| March 1956 | YUKIGAYA METAL CORPORATION Established at 5-30-4, Higashi-Yukigaya, Ohtaku, Tokyo, Japan. Capital ¥300,000. |
| June 1960 | Increased capital to ¥1,200,000. |
| June 1961 | Increased capital to ¥8,000,000. |
| August 1963 | Purchased 990m2 of land located at 1303 Futoo-cho, Kohhoku-ku, Yokohama City, Kanagawa and established Yokohama Factory. |
| June 1964 | Increased capital to ¥25,000,000 |
| June 1967 | Constructed five-story head office building located at 5-28-2, Higashi-Yukigaya, Ohta-ku, Tokyo, Japan. Increased capital to ¥45,000,000. |
| November 1967 | Changed name to YUKIGAYA METAL, CO., LTD. |
| March 1972 | Increased capital to ¥49,500,000. |
| May 1974 | Consolidated for the purpose of improving the face-value of the stock and changed the company's name to JALCO CO., LTD. |
| October 1975 | Increased capital to ¥200,000,000. |
| February 1977 | Increased capital to ¥250,000,000. |
| October 1978 | Opened stock at Tokyo Stock Exchange as registered stock. |
| December 1980 | Established Niigata Factory. |
| April 1982 | Established Osaka Sales Office |
| April 1984 | Increased capital to ¥1,010,000,000. |
| July 1984 | Established Tohkamachi Factory. |
| August 1986 | Established subsidiary: JALCO ELECTRONICS(MALAYSIA)SDN. BHD. |
| September 1987 | Established subsidiary: JALCO ELECTRONICS(SINGAPORE) PTE. LTD. |
| April 1990 | Established Fukushima Factory. |
| October 1993 | Established subsidary: JALCO ELECTRONICS(HONG KONG)LTD. |
| June 1995 | Established subsidiary: P.T.JALCO ELECTRONICS INDONESIA. |
| July 2001 | Established subsidiary: HANGZHOU JALCO ELECTRONICS CO., LTD. |
| March 2003 | Fukushima factory ISO14001 certification acquisition |
| December 2003 | Head office ISO14001 certification acquisition |
| May 2007 | Relocated Head office to 1-6-1, Yushima, Bunkyo-ku, Tokyo |
| April 2008 | Head office ISO9001 certification acquisition |
| July 2008 | Fukushima factory ISO9001 certification acquisition |
| October 2009 | Hallys has become a consolidated subsidiary of Jalco. |
| December 2009 | Established Heiwajima office. |
