Civic Intelligence

Mersana Therapeutics Inc.

Plan context: Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust

EIN 04-3562403 • Cambridge, MA • 22 filings • 6 plans

840 Memorial DriveCambridge, MA 02139
Current Snapshot

Latest Year

2024

2024 Participants

104

2024 Assets

$31,534,168

2024 Contributions

$3,927,837

Historical Graphs

Total Assets Over Time

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

$31,534,168$15,767,084$0200620152024YearValue
$31,534,168Latest year 2024

Participants Over Time

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

2521260200620152024YearValue
104Latest 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
20241104$31,534,168$3,927,837$37,768iApproximate average salary by contribution assumption: employee only about $944,192 at 4% or $629,461 at 6%; with 50% employer match about $629,461 at 4% or $419,641 at 6%; with 100% employer match about $472,096 at 4% or $314,731 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-104$31,534,168$3,927,837$37,768iApproximate average salary by contribution assumption: employee only about $944,192 at 4% or $629,461 at 6%; with 50% employer match about $629,461 at 4% or $419,641 at 6%; with 100% employer match about $472,096 at 4% or $314,731 at 6%.
20232122$29,145,736$6,371,651$52,227iApproximate average salary by contribution assumption: employee only about $1,305,666 at 4% or $870,444 at 6%; with 50% employer match about $870,444 at 4% or $580,296 at 6%; with 100% employer match about $652,833 at 4% or $435,222 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-122$29,145,736$6,371,651$52,227iApproximate average salary by contribution assumption: employee only about $1,305,666 at 4% or $870,444 at 6%; with 50% employer match about $870,444 at 4% or $580,296 at 6%; with 100% employer match about $652,833 at 4% or $435,222 at 6%.
MERSANA THERAPEUTICS GROUP HEALTH & WELFARE PLAN-110---
20222252$21,985,295$6,397,409$25,387iApproximate average salary by contribution assumption: employee only about $634,664 at 4% or $423,109 at 6%; with 50% employer match about $423,109 at 4% or $282,073 at 6%; with 100% employer match about $317,332 at 4% or $211,555 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-231$21,985,295$6,397,409$27,694iApproximate average salary by contribution assumption: employee only about $692,360 at 4% or $461,574 at 6%; with 50% employer match about $461,574 at 4% or $307,716 at 6%; with 100% employer match about $346,180 at 4% or $230,787 at 6%.
MERSANA THERAPEUTICS GROUP HEALTH & WELFARE PLAN-252---
20212196$20,112,964$4,828,892$24,637iApproximate average salary by contribution assumption: employee only about $615,930 at 4% or $410,620 at 6%; with 50% employer match about $410,620 at 4% or $273,747 at 6%; with 100% employer match about $307,965 at 4% or $205,310 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-163$20,112,964$4,828,892$29,625iApproximate average salary by contribution assumption: employee only about $740,628 at 4% or $493,752 at 6%; with 50% employer match about $493,752 at 4% or $329,168 at 6%; with 100% employer match about $370,314 at 4% or $246,876 at 6%.
MERSANA THERAPEUTICS GROUP HEALTH & WELFARE PLAN-196---
20201102$14,421,093$2,001,624$19,624iApproximate average salary by contribution assumption: employee only about $490,594 at 4% or $327,063 at 6%; with 50% employer match about $327,063 at 4% or $218,042 at 6%; with 100% employer match about $245,297 at 4% or $163,531 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-102$14,421,093$2,001,624$19,624iApproximate average salary by contribution assumption: employee only about $490,594 at 4% or $327,063 at 6%; with 50% employer match about $327,063 at 4% or $218,042 at 6%; with 100% employer match about $245,297 at 4% or $163,531 at 6%.
2019184$11,720,364$1,966,213$23,407iApproximate average salary by contribution assumption: employee only about $585,182 at 4% or $390,122 at 6%; with 50% employer match about $390,122 at 4% or $260,081 at 6%; with 100% employer match about $292,591 at 4% or $195,061 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-84$11,720,364$1,966,213$23,407iApproximate average salary by contribution assumption: employee only about $585,182 at 4% or $390,122 at 6%; with 50% employer match about $390,122 at 4% or $260,081 at 6%; with 100% employer match about $292,591 at 4% or $195,061 at 6%.
2018189$8,137,703$2,120,636$23,827iApproximate average salary by contribution assumption: employee only about $595,684 at 4% or $397,123 at 6%; with 50% employer match about $397,123 at 4% or $264,749 at 6%; with 100% employer match about $297,842 at 4% or $198,561 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-89$8,137,703$2,120,636$23,827iApproximate average salary by contribution assumption: employee only about $595,684 at 4% or $397,123 at 6%; with 50% employer match about $397,123 at 4% or $264,749 at 6%; with 100% employer match about $297,842 at 4% or $198,561 at 6%.
2017176$6,665,770$1,550,951$20,407iApproximate average salary by contribution assumption: employee only about $510,181 at 4% or $340,121 at 6%; with 50% employer match about $340,121 at 4% or $226,747 at 6%; with 100% employer match about $255,091 at 4% or $170,060 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-76$6,665,770$1,550,951$20,407iApproximate average salary by contribution assumption: employee only about $510,181 at 4% or $340,121 at 6%; with 50% employer match about $340,121 at 4% or $226,747 at 6%; with 100% employer match about $255,091 at 4% or $170,060 at 6%.
2016159$4,513,198$1,545,319$26,192iApproximate average salary by contribution assumption: employee only about $654,796 at 4% or $436,531 at 6%; with 50% employer match about $436,531 at 4% or $291,021 at 6%; with 100% employer match about $327,398 at 4% or $218,265 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-59$4,513,198$1,545,319$26,192iApproximate average salary by contribution assumption: employee only about $654,796 at 4% or $436,531 at 6%; with 50% employer match about $436,531 at 4% or $291,021 at 6%; with 100% employer match about $327,398 at 4% or $218,265 at 6%.
2015143$2,648,445$597,019$13,884iApproximate average salary by contribution assumption: employee only about $347,104 at 4% or $231,403 at 6%; with 50% employer match about $231,403 at 4% or $154,268 at 6%; with 100% employer match about $173,552 at 4% or $115,701 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-43$2,648,445$597,019$13,884iApproximate average salary by contribution assumption: employee only about $347,104 at 4% or $231,403 at 6%; with 50% employer match about $231,403 at 4% or $154,268 at 6%; with 100% employer match about $173,552 at 4% or $115,701 at 6%.
2014131$2,250,204$719,687$23,216iApproximate average salary by contribution assumption: employee only about $580,393 at 4% or $386,928 at 6%; with 50% employer match about $386,928 at 4% or $257,952 at 6%; with 100% employer match about $290,196 at 4% or $193,464 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-31$2,250,204$719,687$23,216iApproximate average salary by contribution assumption: employee only about $580,393 at 4% or $386,928 at 6%; with 50% employer match about $386,928 at 4% or $257,952 at 6%; with 100% employer match about $290,196 at 4% or $193,464 at 6%.
2013127$1,516,059$304,823$11,290iApproximate average salary by contribution assumption: employee only about $282,244 at 4% or $188,162 at 6%; with 50% employer match about $188,162 at 4% or $125,442 at 6%; with 100% employer match about $141,122 at 4% or $94,081 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-27$1,516,059$304,823$11,290iApproximate average salary by contribution assumption: employee only about $282,244 at 4% or $188,162 at 6%; with 50% employer match about $188,162 at 4% or $125,442 at 6%; with 100% employer match about $141,122 at 4% or $94,081 at 6%.
2012122$1,008,540$245,233$11,147iApproximate average salary by contribution assumption: employee only about $278,674 at 4% or $185,783 at 6%; with 50% employer match about $185,783 at 4% or $123,855 at 6%; with 100% employer match about $139,337 at 4% or $92,891 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-22$1,008,540$245,233$11,147iApproximate average salary by contribution assumption: employee only about $278,674 at 4% or $185,783 at 6%; with 50% employer match about $185,783 at 4% or $123,855 at 6%; with 100% employer match about $139,337 at 4% or $92,891 at 6%.
2011121$872,420$250,542$11,931iApproximate average salary by contribution assumption: employee only about $298,264 at 4% or $198,843 at 6%; with 50% employer match about $198,843 at 4% or $132,562 at 6%; with 100% employer match about $149,132 at 4% or $99,421 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-21$872,420$250,542$11,931iApproximate average salary by contribution assumption: employee only about $298,264 at 4% or $198,843 at 6%; with 50% employer match about $198,843 at 4% or $132,562 at 6%; with 100% employer match about $149,132 at 4% or $99,421 at 6%.
2010124$948,145$265,149$11,048iApproximate average salary by contribution assumption: employee only about $276,197 at 4% or $184,131 at 6%; with 50% employer match about $184,131 at 4% or $122,754 at 6%; with 100% employer match about $138,098 at 4% or $92,066 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-24$948,145$265,149$11,048iApproximate average salary by contribution assumption: employee only about $276,197 at 4% or $184,131 at 6%; with 50% employer match about $184,131 at 4% or $122,754 at 6%; with 100% employer match about $138,098 at 4% or $92,066 at 6%.
2009123$758,451$279,621$12,157iApproximate average salary by contribution assumption: employee only about $303,936 at 4% or $202,624 at 6%; with 50% employer match about $202,624 at 4% or $135,083 at 6%; with 100% employer match about $151,968 at 4% or $101,312 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-23$758,451$279,621$12,157iApproximate average salary by contribution assumption: employee only about $303,936 at 4% or $202,624 at 6%; with 50% employer match about $202,624 at 4% or $135,083 at 6%; with 100% employer match about $151,968 at 4% or $101,312 at 6%.
2008119$341,223$214,908$11,311iApproximate average salary by contribution assumption: employee only about $282,774 at 4% or $188,516 at 6%; with 50% employer match about $188,516 at 4% or $125,677 at 6%; with 100% employer match about $141,387 at 4% or $94,258 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-19$341,223$214,908$11,311iApproximate average salary by contribution assumption: employee only about $282,774 at 4% or $188,516 at 6%; with 50% employer match about $188,516 at 4% or $125,677 at 6%; with 100% employer match about $141,387 at 4% or $94,258 at 6%.
2007116$244,415$182,156$11,385iApproximate average salary by contribution assumption: employee only about $284,619 at 4% or $189,746 at 6%; with 50% employer match about $189,746 at 4% or $126,497 at 6%; with 100% employer match about $142,309 at 4% or $94,873 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-16$244,415$182,156$11,385iApproximate average salary by contribution assumption: employee only about $284,619 at 4% or $189,746 at 6%; with 50% employer match about $189,746 at 4% or $126,497 at 6%; with 100% employer match about $142,309 at 4% or $94,873 at 6%.
2006113$98,157$60,698$4,669iApproximate average salary by contribution assumption: employee only about $116,727 at 4% or $77,818 at 6%; with 50% employer match about $77,818 at 4% or $51,879 at 6%; with 100% employer match about $58,363 at 4% or $38,909 at 6%.
Mersana Therapeutics Inc. 401(K) Profit Sharing Plan Trust-13$98,157$60,698$4,669iApproximate average salary by contribution assumption: employee only about $116,727 at 4% or $77,818 at 6%; with 50% employer match about $77,818 at 4% or $51,879 at 6%; with 100% employer match about $58,363 at 4% or $38,909 at 6%.