| November | 1976 | Taiyo Jimuki Co., Ltd. established |
|---|---|---|
| February | 1980 | Head office moved to Oroshihonmachi, Sasebo-shi, Nagasaki |
| April | 1980 | Kyushu Regional Headquarters of Hokka Hokka Tei Co., Ltd. established |
| April | 1985 | Company name changed to Taiyo Co., Ltd. |
| June | 1987 | Kyushu Regional Headquarters of Hokka Hokka Tei Co., Ltd. merged with Taiyo Co., Ltd. |
| November | 1990 | Head office moved to Kamimuta, Hakata-ku, Fukuoka-shi |
| December | 1990 | Company name changed to Plenus Co., Ltd. |
| July | 1993 | Plenus listed on the over-the-counter market of Japan Securities Dealers Association |
| December | 1993 | PLENUS MK Co., Ltd. established (subsidiary company) |
| June | 1998 | PLENUS FOODS Co., Ltd. established (subsidiary company) |
| April | 1999 | Hokka Hokka Tei Co., Ltd. (Chiyoda-ku, Tokyo) made into a subsidiary of Plenus Co., Ltd. |
| July | 2002 | Hokka Hokka Tei shops number 1,000 |
| September | 2002 | Meshiyadon restaurants number 100 |
| December | 2002 | Plenus listed on the First Section of the Tokyo Stock Exchange |
| March | 2004 | Hokka Hokka Tei Co., Ltd. merged with Plenus Co., Ltd. Hokka Hokka Tei shops number 2,000 |
| December | 2004 | Nihonbashi Yayoi Building built in Chuo-ku, Tokyo, to where the Tokyo Office is moved |
| July | 2006 | "Meshiyadon" trade name changed to "Yayoiken" |
| May | 2008 | New takeaway bento brand "Hotto Motto" created |
| May | 2009 | Head office moved to Kamimuta, Hakata-ku,Fukuoka-shi |
| July | 2010 | Beijing Hotto Motto Restaurant Management Co., Ltd. established at China (joint venture company) |
| February | 2011 | PLENUS & MK PTE. LTD. established at Singapore (joint venture company) |
| January | 2012 | YK Food Service Co., Ltd. established at Korea (joint venture company) |
| July | 2012 | Yayoiken restaurants number 200 |
| March | 2013 | PLENUS AusT PTY. LTD. established at Australia (subsidiary company) |

※Number of employees are as of the end of February, 2013
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