- ADEY Professional Heating Solutions
 - Adeya
 - Adeyoh
 - ADF Solutions
 - AdFácil
 - Adfairs
 - AdFalcon
 - AdFender
 - Adfenix
 - AdFi
 - AdFicient
 - Adfiki
 - AdFin
 - Adfinis SyGroup
 - ADfits
 - adflecto
 - Adflex
 - AdFlight
 - ADFLOW NETWORKS
 - Adflute
 - adflyer
 - Adfo Groep
 - Adfora
 - Adforce
 - Adforce Belgium
 - AdForge
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 - ADFRIES RTB
 - Adfun
 - AdFury
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 - ADG
 - AdGaem
 - AdGenie
 - AdGent Digital
 - Adgero Biopharmaceuticals
 - Adgistics
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 - AdGreetz
 - Adgregate Markets
 - Adgully
 - AdGyde
 - ADH Labs
 - AdHack
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 - AdHawk
 - AdHawk Microsystems
 - Adheaven
 - Adhere Creative
 - Adhere Industrial Tapes
 - Adherence Compliance
 - Adherex Technologies
 - Adherial
 - Adheron Therapeutics
 - Adhese
 - Adhesion Group
 - Adhesion Wealth Advisor Solutions
 - Adhezion Biomedical
 - Adhit
 - AdHitz
 - AdHive
 - Adhoco
 - Adhocspace
 - Adhomadhoo
 - AdHome
 - Adhril
 - adHub
 - adHUBS
 - AdHuge
 - Adhunk
 - Adhusky
 - AdHut Media
 - Adhysteria
 - ADI Corporation
 - ADI Engineering
 - ADI Global
 - ADI Strategies
 - ADI Time
 - Adia Digital Art Co
 - Adia Tech
 - Adial Pharmaceuticals
 - Adiam
 - Adiana
 - adiante apps
 - ADIC (Advanced Digital Information)
 - Adicet Bio
 - Adicio
 - Adictiz
 - AdiCyte
 - Adido
 - Adience
 - ADIency
 - Adient Health
 - Adient Medical
 - Adifo N.V.