Plan Ledger DOL Form 5500 · updated monthly

Synlogic Operating Company, Inc.401(k)

SYNLOGIC 401(K) PLAN · CAMBRIDGE, MA · plan year 2023

Reported admin expense ratio · 2023
0.18%

Peer grade: A · admin costs + employer contributions vs same-size plans · how grading works

Synlogic Operating Company, Inc. reported $12,491 in plan administrative expenses for 2023: 0.18% of average plan assets, lower than ~75% of peers. Employer contributions averaged $5,809 per active participant. This ratio covers administrative expenses reported on the plan's Schedule H only; fund-level expense ratios are not included in public structured data — see methodology.

Across the 2 years on file its reported administrative ratio fell from 0.20% to 0.15%. The plan sits in the $1M–$10M size bracket, benchmarked here against 22,307 comparable plans and shown alongside other professional & technical services employers. By assets it is among the smaller plans on file in Massachusetts (2,057th of 2,726), and 8,722nd of 11,654 in professional & technical services. In 2023, employees put in $3.11 for every $1.00 the employer contributed; active participation has shrunk from 71 to 58 since 2022.

Plan summary
Net assets, end of year$7,921,590
Participants with balances120
Active participants58
Employer contributions$336,918
Employee contributions$1,047,748
Employer contribution per active participant$5,809
Average account balance$66,013
Benefits paid to participants$1,281,545
Plan auditUnmodified (clean) audit opinion
Plan history3
Yearassets · accounts · employer contribution
2024$6.7M · 84 accts · $135K emplr
2023$7.9M · 120 accts · $337K emplr
2022$6.3M · 109 accts · $434K emplr
Administrative expenses, itemized · 2023
Recordkeeping & contract admin$10,506
Investment management$1,985
Total administrative$12,491
The Synlogic Operating Company, Inc. 401(k) match · 2023
Employer contribution per active participant$5,809
Median for plans this size$1,308
2024$67,656 per active participant
2023$5,809 per active participant
2022$6,107 per active participant

Synlogic Operating Company, Inc.'s 2023 employer contribution ran above the $1,308 median for plans its size, placing it in the top quarter of its peers. Filings report dollars actually contributed, not the match formula; the formula itself (for example, 50% of the first 6% of pay) lives in the plan's summary plan description from HR.

What these fees cost you

Annual cost at the plan's reported 2023 administrative ratio, against the median plan its size; fund expense ratios are extra. Compare any plan.

Service providers · 20231
FIDELITY INVESTMENTS INSTITUTIONAL · Loan processing$10,506

Compensation shown is direct payments from plan assets reported on Schedule C. Providers paid through fund revenue-sharing appear as indirect.

Administrative cost history3
2024$10,898 · 0.15%
2023$12,491 · 0.18%
2022$12,837 · 0.20%
Similar plansProfessional & Technical Services · Massachusetts
Lyndra Therapeutics, Inc. MA$8.1M · 0.36%
Boston Semi Equipment LLC MA$8.1M · 0.42%
Affinivax Inc MA$8.0M · 0.31%
Toolsgroup, Inc. MA$7.8M · 0.78%
Avrobio, Inc MA$7.7M · 0.03%

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Source: U.S. Department of Labor, Form 5500 series, EIN 465311566 · Verify on EFAST2 · Amounts are as reported by the plan sponsor for the plan year shown.