Civic Intelligence

Childrens Oncology Services Of

Plan context: Children'S Oncology Services of Massachusetts, D/B/A the Boston

EIN 04-2627411 • Brookline, MA • 22 filings • 4 plans

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229 Kent StreetBrookline, MA 02466
Current Snapshot

Latest Year

2025

2025 Participants

5

2025 Assets

$632,401

2025 Contributions

$52,727

Historical Graphs

Total Assets Over Time

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

$1,178,193$589,097$0200220152025YearValue
$632,401Latest year 2025

Participants Over Time

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

1050200220152025YearValue
5Latest 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
202515$632,401$52,727$10,545iApproximate average salary by contribution assumption: employee only about $263,635 at 4% or $175,757 at 6%; with 50% employer match about $175,757 at 4% or $117,171 at 6%; with 100% employer match about $131,818 at 4% or $87,878 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-5$632,401$52,727$10,545iApproximate average salary by contribution assumption: employee only about $263,635 at 4% or $175,757 at 6%; with 50% employer match about $175,757 at 4% or $117,171 at 6%; with 100% employer match about $131,818 at 4% or $87,878 at 6%.
202412$495,037$51,052$25,526iApproximate average salary by contribution assumption: employee only about $638,150 at 4% or $425,433 at 6%; with 50% employer match about $425,433 at 4% or $283,622 at 6%; with 100% employer match about $319,075 at 4% or $212,717 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-2$495,037$51,052$25,526iApproximate average salary by contribution assumption: employee only about $638,150 at 4% or $425,433 at 6%; with 50% employer match about $425,433 at 4% or $283,622 at 6%; with 100% employer match about $319,075 at 4% or $212,717 at 6%.
202315$1,178,193$79,257$15,851iApproximate average salary by contribution assumption: employee only about $396,285 at 4% or $264,190 at 6%; with 50% employer match about $264,190 at 4% or $176,127 at 6%; with 100% employer match about $198,143 at 4% or $132,095 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-5$1,178,193$79,257$15,851iApproximate average salary by contribution assumption: employee only about $396,285 at 4% or $264,190 at 6%; with 50% employer match about $264,190 at 4% or $176,127 at 6%; with 100% employer match about $198,143 at 4% or $132,095 at 6%.
202215$964,910$82,261$16,452iApproximate average salary by contribution assumption: employee only about $411,305 at 4% or $274,203 at 6%; with 50% employer match about $274,203 at 4% or $182,802 at 6%; with 100% employer match about $205,653 at 4% or $137,102 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-5$964,910$82,261$16,452iApproximate average salary by contribution assumption: employee only about $411,305 at 4% or $274,203 at 6%; with 50% employer match about $274,203 at 4% or $182,802 at 6%; with 100% employer match about $205,653 at 4% or $137,102 at 6%.
202115$1,056,078$66,507$13,301iApproximate average salary by contribution assumption: employee only about $332,535 at 4% or $221,690 at 6%; with 50% employer match about $221,690 at 4% or $147,793 at 6%; with 100% employer match about $166,268 at 4% or $110,845 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-5$1,056,078$66,507$13,301iApproximate average salary by contribution assumption: employee only about $332,535 at 4% or $221,690 at 6%; with 50% employer match about $221,690 at 4% or $147,793 at 6%; with 100% employer match about $166,268 at 4% or $110,845 at 6%.
202015$902,392$47,008$9,402iApproximate average salary by contribution assumption: employee only about $235,040 at 4% or $156,693 at 6%; with 50% employer match about $156,693 at 4% or $104,462 at 6%; with 100% employer match about $117,520 at 4% or $78,347 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-5$902,392$47,008$9,402iApproximate average salary by contribution assumption: employee only about $235,040 at 4% or $156,693 at 6%; with 50% employer match about $156,693 at 4% or $104,462 at 6%; with 100% employer match about $117,520 at 4% or $78,347 at 6%.
201916$761,560$44,677$7,446iApproximate average salary by contribution assumption: employee only about $186,154 at 4% or $124,103 at 6%; with 50% employer match about $124,103 at 4% or $82,735 at 6%; with 100% employer match about $93,077 at 4% or $62,051 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-6$761,560$44,677$7,446iApproximate average salary by contribution assumption: employee only about $186,154 at 4% or $124,103 at 6%; with 50% employer match about $124,103 at 4% or $82,735 at 6%; with 100% employer match about $93,077 at 4% or $62,051 at 6%.
201815$592,642$47,587$9,517iApproximate average salary by contribution assumption: employee only about $237,935 at 4% or $158,623 at 6%; with 50% employer match about $158,623 at 4% or $105,749 at 6%; with 100% employer match about $118,968 at 4% or $79,312 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-5$592,642$47,587$9,517iApproximate average salary by contribution assumption: employee only about $237,935 at 4% or $158,623 at 6%; with 50% employer match about $158,623 at 4% or $105,749 at 6%; with 100% employer match about $118,968 at 4% or $79,312 at 6%.
201716$642,669$51,964$8,661iApproximate average salary by contribution assumption: employee only about $216,517 at 4% or $144,344 at 6%; with 50% employer match about $144,344 at 4% or $96,230 at 6%; with 100% employer match about $108,258 at 4% or $72,172 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-6$642,669$51,964$8,661iApproximate average salary by contribution assumption: employee only about $216,517 at 4% or $144,344 at 6%; with 50% employer match about $144,344 at 4% or $96,230 at 6%; with 100% employer match about $108,258 at 4% or $72,172 at 6%.
201615$510,154$52,090$10,418iApproximate average salary by contribution assumption: employee only about $260,450 at 4% or $173,633 at 6%; with 50% employer match about $173,633 at 4% or $115,756 at 6%; with 100% employer match about $130,225 at 4% or $86,817 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-5$510,154$52,090$10,418iApproximate average salary by contribution assumption: employee only about $260,450 at 4% or $173,633 at 6%; with 50% employer match about $173,633 at 4% or $115,756 at 6%; with 100% employer match about $130,225 at 4% or $86,817 at 6%.
201515$433,343$36,223$7,245iApproximate average salary by contribution assumption: employee only about $181,115 at 4% or $120,743 at 6%; with 50% employer match about $120,743 at 4% or $80,496 at 6%; with 100% employer match about $90,558 at 4% or $60,372 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-5$433,343$36,223$7,245iApproximate average salary by contribution assumption: employee only about $181,115 at 4% or $120,743 at 6%; with 50% employer match about $120,743 at 4% or $80,496 at 6%; with 100% employer match about $90,558 at 4% or $60,372 at 6%.
201415$405,597$47,824$9,565iApproximate average salary by contribution assumption: employee only about $239,120 at 4% or $159,413 at 6%; with 50% employer match about $159,413 at 4% or $106,276 at 6%; with 100% employer match about $119,560 at 4% or $79,707 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-5$405,597$47,824$9,565iApproximate average salary by contribution assumption: employee only about $239,120 at 4% or $159,413 at 6%; with 50% employer match about $159,413 at 4% or $106,276 at 6%; with 100% employer match about $119,560 at 4% or $79,707 at 6%.
201314$338,706$43,300$10,825iApproximate average salary by contribution assumption: employee only about $270,625 at 4% or $180,417 at 6%; with 50% employer match about $180,417 at 4% or $120,278 at 6%; with 100% employer match about $135,313 at 4% or $90,208 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-4$338,706$43,300$10,825iApproximate average salary by contribution assumption: employee only about $270,625 at 4% or $180,417 at 6%; with 50% employer match about $180,417 at 4% or $120,278 at 6%; with 100% employer match about $135,313 at 4% or $90,208 at 6%.
201214$253,041$49,965$12,491iApproximate average salary by contribution assumption: employee only about $312,281 at 4% or $208,188 at 6%; with 50% employer match about $208,188 at 4% or $138,792 at 6%; with 100% employer match about $156,141 at 4% or $104,094 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-4$253,041$49,965$12,491iApproximate average salary by contribution assumption: employee only about $312,281 at 4% or $208,188 at 6%; with 50% employer match about $208,188 at 4% or $138,792 at 6%; with 100% employer match about $156,141 at 4% or $104,094 at 6%.
201119$289,896$37,115$4,124iApproximate average salary by contribution assumption: employee only about $103,097 at 4% or $68,731 at 6%; with 50% employer match about $68,731 at 4% or $45,821 at 6%; with 100% employer match about $51,549 at 4% or $34,366 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-9$289,896$37,115$4,124iApproximate average salary by contribution assumption: employee only about $103,097 at 4% or $68,731 at 6%; with 50% employer match about $68,731 at 4% or $45,821 at 6%; with 100% employer match about $51,549 at 4% or $34,366 at 6%.
201019$253,790$23,728$2,636iApproximate average salary by contribution assumption: employee only about $65,911 at 4% or $43,941 at 6%; with 50% employer match about $43,941 at 4% or $29,294 at 6%; with 100% employer match about $32,956 at 4% or $21,970 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-9$253,790$23,728$2,636iApproximate average salary by contribution assumption: employee only about $65,911 at 4% or $43,941 at 6%; with 50% employer match about $43,941 at 4% or $29,294 at 6%; with 100% employer match about $32,956 at 4% or $21,970 at 6%.
2009110$208,710$40,664$4,066iApproximate average salary by contribution assumption: employee only about $101,660 at 4% or $67,773 at 6%; with 50% employer match about $67,773 at 4% or $45,182 at 6%; with 100% employer match about $50,830 at 4% or $33,887 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-10$208,710$40,664$4,066iApproximate average salary by contribution assumption: employee only about $101,660 at 4% or $67,773 at 6%; with 50% employer match about $67,773 at 4% or $45,182 at 6%; with 100% employer match about $50,830 at 4% or $33,887 at 6%.
2008110$138,783$23,744$2,374iApproximate average salary by contribution assumption: employee only about $59,360 at 4% or $39,573 at 6%; with 50% employer match about $39,573 at 4% or $26,382 at 6%; with 100% employer match about $29,680 at 4% or $19,787 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-10$138,783$23,744$2,374iApproximate average salary by contribution assumption: employee only about $59,360 at 4% or $39,573 at 6%; with 50% employer match about $39,573 at 4% or $26,382 at 6%; with 100% employer match about $29,680 at 4% or $19,787 at 6%.
200619$135,655$27,670$3,074iApproximate average salary by contribution assumption: employee only about $76,861 at 4% or $51,241 at 6%; with 50% employer match about $51,241 at 4% or $34,160 at 6%; with 100% employer match about $38,431 at 4% or $25,620 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-9$135,655$27,670$3,074iApproximate average salary by contribution assumption: employee only about $76,861 at 4% or $51,241 at 6%; with 50% employer match about $51,241 at 4% or $34,160 at 6%; with 100% employer match about $38,431 at 4% or $25,620 at 6%.
200418$79,237$28,215$3,527iApproximate average salary by contribution assumption: employee only about $88,172 at 4% or $58,781 at 6%; with 50% employer match about $58,781 at 4% or $39,188 at 6%; with 100% employer match about $44,086 at 4% or $29,391 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-8$79,237$28,215$3,527iApproximate average salary by contribution assumption: employee only about $88,172 at 4% or $58,781 at 6%; with 50% employer match about $58,781 at 4% or $39,188 at 6%; with 100% employer match about $44,086 at 4% or $29,391 at 6%.
200316$0$0-
Children'S Oncology Services of Massachusetts, D/B/A the Boston-6---
200216$7,533$7,471$1,245iApproximate average salary by contribution assumption: employee only about $31,129 at 4% or $20,753 at 6%; with 50% employer match about $20,753 at 4% or $13,835 at 6%; with 100% employer match about $15,565 at 4% or $10,376 at 6%.
Children'S Oncology Services of Massachusetts, D/B/A the Boston-6$7,533$7,471$1,245iApproximate average salary by contribution assumption: employee only about $31,129 at 4% or $20,753 at 6%; with 50% employer match about $20,753 at 4% or $13,835 at 6%; with 100% employer match about $15,565 at 4% or $10,376 at 6%.