Publisher / Manufacturer
- A-forum
- A-FORUM INC.
- A-GRIO
- A-KAGURA
- A-label
- A-One
- A-Toys
- A-WAGON
- A-WAGON R
- A-Works
- A.D.A.Edita Tokyo
- A.MUSEUM
- A.P.P.P
- A.R.T
- A3
- Aaron Field
- abbi
- ABC出版
- Abies 3
- ABIKA
- ABLE CORP.
- Absord Music Japan
- ABYstyle Studio
- AC Books
- ACADEMY
- ACCESS
- Accutone
- ACG
- ACG
- ACJマガジンズ
- Acos
- ACOUSTIC REVIVE
- Acquire
- ACT Corporation
- Act Zero
- ACTION MAN
- Action Toys
- Activation Japan
- Activision
- Activision Publishing Inc.
- ACTOYS
- ACクリエイト株式会社/AC Books
- Ad Good
- Ad Re Nara Izu
- ADATA
- addict Records
- ADDICTION
- AddTron Technology
- ADERIA
- adFunture
- ADIDAS
- ADK Emotions
- ADK南三陸町復興支援プロジェクト
- Adlers Nest
- Adlers Nest
- ADMIRAL
- Adoba Pictures
- ADP
- Adtec
- ADパートナー
- AEJEX
- AEONAZ
- Aerobase
- AFA
- AFORCE
- AForce
- AFV CLUB
- AG
- AG
- AGA
- AGATSUMA
- Agent Con-Sipio
- Ah Tomakukurieito
- Ai digital publishing
- Ai Entertainment Inc
- Ai Planning
- AI-M Bunko
- AICT(国際演劇評論家協会)日本センター
- AICT日本セ
- AID
- Aikuri Henshubu
- AIM AT ENTERTAINMENT
- Air Mail
- air-J
- Aircontrol
- Aircontrol
- Airforward
- AIRS JAPAN
- AIRTEX
- AISC
- aiwasyokuhinnkabusikigaisya
- AIZE PROJECT
- Aizu
- Aja Records
- Ajinomoto
- Aka Sick Library
- Ake
- Aketa
- Akia
- Akiba Shobo