# 12 31 09

Business profile: public business information with links to supporting state records. Data as of October 16, 2026.

- Legal business name: 12 31 09
- Alternative and DBA names: Ralph J. Stephenson, P.E., P.C.
- Entity type: Professional corporation
- Original incorporation date: July 1, 1980
- Time in business: 46 years and 3 months
- Jurisdiction count: 1

## All known addresses

- 323 Hiawatha Dr, Mount Pleasant, MI 48858 (listed in Michigan)

## Registered states

- [Michigan](https://index.baselayer.com/mi/ec355b7ef079e501): Domestic registration

Source: public state registration records. Missing values are not a negative finding.

Cite as: Baselayer Business Index (https://index.baselayer.com/business/ec355b7ef079e501)