Open Up Group Co., Ltd.

Established Sato Architectural Design Office Ltd. in September 1976.

Established Sato Architectural Design Office

Initiated formation of overseas network for construction drawings in April 1985.

Worked on the development of overseas network to prepare working drawings

Started ordering construction drawings from overseas design offices in April 1987.

Started construction engineer dispatch business in March 1991.

Established Kyosei Sangyo Co., Ltd., a company employing persons with disabilities, in August 1997 (now the company).

Kyousei Sangyou Inc. established to employ persons with disabilities

Listed on Tokyo Stock Exchange JASDAQ in September 2003.

Started personnel services business and changed company name to TrustWorks Sanei Co., Ltd. in November 2004.

Staffing services business launched and company name changed to Trust Works Sanei Inc.

Organized as holdings and established Dreamma Co., Ltd. as a business succession company in April 2005.

Engineer staffing services company Trust Tech Inc. acquired and made into subsidiary

Company name changed to Trust Works Inc.

Listed on JASDAQ Securities Exchange

Merged Dreamma Holdings Co., Ltd. and Dreamma Co., Ltd. in October 2007.

Absorbed subsidiary Trust Tech Co., Ltd. and changed company name to Trust Tech Co., Ltd. in October 2008.

Merged with subsidiary Trust Tech Inc. in an absorption-type merger and company name changed to Trust Tech Inc.

Made TTM Co., Ltd., a manufacturing dispatch company, a subsidiary in March 2009.

Manufacturing staffing services company TTM Inc. acquired and made into subsidiary

Made Hong Kong Huo Su Technology Co., Ltd. (HKTT Limited) a subsidiary in June 2010.

KTT Limited acquired and made into subsidiary

Changed market to Second Section of Tokyo Stock Exchange in August 2013.

Listed on Second Section of Tokyo Stock Exchange

In December 2013, moved to the First Section of the Tokyo Stock Exchange.

Listed on First Section of Tokyo Stock Exchange

In October 2014, the number of active engineers in the group exceeded 2,000.

In November 2014, the headquarters moved to Marunouchi, Tokyo.

Indonesia representative office established by subsidiary HKTT Limited

Technical Solutions Division of Technology Power Corporation transferred to Trust Tech Inc. : Freedom Co., Ltd. acquired and made into subsidiary

In August 2015, the number of active engineers in the group exceeded 3,000.

Trust Ideal Inc. (formerly Kanamoto Engineering Co., Ltd.) acquired and made into subsidiary

UK-based staffing services company MTrec Limited acquired and made into subsidiary

Shanghai local subsidiary established by subsidiary HKTT Limited

Merged with subsidiary Trust Ideal Inc. in an absorption-type merger : Shandong Trust-Bridge Human Resource Inc. established as joint venture

In November 2016, the number of active engineers in the group exceeded 4,000.

Special subsidiary name changed to Trust Tech With Inc. : FUSIONi Co., Ltd. acquired and made into subsidiary

In July 2017, the number of active engineers in the group exceeded 5,000.

Guangzhou Trust Dianmi Human Resources Inc. established as joint venture

In December 2017, the number of active engineers in the group exceeded 6,000.

Staffing services company Gap Personnel Holdings Limited of UK acquired and made into subsidiary

IT and software services business of Trust Tech Inc. transferred to subsidiary FUSIONi Co., Ltd. and company name changed to Trust iPowers Inc.

Subsidiary Freedom Co., Ltd. integrated with its group companies (System One Co., Ltd. and ECS Co., Ltd., etc.) and company name changed to Trust NEXT Solutions Co., Ltd.

In June 2018, announced the establishment of a shareholder benefit program.

Staffing services company Quattro Group Holdings Limited of UK acquired and made into subsidiary

In September 2018, the number of active engineers in the group exceeded 7,000, and Dream Global Co., Ltd. was established.

In October 2018, Neplus Co., Ltd. was made a wholly‑owned subsidiary.

In January 2019, Dream Technology Co., Ltd. was made a wholly‑owned subsidiary.

Shares of L&A Investment Corporation, the parent company of a major Vietnamese staffing company, acquired and the corporation made into equity-method affiliate

In April 2019, Information Port Co., Ltd. was made a subsidiary, and Samurai Co., Ltd. (now SAMURAI Co., Ltd.) was made a subsidiary.

In May 2019, the number of active engineers in the group exceeded 8,000.

In July 2019, Garenet Co., Ltd. was made a subsidiary.

Subsidiary Trust NEXT Solutions Co., Ltd. name changed to BeNEXT Solutions Inc.

In October 2019, transitioned to a pure holding company structure.

Axis Create Inc., Faith Inc., and Axis Human Development Inc. acquired and made into subsidiaries

In December 2019, the number of active engineers in the group exceeded 9,000.

Transitioned to holding company structure and name changed to BeNEXT Group Inc. : Engineer staffing services business transferred to subsidiary BeNEXT Technologies Inc. (established in July 2019) : Subsidiary TTM Inc. name changed to BeNEXT Partners Inc. : Trust Tech With Inc. name changed to BeNEXT With Inc.

In April 2020, Kurun Tape Co., Ltd. and Sanrit Machinery Design Co., Ltd. merged and renamed to Dream Pro Eng Co., Ltd.

Merger of Kurun Tape Co., Ltd. and Sanrit Machinery Design Co., Ltd., renamed to Dream Pro Engineer Co., Ltd.: Acquisition of Arrow Information Co., Ltd. as a subsidiary.

In September 2020, Dream Global Co., Ltd. absorbed Dream Technology Co., Ltd. as the surviving company.

In January 2021, Alo Trust Systems Co., Ltd. was made a subsidiary.

Arrow Trust Systems Co., Ltd. acquired and made into subsidiary

In January 2023, the company name was changed to Open Up Group Co., Ltd.

In December 2023, Neplus Co., Ltd.'s network equipment rental and sales business was transferred to Kissei Com Tech Co., Ltd.

In April 2024, all shares of BeNex Partners Inc. were transferred to UT Group Co., Ltd.

In April 2024, all shares of UT Technology Co., Ltd. and UT Construction Co., Ltd. were acquired and incorporated as subsidiaries.

UT Technology Co., Ltd. was renamed OpenUp Technology Co., Ltd., and UT Construction Co., Ltd. was renamed OpenUp Construction Co., Ltd.

In October 2024, IR Co., Ltd. was incorporated as a subsidiary.

Part of OpenUp Technology Co., Ltd.'s business was split and absorbed into BeNex Technologies Co., Ltd. and OpenUp IT Engineer Co., Ltd. Additionally, the company was absorbed into BeNex Solutions Co., Ltd.

In July 2025, the management integration of OpenUp Systems Co., Ltd. and AeroTrust Systems Co., Ltd. made the IT development domain part of OpenUp Systems Co., Ltd.

In January 2026, Yumeshima Co., Ltd. was merged into OpenUp Construction Co., Ltd. as the surviving company, becoming OpenUp Construction Co., Ltd.

In April 2026, BeNex Technologies Co., Ltd. was renamed OpenUp Next Engineer Co., Ltd., BeNex Solutions Co., Ltd. was renamed OpenUp Solutions Co., Ltd., and Yumeshima Expert Co., Ltd. was renamed OpenUp Expert Co., Ltd.