- WatchGuard Technologies
- Watchguide
- Watchinga
- Watchity
- Watchlater
- WatchMark
- WatchMark-Comnitel
- WATCHMASTER
- WatchMe88
- WatchMeGrow
- watchMEmelt
- WatchMojo
- WatchMouse
- WatchMyBit
- Watchmynumbers
- Watchnatic
- WatchParty
- Watchplate
- WatchPoint Media
- Watchr
- Watchrr
- WatchRx
- Watchsend
- Watchshop
- Watchstone
- WatchSumo
- WatchTime
- WatchTower & Friends
- Watchup, Inc.
- Watchville
- Watchwith
- Watchy
- WatchYou
- WATConsult
- Wateen Telecom
- Water & Energy Systems Technology
- Water Babies
- Water Bucket
- Water Closet Games
- Water Damage Defense
- Water Earth Air & Space
- Water Generating Systems
- Water Hero
- Water Innovate
- Water Kleen Services
- Water Lens
- Water Science Technologies
- Water Street Healthcare Partners
- Water Strider
- Water Surveillance
- Water Zone Technologies
- water&stone
- WATER-STREAM
- WaterBear Soft
- Waterbergh Management
- WaterBit
- Waterbottles
- Waterbury Companies - CB Professional Products line of insect control products
- WaterClub
- Watercove Networks
- WATERDOG mobile
- Waterdog Technologies
- Waterfall
- Waterfall International
- Waterfall Security Solutions
- Waterfi
- Waterfox
- WaterFX
- WaterGenie
- WaterHouse Projects
- Waterio
- Waterland Private Equity
- Waterline Data
- Waterloo Innovation Network
- Waterloo Manufacturing Software
- Waterloo Maple Inc.
- Waterloo Region Record
- Watermark Software
- Watermeadow Medical
- Watermelon Messenger
- WaterMyBlog
- WaterO
- Wateroom
- Waterpark
- WaterProof SARL
- WaterproofiPodCasenet
- Waters
- Waters McPherson McNeill PC
- Watershed
- Watershed Investment Consultants
- Watershed Strategies LLC
- Watershed Systems
- WaterSmart Software
- Waterstone Financial
- Waterstone Pharmaceuticals
- WaterSuite
- Waterton
- Waterton Global Resource Management
- WaterTower Research