- Adornus Manufacturing
- AFL
- Alice Manufacturing Company
- Alpha Sheet Metal Works
- AME Fabrication & Design, LLC
- American Chemistry Council
- A.O. Smith Water Products Company
- Anderson UnderBridge
- Andron Stainless
- Arauco North America
- Ascend Performance Materials, LLC
- AstenJohnson, Inc.
- Atlantic Packaging
- Atlantic Tooling and Fabricating Company