A
- Ace Line Hauler
- Acme United Corporation
- ACR Electronics
- Adco
- Airxcel - Maxxair
- Airhead
- Alloy USA
- Amack
- Ambassador Associated Marine Concepts
- Amerex Fire
- American Fishing Wire
- Ameron / Devoe
- AMI
- Ancor
- Anderson Marine
- Angler's Choice
- Angler's Pal
- Ansell Edmont
- AP Products
- Apex Tool Group
- API Marine
- Aqua Signal Corporation
- Aqua-Pacific
- Aqualarm
- Arco
- Arco Marine
- Arctic Ice
- Artech Sinrud Industries
- Artis Products
- ASA Electronics
- Ashaway
- Atlas Glove
- Attwood
- Attwood / Seaward
- Atwood (Dometic)
- Atwood Rope MFG
- Avet Reels
- AWAB
- Awlgrip
- Alto Products
- Asano
- Auto Anchor
- Abelltek
- Ande Line
- ABU Garcia
- Anderson
- Alpha Systems