History
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| 2026 | January | Merged with Acclimate Inc. and Centan Inc. |
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| 2025 | June | Delisted from the prime market |
| April | CITATION JAPAN CO., LTD. becomes a consolidated subsidiary. | |
| 2024 | July | Acquired 100% of the shares of M-Force Inc. and made it a consolidated subsidiary. Changed the company name (trade name) of H.M. Marketing Research, Inc. to QO,Inc. |
| January | Monitas, Inc. into a wholly owned subsidiary. | |
| 2023 | August | Converted Monitas, Inc. into a consolidated subsidiary. |
| June | MetrixLab Group is transferred to Toluna, and Toluna's stock is acquired and becomes an equity method affiliate. | |
| 2022 | May | Data consulting business is spun off and integrated into SOUTH Inc. and 71% of the company's stock is acquired to make it a subsidiary, and the company's name is changed to Eight Hundred, Inc. |
| April | Acquired 100% of the shares of Acclimate Inc. and made it a consolidated subsidiary. | |
| 2021 | July | Renewed Group Vision |
| 2020 | July | Macromill Embrain Co., Ltd. (Korea) listed on the KOSDAQ market. |
| January | Macromill Consortium established. | |
| January | Merged with M-PROMO Co. | |
| 2019 | July | W&S Holdings Co., Ltd. changed its name to Macromill South East Asia, Inc. |
| March | Acquired additional shares of W&S Holdings Co., Ltd. and made it a subsidiary (51% ownership) | |
| January | Launched AI analysis service jointly with NEC Corporation. | |
| 2018 | October | Tokyo Survey Research Inc. changed its name to H.M. Marketing Research, Inc. |
| July | Acquires 51% of the shares of Tokyo Survey Research Inc. and makes it a subsidiary | |
| January | Acquired additional shares of Centan Inc. and made it a subsidiary (held by 51%) | |
| 2017 | October | Acquisition of shares of U.S. corporation Acturus, Inc. to make it a wholly owned subsidiary |
| September | Formed business and capital alliance with W&S Holdings Co., Ltd. | |
| March | Relisted on the First Section of the Tokyo Stock Exchange | |
| January | Business and capital tie-up with Centan Inc. | |
| 2016 | July | Macromill Group as a whole Mission, Vision, Values formulated |
| April | Unified corporate logo design for Macromill Group companies Market research media "HoNote" is released. |
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| 2015 | October | Started joint research with Waseda University Data Science Institute |
| April | Launched data collection and provision of services for MHS, a household panel survey. Announced the establishment of new offices in Singapore and Mexico |
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| March | Business alliance with Nikkei Research | |
| February | Launched "Milltalk", a user-talk service. | |
| 2014 | December | Macromill Carenet, Inc. is established as a joint venture with CareNet,Inc. |
| October | Acquired shares of MetrixLab B.V., a Dutch corporation, and made it a wholly owned subsidiary. | |
| September | Launched "AccessMill," an online activity log data x survey service. | |
| April | Delisting from the First Section of the Tokyo Stock Exchange | |
| 2013 | December | Acquires 51% of Dentsu Marketing Insight shares to make it a subsidiary and decides to change its name to Dentsu Macromill Insight, Inc. |
| October | Launched the self-survey tool "Questant" | |
| April | Misecolle Inc. established and "Misecolle" service begins. | |
| 2012 | August | Merged the Korean subsidiaries Embrain and Macromill Korea, Company name changed to Macromill Embrain. |
| March | Dentsu Macromill is established as a joint venture with Dentsu Marketing Insight Inc. Establishment of M-PROMO Co. |
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| February | Acquired 51% stake in South Korean research firm Embrain, making it a subsidiary. | |
| 2011 | April | Established a new company in China, Macromill China (Ming Road Market Research (Shanghai) Co. Merged with Brand Data Bank, Inc. |
| January | M-CUBE and Associates Inc. established (nowM-CUBE, INC.) | |
| 2010 | August | Took over the marketing research business of Yahoo Value Insight Corporation. |
| 2009 | October | Becoming a wholly owned subsidiary of Brand Data Bank, Inc. |
| May | Macromill Korea started operations in South Korea. | |
| 2008 | July | Established a new company, Macromill Korea Co. |
| 2007 | December | "QPR™", a consumer purchase history data service |
| 2005 | July | Joined the Japan Business Federation (Keidanren) Acquired shares of AIP Corporation and made it a subsidiary |
| April | Listed on the First Section of the Tokyo Stock Exchange | |
| February | Launched GlobalMill service. | |
| January | Joined Keizai Doyukai (Japan Association of Corporate Executives) | |
| 2004 | April | Net Research Institute (now Macromill Research Institute) established. |
| February | Kansai Branch established in Honmachi, Chuo-ku, Osaka | |
| January | Listed on the Tokyo Stock Exchange MOTHERS Acquired Privacy Mark |
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| 2003 | March | Ranked 10th in the unlisted company category of Nikkei Venture's "Venture of the Year 2002 |
| 2002 | December | Joined the Japan Marketing Research Association |
| 2001 | December | Company name (trade name) changed to Macromill, Inc. |
| 2000 | August | Automated Internet Research System "AIRs" Cutover Launched "QuickMill" and "OpenMill" services |
| January | Established Macromill.com, Inc. |