Thayer Engineering Co.

Mark Charest signed Thayer Engineering Co.'s 2025 Form 5500 as plan administrator.

• Mark Charest — Plan Administrator — Form 5500 signer

Signer names are public record from the Form 5500 e-signature.

Thayer Engineering Co.'s EIN is 01-0399209.

Download the official 2025 Form 5500 (PDF) for Thayer Engineering Co. from the U.S. Department of Labor's EFAST2 system.

Thayer Engineering Co.'s plan includes ERISA 404(c) participant direction, a default investment (QDIA), a 401(k) feature, profit-sharing.