Civic Intelligence

Peter H. Mattson & Co. Inc

Plan context: Mattson & Co. 401(K) Savings Plan

EIN 94-2456738 • Foster City, CA • 58 filings • 8 plans

343 Hatch DriveFoster City, CA 94404
Current Snapshot

Latest Year

2024

2024 Participants

63

2024 Assets

$38,667,301

2024 Contributions

$1,634,949

Historical Graphs

Total Assets Over Time

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

$38,667,301$19,333,651$0200020132024YearValue
$38,667,301Latest year 2024

Participants Over Time

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

72360200020122024YearValue
63Latest 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
2024263$38,667,301$1,634,949$25,952iApproximate average salary by contribution assumption: employee only about $648,789 at 4% or $432,526 at 6%; with 50% employer match about $432,526 at 4% or $288,351 at 6%; with 100% employer match about $324,395 at 4% or $216,263 at 6%.
Mattson & Co. 401(K) Savings Plan-63$32,575,515$1,072,446$17,023iApproximate average salary by contribution assumption: employee only about $425,574 at 4% or $283,716 at 6%; with 50% employer match about $283,716 at 4% or $189,144 at 6%; with 100% employer match about $212,787 at 4% or $141,858 at 6%.
Mattson & Co. Employee Stock Ownership Plan-58$6,091,786$562,503$9,698iApproximate average salary by contribution assumption: employee only about $242,458 at 4% or $161,639 at 6%; with 50% employer match about $161,639 at 4% or $107,759 at 6%; with 100% employer match about $121,229 at 4% or $80,819 at 6%.
2023261$35,108,568$1,530,099$25,084iApproximate average salary by contribution assumption: employee only about $627,090 at 4% or $418,060 at 6%; with 50% employer match about $418,060 at 4% or $278,707 at 6%; with 100% employer match about $313,545 at 4% or $209,030 at 6%.
Mattson & Co. 401(K) Savings Plan-59$26,908,439$995,389$16,871iApproximate average salary by contribution assumption: employee only about $421,775 at 4% or $281,183 at 6%; with 50% employer match about $281,183 at 4% or $187,456 at 6%; with 100% employer match about $210,888 at 4% or $140,592 at 6%.
Mattson & Co. Employee Stock Ownership Plan-61$8,200,129$534,710$8,766iApproximate average salary by contribution assumption: employee only about $219,143 at 4% or $146,096 at 6%; with 50% employer match about $146,096 at 4% or $97,397 at 6%; with 100% employer match about $109,572 at 4% or $73,048 at 6%.
2022262$31,109,106$1,525,111$24,599iApproximate average salary by contribution assumption: employee only about $614,964 at 4% or $409,976 at 6%; with 50% employer match about $409,976 at 4% or $273,317 at 6%; with 100% employer match about $307,482 at 4% or $204,988 at 6%.
Mattson & Co. 401(K) Savings Plan-62$21,467,198$934,494$15,072iApproximate average salary by contribution assumption: employee only about $376,812 at 4% or $251,208 at 6%; with 50% employer match about $251,208 at 4% or $167,472 at 6%; with 100% employer match about $188,406 at 4% or $125,604 at 6%.
Mattson & Co. Employee Stock Ownership Plan-61$9,641,908$590,617$9,682iApproximate average salary by contribution assumption: employee only about $242,056 at 4% or $161,371 at 6%; with 50% employer match about $161,371 at 4% or $107,581 at 6%; with 100% employer match about $121,028 at 4% or $80,685 at 6%.
2021261$36,469,272$1,706,811$27,981iApproximate average salary by contribution assumption: employee only about $699,513 at 4% or $466,342 at 6%; with 50% employer match about $466,342 at 4% or $310,895 at 6%; with 100% employer match about $349,756 at 4% or $233,171 at 6%.
Mattson & Co. 401(K) Savings Plan-61$26,048,478$1,238,784$20,308iApproximate average salary by contribution assumption: employee only about $507,698 at 4% or $338,466 at 6%; with 50% employer match about $338,466 at 4% or $225,644 at 6%; with 100% employer match about $253,849 at 4% or $169,233 at 6%.
Mattson & Co. Employee Stock Ownership Plan-55$10,420,794$468,027$8,510iApproximate average salary by contribution assumption: employee only about $212,740 at 4% or $141,826 at 6%; with 50% employer match about $141,826 at 4% or $94,551 at 6%; with 100% employer match about $106,370 at 4% or $70,913 at 6%.
2020259$31,282,377$2,292,286$38,852iApproximate average salary by contribution assumption: employee only about $971,308 at 4% or $647,538 at 6%; with 50% employer match about $647,538 at 4% or $431,692 at 6%; with 100% employer match about $485,654 at 4% or $323,769 at 6%.
Mattson & Co. 401(K) Savings Plan-59$22,075,071$1,800,988$30,525iApproximate average salary by contribution assumption: employee only about $763,131 at 4% or $508,754 at 6%; with 50% employer match about $508,754 at 4% or $339,169 at 6%; with 100% employer match about $381,565 at 4% or $254,377 at 6%.
Mattson & Co. Employee Stock Ownership Plan-59$9,207,306$491,298$8,327iApproximate average salary by contribution assumption: employee only about $208,177 at 4% or $138,785 at 6%; with 50% employer match about $138,785 at 4% or $92,523 at 6%; with 100% employer match about $104,089 at 4% or $69,392 at 6%.
2019259$25,802,039$1,491,216$25,275iApproximate average salary by contribution assumption: employee only about $631,871 at 4% or $421,247 at 6%; with 50% employer match about $421,247 at 4% or $280,832 at 6%; with 100% employer match about $315,936 at 4% or $210,624 at 6%.
Mattson & Co. 401(K) Savings Plan-59$16,958,422$1,032,933$17,507iApproximate average salary by contribution assumption: employee only about $437,683 at 4% or $291,789 at 6%; with 50% employer match about $291,789 at 4% or $194,526 at 6%; with 100% employer match about $218,842 at 4% or $145,894 at 6%.
Mattson & Co. Employee Stock Ownership Plan-58$8,843,617$458,283$7,901iApproximate average salary by contribution assumption: employee only about $197,536 at 4% or $131,691 at 6%; with 50% employer match about $131,691 at 4% or $87,794 at 6%; with 100% employer match about $98,768 at 4% or $65,845 at 6%.
2018265$22,820,746$1,301,494$20,023iApproximate average salary by contribution assumption: employee only about $500,575 at 4% or $333,716 at 6%; with 50% employer match about $333,716 at 4% or $222,478 at 6%; with 100% employer match about $250,287 at 4% or $166,858 at 6%.
Mattson & Co. 401(K) Savings Plan-65$13,341,009$882,744$13,581iApproximate average salary by contribution assumption: employee only about $339,517 at 4% or $226,345 at 6%; with 50% employer match about $226,345 at 4% or $150,896 at 6%; with 100% employer match about $169,758 at 4% or $113,172 at 6%.
Mattson & Co. Employee Stock Ownership Plan-52$9,479,737$418,750$8,053iApproximate average salary by contribution assumption: employee only about $201,322 at 4% or $134,215 at 6%; with 50% employer match about $134,215 at 4% or $89,476 at 6%; with 100% employer match about $100,661 at 4% or $67,107 at 6%.
2017256$23,848,559$1,175,828$20,997iApproximate average salary by contribution assumption: employee only about $524,923 at 4% or $349,949 at 6%; with 50% employer match about $349,949 at 4% or $233,299 at 6%; with 100% employer match about $262,462 at 4% or $174,974 at 6%.
Mattson & Co. 401(K) Savings Plan-56$13,989,799$775,024$13,840iApproximate average salary by contribution assumption: employee only about $345,993 at 4% or $230,662 at 6%; with 50% employer match about $230,662 at 4% or $153,775 at 6%; with 100% employer match about $172,996 at 4% or $115,331 at 6%.
Mattson & Co. Employee Stock Ownership Plan-51$9,858,760$400,804$7,859iApproximate average salary by contribution assumption: employee only about $196,473 at 4% or $130,982 at 6%; with 50% employer match about $130,982 at 4% or $87,321 at 6%; with 100% employer match about $98,236 at 4% or $65,491 at 6%.
2016251$22,836,326$1,091,426$21,401iApproximate average salary by contribution assumption: employee only about $535,013 at 4% or $356,675 at 6%; with 50% employer match about $356,675 at 4% or $237,783 at 6%; with 100% employer match about $267,506 at 4% or $178,338 at 6%.
Mattson & Co. 401(K) Savings Plan-51$11,770,202$711,676$13,954iApproximate average salary by contribution assumption: employee only about $348,861 at 4% or $232,574 at 6%; with 50% employer match about $232,574 at 4% or $155,049 at 6%; with 100% employer match about $174,430 at 4% or $116,287 at 6%.
Mattson & Co. Employee Stock Ownership Plan-51$11,066,124$379,750$7,446iApproximate average salary by contribution assumption: employee only about $186,152 at 4% or $124,101 at 6%; with 50% employer match about $124,101 at 4% or $82,734 at 6%; with 100% employer match about $93,076 at 4% or $62,051 at 6%.
2015254$21,700,261$1,094,656$20,271iApproximate average salary by contribution assumption: employee only about $506,785 at 4% or $337,857 at 6%; with 50% employer match about $337,857 at 4% or $225,238 at 6%; with 100% employer match about $253,393 at 4% or $168,928 at 6%.
Mattson & Co. Employee Stock Ownership Plan-53$10,962,552$414,053$7,812iApproximate average salary by contribution assumption: employee only about $195,308 at 4% or $130,205 at 6%; with 50% employer match about $130,205 at 4% or $86,804 at 6%; with 100% employer match about $97,654 at 4% or $65,103 at 6%.
Mattson & Co. 401(K) Savings Plan-54$10,737,709$680,603$12,604iApproximate average salary by contribution assumption: employee only about $315,094 at 4% or $210,063 at 6%; with 50% employer match about $210,063 at 4% or $140,042 at 6%; with 100% employer match about $157,547 at 4% or $105,031 at 6%.
2014259$21,281,952$1,116,759$18,928iApproximate average salary by contribution assumption: employee only about $473,203 at 4% or $315,469 at 6%; with 50% employer match about $315,469 at 4% or $210,312 at 6%; with 100% employer match about $236,601 at 4% or $157,734 at 6%.
Mattson & Co. Employee Stock Ownership Plan-59$10,835,924$391,245$6,631iApproximate average salary by contribution assumption: employee only about $165,782 at 4% or $110,521 at 6%; with 50% employer match about $110,521 at 4% or $73,681 at 6%; with 100% employer match about $82,891 at 4% or $55,261 at 6%.
Mattson & Co. 401(K) Savings Plan-58$10,446,028$725,514$12,509iApproximate average salary by contribution assumption: employee only about $312,722 at 4% or $208,481 at 6%; with 50% employer match about $208,481 at 4% or $138,987 at 6%; with 100% employer match about $156,361 at 4% or $104,241 at 6%.
2013265$20,849,923$1,039,270$15,989iApproximate average salary by contribution assumption: employee only about $399,719 at 4% or $266,479 at 6%; with 50% employer match about $266,479 at 4% or $177,653 at 6%; with 100% employer match about $199,860 at 4% or $133,240 at 6%.
Mattson & Co. Employee Stock Ownership Plan-65$11,045,218$410,648$6,318iApproximate average salary by contribution assumption: employee only about $157,942 at 4% or $105,294 at 6%; with 50% employer match about $105,294 at 4% or $70,196 at 6%; with 100% employer match about $78,971 at 4% or $52,647 at 6%.
Mattson & Co. 401(K) Savings Plan-58$9,804,705$628,622$10,838iApproximate average salary by contribution assumption: employee only about $270,958 at 4% or $180,639 at 6%; with 50% employer match about $180,639 at 4% or $120,426 at 6%; with 100% employer match about $135,479 at 4% or $90,319 at 6%.
2012367$18,973,845$1,119,196$16,704iApproximate average salary by contribution assumption: employee only about $417,610 at 4% or $278,407 at 6%; with 50% employer match about $278,407 at 4% or $185,605 at 6%; with 100% employer match about $208,805 at 4% or $139,203 at 6%.
Mattson & Co. Employee Stock Ownership Plan-64$11,206,866$407,643$6,369iApproximate average salary by contribution assumption: employee only about $159,236 at 4% or $106,157 at 6%; with 50% employer match about $106,157 at 4% or $70,771 at 6%; with 100% employer match about $79,618 at 4% or $53,079 at 6%.
Mattson & Co. 401(K) Savings Plan-67$7,766,979$711,553$10,620iApproximate average salary by contribution assumption: employee only about $265,505 at 4% or $177,003 at 6%; with 50% employer match about $177,003 at 4% or $118,002 at 6%; with 100% employer match about $132,752 at 4% or $88,502 at 6%.
Peter H. Mattson & Co. Inc. Money Purchase Plan-0---
2011371$18,013,325$1,449,749$20,419iApproximate average salary by contribution assumption: employee only about $510,475 at 4% or $340,317 at 6%; with 50% employer match about $340,317 at 4% or $226,878 at 6%; with 100% employer match about $255,238 at 4% or $170,158 at 6%.
Mattson & Co. Employee Stock Ownership Plan-66$11,488,149$367,468$5,568iApproximate average salary by contribution assumption: employee only about $139,192 at 4% or $92,795 at 6%; with 50% employer match about $92,795 at 4% or $61,863 at 6%; with 100% employer match about $69,596 at 4% or $46,397 at 6%.
Mattson & Co. 401(K) Savings Plan-71$6,162,817$1,082,281$15,243iApproximate average salary by contribution assumption: employee only about $381,085 at 4% or $254,057 at 6%; with 50% employer match about $254,057 at 4% or $169,371 at 6%; with 100% employer match about $190,542 at 4% or $127,028 at 6%.
Peter H. Mattson & Co. Inc. Money Purchase Plan-9$362,359--
2010360$17,464,242$927,531$15,459iApproximate average salary by contribution assumption: employee only about $386,471 at 4% or $257,648 at 6%; with 50% employer match about $257,648 at 4% or $171,765 at 6%; with 100% employer match about $193,236 at 4% or $128,824 at 6%.
Mattson & Co. Employee Stock Ownership Plan-60$11,343,697$384,709$6,412iApproximate average salary by contribution assumption: employee only about $160,295 at 4% or $106,864 at 6%; with 50% employer match about $106,864 at 4% or $71,242 at 6%; with 100% employer match about $80,148 at 4% or $53,432 at 6%.
Mattson & Co. 401(K) Savings Plan-55$5,684,837$542,822$9,869iApproximate average salary by contribution assumption: employee only about $246,737 at 4% or $164,492 at 6%; with 50% employer match about $164,492 at 4% or $109,661 at 6%; with 100% employer match about $123,369 at 4% or $82,246 at 6%.
Peter H. Mattson & Co. Inc. Money Purchase Plan-9$435,708--
2009365$17,499,104$986,222$15,173iApproximate average salary by contribution assumption: employee only about $379,316 at 4% or $252,877 at 6%; with 50% employer match about $252,877 at 4% or $168,585 at 6%; with 100% employer match about $189,658 at 4% or $126,439 at 6%.
Mattson & Co. Employee Stock Ownership Plan-60$11,572,498$444,641$7,411iApproximate average salary by contribution assumption: employee only about $185,267 at 4% or $123,511 at 6%; with 50% employer match about $123,511 at 4% or $82,341 at 6%; with 100% employer match about $92,634 at 4% or $61,756 at 6%.
Mattson & Co. 401(K) Savings Plan-65$5,306,660$541,581$8,332iApproximate average salary by contribution assumption: employee only about $208,300 at 4% or $138,867 at 6%; with 50% employer match about $138,867 at 4% or $92,578 at 6%; with 100% employer match about $104,150 at 4% or $69,433 at 6%.
Peter H. Mattson & Co. Inc. Money Purchase Plan-9$619,946--
2008366$4,316,588$569,282$8,625iApproximate average salary by contribution assumption: employee only about $215,637 at 4% or $143,758 at 6%; with 50% employer match about $143,758 at 4% or $95,839 at 6%; with 100% employer match about $107,819 at 4% or $71,879 at 6%.
Mattson & Co. 401(K) Savings Plan-66$3,715,840$569,282$8,625iApproximate average salary by contribution assumption: employee only about $215,637 at 4% or $143,758 at 6%; with 50% employer match about $143,758 at 4% or $95,839 at 6%; with 100% employer match about $107,819 at 4% or $71,879 at 6%.
Peter H. Mattson & Co. Inc. Money Purchase Plan-9$600,748--
Mattson & Co. Employee Stock Ownership Plan-66---
2007364$5,410,603$1,208,150$18,877iApproximate average salary by contribution assumption: employee only about $471,934 at 4% or $314,622 at 6%; with 50% employer match about $314,622 at 4% or $209,748 at 6%; with 100% employer match about $235,967 at 4% or $157,311 at 6%.
Mattson & Co. 401(K) Savings Plan-64$5,410,603$1,208,150$18,877iApproximate average salary by contribution assumption: employee only about $471,934 at 4% or $314,622 at 6%; with 50% employer match about $314,622 at 4% or $209,748 at 6%; with 100% employer match about $235,967 at 4% or $157,311 at 6%.
Peter H. Mattson & Co. Inc. Money Purchase Plan-10---
Mattson & Co. Employee Stock Ownership Plan-62---
2006261$16,059,169$763,974$12,524iApproximate average salary by contribution assumption: employee only about $313,104 at 4% or $208,736 at 6%; with 50% employer match about $208,736 at 4% or $139,157 at 6%; with 100% employer match about $156,552 at 4% or $104,368 at 6%.
Mattson & Co. Employee Stock Ownership Plan-61$16,059,169$763,974$12,524iApproximate average salary by contribution assumption: employee only about $313,104 at 4% or $208,736 at 6%; with 50% employer match about $208,736 at 4% or $139,157 at 6%; with 100% employer match about $156,552 at 4% or $104,368 at 6%.
MATTSON AND COMPANY SINGLE EMPLOYER WELFARE BENEFIT PLAN-0---
2005468$18,178,886$850,318$12,505iApproximate average salary by contribution assumption: employee only about $312,617 at 4% or $208,411 at 6%; with 50% employer match about $208,411 at 4% or $138,941 at 6%; with 100% employer match about $156,308 at 4% or $104,206 at 6%.
Mattson & Co. Employee Stock Ownership Plan-63$14,586,957$475,203$7,543iApproximate average salary by contribution assumption: employee only about $188,573 at 4% or $125,715 at 6%; with 50% employer match about $125,715 at 4% or $83,810 at 6%; with 100% employer match about $94,286 at 4% or $62,858 at 6%.
Mattson & Co. 401(K) Savings Plan-68$2,906,402$375,115$5,516iApproximate average salary by contribution assumption: employee only about $137,910 at 4% or $91,940 at 6%; with 50% employer match about $91,940 at 4% or $61,293 at 6%; with 100% employer match about $68,955 at 4% or $45,970 at 6%.
Peter H. Mattson & Co. Inc. Money Purchase Plan-10$685,527--
MATTSON AND COMPANY SINGLE EMPLOYER WELFARE BENEFIT PLAN-1---
2004469$15,633,012$911,285$13,207iApproximate average salary by contribution assumption: employee only about $330,176 at 4% or $220,117 at 6%; with 50% employer match about $220,117 at 4% or $146,745 at 6%; with 100% employer match about $165,088 at 4% or $110,059 at 6%.
Mattson & Co. Employee Stock Ownership Plan-64$12,331,770$486,424$7,600iApproximate average salary by contribution assumption: employee only about $190,009 at 4% or $126,673 at 6%; with 50% employer match about $126,673 at 4% or $84,449 at 6%; with 100% employer match about $95,005 at 4% or $63,336 at 6%.
Mattson & Co. 401(K) Savings Plan-69$2,402,217$424,861$6,157iApproximate average salary by contribution assumption: employee only about $153,935 at 4% or $102,623 at 6%; with 50% employer match about $102,623 at 4% or $68,416 at 6%; with 100% employer match about $76,968 at 4% or $51,312 at 6%.
Peter H. Mattson & Co. Inc. Money Purchase Plan-10$899,025--
MATTSON AND COMPANY SINGLE EMPLOYER WELFARE BENEFIT PLAN-1---
2003272$1,721,345$346,378$4,811iApproximate average salary by contribution assumption: employee only about $120,270 at 4% or $80,180 at 6%; with 50% employer match about $80,180 at 4% or $53,453 at 6%; with 100% employer match about $60,135 at 4% or $40,090 at 6%.
Mattson & Co. 401(K) Savings Plan-72$1,721,345$346,378$4,811iApproximate average salary by contribution assumption: employee only about $120,270 at 4% or $80,180 at 6%; with 50% employer match about $80,180 at 4% or $53,453 at 6%; with 100% employer match about $60,135 at 4% or $40,090 at 6%.
Mattson & Co. Employee Stock Ownership Plan-65---
2002270$0$0-
Mattson & Co. 401(K) Savings Plan-70---
Mattson & Co. Employee Stock Ownership Plan-59---
2001151$0$0-
Mattson & Co. Employee Stock Ownership Plan-51---
2000160$9,671,508$803,878$13,398iApproximate average salary by contribution assumption: employee only about $334,949 at 4% or $223,299 at 6%; with 50% employer match about $223,299 at 4% or $148,866 at 6%; with 100% employer match about $167,475 at 4% or $111,650 at 6%.
Mattson & Co. Employee Stock Ownership Plan-60$9,671,508$803,878$13,398iApproximate average salary by contribution assumption: employee only about $334,949 at 4% or $223,299 at 6%; with 50% employer match about $223,299 at 4% or $148,866 at 6%; with 100% employer match about $167,475 at 4% or $111,650 at 6%.