Current Snapshot
Latest Year
2024
2024 Participants
87
2024 Assets
$6,863,910
2024 Contributions
$1,408,506
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 | 1 | 87 | $6,863,910 | $1,408,506 | $16,190iApproximate average salary by contribution assumption: employee only about $404,743 at 4% or $269,829 at 6%; with 50% employer match about $269,829 at 4% or $179,886 at 6%; with 100% employer match about $202,372 at 4% or $134,914 at 6%. |
| Spero Opco Inc. | - | 87 | $6,863,910 | $1,408,506 | $16,190iApproximate average salary by contribution assumption: employee only about $404,743 at 4% or $269,829 at 6%; with 50% employer match about $269,829 at 4% or $179,886 at 6%; with 100% employer match about $202,372 at 4% or $134,914 at 6%. |
| 2023 | 1 | 99 | $5,882,623 | $1,289,921 | $13,030iApproximate average salary by contribution assumption: employee only about $325,738 at 4% or $217,158 at 6%; with 50% employer match about $217,158 at 4% or $144,772 at 6%; with 100% employer match about $162,869 at 4% or $108,579 at 6%. |
| Spero Opco Inc. | - | 99 | $5,882,623 | $1,289,921 | $13,030iApproximate average salary by contribution assumption: employee only about $325,738 at 4% or $217,158 at 6%; with 50% employer match about $217,158 at 4% or $144,772 at 6%; with 100% employer match about $162,869 at 4% or $108,579 at 6%. |
| 2022 | 1 | 35 | $5,764,683 | $2,399,272 | $68,551iApproximate average salary by contribution assumption: employee only about $1,713,766 at 4% or $1,142,510 at 6%; with 50% employer match about $1,142,510 at 4% or $761,674 at 6%; with 100% employer match about $856,883 at 4% or $571,255 at 6%. |
| Spero Opco Inc. | - | 35 | $5,764,683 | $2,399,272 | $68,551iApproximate average salary by contribution assumption: employee only about $1,713,766 at 4% or $1,142,510 at 6%; with 50% employer match about $1,142,510 at 4% or $761,674 at 6%; with 100% employer match about $856,883 at 4% or $571,255 at 6%. |
| 2021 | 2 | 160 | $8,424,780 | $2,693,982 | $16,837iApproximate average salary by contribution assumption: employee only about $420,935 at 4% or $280,623 at 6%; with 50% employer match about $280,623 at 4% or $187,082 at 6%; with 100% employer match about $210,467 at 4% or $140,312 at 6%. |
| Spero Opco Inc. | - | 160 | $8,424,780 | $2,693,982 | $16,837iApproximate average salary by contribution assumption: employee only about $420,935 at 4% or $280,623 at 6%; with 50% employer match about $280,623 at 4% or $187,082 at 6%; with 100% employer match about $210,467 at 4% or $140,312 at 6%. |
| SPERO THERAPEUTICS, INC. EMPLOYEE BENEFIT PLAN | - | 51 | - | - | - |
| 2020 | 1 | 94 | $5,171,087 | $2,394,866 | $25,477iApproximate average salary by contribution assumption: employee only about $636,932 at 4% or $424,622 at 6%; with 50% employer match about $424,622 at 4% or $283,081 at 6%; with 100% employer match about $318,466 at 4% or $212,311 at 6%. |
| Spero Opco Inc. | - | 94 | $5,171,087 | $2,394,866 | $25,477iApproximate average salary by contribution assumption: employee only about $636,932 at 4% or $424,622 at 6%; with 50% employer match about $424,622 at 4% or $283,081 at 6%; with 100% employer match about $318,466 at 4% or $212,311 at 6%. |
| 2019 | 1 | 63 | $2,563,134 | $1,106,892 | $17,570iApproximate average salary by contribution assumption: employee only about $439,243 at 4% or $292,829 at 6%; with 50% employer match about $292,829 at 4% or $195,219 at 6%; with 100% employer match about $219,621 at 4% or $146,414 at 6%. |
| Spero Opco Inc. | - | 63 | $2,563,134 | $1,106,892 | $17,570iApproximate average salary by contribution assumption: employee only about $439,243 at 4% or $292,829 at 6%; with 50% employer match about $292,829 at 4% or $195,219 at 6%; with 100% employer match about $219,621 at 4% or $146,414 at 6%. |
| 2018 | 1 | 40 | $1,434,392 | $549,207 | $13,730iApproximate average salary by contribution assumption: employee only about $343,254 at 4% or $228,836 at 6%; with 50% employer match about $228,836 at 4% or $152,558 at 6%; with 100% employer match about $171,627 at 4% or $114,418 at 6%. |
| Spero Opco Inc. | - | 40 | $1,434,392 | $549,207 | $13,730iApproximate average salary by contribution assumption: employee only about $343,254 at 4% or $228,836 at 6%; with 50% employer match about $228,836 at 4% or $152,558 at 6%; with 100% employer match about $171,627 at 4% or $114,418 at 6%. |
| 2017 | 1 | 27 | $1,001,911 | $379,027 | $14,038iApproximate average salary by contribution assumption: employee only about $350,951 at 4% or $233,967 at 6%; with 50% employer match about $233,967 at 4% or $155,978 at 6%; with 100% employer match about $175,475 at 4% or $116,984 at 6%. |
| Spero Opco Inc. | - | 27 | $1,001,911 | $379,027 | $14,038iApproximate average salary by contribution assumption: employee only about $350,951 at 4% or $233,967 at 6%; with 50% employer match about $233,967 at 4% or $155,978 at 6%; with 100% employer match about $175,475 at 4% or $116,984 at 6%. |
| 2016 | 1 | 18 | $550,629 | $226,078 | $12,560iApproximate average salary by contribution assumption: employee only about $313,997 at 4% or $209,331 at 6%; with 50% employer match about $209,331 at 4% or $139,554 at 6%; with 100% employer match about $156,999 at 4% or $104,666 at 6%. |
| Spero Opco Inc. | - | 18 | $550,629 | $226,078 | $12,560iApproximate average salary by contribution assumption: employee only about $313,997 at 4% or $209,331 at 6%; with 50% employer match about $209,331 at 4% or $139,554 at 6%; with 100% employer match about $156,999 at 4% or $104,666 at 6%. |
| 2015 | 1 | 11 | $286,025 | $265,014 | $24,092iApproximate average salary by contribution assumption: employee only about $602,305 at 4% or $401,536 at 6%; with 50% employer match about $401,536 at 4% or $267,691 at 6%; with 100% employer match about $301,152 at 4% or $200,768 at 6%. |
| Spero Opco Inc. | - | 11 | $286,025 | $265,014 | $24,092iApproximate average salary by contribution assumption: employee only about $602,305 at 4% or $401,536 at 6%; with 50% employer match about $401,536 at 4% or $267,691 at 6%; with 100% employer match about $301,152 at 4% or $200,768 at 6%. |
| 2014 | 1 | 2 | $33,110 | $32,696 | $16,348iApproximate average salary by contribution assumption: employee only about $408,700 at 4% or $272,467 at 6%; with 50% employer match about $272,467 at 4% or $181,644 at 6%; with 100% employer match about $204,350 at 4% or $136,233 at 6%. |
| Spero Opco Inc. | - | 2 | $33,110 | $32,696 | $16,348iApproximate average salary by contribution assumption: employee only about $408,700 at 4% or $272,467 at 6%; with 50% employer match about $272,467 at 4% or $181,644 at 6%; with 100% employer match about $204,350 at 4% or $136,233 at 6%. |