| 1948-09-08 |
Founded on September 8, 1948. |
| 1955 |
Established Sakata Factory in the same city (now Toho Sakata Hydrogen Co., Ltd.). |
| 1955-03-03 |
Established Tōhō Acetylene Co., Ltd. in Sakata City, Yamagata Prefecture with capital of 3 million yen: New Sakata factory established in the same city (now Tōhō Sakata Hydrogen Co., Ltd.). |
| 1955-03-03 |
Established Toho Acetylene Co., Ltd. in Sakata City, Yamagata Prefecture with capital of 3 million yen. |
| 1955-03-07 |
March 7, 1955. |
| 1956-12 |
Established Tokyo Factory in Edogawa-ku, Tokyo. |
| 1956-12-12 |
New Tokyo factory established in Edogawa-ku, Tokyo: (Relocated to Urayasu City, Chiba Prefecture in September 1969, discontinued in March 2005). |
| 1957-12 |
Established Koriyama Factory in Koriyama City, Fukushima Prefecture (now Koriyama Sales Office). |
| 1957-12-12 |
New Koriyama factory established in Koriyama City, Fukushima Prefecture (now Koriyama branch office). |
| 1958-03 |
Commenced sales of propane gas, kerosene, and household related appliances. |
| 1958-03-03 |
Commenced sale of propane gas, kerosene, and household appliances. |
| 1958-11 |
Moved headquarters from Sakata City, Yamagata Prefecture to Chuo-ku, Tokyo. |
| 1958-11-11 |
Moved headquarters from Sakata City, Yamagata Prefecture to Chuo-ku, Tokyo. |
| 1959-04 |
Established Sendai Factory in Tagajō City, Miyagi Prefecture (now Sendai Branch). |
| 1959-04-04 |
New Sendai factory established in Tagajo City, Miyagi Prefecture (now Sendai branch). |
| 1961-09 |
Listed on Section 2 of the Tokyo Stock Exchange. |
| 1961-09-09 |
Listed on the Second Section of the Tokyo Stock Exchange: (Delisted in October 1963 due to merger, relisted in January 1964). |
| 1961-11 |
Established Hachinohe Factory in Hachinohe City, Aomori Prefecture (now Hachinohe Branch). |
| 1961-11-11 |
New Hachinohe factory established in Hachinohe City, Aomori Prefecture (now Hachinohe branch). |
| 1962-10 |
Established Niigata Office in Kurose Town, Nishikamihara District, Niigata Prefecture (now Niigata Sales Office). |
| 1962-10-10 |
New Niigata office established in Kurose Town, Nishikamihara District, Niigata Prefecture (now Niigata branch office). |
| 1963-03-07 |
In December 1963, merged with the former Akita Electric Industry Co., Ltd. to change the share capital face value, resulting in the inclusion of the new location in the list of facilities. |
| 1963-12 |
Merged with the former Akita Electric Industry Co., Ltd. because of a change in share par value. |
| 1964-11 |
Established Akita Factory in Akita City, Akita Prefecture (now Akita & Sakata Sales Office). |
| 1964-11-11 |
New Akita factory established in Akita City, Akita Prefecture (now Akita and Sakata branch office). |
| 1965-08 |
Established a Chōban branch office in Iwaki City, Fukushima Prefecture (formerly the Iwaki office, closed in April 2009). |
| 1965-08-08 |
New Jōban branch office established in Iwaki City, Fukushima Prefecture (formerly Iwaki office, discontinued in April 2009). |
| 1966-06 |
Established liquefied oxygen and nitrogen production equipment at Sendai plant (Unit 1). |
| 1966-06-06 |
New liquefied oxygen and nitrogen production equipment established at Sendai factory (Unit 1). |
| 1970-05 |
Established a Chiba sales office in Shirai Town, Imabari District, Chiba Prefecture (now Shirai City) (currently Kanto Sales Office). |
| 1970-05-05 |
New Chiba branch office established in Shirai Town, Imbako District, Chiba Prefecture (now Kanto branch office). |
| 1970-06 |
Updated liquefied oxygen and nitrogen production equipment at Sendai plant (Unit 2). |
| 1970-06-06 |
Updated liquefied oxygen and nitrogen production equipment at Sendai factory (Unit 2). |
| 1970-11 |
Established a Sapporo office in Sapporo City, Hokkaido (currently Sapporo Sales Office). |
| 1970-11-11 |
New Sapporo office established in Sapporo City, Hokkaido (now Sapporo Sales Office) |
| 1973-06 |
Established a North Kanto Sales Office in Ashikaga City, Tochigi Prefecture (closed March 2010). |
| 1973-06-06 |
New North Kanto Sales Office established in Ashikaga City, Tochigi Prefecture (abolished March 2010) |
| 1975-04 |
Established the Sakaida Hydrogen Plant and began hydrogen production (currently Tōhō Sakaida Hydrogen Co., Ltd.). |
| 1975-04-04 |
Established Sakata Hydrogen Plant and began hydrogen production (now Toho Sakata Hydrogen Co., Ltd.) |
| 1975-07 |
Established Tōhō Kōsan Co., Ltd. in Koriyama City, Fukushima Prefecture. |
| 1975-07-07 |
Established Toho Kousan Co., Ltd. in Koriyama City, Fukushima Prefecture |
| 1976-09 |
Established Tōhō Iwate Co., Ltd. in Yawara Town, Shimokita District, Iwate Prefecture. |
| 1976-09-09 |
Established Toho Iwate Co., Ltd. in Yawara Town, Shimokita District, Iwate Prefecture |
| 1988-08 |
Established a Kushiro branch office in Kushiro City, Hokkaido (currently Tōhō Hokkaido Kushiro Sales Office). |
| 1988-08-08 |
New Kushiro Branch established in Kushiro City, Hokkaido (now Toho Hokkaido Kushiro Sales Office) |
| 1991-05 |
Established an Ishikari Sales Office in Ishikari City, Hokkaido (currently Tōhō Hokkaido Ishikari Sales Office). |
| 1991-05-05 |
New Ishikari Sales Office established in Ishikari City, Hokkaido (now Toho Hokkaido Ishikari Sales Office) |
| 1991-10 |
Updated liquefied oxygen, nitrogen, and argon production equipment at Sendai plant to new equipment (Unit 3). |
| 1991-10-10 |
Updated liquefied oxygen, nitrogen, and argon production equipment at Sendai Plant to new equipment (Unit 3) (now Tagajo Plant) |
| 2000-06 |
Established Kita Nihon Acetylene Co., Ltd. in Hachinohe City, Aomori Prefecture. |
| 2000-06-06 |
Established Kita-Nippon Acetylene Co., Ltd. in Hachinohe City, Aomori Prefecture |
| 2000-10 |
Obtained ISO 9001 certification for Sendai plant (now Tagajō plant). |
| 2000-10-10 |
Sendai Plant (now Tagajo Plant) obtained ISO 9001 |
| 2001-01-01 |
Moved Hachinohe Office to Hachinohe City North Inter Industrial Complex |
| 2001-01 |
Moved the Hachinohe office to the Hachinohe North Inter Industrial Complex. |
| 2002-01-01 |
Sakata Hydrogen Plant obtained ISO 9001 |
| 2002-01 |
Obtained ISO 9001 certification for Sakaida Hydrogen Plant. |
| 2003-06 |
Established a Sakaida office in Sakaida City, Yamagata Prefecture (currently Akita & Sakaida Sales Office). |
| 2003-06-06 |
New Sakata Office established in Sakata City, Yamagata Prefecture (now Akita & Sakata Sales Office) |
| 2004-11 |
Moved headquarters to 2-4-10 Higashi-Nihonbashi, Chuo-ku, Tokyo. |
| 2004-11-11 |
Head office moved to 2-4-10 Higashi-Nihonbashi, Chuo-ku, Tokyo |
| 2005-01-01 |
Sendai Plant (now Tagajo Plant) (affiliated organization: Toho Sakata Hydrogen) obtained ISO 14001 |
| 2005-01 |
Obtained ISO 14001 certification for Sendai plant (now Tagajō plant) (affiliated organization: Tōhō Sakaida Hydrogen). |
| 2008-04 |
Moved Sales Headquarters to Aoba-ku, Sendai City, Miyagi Prefecture. |
| 2008-04-04 |
Sales Headquarters moved to Aoba-ku, Sendai City, Miyagi Prefecture |
| 2008-10 |
Establishment of Tohoku Hokkaido Co., Ltd. |
| 2008-10-10 |
Established Toho Hokkaido Co., Ltd. |
| 2009-04 |
Establishment of Tohoku Fukushima Co., Ltd. |
| 2009-04-04 |
Established Toho Fukushima Co., Ltd. |
| 2012-12 |
Construction of a new headquarters building in Tagajo City, Miyagi Prefecture, consolidating the head office (management and sales divisions) into the new building. |
| 2012-12 |
Relocation of the main office to 16-13 Nihonbashi 2-chome, Chuo-ku, Tokyo. |
| 2012-12-12 |
Constructed a new headquarters building in Tagajo City, Miyagi Prefecture, consolidating the headquarters (management and sales) into the new building: Head office moved to 2-16-13 Nihonbashi, Chuo-ku, Tokyo |
| 2014-06 |
Relocation of the main office to 3-32 Sakae 2-chome, Tagajo City, Miyagi Prefecture (official registration of the main office relocation). |
| 2014-06-06 |
Head office moved to 3-32-32 Sakae, Tagajo City, Miyagi Prefecture (registered head office relocation) |
| 2017-04 |
Establishment of a new Osaka office in Chuo-ku, Osaka City (now Osaka branch). |
| 2017-04-04 |
Established a new Osaka office in Chuo-ku, Osaka City, Osaka Prefecture (now Osaka Branch). |
| 2017-06 |
Designated as a First Section company on the Tokyo Stock Exchange. |
| 2017-06-06 |
Designated as Section 1 of the Tokyo Stock Exchange. |
| 2022-04 |
Transitioned to the Prime market following the restructuring of the Tokyo Stock Exchange's equity market. |
| 2022-04-04 |
Transitioned to the Prime Market following the restructuring of the Tokyo Stock Exchange's equity market. |
| 2022-07 |
Renamed the Tokyo office to Tokyo branch and relocated to Minato-ku, Tokyo. |
| 2022-07-07 |
Renamed the Tokyo office to Tokyo Branch and relocated to Minato-ku, Tokyo. |
| 2024-01-01 |
Relocated the Osaka Branch to Kita-ku, Osaka City, Osaka Prefecture. |
| 2024-01 |
Relocated the Osaka branch to Kita-ku, Osaka City. |
| 2025-12 |
Transitioned to the Standard market of the Tokyo Stock Exchange. |
| 2025-12-12 |
Transitioned to the Standard Market of the Tokyo Stock Exchange. |
