Brands
- SEM
- Sensar Marine
- Shakespeare
- SHOCK-WBV
- Shurhold
- Shurtape
- SI-TEX
- Sika
- Simmons
- Simrad
- Siren Marine
- SmartPlug
- Smoove
- Solstice Watersports
- Speco Tech
- Springfield Marine
- STA-BIL
- Standard Horizon
- Stay Afloat
- Stearns
- Steiner Optics
- StrikeMaster
- Sudbury
- Sufix
- Super Lube
- Super Stainless
- SureShade
- Swobbit
- T-H Marine Supplies
- TACO Marine
- TAILFIN
- Tasco
- Taylor Made
- Tecnoseal
- The Snubber
- Thetford Marine
- Timex
- Tip Top Teak
- Toadfish
- TOON KICKER