| Year | History |
|---|---|
| 1971 | The first Seicomart retail store opens. |
| 1974 | Seicomart, the company, established. |
| 1976 | Seicomart joins NACS (National Association of Convenience Stores). |
| 1981 | The number of retail stores operating in Hokkaido, Japan reaches 100. |
| 1984 | Seico Systems Engineering established. |
| 1985 | The number of stores operating in Hokkaido reaches 200. |
| 1989 | The number of stores operating in Hokkaido reaches 300. |
| 1992 | The number of stores operating in Hokkaido reaches 400. |
| 1993 | Seico Retail Service Company is established. |
| 1994 | The number of stores operating in Hokkaido reaches 500. |
| 1995 | Hot Chef is established in retail stores. |
| 1996 | Seico International Trading Company Ltd. is established in America. |
| 1997 | Distribution Center opens in Kushiro (eastern Hokkaido). |
| 1998 | Distribution Center opens in Asahikawa. The number of store operating in Hokkaido reaches 700. The pickles manufacturing company, Hokkou, is established. |
| 1999 | Distribution Center begins operations in Hakodate (southern peninsula of Hokkaido). Distribution Center begins operations in Wakkanai (northern Hokkaido). |
| 2000 | Seico Seafood products changes name to Hokurei. Seicomart Club Card introduced throughout Hokkaido. The photo developing company Hokuryou Photo established. The number of stores operating in Hokkaido reaches 800. |
| 2001 | Sapporo Distribution Center opens. |
| 2003 | Distribution Center brgins operation in Obihiro (eastern Hokkaido). |
| 2004 | ATM service starts in Seicomart stores. |
| 2006 | Sapporo Chilled Center opened. The number of stores operating in Hokkaido reaches 900. Quick-pay service started in Sapporo and the suberbs of Sapporo. |
