Civic Intelligence

A123 Systems LLC

Plan context: A123 Systems LLC 401(K) Plan

EIN 35-2464405 • 25 filings • 5 plans

Current Snapshot

Latest Year

2025

2025 Participants

86

2025 Assets

$25,328,137

2025 Contributions

$1,578,698

Historical Graphs

Total Assets Over Time

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

$34,811,533$17,405,767$0201320192024YearValue
$25,328,137Latest year 2024

Participants Over Time

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

6623310201320192025YearValue
86Latest 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
2025186$0$0-
A123 Systems LLC Employee Benefits Plan-86---
20242110$25,328,137$1,578,698$14,352iApproximate average salary by contribution assumption: employee only about $358,795 at 4% or $239,197 at 6%; with 50% employer match about $239,197 at 4% or $159,464 at 6%; with 100% employer match about $179,398 at 4% or $119,598 at 6%.
A123 Systems LLC 401(K) Plan-105$25,328,137$1,578,698$15,035iApproximate average salary by contribution assumption: employee only about $375,880 at 4% or $250,587 at 6%; with 50% employer match about $250,587 at 4% or $167,058 at 6%; with 100% employer match about $187,940 at 4% or $125,293 at 6%.
A123 Systems LLC Employee Benefits Plan-110---
20232116$24,400,950$1,615,114$13,923iApproximate average salary by contribution assumption: employee only about $348,085 at 4% or $232,057 at 6%; with 50% employer match about $232,057 at 4% or $154,704 at 6%; with 100% employer match about $174,042 at 4% or $116,028 at 6%.
A123 Systems LLC 401(K) Plan-116$24,400,950$1,615,114$13,923iApproximate average salary by contribution assumption: employee only about $348,085 at 4% or $232,057 at 6%; with 50% employer match about $232,057 at 4% or $154,704 at 6%; with 100% employer match about $174,042 at 4% or $116,028 at 6%.
A123 Systems LLC Employee Benefits Plan-112---
20222119$23,177,147$1,637,482$13,760iApproximate average salary by contribution assumption: employee only about $344,009 at 4% or $229,339 at 6%; with 50% employer match about $229,339 at 4% or $152,893 at 6%; with 100% employer match about $172,004 at 4% or $114,670 at 6%.
A123 Systems LLC 401(K) Plan-116$23,177,147$1,637,482$14,116iApproximate average salary by contribution assumption: employee only about $352,906 at 4% or $235,270 at 6%; with 50% employer match about $235,270 at 4% or $156,847 at 6%; with 100% employer match about $176,453 at 4% or $117,635 at 6%.
A123 Systems LLC Employee Benefits Plan-119---
20212115$31,125,246$2,017,447$17,543iApproximate average salary by contribution assumption: employee only about $438,575 at 4% or $292,384 at 6%; with 50% employer match about $292,384 at 4% or $194,922 at 6%; with 100% employer match about $219,288 at 4% or $146,192 at 6%.
A123 Systems LLC 401(K) Plan-114$31,125,246$2,017,447$17,697iApproximate average salary by contribution assumption: employee only about $442,423 at 4% or $294,948 at 6%; with 50% employer match about $294,948 at 4% or $196,632 at 6%; with 100% employer match about $221,211 at 4% or $147,474 at 6%.
A123 Systems LLC Employee Benefits Plan-115---
20202191$34,811,533$4,420,575$23,144iApproximate average salary by contribution assumption: employee only about $578,609 at 4% or $385,740 at 6%; with 50% employer match about $385,740 at 4% or $257,160 at 6%; with 100% employer match about $289,305 at 4% or $192,870 at 6%.
A123 Systems LLC 401(K) Plan-191$34,811,533$4,420,575$23,144iApproximate average salary by contribution assumption: employee only about $578,609 at 4% or $385,740 at 6%; with 50% employer match about $385,740 at 4% or $257,160 at 6%; with 100% employer match about $289,305 at 4% or $192,870 at 6%.
A123 Systems LLC Employee Benefits Plan-187---
20192453$34,076,002$7,459,621$16,467iApproximate average salary by contribution assumption: employee only about $411,679 at 4% or $274,453 at 6%; with 50% employer match about $274,453 at 4% or $182,968 at 6%; with 100% employer match about $205,839 at 4% or $137,226 at 6%.
A123 Systems LLC 401(K) Plan-453$34,076,002$7,459,621$16,467iApproximate average salary by contribution assumption: employee only about $411,679 at 4% or $274,453 at 6%; with 50% employer match about $274,453 at 4% or $182,968 at 6%; with 100% employer match about $205,839 at 4% or $137,226 at 6%.
A123 Systems LLC Employee Benefits Plan-443---
20182450$23,658,889$6,102,738$13,562iApproximate average salary by contribution assumption: employee only about $339,041 at 4% or $226,027 at 6%; with 50% employer match about $226,027 at 4% or $150,685 at 6%; with 100% employer match about $169,521 at 4% or $113,014 at 6%.
A123 Systems LLC 401(K) Plan-450$23,658,889$6,102,738$13,562iApproximate average salary by contribution assumption: employee only about $339,041 at 4% or $226,027 at 6%; with 50% employer match about $226,027 at 4% or $150,685 at 6%; with 100% employer match about $169,521 at 4% or $113,014 at 6%.
A123 Systems LLC Employee Benefits Plan-437---
20172566$24,001,684$5,214,681$9,213iApproximate average salary by contribution assumption: employee only about $230,330 at 4% or $153,554 at 6%; with 50% employer match about $153,554 at 4% or $102,369 at 6%; with 100% employer match about $115,165 at 4% or $76,777 at 6%.
A123 Systems LLC 401(K) Plan-566$24,001,684$5,214,681$9,213iApproximate average salary by contribution assumption: employee only about $230,330 at 4% or $153,554 at 6%; with 50% employer match about $153,554 at 4% or $102,369 at 6%; with 100% employer match about $115,165 at 4% or $76,777 at 6%.
A123 Systems LLC Employee Benefits Plan-412---
20162530$18,583,544$5,611,961$10,589iApproximate average salary by contribution assumption: employee only about $264,715 at 4% or $176,477 at 6%; with 50% employer match about $176,477 at 4% or $117,651 at 6%; with 100% employer match about $132,358 at 4% or $88,238 at 6%.
A123 Systems LLC 401(K) Plan-530$18,583,544$5,611,961$10,589iApproximate average salary by contribution assumption: employee only about $264,715 at 4% or $176,477 at 6%; with 50% employer match about $176,477 at 4% or $117,651 at 6%; with 100% employer match about $132,358 at 4% or $88,238 at 6%.
A123 Systems LLC Employee Benefits Plan-514---
20152490$13,002,940$3,037,073$6,198iApproximate average salary by contribution assumption: employee only about $154,953 at 4% or $103,302 at 6%; with 50% employer match about $103,302 at 4% or $68,868 at 6%; with 100% employer match about $77,476 at 4% or $51,651 at 6%.
A123 Systems LLC 401(K) Plan-490$13,002,940$3,037,073$6,198iApproximate average salary by contribution assumption: employee only about $154,953 at 4% or $103,302 at 6%; with 50% employer match about $103,302 at 4% or $68,868 at 6%; with 100% employer match about $77,476 at 4% or $51,651 at 6%.
A123 Systems LLC Employee Benefits Plan-409---
20142469$11,319,220$3,268,252$6,969iApproximate average salary by contribution assumption: employee only about $174,214 at 4% or $116,143 at 6%; with 50% employer match about $116,143 at 4% or $77,428 at 6%; with 100% employer match about $87,107 at 4% or $58,071 at 6%.
A123 Systems LLC 401(K) Plan-469$11,319,220$3,268,252$6,969iApproximate average salary by contribution assumption: employee only about $174,214 at 4% or $116,143 at 6%; with 50% employer match about $116,143 at 4% or $77,428 at 6%; with 100% employer match about $87,107 at 4% or $58,071 at 6%.
A123 Systems LLC Employee Benefits Plan-458---
20132662$9,895,115$10,102,662$15,261iApproximate average salary by contribution assumption: employee only about $381,520 at 4% or $254,347 at 6%; with 50% employer match about $254,347 at 4% or $169,565 at 6%; with 100% employer match about $190,760 at 4% or $127,173 at 6%.
A123 Systems LLC 401(K) Plan-662$9,895,115$10,102,662$15,261iApproximate average salary by contribution assumption: employee only about $381,520 at 4% or $254,347 at 6%; with 50% employer match about $254,347 at 4% or $169,565 at 6%; with 100% employer match about $190,760 at 4% or $127,173 at 6%.
A123 Systems LLC Employee Benefits Plan-463---