Earliest days
From the establishment of Aoki Sekiyu, the antecedent company, until the establishment of Taiyo Oil
- 1908Meiji 41
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September
The late Shigekichi Aoki, the founder, established Aoki Sekiyu in Takaoka Town, Kochi Prefecture (currently Tosa city).
- 1915Taisho 4
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February
Relocated to Yawatahama City in Ehime Prefecture
- 1918Taisho 7
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Kerosene production was started from the materials supplied by Rising Sun's Kyushu-Saitozaki Oil Refinery.
- 1923Taisho 12
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August
Started to refine oil in a Hickman Distillation (Method) Unit.
- 1930Showa 5
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May
Renamed as Aoki Sekiyu Co., Ltd.
Capital of JPY 20 thousand.
- 1938Showa 13
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October
The factory was relocated to Kameoka Village in Ochi-gun, Ehime Prefecture (the current site of Shikoku Operations).
- 1941Showa 16
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February
The refinery sections of Aoki Sekiyu, Mikado Seiyu, and Matsuoka Sekiyu were integrated into Taiyo Oil Co., Ltd. The head office was established in Mita-toyooka, Shiba-ku, Tokyo.
Capital of JPY 1 million.
- 1943Showa 18
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July
The head office was relocated to Yawatahama City in Ehime prefecture. The capital increased to JPY 4 million.
Postwar recovery period
Full-scale independent production activities began during this period.
- 1949Showa 24
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December
GHQ allowed reopening of refineries on the Pacific Coast. Construction of facilities for crude oil distillation was started.
- 1951Showa 26
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February
Permission was granted to refine petroleum. An order from Shell Sekiyu was received, and a refinery with an output of 500 barrels/day was started.
- 1953Showa 28
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July
The capital increased to JPY 48 million. Taiyo Oil started to operate its own refinery.
- 1958Showa 33
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October
Soviet crude oil was imported to Japan for the first time.
- 1964Showa 39
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June
The late Ryosaku Aoki became the second president.
The capital increased to JPY 52 million.September
Rumanian crude oil was imported to Japan for the first time.
November
The capacity of the crude distillation unit was confirmed to be 59,000 barrels/day.
Growth period
The sophistication of refining operations on a full-scale basis began during this period.
- 1965Showa 40
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September
The late Shigeyoshi Aoki became the third president.
- 1967Showa 42
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July
The capital increased to JPY 100 million.
- 1969Showa 44
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April
Taiyo Oil became a member of the Petroleum Association of Japan.
- 1970Showa 45
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December
The capital increased to JPY 400 million.
- 1974Showa 49
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September
The capacity of the crude distillation unit was augmented to 69,000 barrels/day.
- 1975Showa 50
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July
The Kikuma Refinery (currently Shikoku Operations) received JIS (Japanese Industrial Standards) accreditation.
- 1976Showa 51
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July
Established a 90-day petroleum stockpiling system.
- 1977Showa 52
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January
Taiyo Oil became the first Japanese corporation to conduct DD crude oil trading with the Malaysian national petroleum corporation (PETRONAS).
- 1981Showa 56
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November
The head office was relocated to the current location (2-2-3 Uchisaiwai-cho).
- 1982Showa 57
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March
An underground oil stockpiling demonstration plant was completed on the premises of Taiyo's Kikuma Refinery. Taiyo Oil took charge of demonstration operations.
- 1983Showa 58
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September
Reduced the capacity of the crude distillation unit by 4,000 barrels/day to 65,000 barrels/day.
- 1986Showa 61
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March
Made investments in the oil development project in Angola's offshore oil fields.
November
Joined the oil development project in Malaysia's offshore oil fields.
- 1991Heisei 3
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June
The crude oil tanker "Taiyoh I" (88,543 DWT) was put into service.
With the completion of the BTX production facilities and the launch of the operation thereat, Taiyo Oil forayed into petrochemicals.December
The petroleum product tanker "Taiyoh II" (58,950 DWT) was put into service.
Period of development
Expansion of operations with the abolition of the Provisional Measures Law on the Importation of Specific Petroleum Refined Products
- 1996Heisei 8
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July
With partial transfer of the functions of the head office, Kikuma Refinery was renamed Shikoku Operations.
- 1998Heisei 10
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October
Participated in the Tokyo Commodity Exchange as a primary member of the oil futures market.
December
Shikoku Operations received ISO 9002 certification.
- 1999Heisei 11
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October
Kunishi Kawai became the fourth president.
- 2002Heisei 14
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March
Shikoku Operations received ISO 14001 certification.
- 2003Heisei 15
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August
The capacity of the crude distillation unit was augmented to 120,000 barrels/day.
October
Taiyo Petrochemical Co., Ltd. was established.
December
Acquired from Mitsui Chemicals, Inc., a styrene monomer plant in Yamaguchi.
- 2006Heisei 18
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June
Yutaka Oka became the fifth president.
- 2004Heisei 16
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January
Opened Yamaguchi Operations.
December
Established Taiyo Oil Sales Co., Ltd. by merging our subsidiaries.
- 2008Heisei 20
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March
A new office and new onshore shipping facilities on the premises of Shikoku Operations were completed.
September
100th Anniversary of the company's foundation
A new brand "SOLATO" and a new company's logo were introduced. Every item sold or installed at SS was redesigne.
- 2009Heisei 21
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March
The capital increased to JPY 900 million.
September
The capital increased to JPY 2.65 billion.
December
The capital increased to JPY 4.65 billion.
- 2010Heisei 22
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March
The capital increased to JPY 5.6 billion.
November
Completion of the construction and startup of Resid Fluid Catalytic Cracking Unit with a capacity of 25,000 barrels/day
残油流動接触分解装置
- 2014Heisei 26
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March
Merged with Taiyo Petrochemical Co., Ltd.
March
Reduced the capacity of the crude distillation unit to 118,000 barrels/day.
August
The capacity of the Resid Fluid Catalytic Cracking Unit was augmented to 29,000 barrels/day.
November
Completion of the construction and startup of Trans alkylation unit with a capacity of 10,000 barrels/day.
- 2016Heisei 28
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December
All shares of Nansei Sekiyu K.K. acquired.
- 2017Heisei 29
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March
The capacity of the crude distillation unit was augmented to 138,000 barrels/day.
March
The capacity of the Resid Fluid Catalytic Cracking Unit was augmented to 32,000 barrels/day.
- 2018Heisei 30
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September
Deep hydrodesulfurization unit was augmented to 33,000 barrels/day.
- 2019Heisei 31
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March
The capital reduction to JPY 400 million.
- 2022Reiwa 4
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December
Decided to discontinuation of styrene monomer production at Yamaguchi Operations.
- 2023Reiwa 5
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October
Opened Matsuyama Office(Matsuyama City in Ehime Prefecture).
- 2024Reiwa 6
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April
Takahiro Yamamoto became the sixth president.