Current Snapshot
Latest Year
2024
2024 Participants
225
2024 Assets
$87,794,016
2024 Contributions
$7,949,651
Historical Graphs
Total Assets Over Time
Aggregate end-of-year assets by filing year, excluding zero-asset years
Participants Over Time
Largest reported end-of-year plan headcount by filing year, used to avoid double-counting participants across overlapping plans
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 / Filing | Filings | Participants | Assets | Contributions | Contrib./Participant |
|---|---|---|---|---|---|
| 2024 | 2 | 225 | $87,794,016 | $7,949,651 | $35,332iApproximate average salary by contribution assumption: employee only about $883,295 at 4% or $588,863 at 6%; with 50% employer match about $588,863 at 4% or $392,575 at 6%; with 100% employer match about $441,647 at 4% or $294,432 at 6%. |
| Microbia Inc. 401 K Plan | - | 221 | $87,794,016 | $7,949,651 | $35,971iApproximate average salary by contribution assumption: employee only about $899,282 at 4% or $599,521 at 6%; with 50% employer match about $599,521 at 4% or $399,681 at 6%; with 100% employer match about $449,641 at 4% or $299,761 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 225 | - | - | - |
| 2023 | 2 | 216 | $78,537,223 | $7,342,120 | $33,991iApproximate average salary by contribution assumption: employee only about $849,782 at 4% or $566,522 at 6%; with 50% employer match about $566,522 at 4% or $377,681 at 6%; with 100% employer match about $424,891 at 4% or $283,261 at 6%. |
| Microbia Inc. 401 K Plan | - | 216 | $78,537,223 | $7,342,120 | $33,991iApproximate average salary by contribution assumption: employee only about $849,782 at 4% or $566,522 at 6%; with 50% employer match about $566,522 at 4% or $377,681 at 6%; with 100% employer match about $424,891 at 4% or $283,261 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 213 | - | - | - |
| 2022 | 2 | 219 | $69,471,452 | $6,733,555 | $30,747iApproximate average salary by contribution assumption: employee only about $768,671 at 4% or $512,447 at 6%; with 50% employer match about $512,447 at 4% or $341,631 at 6%; with 100% employer match about $384,335 at 4% or $256,224 at 6%. |
| Microbia Inc. 401 K Plan | - | 219 | $69,471,452 | $6,733,555 | $30,747iApproximate average salary by contribution assumption: employee only about $768,671 at 4% or $512,447 at 6%; with 50% employer match about $512,447 at 4% or $341,631 at 6%; with 100% employer match about $384,335 at 4% or $256,224 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 219 | - | - | - |
| 2021 | 2 | 220 | $85,248,661 | $6,992,909 | $31,786iApproximate average salary by contribution assumption: employee only about $794,649 at 4% or $529,766 at 6%; with 50% employer match about $529,766 at 4% or $353,177 at 6%; with 100% employer match about $397,324 at 4% or $264,883 at 6%. |
| Microbia Inc. 401 K Plan | - | 220 | $85,248,661 | $6,992,909 | $31,786iApproximate average salary by contribution assumption: employee only about $794,649 at 4% or $529,766 at 6%; with 50% employer match about $529,766 at 4% or $353,177 at 6%; with 100% employer match about $397,324 at 4% or $264,883 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 219 | - | - | - |
| 2020 | 2 | 308 | $84,098,802 | $8,699,461 | $28,245iApproximate average salary by contribution assumption: employee only about $706,125 at 4% or $470,750 at 6%; with 50% employer match about $470,750 at 4% or $313,833 at 6%; with 100% employer match about $353,063 at 4% or $235,375 at 6%. |
| Microbia Inc. 401 K Plan | - | 234 | $84,098,802 | $8,699,461 | $37,177iApproximate average salary by contribution assumption: employee only about $929,430 at 4% or $619,620 at 6%; with 50% employer match about $619,620 at 4% or $413,080 at 6%; with 100% employer match about $464,715 at 4% or $309,810 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 308 | - | - | - |
| 2019 | 2 | 446 | $74,901,289 | $9,237,762 | $20,712iApproximate average salary by contribution assumption: employee only about $517,812 at 4% or $345,208 at 6%; with 50% employer match about $345,208 at 4% or $230,139 at 6%; with 100% employer match about $258,906 at 4% or $172,604 at 6%. |
| Microbia Inc. 401 K Plan | - | 446 | $74,901,289 | $9,237,762 | $20,712iApproximate average salary by contribution assumption: employee only about $517,812 at 4% or $345,208 at 6%; with 50% employer match about $345,208 at 4% or $230,139 at 6%; with 100% employer match about $258,906 at 4% or $172,604 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 294 | - | - | - |
| 2018 | 2 | 514 | $84,124,369 | $13,156,880 | $25,597iApproximate average salary by contribution assumption: employee only about $639,926 at 4% or $426,617 at 6%; with 50% employer match about $426,617 at 4% or $284,412 at 6%; with 100% employer match about $319,963 at 4% or $213,309 at 6%. |
| Microbia Inc. 401 K Plan | - | 514 | $84,124,369 | $13,156,880 | $25,597iApproximate average salary by contribution assumption: employee only about $639,926 at 4% or $426,617 at 6%; with 50% employer match about $426,617 at 4% or $284,412 at 6%; with 100% employer match about $319,963 at 4% or $213,309 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 514 | - | - | - |
| 2017 | 2 | 731 | $86,248,473 | $14,814,934 | $20,267iApproximate average salary by contribution assumption: employee only about $506,667 at 4% or $337,778 at 6%; with 50% employer match about $337,778 at 4% or $225,185 at 6%; with 100% employer match about $253,333 at 4% or $168,889 at 6%. |
| Microbia Inc. 401 K Plan | - | 730 | $86,248,473 | $14,814,934 | $20,294iApproximate average salary by contribution assumption: employee only about $507,361 at 4% or $338,241 at 6%; with 50% employer match about $338,241 at 4% or $225,494 at 6%; with 100% employer match about $253,680 at 4% or $169,120 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 731 | - | - | - |
| 2016 | 2 | 695 | $64,789,138 | $12,865,428 | $18,511iApproximate average salary by contribution assumption: employee only about $462,785 at 4% or $308,523 at 6%; with 50% employer match about $308,523 at 4% or $205,682 at 6%; with 100% employer match about $231,393 at 4% or $154,262 at 6%. |
| Microbia Inc. 401 K Plan | - | 695 | $64,789,138 | $12,865,428 | $18,511iApproximate average salary by contribution assumption: employee only about $462,785 at 4% or $308,523 at 6%; with 50% employer match about $308,523 at 4% or $205,682 at 6%; with 100% employer match about $231,393 at 4% or $154,262 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 674 | - | - | - |
| 2015 | 2 | 497 | $51,470,612 | $9,328,342 | $18,769iApproximate average salary by contribution assumption: employee only about $469,232 at 4% or $312,822 at 6%; with 50% employer match about $312,822 at 4% or $208,548 at 6%; with 100% employer match about $234,616 at 4% or $156,411 at 6%. |
| Microbia Inc. 401 K Plan | - | 497 | $51,470,612 | $9,328,342 | $18,769iApproximate average salary by contribution assumption: employee only about $469,232 at 4% or $312,822 at 6%; with 50% employer match about $312,822 at 4% or $208,548 at 6%; with 100% employer match about $234,616 at 4% or $156,411 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 476 | - | - | - |
| 2014 | 2 | 465 | $46,483,096 | $8,402,644 | $18,070iApproximate average salary by contribution assumption: employee only about $451,755 at 4% or $301,170 at 6%; with 50% employer match about $301,170 at 4% or $200,780 at 6%; with 100% employer match about $225,878 at 4% or $150,585 at 6%. |
| Microbia Inc. 401 K Plan | - | 465 | $46,483,096 | $8,402,644 | $18,070iApproximate average salary by contribution assumption: employee only about $451,755 at 4% or $301,170 at 6%; with 50% employer match about $301,170 at 4% or $200,780 at 6%; with 100% employer match about $225,878 at 4% or $150,585 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 423 | - | - | - |
| 2013 | 2 | 533 | $39,524,427 | $10,966,429 | $20,575iApproximate average salary by contribution assumption: employee only about $514,373 at 4% or $342,915 at 6%; with 50% employer match about $342,915 at 4% or $228,610 at 6%; with 100% employer match about $257,186 at 4% or $171,458 at 6%. |
| Microbia Inc. 401 K Plan | - | 533 | $39,524,427 | $10,966,429 | $20,575iApproximate average salary by contribution assumption: employee only about $514,373 at 4% or $342,915 at 6%; with 50% employer match about $342,915 at 4% or $228,610 at 6%; with 100% employer match about $257,186 at 4% or $171,458 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 427 | - | - | - |
| 2012 | 2 | 528 | $24,224,808 | $7,880,778 | $14,926iApproximate average salary by contribution assumption: employee only about $373,143 at 4% or $248,762 at 6%; with 50% employer match about $248,762 at 4% or $165,841 at 6%; with 100% employer match about $186,571 at 4% or $124,381 at 6%. |
| Microbia Inc. 401 K Plan | - | 528 | $24,224,808 | $7,880,778 | $14,926iApproximate average salary by contribution assumption: employee only about $373,143 at 4% or $248,762 at 6%; with 50% employer match about $248,762 at 4% or $165,841 at 6%; with 100% employer match about $186,571 at 4% or $124,381 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 433 | - | - | - |
| 2011 | 2 | 281 | $14,572,337 | $3,910,652 | $13,917iApproximate average salary by contribution assumption: employee only about $347,923 at 4% or $231,949 at 6%; with 50% employer match about $231,949 at 4% or $154,632 at 6%; with 100% employer match about $173,961 at 4% or $115,974 at 6%. |
| Microbia Inc. 401 K Plan | - | 276 | $14,572,337 | $3,910,652 | $14,169iApproximate average salary by contribution assumption: employee only about $354,226 at 4% or $236,150 at 6%; with 50% employer match about $236,150 at 4% or $157,434 at 6%; with 100% employer match about $177,113 at 4% or $118,075 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 281 | - | - | - |
| 2010 | 2 | 239 | $14,127,835 | $2,862,812 | $11,978iApproximate average salary by contribution assumption: employee only about $299,457 at 4% or $199,638 at 6%; with 50% employer match about $199,638 at 4% or $133,092 at 6%; with 100% employer match about $149,729 at 4% or $99,819 at 6%. |
| Microbia Inc. 401 K Plan | - | 216 | $14,127,835 | $2,862,812 | $13,254iApproximate average salary by contribution assumption: employee only about $331,344 at 4% or $220,896 at 6%; with 50% employer match about $220,896 at 4% or $147,264 at 6%; with 100% employer match about $165,672 at 4% or $110,448 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 239 | - | - | - |
| 2009 | 2 | 206 | $10,193,045 | $2,936,680 | $14,256iApproximate average salary by contribution assumption: employee only about $356,393 at 4% or $237,595 at 6%; with 50% employer match about $237,595 at 4% or $158,397 at 6%; with 100% employer match about $178,197 at 4% or $118,798 at 6%. |
| Microbia Inc. 401 K Plan | - | 188 | $10,193,045 | $2,936,680 | $15,621iApproximate average salary by contribution assumption: employee only about $390,516 at 4% or $260,344 at 6%; with 50% employer match about $260,344 at 4% or $173,563 at 6%; with 100% employer match about $195,258 at 4% or $130,172 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 206 | - | - | - |
| 2008 | 2 | 205 | $5,391,367 | $2,176,884 | $10,619iApproximate average salary by contribution assumption: employee only about $265,474 at 4% or $176,982 at 6%; with 50% employer match about $176,982 at 4% or $117,988 at 6%; with 100% employer match about $132,737 at 4% or $88,491 at 6%. |
| Microbia Inc. 401 K Plan | - | 196 | $5,391,367 | $2,176,884 | $11,107iApproximate average salary by contribution assumption: employee only about $277,664 at 4% or $185,109 at 6%; with 50% employer match about $185,109 at 4% or $123,406 at 6%; with 100% employer match about $138,832 at 4% or $92,555 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 205 | - | - | - |
| 2007 | 2 | 180 | $5,620,292 | $1,173,521 | $6,520iApproximate average salary by contribution assumption: employee only about $162,989 at 4% or $108,659 at 6%; with 50% employer match about $108,659 at 4% or $72,440 at 6%; with 100% employer match about $81,495 at 4% or $54,330 at 6%. |
| Microbia Inc. 401 K Plan | - | 150 | $5,620,292 | $1,173,521 | $7,823iApproximate average salary by contribution assumption: employee only about $195,587 at 4% or $130,391 at 6%; with 50% employer match about $130,391 at 4% or $86,927 at 6%; with 100% employer match about $97,793 at 4% or $65,196 at 6%. |
| Ironwood Pharmaceuticals Inc. Health and Welfare Plan | - | 180 | - | - | - |
| 2006 | 1 | 109 | $4,189,201 | $818,564 | $7,510iApproximate average salary by contribution assumption: employee only about $187,744 at 4% or $125,163 at 6%; with 50% employer match about $125,163 at 4% or $83,442 at 6%; with 100% employer match about $93,872 at 4% or $62,581 at 6%. |
| Microbia Inc. 401 K Plan | - | 109 | $4,189,201 | $818,564 | $7,510iApproximate average salary by contribution assumption: employee only about $187,744 at 4% or $125,163 at 6%; with 50% employer match about $125,163 at 4% or $83,442 at 6%; with 100% employer match about $93,872 at 4% or $62,581 at 6%. |
| 2005 | 1 | 68 | $3,032,031 | $854,680 | $12,569iApproximate average salary by contribution assumption: employee only about $314,221 at 4% or $209,480 at 6%; with 50% employer match about $209,480 at 4% or $139,654 at 6%; with 100% employer match about $157,110 at 4% or $104,740 at 6%. |
| Microbia Inc. 401 K Plan | - | 68 | $3,032,031 | $854,680 | $12,569iApproximate average salary by contribution assumption: employee only about $314,221 at 4% or $209,480 at 6%; with 50% employer match about $209,480 at 4% or $139,654 at 6%; with 100% employer match about $157,110 at 4% or $104,740 at 6%. |
| 2004 | 1 | 66 | $2,123,784 | $549,911 | $8,332iApproximate average salary by contribution assumption: employee only about $208,300 at 4% or $138,866 at 6%; with 50% employer match about $138,866 at 4% or $92,578 at 6%; with 100% employer match about $104,150 at 4% or $69,433 at 6%. |
| Microbia Inc. 401 K Plan | - | 66 | $2,123,784 | $549,911 | $8,332iApproximate average salary by contribution assumption: employee only about $208,300 at 4% or $138,866 at 6%; with 50% employer match about $138,866 at 4% or $92,578 at 6%; with 100% employer match about $104,150 at 4% or $69,433 at 6%. |
| 2003 | 1 | 73 | $1,441,963 | $665,421 | $9,115iApproximate average salary by contribution assumption: employee only about $227,884 at 4% or $151,923 at 6%; with 50% employer match about $151,923 at 4% or $101,282 at 6%; with 100% employer match about $113,942 at 4% or $75,961 at 6%. |
| Microbia Inc. 401 K Plan | - | 73 | $1,441,963 | $665,421 | $9,115iApproximate average salary by contribution assumption: employee only about $227,884 at 4% or $151,923 at 6%; with 50% employer match about $151,923 at 4% or $101,282 at 6%; with 100% employer match about $113,942 at 4% or $75,961 at 6%. |
| 2002 | 1 | 74 | $634,344 | $102,277 | $1,382iApproximate average salary by contribution assumption: employee only about $34,553 at 4% or $23,035 at 6%; with 50% employer match about $23,035 at 4% or $15,357 at 6%; with 100% employer match about $17,277 at 4% or $11,518 at 6%. |
| Microbia Inc. 401 K Plan | - | 74 | $634,344 | $102,277 | $1,382iApproximate average salary by contribution assumption: employee only about $34,553 at 4% or $23,035 at 6%; with 50% employer match about $23,035 at 4% or $15,357 at 6%; with 100% employer match about $17,277 at 4% or $11,518 at 6%. |
| 1999 | 1 | 24 | $206,248 | $163,906 | $6,829iApproximate average salary by contribution assumption: employee only about $170,735 at 4% or $113,824 at 6%; with 50% employer match about $113,824 at 4% or $75,882 at 6%; with 100% employer match about $85,368 at 4% or $56,912 at 6%. |
| Microbia Inc. 401 K Plan | - | 24 | $206,248 | $163,906 | $6,829iApproximate average salary by contribution assumption: employee only about $170,735 at 4% or $113,824 at 6%; with 50% employer match about $113,824 at 4% or $75,882 at 6%; with 100% employer match about $85,368 at 4% or $56,912 at 6%. |