| 1954 | Overseas Merchandise Inspection Co., Ltd. (OMIC) established. Bangkok Branch Office opened. |
| 1956 | Produce Dept. and Minerals & Chemicals Dept. started. Osaka Branch Office (currently Kansai Branch Office) opened. Vancouver Branch Office opened. |
| 1957 | Calcutta Branch Office opened. |
| 1959 | Portland Branch Office opened. |
| 1960 | Tokyo Laboratories started operations. |
| 1964 | Plant & Machinery Dept. started operations. Agricultural & Consumer Products Dept. started operations. |
| 1977 | Consulting Dept. started operations. |
| 1978 | OMIC India established. |
| 1984 | OMIC International Co., Ltd. established. ＜WTO-PSI＞ |
| 1986 | OMIC Lanka (in Sri Lanka) established. |
| 1989 | OMIC Europe (in UK) established (closed in 2009.) |
| 1990 | OMIC Hong Kong established. |
| 1992 | OMIC TESCO (in Thailand) established. |
| 1993 | OMIC USA (in Oregon, USA) established. Portland Laboratory started operations. Ho Chi Mihn Office opened. |
| 1995 | Melbourne Office (in Australia) opened. OMIC Singapore (R&B, ASIA(S)) established. OMIC Malaysia (R&B, ASIA(M)) established. |
| 1996 | OMIC Myanmar established. |
| 1997 | OMIC Korea -JV established. |
| 1998 | Sacramento Office (in California, USA) opened. COPIT, Thailand joined OMIC as a Group Member. |
| 1999 | Dalian Office (in China) opened. Bernard Heath & Associates (in Australia) (currently OMIC Australia Pty., Ltd.) started operations. |
| 2000 | Organic Certification Dept. (JAS Organic Certification) established. |
| 2001 | OMIC Uzbekistan Office opened. OMIC Indonesia established. |
| 2003 | Offices in Hong Kong, Singapore & Malaysia became 100% OMIC owned. |
| 2004 | Ritchie & Bisset (Singapore) Dalian Office opened. (closed in 2008.) Accredited as Agency of Minister of Health, Labor and Welfare. |
| 2005 | Taipei Office (in Taiwan) established. California Agri Inspection Co., Ltd.（in California, USA） established. |
| 2006 | Invested in FCC Control and Fumigation Joint Stock Company, privatized in Vietnam. OM Inspection Co., Ltd. (in Bangladesh) established. |
| 2007 | Dalian OMIC, China (accredited by AQSIQ) established. |
| 2009 | Perth office (in Australia) opened. OMIC (Cambodia) Ltd. (in Cambodia) established. |
| 2018 | Louisiana office (in USA) opened. (closed in 2023.) |
