| 1948-06 |
Established Saitama Spinning Co., Ltd. in Maekawa-cho, Kawaguchi City, Saitama Prefecture (current location) with capital of 20,000 thousand yen. |
| 1948-06 |
June 1948: Established Saitama Spinning Co., Ltd. in Maegawa-cho, Kawaguchi City, Saitama Prefecture, with capital of 20,000 thousand yen. |
| 1948-06-15 |
Established: June 15, 1948 (Showa 23). |
| 1948-06-15 |
Established Saitama Spinning Co., Ltd. with a capital of 20,000 thousand yen. |
| 1949-03 |
Acquired 5,412 m² of building, 308 looms, and other ancillary equipment from Iiryu Textile Co., Ltd., expanding production. |
| 1949-03 |
March 1949: Acquired 5,412 m² of building, 308 looms, and other ancillary equipment from Iiryu Textiles Co., Ltd., expanding production. |
| 1951-01 |
Opened Osaka branch office. |
| 1951-01 |
January 1951: Opened Osaka branch office. |
| 1951-06 |
Opened Tokyo sales office. |
| 1951-06 |
June 1951: Opened Tokyo sales office. |
| 1952-10 |
Established a second spinning factory within the headquarters plant. |
| 1952-10 |
October 1952: Established a second spinning factory within the head office plant. |
| 1954-02 |
Established the Kannon factory in Negishi, Kawaguchi City, and began manufacturing synthetic fiber spinning. |
| 1954-02 |
February 1954: Established Kannon factory in Negishi, Kawaguchi City, and began manufacturing chemical fiber spinning. |
| 1958-03 |
Installed embroidery lace machines at the Kannon factory and began lace production. |
| 1958-03 |
March 1958: Installed embroidery lace machines at the Kanno factory and began lace production. |
| 1961-10 |
Listed on the Second Section of the Tokyo Stock Exchange. |
| 1961-10 |
October 1961: Listed on the Second Section of the Tokyo Stock Exchange. |
| 1962-06 |
Established Saitama Kogyo Co., Ltd. (now a consolidated subsidiary). |
| 1962-06 |
June 1962: Established Saitama Kogyo Co., Ltd. (now a consolidated subsidiary). |
| 1962-12 |
Established a bedding factory within the headquarters plant and began manufacturing bedding products. |
| 1962-12 |
December 1962: Established a bedding factory within the headquarters plant and began manufacturing bedding products. |
| 1967-02 |
Changed the company name to Saibo Co., Ltd. |
| 1967-02 |
February 1967: Changed the company name to Saibo Co., Ltd. |
| 1969-07 |
Established Tochigi Saibo Co., Ltd. |
| 1969-07 |
July 1969: Established Tochigi Saibo Co., Ltd. |
| 1978-03 |
Separated the Kannon factory and established Kannon Saibo Co., Ltd. (now a consolidated subsidiary). |
| 1978-03 |
March 1978: Separated the Kanno factory and established Kanno Saibo Co., Ltd. (now a consolidated subsidiary). |
| 1978-09 |
Established a trading division. |
| 1978-09 |
September 1978: Established a trading division. |
| 1980-05 |
Established Floria Co., Ltd. (now a consolidated subsidiary). |
| 1980-05 |
May 1980: Established Floria Co., Ltd. (now a consolidated subsidiary). |
| 1981-07 |
Completed the Tokyo branch office building at the current location. |
| 1981-07 |
July 1981: Completed the Tokyo branch office building at its current location. |
| 1982-07 |
Suspended operations of the spinning division. |
| 1982-07 |
July 1982: Suspended operations of the spinning division. |
| 1984-04 |
Completed the large shopping center 'Former Aeon Mall Kawaguchi' in Kawaguchi City and began leasing. |
| 1984-04 |
April 1984: Completed the large shopping center 'Former Aeon Mall Kawaguchi' in Kawaguchi City and began leasing. |
| 1990-11 |
Expanded and began leasing the former Aeon Mall Kawaguchi, a large shopping center in Kawaguchi City. |
| 1990-11 |
November 1990: Expanded the large shopping center 'Former Aeon Mall Kawaguchi' in Kawaguchi City and began leasing. |
| 1994-01 |
Established a new BP (Body Repair and Painting) plant and began automotive sheet metal painting. |
| 1994-01 |
January 1994: Established a BP (Body Repair and Painting) plant and began automotive sheet metal painting. |
| 1995-05 |
Established an apparel division. |
| 1995-05 |
May 1995: Established an apparel division. |
| 1997-07 |
Suspended in-house operations of the textile division. |
| 1997-07 |
July 1997: Suspended in-house operations of the textile division. |
| 1998-10 |
Merged Textile Sales Section 1 (textile products) of the textile division with the lace division to form a new textile division, and merged Textile Sales Section 2 (sewn products) with the apparel division, thereby abolishing the textile division. |
| 1998-10 |
October 1998: Merged Textile Sales Section 1 (textile products) of the textile division with the lace division to form a new textile division, and merged Textile Sales Section 2 (sewn products) with the apparel division, thereby abolishing the textile division. |
| 1998-10 |
Merged Textile Sales Section 1 (textile products) of the Textile Division with the Lace Division and established the Textile Division; merged Textile Sales Section 2 (sewn products) with the Apparel Division and abolished the Textile Division. |
| 2000-10 |
Established a new head office building. |
| 2000-10 |
October 2000: Established a new headquarters office building. |
| 2000-11 |
Completed and began leasing the large shopping center 'Aeon Mall Kawaguchi Maekawa' on the company’s premises. |
| 2000-11 |
November 2000: Completed the large shopping center 'Aeon Mall Kawaguchi Maegawa' on the headquarters site and began leasing. |
| 2002-08 |
Commenced greening projects (Diagrine Cyber Co., Ltd.). |
| 2002-08 |
August 2002: Started a greening business (Diagrine Saibo Co., Ltd.). |
| 2004-02 |
Stopped production at the head office upholstery factory. |
| 2004-02 |
February 2004: Production at the headquarters bedding factory ceased. |
| 2004-05 |
Established Sai Bo (Shanghai) Trading Co., Ltd. |
| 2004-05 |
May 2004: Established Saiho (Shanghai) Trading Co., Ltd. |
| 2005-04 |
Relocated the BP plant to Iwakuni and commenced operation using the Toyota Production System. |
| 2005-04 |
April 2005: Moved the BP factory to Iwataki and began operation using the Toyota Production System. |
| 2005-07 |
Merged the textile division into the apparel division. |
| 2005-07 |
July 2005: Merged the textile division into the apparel division. |
| 2006-05 |
Established an internal control office. |
| 2006-05 |
May 2006: Established the Internal Control Office. |
| 2007-10 |
Unified the company's fiber division and established a fiber business headquarters. |
| 2007-10 |
October 2007: Unified the company's textile division and established the Textile Business Headquarters. |
| 2007-11 |
Expanded and began leasing the large shopping center 'Aeon Mall Kawaguchi Maekawa' on the company’s premises. |
| 2007-11 |
November 2007: Expanded the large shopping center 'Aeon Mall Kawaguchi Maegawa' on the headquarters grounds and began leasing. |
| 2008-10 |
Implemented the company-wide unified computing system 'SAP-ERP package'. |
| 2008-10 |
October 2008: Implemented the company-wide unified IT system 'SAP ERP Package'. |
| 2011-03 |
Absorbed Diagrine Cyber Co., Ltd. into the company, discontinued the Living Division (former upholstery division), and closed the Osaka branch office. |
| 2011-03 |
March 2011: Absorbed Diagreen Cybo Co., Ltd. into the company, discontinued the Living Division (former bedding division), and closed the Osaka branch office. |
| 2013-04 |
Transferred the automotive sheet metal painting repair business to the affiliated company Toyota Higashi Saitama Group Co., Ltd. (formerly NT Works Co., Ltd.). |
| 2013-04 |
April 2013: Transferred the automotive body painting and repair business to the affiliated company Toyota Higashi-Saitama Group Co., Ltd. (formerly NT Works Co., Ltd.). |
| 2013-10 |
Discontinued the automotive driving school business of Saitama Kogyo Co., Ltd. |
| 2013-10 |
October 2013: Discontinued the automotive driving school business of Saitama Kogyo Co., Ltd. |
| 2014-04 |
Transferred the lace business of Tochigi Cyber Co., Ltd. to Floria Co., Ltd. |
| 2014-04 |
April 2014: Transferred the racing business of Tochigi Cybo Co., Ltd. to Floria Co., Ltd. |
| 2014-12 |
Tochigi Cyber Co., Ltd. was liquidated. |
| 2014-12 |
December 2014: Liquidated Tochigi Cybo Co., Ltd. |
| 2015-10 |
Acquired Nihon U Industries Co., Ltd. (currently a consolidated subsidiary). |
| 2015-10 |
October 2015: Acquired Nissui Industries Co., Ltd. (now a consolidated subsidiary). |
| 2015-11 |
Kawaguchi Heart and Respiratory Hospital was completed and began leasing. |
| 2015-11 |
November 2015: Completed construction of Kawaguchi Heart and Respiratory Hospital and began leasing. |
| 2018-01 |
Transferred business of Saibou (Shanghai) Trading Co., Ltd. |
| 2018-01 |
January 2018: Transferred the business of Saiho (Shanghai) Trading Co., Ltd. |
| 2018-09 |
Ended lease agreement for former Aeon Mall Kawaguchi. |
| 2018-09 |
September 2018: Terminated the lease agreement for the former Aeon Mall Kawaguchi. |
| 2019-08 |
Commenced construction of Aeon Mall Kawaguchi. |
| 2019-08 |
August 2019: Commenced construction of Aeon Mall Kawaguchi. |
| 2020-03 |
Discontinued the Casual division business. |
| 2020-03 |
March 2020: Discontinued the casual division business. |
| 2020-04 |
Established the Outdoor division. |
| 2020-04 |
Kawaguchi Ladies Clinic was completed and began leasing. |
| 2020-04 |
April 2020: Established the outdoor division. |
| 2020-04 |
April 2020: The Kawaguchi Ladies Clinic was completed and began leasing. |
| 2021-03 |
Discontinued the greening business. |
| 2021-03 |
March 2021: The greening project was discontinued. |
| 2021-05 |
Aeon Mall Kawaguchi, a large shopping center in Kawaguchi City, was completed and began leasing. |
| 2021-05 |
May 2021: The large shopping center 'Aeon Mall Kawaguchi' in Kawaguchi City was completed and began leasing. |
| 2021-09 |
Medipark Kawaguchi Maegawa II, a medical facility in Kawaguchi City, was completed and began leasing. |
| 2021-09 |
September 2021: The medical facility 'Medipark Kawaguchi Maegawa II' in Kawaguchi City was completed and began leasing. |
| 2022-04 |
Transitioned from the Second Section to the Standard Market due to a review of market classification at the Tokyo Stock Exchange. |
| 2022-04 |
April 2022: Moved from the Second Section to the Standard Market due to a review of market classifications by the Tokyo Stock Exchange. |
| 2022-04-19 |
Announcement regarding the establishment of a subsidiary and the commencement of new business. |
| 2022-04-19 |
Announcement regarding the appointment of external director candidates. |
| 2022-04-19 |
Moved from the Second Section to the Standard Market due to a review of market classifications by the Tokyo Stock Exchange. |
| 2022-05 |
Established Cyber Create Co., Ltd. (currently a consolidated subsidiary). |
| 2022-05 |
May 2022: Established Cyber Create Co., Ltd. (now a consolidated subsidiary). |
| 2025-12 |
Liquidated and closed Floria Co., Ltd. |
