| 2005 | May | Company Established with 15 million Yen Capital and 6 Employees (including executives). |
| 2006 | Apr | Increased stated capital to 40 million Yen. |
| May | Started Solution business which offers Human Resource |
| 2007 | Feb | Started providing MASAYA GAMES at Nintendo's Virtual Console on Wii. |
| May | Entitled as a charged employment placement service operator. |
| 2008 | Sep | “Moe Mahjong Pairon” service started |
| 2009 | Mar | Started Masaya Games services on SCE's "Game Archives". |
| Mar | Released a PSP software "Zero Cho-Aniki" (Published by GungHo Online Entertainment, Inc.) | |
| Dec | Launched "Extreme Channel" on YouTube |
| 2010 | Apr | Started "Moe Mahjong Pyron" mobile |
| 2011 | Nov | Started servicing “Moe Mahjong Pairon” in Taiwan and other regions such as Hong Kong, Singapore and Malaysia (2012) |
| 2012 | Apr | Established President's Award for employees. |
| 2013 | Sep | Held the First Extreme Commuting at Enoshima (Regularized afterward) |
| Nov | Launched an official web site for “Uminin” | |
| Dev | Awarded “Job Creation 2013” | |
| Dev | The first official Uminin mobile apps “Tsuminin -Uminin great circus-” for Android and iOS released |
| 2014 | Jun | Co-CORE, the incubation center, open |
| Jun | Nagoya office open | |
| Dec | Awarded “Job Creation 2014” | |
| Dec | IPO on MOTHERS (Market of The High-growth and Emerging Stocks) of Tokyo Stock Exchange (Stock ticker number: 6033) |
| 2015 | Jan | Raised the capital to 276 million Yen. |
| Mar | Started “Julia Project”, career supporting project for women | |
| Jun | Over 50 students for Creators and Engineers Training Project NSCA | |
| Jul | Released “Langrisser –Incarnation–“ For Nintendo 3DS | |
| Oct | Awarded “Technology Fast 50 Japan” | |
| Nov | Awarded “Job Creation 2015” | |
| Dec | Released ASSAULT SUITS LEYNOS (Published by DRACUE Co.,Ltd.) for PS4 |
| 2016 | Jan | Conclusion of licensing contract for “Langrisser” mobile apps for overseas |
| Apr | Acquired the system integrator, “Witnest Co.,Ltd,” | |
| Jun | Held the first Client Thanks Day (Annually held afterward) | |
| Sep | Moved to 21F Metropolitan Plaza Bldg, 1-11-1, Nishi-Ikebukuro for larger office space | |
| Sep | In-company “Training Room” open | |
| Oct | Awarded “14th Technology Fast 50 Japan” |
| 2017 | Mar | “Fureai Smile Garden” open in Funabashi city, Chiba prefecture |
| May | Selected as “Growing Company Middle 200” | |
| May | Held the first Staff Assembly (Annually held afterward) | |
| Jun | Revived “Shockman Zero” (published by Columbus Circle) for ROM cassette | |
| Oct | Awarded “the 15th Technology Fast 50 Japan” |
| 2018 | Mar | Held “Cho-Aniki Live Festival” |
| Apr | Absorbed “Witnest Co.,Ltd,” | |
| Apr | Nominated as “Work-Life balance Promoters” by Toshima-ku city office | |
| Apr | Concluded Comprehensive Partnership Agreement with Zephyr, Ikebukuro Town Meeting | |
| May | Acquired the system integrator, “EPARK Technologies,Inc.” | |
| May | Equity-Method applied for “E Pet Life Inc.”（current “EPARK Pet Life Inc.” ） | |
| May | Raised 410 million Yen | |
| May | Incubation center “Shachiho Co-CORE” open at Nagoya office | |
| May | Held Ikebukuro“Digital Terakoya” | |
| Aug | Started servicing “Langrisser Mobile” in China（Since then, rolled out services around the world） |
| 2019 | Apr | Started servicing “Langrisser Mobile” in Japan |
| Jun | Establish joint venture “ex-labo Co.,Ltd.” for Vietnam Offshore Development | |
| Jul | “ex-labo Co.,Ltd.” acquired “ALTPLUS VIETNAM Co.,Ltd.” | |
| Dec | Joined “Keidanren” |
| 2020 | May | Made “ex-labo Co.,Ltd.” a wholly owned subsidiary |
| Jul | Group company “ALTPLUS VIETNAM Co.,Ltd.” renamed to “EXTREME VIETNAM Co.,Ltd.” |
| 2021 | Aug | "Extreme Freelance" Agent business service for freelancers launched |
| Aug | The TV commercial "♪Digital, Taru, Barrel, Extreme♪" was released | |
| Aug | NEXTON Co. Ltd． became an equity-method affiliate |
| 2022 | Apr | Change to the Tokyo Stock Exchange Growth Market |
| Jul | Acquired the system integrator, “DRAGAMI GAMES Co., Ltd.” | |
| Nov | Acquired the system integrator, “SAS CO.,LTD.” |
| 2023 | Apr | Nagoya office moved to Meieki Daiya Meitetsu Bld 5F,1-1-17 Meieki,Nishi-ku,Nagoya-shi for larger office space |
| Aug | New office "Ikebukuro Development Office" opened in the head office building (Metropolitan Plaza Building) |
| 2024 | Dec | Due to business expansion, the 15th floor of the head office building was expanded and the Ikebukuro Development Office was integrated |
| 2025 | Jan | Opened Osaka Sales Office in Osaka City, Osaka Prefecture |
| Jan | Complete renewal of human resources incubation facility “Co-CORE” |
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