Civic Intelligence

The Middlesex Corporation

Plan context: The Middlesex Corporation Retirement Savings Plan

EIN 04-2534615 • Littleton, MA • 52 filings • 8 plans

One Spectacle Pond RoadLittleton, MA 01460
Current Snapshot

Latest Year

2024

2024 Participants

887

2024 Assets

$117,897,915

2024 Contributions

$17,024,817

Historical Graphs

Total Assets Over Time

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

$117,897,915$58,948,958$0200120132024YearValue
$117,897,915Latest year 2024

Participants Over Time

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

1,0095050199920122024YearValue
887Latest 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
20242887$117,897,915$17,024,817$19,194iApproximate average salary by contribution assumption: employee only about $479,843 at 4% or $319,895 at 6%; with 50% employer match about $319,895 at 4% or $213,263 at 6%; with 100% employer match about $239,921 at 4% or $159,948 at 6%.
The Middlesex Corporation Retirement Savings Plan-887$117,897,915$17,024,817$19,194iApproximate average salary by contribution assumption: employee only about $479,843 at 4% or $319,895 at 6%; with 50% employer match about $319,895 at 4% or $213,263 at 6%; with 100% employer match about $239,921 at 4% or $159,948 at 6%.
The Middlesex Corporation Health Benefit Plan-783---
20232810$102,656,093$12,445,347$15,365iApproximate average salary by contribution assumption: employee only about $384,116 at 4% or $256,077 at 6%; with 50% employer match about $256,077 at 4% or $170,718 at 6%; with 100% employer match about $192,058 at 4% or $128,039 at 6%.
The Middlesex Corporation Retirement Savings Plan-810$102,656,093$12,445,347$15,365iApproximate average salary by contribution assumption: employee only about $384,116 at 4% or $256,077 at 6%; with 50% employer match about $256,077 at 4% or $170,718 at 6%; with 100% employer match about $192,058 at 4% or $128,039 at 6%.
The Middlesex Corporation Health Benefit Plan-769---
20222903$86,944,368$12,208,552$13,520iApproximate average salary by contribution assumption: employee only about $338,000 at 4% or $225,333 at 6%; with 50% employer match about $225,333 at 4% or $150,222 at 6%; with 100% employer match about $169,000 at 4% or $112,667 at 6%.
The Middlesex Corporation Retirement Savings Plan-772$86,944,368$12,208,552$15,814iApproximate average salary by contribution assumption: employee only about $395,355 at 4% or $263,570 at 6%; with 50% employer match about $263,570 at 4% or $175,713 at 6%; with 100% employer match about $197,677 at 4% or $131,785 at 6%.
The Middlesex Corporation Health Benefit Plan-903---
20212903$108,974,174$14,890,537$16,490iApproximate average salary by contribution assumption: employee only about $412,252 at 4% or $274,835 at 6%; with 50% employer match about $274,835 at 4% or $183,223 at 6%; with 100% employer match about $206,126 at 4% or $137,417 at 6%.
The Middlesex Corporation Retirement Savings Plan-868$108,974,174$14,890,537$17,155iApproximate average salary by contribution assumption: employee only about $428,875 at 4% or $285,917 at 6%; with 50% employer match about $285,917 at 4% or $190,611 at 6%; with 100% employer match about $214,437 at 4% or $142,958 at 6%.
The Middlesex Corporation Health Benefit Plan-903---
20202957$95,696,183$16,350,077$17,085iApproximate average salary by contribution assumption: employee only about $427,118 at 4% or $284,745 at 6%; with 50% employer match about $284,745 at 4% or $189,830 at 6%; with 100% employer match about $213,559 at 4% or $142,373 at 6%.
The Middlesex Corporation Retirement Savings Plan-957$95,696,183$16,350,077$17,085iApproximate average salary by contribution assumption: employee only about $427,118 at 4% or $284,745 at 6%; with 50% employer match about $284,745 at 4% or $189,830 at 6%; with 100% employer match about $213,559 at 4% or $142,373 at 6%.
The Middlesex Corporation Health Benefit Plan-879---
201921,009$75,085,301$11,440,674$11,339iApproximate average salary by contribution assumption: employee only about $283,466 at 4% or $188,977 at 6%; with 50% employer match about $188,977 at 4% or $125,985 at 6%; with 100% employer match about $141,733 at 4% or $94,489 at 6%.
The Middlesex Corporation Retirement Savings Plan-1,009$75,085,301$11,440,674$11,339iApproximate average salary by contribution assumption: employee only about $283,466 at 4% or $188,977 at 6%; with 50% employer match about $188,977 at 4% or $125,985 at 6%; with 100% employer match about $141,733 at 4% or $94,489 at 6%.
The Middlesex Corporation Health Benefit Plan-963---
20182932$60,094,039$8,731,395$9,368iApproximate average salary by contribution assumption: employee only about $234,211 at 4% or $156,141 at 6%; with 50% employer match about $156,141 at 4% or $104,094 at 6%; with 100% employer match about $117,106 at 4% or $78,070 at 6%.
The Middlesex Corporation Retirement Savings Plan-932$60,094,039$8,731,395$9,368iApproximate average salary by contribution assumption: employee only about $234,211 at 4% or $156,141 at 6%; with 50% employer match about $156,141 at 4% or $104,094 at 6%; with 100% employer match about $117,106 at 4% or $78,070 at 6%.
The Middlesex Corporation Health Benefit Plan-444---
20172937$58,146,432$7,441,690$7,942iApproximate average salary by contribution assumption: employee only about $198,551 at 4% or $132,367 at 6%; with 50% employer match about $132,367 at 4% or $88,245 at 6%; with 100% employer match about $99,275 at 4% or $66,184 at 6%.
The Middlesex Corporation Retirement Savings Plan-934$58,146,432$7,441,690$7,968iApproximate average salary by contribution assumption: employee only about $199,189 at 4% or $132,792 at 6%; with 50% employer match about $132,792 at 4% or $88,528 at 6%; with 100% employer match about $99,594 at 4% or $66,396 at 6%.
The Middlesex Corporation Health Benefit Plan-937---
20162846$46,747,238$6,850,592$8,098iApproximate average salary by contribution assumption: employee only about $202,441 at 4% or $134,960 at 6%; with 50% employer match about $134,960 at 4% or $89,974 at 6%; with 100% employer match about $101,220 at 4% or $67,480 at 6%.
The Middlesex Corporation Retirement Savings Plan-846$46,747,238$6,850,592$8,098iApproximate average salary by contribution assumption: employee only about $202,441 at 4% or $134,960 at 6%; with 50% employer match about $134,960 at 4% or $89,974 at 6%; with 100% employer match about $101,220 at 4% or $67,480 at 6%.
The Middlesex Corporation Health Benefit Plan-788---
20152688$39,524,522$4,814,534$6,998iApproximate average salary by contribution assumption: employee only about $174,947 at 4% or $116,631 at 6%; with 50% employer match about $116,631 at 4% or $77,754 at 6%; with 100% employer match about $87,473 at 4% or $58,316 at 6%.
The Middlesex Corporation Retirement Savings Plan-688$39,524,522$4,814,534$6,998iApproximate average salary by contribution assumption: employee only about $174,947 at 4% or $116,631 at 6%; with 50% employer match about $116,631 at 4% or $77,754 at 6%; with 100% employer match about $87,473 at 4% or $58,316 at 6%.
The Middlesex Corporation Health Benefit Plan-406---
20142554$39,978,853$5,330,890$9,623iApproximate average salary by contribution assumption: employee only about $240,564 at 4% or $160,376 at 6%; with 50% employer match about $160,376 at 4% or $106,917 at 6%; with 100% employer match about $120,282 at 4% or $80,188 at 6%.
The Middlesex Corporation Retirement Savings Plan-554$39,978,853$5,330,890$9,623iApproximate average salary by contribution assumption: employee only about $240,564 at 4% or $160,376 at 6%; with 50% employer match about $160,376 at 4% or $106,917 at 6%; with 100% employer match about $120,282 at 4% or $80,188 at 6%.
The Middlesex Corporation Health Benefit Plan-306---
20132505$34,650,688$4,713,603$9,334iApproximate average salary by contribution assumption: employee only about $233,347 at 4% or $155,564 at 6%; with 50% employer match about $155,564 at 4% or $103,710 at 6%; with 100% employer match about $116,673 at 4% or $77,782 at 6%.
The Middlesex Corporation Retirement Savings Plan-505$34,650,688$4,713,603$9,334iApproximate average salary by contribution assumption: employee only about $233,347 at 4% or $155,564 at 6%; with 50% employer match about $155,564 at 4% or $103,710 at 6%; with 100% employer match about $116,673 at 4% or $77,782 at 6%.
The Middlesex Corporation Health Benefit Plan-445---
20122473$26,065,468$3,615,500$7,644iApproximate average salary by contribution assumption: employee only about $191,094 at 4% or $127,396 at 6%; with 50% employer match about $127,396 at 4% or $84,931 at 6%; with 100% employer match about $95,547 at 4% or $63,698 at 6%.
The Middlesex Corporation Retirement Savings Plan-473$26,065,468$3,615,500$7,644iApproximate average salary by contribution assumption: employee only about $191,094 at 4% or $127,396 at 6%; with 50% employer match about $127,396 at 4% or $84,931 at 6%; with 100% employer match about $95,547 at 4% or $63,698 at 6%.
The Middlesex Corporation Health Benefit Plan-432---
20113403$20,557,973$2,600,310$6,452iApproximate average salary by contribution assumption: employee only about $161,310 at 4% or $107,540 at 6%; with 50% employer match about $107,540 at 4% or $71,693 at 6%; with 100% employer match about $80,655 at 4% or $53,770 at 6%.
The Middlesex Corporation Retirement Savings Plan-403$20,557,973$2,600,310$6,452iApproximate average salary by contribution assumption: employee only about $161,310 at 4% or $107,540 at 6%; with 50% employer match about $107,540 at 4% or $71,693 at 6%; with 100% employer match about $80,655 at 4% or $53,770 at 6%.
The Middlesex Corporation Health Benefit Plan-366---
The Middlesex Corporation Health Benefit Plan-384---
20102342$19,130,804$2,519,747$7,368iApproximate average salary by contribution assumption: employee only about $184,192 at 4% or $122,795 at 6%; with 50% employer match about $122,795 at 4% or $81,863 at 6%; with 100% employer match about $92,096 at 4% or $61,397 at 6%.
The Middlesex Corporation Retirement Savings Plan-328$19,130,804$2,519,747$7,682iApproximate average salary by contribution assumption: employee only about $192,054 at 4% or $128,036 at 6%; with 50% employer match about $128,036 at 4% or $85,357 at 6%; with 100% employer match about $96,027 at 4% or $64,018 at 6%.
The Middlesex Corporation Health Benefit Plan-342---
20092315$15,141,582$1,884,712$5,983iApproximate average salary by contribution assumption: employee only about $149,580 at 4% or $99,720 at 6%; with 50% employer match about $99,720 at 4% or $66,480 at 6%; with 100% employer match about $74,790 at 4% or $49,860 at 6%.
The Middlesex Corporation Retirement Savings Plan-287$15,141,582$1,884,712$6,567iApproximate average salary by contribution assumption: employee only about $164,174 at 4% or $109,449 at 6%; with 50% employer match about $109,449 at 4% or $72,966 at 6%; with 100% employer match about $82,087 at 4% or $54,725 at 6%.
The Middlesex Corporation Health Benefit Plan-315---
20082526$11,104,430$1,732,518$3,294iApproximate average salary by contribution assumption: employee only about $82,344 at 4% or $54,896 at 6%; with 50% employer match about $54,896 at 4% or $36,597 at 6%; with 100% employer match about $41,172 at 4% or $27,448 at 6%.
The Middlesex Corporation Retirement Savings Plan-526$11,104,430$1,732,518$3,294iApproximate average salary by contribution assumption: employee only about $82,344 at 4% or $54,896 at 6%; with 50% employer match about $54,896 at 4% or $36,597 at 6%; with 100% employer match about $41,172 at 4% or $27,448 at 6%.
The Middlesex Corporation Health Benefit Plan-271---
20072659$15,147,532$1,844,196$2,798iApproximate average salary by contribution assumption: employee only about $69,962 at 4% or $46,641 at 6%; with 50% employer match about $46,641 at 4% or $31,094 at 6%; with 100% employer match about $34,981 at 4% or $23,321 at 6%.
The Middlesex Corporation Retirement Savings Plan-659$15,147,532$1,844,196$2,798iApproximate average salary by contribution assumption: employee only about $69,962 at 4% or $46,641 at 6%; with 50% employer match about $46,641 at 4% or $31,094 at 6%; with 100% employer match about $34,981 at 4% or $23,321 at 6%.
The Middlesex Corporation Health Benefit Plan-356---
20062766$14,227,369$2,087,627$2,725iApproximate average salary by contribution assumption: employee only about $68,134 at 4% or $45,423 at 6%; with 50% employer match about $45,423 at 4% or $30,282 at 6%; with 100% employer match about $34,067 at 4% or $22,711 at 6%.
The Middlesex Corporation Retirement Savings Plan-766$14,227,369$2,087,627$2,725iApproximate average salary by contribution assumption: employee only about $68,134 at 4% or $45,423 at 6%; with 50% employer match about $45,423 at 4% or $30,282 at 6%; with 100% employer match about $34,067 at 4% or $22,711 at 6%.
The Middlesex Corporation Health Benefit Plan-540---
20052524$12,262,829$1,705,110$3,254iApproximate average salary by contribution assumption: employee only about $81,351 at 4% or $54,234 at 6%; with 50% employer match about $54,234 at 4% or $36,156 at 6%; with 100% employer match about $40,675 at 4% or $27,117 at 6%.
The Middlesex Corporation Retirement Savings Plan-474$12,262,829$1,705,110$3,597iApproximate average salary by contribution assumption: employee only about $89,932 at 4% or $59,955 at 6%; with 50% employer match about $59,955 at 4% or $39,970 at 6%; with 100% employer match about $44,966 at 4% or $29,977 at 6%.
The Middlesex Corporation Health Benefit Plan-524---
20042473$10,674,958$1,682,874$3,558iApproximate average salary by contribution assumption: employee only about $88,947 at 4% or $59,298 at 6%; with 50% employer match about $59,298 at 4% or $39,532 at 6%; with 100% employer match about $44,473 at 4% or $29,649 at 6%.
The Middlesex Corporation Retirement Savings Plan-460$10,674,958$1,682,874$3,658iApproximate average salary by contribution assumption: employee only about $91,461 at 4% or $60,974 at 6%; with 50% employer match about $60,974 at 4% or $40,649 at 6%; with 100% employer match about $45,730 at 4% or $30,487 at 6%.
The Middlesex Corporation Health Benefit Plan-473---
20032462$8,897,665$1,994,922$4,318iApproximate average salary by contribution assumption: employee only about $107,950 at 4% or $71,967 at 6%; with 50% employer match about $71,967 at 4% or $47,978 at 6%; with 100% employer match about $53,975 at 4% or $35,983 at 6%.
The Middlesex Corporation Retirement Savings Plan-430$8,897,665$1,994,922$4,639iApproximate average salary by contribution assumption: employee only about $115,984 at 4% or $77,323 at 6%; with 50% employer match about $77,323 at 4% or $51,548 at 6%; with 100% employer match about $57,992 at 4% or $38,661 at 6%.
The Middlesex Corporation Health Benefit Plan-462---
20022334$6,170,178$1,549,759$4,640iApproximate average salary by contribution assumption: employee only about $116,000 at 4% or $77,333 at 6%; with 50% employer match about $77,333 at 4% or $51,556 at 6%; with 100% employer match about $58,000 at 4% or $38,667 at 6%.
The Middlesex Corporation Retirement Savings Plan-230$6,170,178$1,549,759$6,738iApproximate average salary by contribution assumption: employee only about $168,452 at 4% or $112,301 at 6%; with 50% employer match about $112,301 at 4% or $74,868 at 6%; with 100% employer match about $84,226 at 4% or $56,151 at 6%.
The Middlesex Corporation Health Benefit Plan-334---
20012417$6,566,429$1,469,124$3,523iApproximate average salary by contribution assumption: employee only about $88,077 at 4% or $58,718 at 6%; with 50% employer match about $58,718 at 4% or $39,145 at 6%; with 100% employer match about $44,038 at 4% or $29,359 at 6%.
The Middlesex Corporation Retirement Savings Plan-417$6,566,429$1,469,124$3,523iApproximate average salary by contribution assumption: employee only about $88,077 at 4% or $58,718 at 6%; with 50% employer match about $58,718 at 4% or $39,145 at 6%; with 100% employer match about $44,038 at 4% or $29,359 at 6%.
The Middlesex Corporation Health Benefit Plan-307---
20002396$0$0-
The Middlesex Corporation Health Benefit Plan-394---
The Middlesex Corporation Retirement Savings Plan-396---
19991423$0$0-
The Middlesex Corporation Health Benefit Plan-423---