As of February 2009, the Nikkei 225 stock index includes the following two hundred and twenty-five companies:
- Ajinomoto
- Asahi Breweries
- Japan Tobacco
- Kikkoman
- Kirin Brewery
- Meiji Dairies
- Meiji Seika Kaisha
- Nichirei
- Nippon Meat Packers
- Nisshin Seifun Group
- Sapporo Holdings
- Takara Holdings
- Kuraray
- Mitsubishi Rayon
- Nisshinbo Industries
- Teijin
- Toray Industries
- Toyobo
- Unitika
- Hokuetsu Paper Mills
- Mitsubishi Paper Mills
- Nippon Paper Group
- Oji Paper
- Asahi Kasei
- Denki Kagaku Kogyo K.K.
- Fujifilm Holdings
- Kao
- Mitsubishi Chemical Holdings
- Mitsui Chemicals
- Nippon Kayaku
- Nippon Soda
- Nissan Chemical Industries
- Shin-Etsu Chemical
- Shiseido
- Showa Denko K.K.
- Sumitomo Chemical
- Tosoh
- Ube Industries
- Astellas Pharma
- Chugai Pharmaceutical
- Daiichi Sankyo
- Dainippon Sumitomo Pharma
- Eisai
- Kyowa Hakko Kirin
- Shionogi &
- Takeda Pharmaceutical Company
- Nippon Mining Holdings
- Nippon Oil
- Showa Shell Sekiyu K.K.
- Bridgestone
- The Yokohama Rubber
- Asahi Glass
- NGK Insulators
- Nippon Sheet Glass
- Nitto Boseki
- Sumitomo Osaka Cement
- Taiheiyo Cement
- Tokai Carbon
- Toto
- JFE Holdings
- Kobe Steel
- Nippon Steel
- Pacific Metals
- Sumitomo Metal Industries
- Dowa Holdings
- Fujikura
- Furukawa
- The Furukawa Electric
- Mitsubishi Materials
- Mitsui Mining & Smelting
- Nippon Light Metal
- SUMCO
- Sumitomo Electric Industries
- Sumitomo Metal Mining
- Toho Zinc
- Toyo Seikan Kaisha
- Chiyoda
- Daikin Industries
- Ebara
- Hitachi Construction Machinery
- Hitachi Zo-sen Corporation
- IHI
- The Japan Steel Works
- JTEKT
- Komatsu
- Kubota
- Mitsubishi Heavy Industries
- NSK
- NTN
- Okuma Holdings
- Sumitomo Heavy Industries
- Advantest
- Alps Electric
- Canon
- Casio Computer
- Clarion
- Denso
- Fanuc
- Fuji Electric Holdings
- Fujitsu
- GS Yuasa
- Hitachi
- Kyocera
- Panasonic
- Panasonic Electric Works
- Meidensha
- Minebea
- Mitsubishi Electric
- Mitsumi Electric
- NEC
- Oki Electric Industry
- Pioneer Corporation
- Sanyo Electric
- Sharp
- Sony
- Taiyo Yuden
- TDK
- Tokyo Electron
- Toshiba
- Yokogawa Electric
- Kawasaki Heavy Industries
- Mitsui Engineering & Shipbuilding
- Fuji Heavy Industries
- Hino Motors
- Honda Motor
- Isuzu Motors
- Mazda Motor
- Mitsubishi Motors
- Nissan Motor
- Suzuki Motor
- Toyota Motor
- Citizen Holdings
- Konica Minolta Holdings
- Nikon
- Olympus
- Ricoh
- Terumo
- Dai Nippon Printing
- Hoshizaki Electric
- Toppan Printing
- Yamaha
- Nippon Suisan Kaisha
- Inpex
- Comsys Holdings
- Daiwa House Industry
- JGC
- Kajima
- Obayashi
- Sekisui House
- Shimizu
- Taisei
- Itochu
- Marubeni
- Mitsubishi
- Mitsui
- Softbank
- Sojitz
- Sumitomo
- Toyota Tsusho
- Aeon
- Fast Retailing
- Isetan Mitsukoshi Holdings
- J. Front Retailing
- Marui Group
- Seven & I Holdings
- Takashimaya
- Uny
- The Bank of Yokohama
- The Chiba Bank
- Chuo Mitsui Trust Holdings
- Fukuoka Financial Group
- Mitsubishi UFJ Financial Group
- Mizuho Financial Group
- Mizuho Trust & Banking
- Resona Holdings
- Shinsei Bank
- The Shizuoka Bank
- Sumitomo Mitsui Financial Group
- The Sumitomo Trust and Banking
- Daiwa Securities Group
- Matsui Securities
- Nomura Holdings
- Shinko Securities
- Mitsui Sumitomo Insurance Group Holdings
- Sompo Japan Insurance
- T&D Holdings
- Tokio Marine Holdings
- Credit Saison
- Heiwa Real Estate
- Mitsubishi Estate
- Mitsui Fudosan
- Sumitomo Realty & Development
- Tokyu Land
- East Japan Railway Company
- Keio
- Keisei Electric Railway
- Odakyu Electric Railway
- Tobu Railway
- Tokyu
- West Japan Railway Company
- Nippon Express
- Yamato Holdings
- Kawasaki Kisen Kaisha
- Mitsui O.S.K. Lines
- Nippon Yusen K.K.
- All Nippon Airways
- Japan Airlines
- Mitsubishi Logistics
- KDDI
- Nippon Telegraph and Telephone
- NTT Data
- NTT DoCoMo
- Sky Perfect JSAT Holdings
- Chubu Electric Power
- The Kansai Electric Power
- The Tokyo Electric Power
- Osaka Gas
- Tokyo Gas
- CSK Holdings
- Dentsu
- Konami
- Secom
- Tokyo Dome
- Toho
- Trend Micro
- Yahoo Japan
