Biogen Inc.401(k)

Biogen Inc.'s 2024 Form 5500 did not separately report plan administrative expenses, which is common where recordkeeping is paid through investment revenue-sharing or a master trust. The plan held $2,159,190,583 across 7,636 participant accounts, with employer contributions averaging $10,760 per active participant. See methodology for what Form 5500 does and doesn't capture.

The plan sits in the over $1B size bracket, benchmarked here against 1,229 comparable plans and shown alongside other manufacturing employers. By assets it is the 24th-largest of 2,726 plans among Massachusetts employers on file, and the 154th of 13,661 in manufacturing. In 2024, employees put in $1.53 for every $1.00 the employer contributed; active participation has shrunk from 5,003 to 4,289 since 2022.