with 50% employer match about $468,003 at 4% or $312,002 at 6%; with 100% employer match about $351,003 at 4% or $234,002 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-3$1,316,979$28,000$9,333iApproximate average salary by contribution assumption: employee only about $233,333 at 4% or $155,556 at 6%; with 50% employer match about $155,556 at 4% or $103,704 at 6%; with 100% employer match about $116,667 at 4% or $77,778 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-5$321,841$112,401$22,480iApproximate average salary by contribution assumption: employee only about $562,005 at 4% or $374,670 at 6%; with 50% employer match about $374,670 at 4% or $249,780 at 6%; with 100% employer match about $281,003 at 4% or $187,335 at 6%.
200925$1,472,411$107,500$21,500iApproximate average salary by contribution assumption: employee only about $537,500 at 4% or $358,333 at 6%; with 50% employer match about $358,333 at 4% or $238,889 at 6%; with 100% employer match about $268,750 at 4% or $179,167 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-3$1,288,268$50,974$16,991iApproximate average salary by contribution assumption: employee only about $424,783 at 4% or $283,189 at 6%; with 50% employer match about $283,189 at 4% or $188,793 at 6%; with 100% employer match about $212,392 at 4% or $141,594 at 6%.
ONE SOURCE ENGINEERING 401(K) PLAN-5$184,143$56,526$11,305iApproximate average salary by contribution assumption: employee only about $282,630 at 4% or $188,420 at 6%; with 50% employer match about $188,420 at 4% or $125,613 at 6%; with 100% employer match about $141,315 at 4% or $94,210 at 6%.
200825$1,335,082$373,908$74,782iApproximate average salary by contribution assumption: employee only about $1,869,540 at 4% or $1,246,360 at 6%; with 50% employer match about $1,246,360 at 4% or $830,907 at 6%; with 100% employer match about $934,770 at 4% or $623,180 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-3$1,231,600$319,910$106,637iApproximate average salary by contribution assumption: employee only about $2,665,917 at 4% or $1,777,278 at 6%; with 50% employer match about $1,777,278 at 4% or $1,184,852 at 6%; with 100% employer match about $1,332,958 at 4% or $888,639 at 6%.
ONE SOURCE ENGINEERING 401K PLAN-5$103,482$53,998$10,800iApproximate average salary by contribution assumption: employee only about $269,990 at 4% or $179,993 at 6%; with 50% employer match about $179,993 at 4% or $119,996 at 6%; with 100% employer match about $134,995 at 4% or $89,997 at 6%.
200724$0$0-
ONE SOURCE ENGINEERING 401K PLAN-4---
One Source Engineering Inc. Defined Benefit Plan and Trust-3---
200613$613,200$182,743$60,914iApproximate average salary by contribution assumption: employee only about $1,522,858 at 4% or $1,015,239 at 6%; with 50% employer match about $1,015,239 at 4% or $676,826 at 6%; with 100% employer match about $761,429 at 4% or $507,619 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-3$613,200$182,743$60,914iApproximate average salary by contribution assumption: employee only about $1,522,858 at 4% or $1,015,239 at 6%; with 50% employer match about $1,015,239 at 4% or $676,826 at 6%; with 100% employer match about $761,429 at 4% or $507,619 at 6%.
200512$422,976$170,505$85,253iApproximate average salary by contribution assumption: employee only about $2,131,313 at 4% or $1,420,875 at 6%; with 50% employer match about $1,420,875 at 4% or $947,250 at 6%; with 100% employer match about $1,065,656 at 4% or $710,438 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-2$422,976$170,505$85,253iApproximate average salary by contribution assumption: employee only about $2,131,313 at 4% or $1,420,875 at 6%; with 50% employer match about $1,420,875 at 4% or $947,250 at 6%; with 100% employer match about $1,065,656 at 4% or $710,438 at 6%.
200412$250,216$132,629$66,315iApproximate average salary by contribution assumption: employee only about $1,657,863 at 4% or $1,105,242 at 6%; with 50% employer match about $1,105,242 at 4% or $736,828 at 6%; with 100% employer match about $828,931 at 4% or $552,621 at 6%.
One Source Engineering Inc. Defined Benefit Plan and Trust-2$250,216$132,629$66,315iApproximate average salary by contribution assumption: employee only about $1,657,863 at 4% or $1,105,242 at 6%; with 50% employer match about $1,105,242 at 4% or $736,828 at 6%; with 100% employer match about $828,931 at 4% or $552,621 at 6%.