| 1926-10 |
Established Maruo Milling Co., Ltd. in Nishioka, Uozumi Village, Akashi District, Hyogo Prefecture, and began manufacturing and selling pigment for paint. |
| 1926-10-01 |
1926年（大正15年）10月1日 |
| 1926-10-01 |
Founded. |
| 1928-01 |
Absorbed Harima Milling Co., Ltd. and brought Akashi Milling Co., Ltd. under its umbrella. |
| 1931-03 |
Started manufacturing lightweight calcium carbonate: opened a Kobe branch office. |
| 1932-09 |
Opened a Tokyo branch office. |
| 1934-06 |
Opened an Osaka branch office: began manufacturing heavy calcium carbonate. |
| 1939-12 |
Established Maruo Trading Co., Ltd. in Kobayashi-cho, Taisho-ku, Osaka City, with the sales division as a separate organization. |
| 1944-08 |
Made Maruo Trading Co., Ltd.'s Tokyo sales office a separate organization and established Nitto White Co., Ltd. |
| 1948-11 |
Established Maruo Milling Co., Ltd. with its headquarters in Awaji-cho, Higashi-ku, Osaka City. |
| 1948-11-18 |
1948年（昭和23年）11月18日 |
| 1948-11-18 |
Established. |
| 1949-02 |
Started manufacturing colloidal calcium carbonate. |
| 1949-08 |
Maruo Milling Co., Ltd. absorbed Maruo Milling Co., Ltd. (the partnership) and moved its headquarters to Nishioka, Uozumi-cho, Akashi City. |
| 1950-07 |
Absorbed Akashi Milling Co., Ltd. |
| 1953-04 |
Absorbed Maruo Trading Co., Ltd. and made it the Osaka sales office. |
| 1957-03 |
Completed the Tohyama plant and began manufacturing colloidal and lightweight calcium carbonate. |
| 1959-12 |
Established Toyo White Co., Ltd. |
| 1961-03 |
Opened a Nagoya branch office. |
| 1963-08 |
Changed company name to Maruo Calcium Co., Ltd.: the affiliated company Nitto White Co., Ltd. changed its name to Nitto Calcium Co., Ltd. |
| 1963-08 |
Changed company name to Maruo Calcium Co., Ltd. |
| 1964-01 |
Completed the Tsuchiura plant and began manufacturing colloidal and lightweight calcium carbonate: listed on the Second Section of the Osaka Stock Exchange. |
| 1965-05 |
Absorbed Nitto Calcium Co., Ltd. and made it the Tokyo sales office. |
| 1979-04 |
Established Kyushu Calcium Co., Ltd. |
| 1983-10 |
Established the Central Research Institute. |
| 1984-01 |
Completed the Tsuchiura plant and started manufacturing colloidal and lightweight calcium carbonate. |
| 1989-04 |
Listed on the Second Section of the Osaka Stock Exchange. |
| 1989-06 |
Completed the Maruo Osaka Building in Fukushima-ku, Osaka City, and relocated the Osaka office. |
| 2001-03 |
Opened the Order Center. |
| 2003-09 |
Established Maruo (Shanghai) Trading Co., Ltd. |
| 2007-09 |
Established Dongguan Limal Nano Technology Co., Ltd. |
| 2013-07 |
Listed on the Second Section of the Tokyo Stock Exchange. |
| 2017-03 |
Completed the headquarters office building. |
