1902
Tsuneta Yano issues Characteristics of My Company, a pamphlet explaining the merits of a mutual company, and subsequently establishes Japan's first mutual life insurance company, the Dai-ichi Mutual Life Insurance Company.
1938
The Head Office is moved to its current Tokyo location, which served as the General Headquarters of the Allied Powers (GHQ) following World War II .
1967
Dai-ichi's 20-story Oi Head Office, housing the Company's Policy Service departments and Computer Systems Department, is completed.
1970
FALIA, Foundation for the Advancement of Life Insurance Around the World, a consolidation of several related organizations active since 1962, is established to expand Dai-ichi's support for the life insurance business in Asia.
1975
Dai-ichi's first overseas representative office is established in New York (currently Dai-ichi Life International (U.S.A.), Inc.) to study U.S. insurance, economic, and financial systems as well as to promote international group insurance policies among local subsidiaries of Japanese corporations.
1982
Dai-ichi's first European representative office is established in London (currently Dai-ichi Life International (Europe) Limited).
1988
Dai-ichi establishes Dai-ichi Life International (H.K.) Limited (currently Dai-ichi Life International (AsiaPacific) Limited).
1990
Dai-ichi's investment in Lincoln National Life Insurance Company marks the first time a Japanese company has participated in capitalizing a leading U.S. insurer (already ceased).
1993
Dai-ichi completes the DN Tower 21, a new Head Office building in the heart of Tokyo.
1995
Following the Great Hanshin Earthquake in January, Dai-ichi simplifies claims settlement procedures.
1996
Dai-ichi establishes the Dai-ichi Property and Casualty Insurance Co., Ltd. (already ceased).
1997
Dai-ichi establishes Dai-ichi Life Research Institute Inc.
1998
- Dai-ichi enters into the investment trust business as Daiichi Life Asset Management Co., Ltd.
- Dai-ichi reaches an agreement on total business cooperation with the Industrial Bank of Japan, Ltd. (currently Mizuho Bank, Ltd.).
1999
- Dai-ichi and the Industrial Bank of Japan Co., Ltd. establish IBJ-DL Financial Technology Co., Ltd. (currently Mizuho-DL Financial Technology Co., Ltd.).
- Dai-ichi Life Asset Management Co., Ltd., IBJ NW Asset Management Co., Ltd. and IBJ Investment Trust Management Co., Ltd. merge to form DLIBJ Asset Management Co., Ltd. (currently DIAM Co., Ltd.).
2000
Dai-ichi enters into an agreement to form a comprehensive business alliance with the Yasuda Fire and Marine Insurance Co., Ltd. (currently SOMPO JAPAN INSURANCE INC.) and a strategic marketing alliance with American Family Life Assurance Company of Columbus (AFLAC).
2001
Dai-ichi wins the "Japan Quality Award," the first company in the financial and insurance industry to receive this honor.
2002
Marking a century of insurance and investment achievements, Dai-ichi celebrates its 100th Anniversary.
2003
Dai-ichi issues subordinated bonds worth 
30 billion for public subscription using a securitization scheme.
2004
- Dai-ichi issues U.S. dollar-denominated subordinated bonds in the global capital market.
- Dai-ichi raises additional foundation funds worth 80 billion through public offering using a securitization scheme.
2006
- Dai-ichi raises additional foundation funds worth 60 billion.
2007
- Dai-ichi acquires Bao Minh CMG, which recommences operations as Dai-ichi Life Insurance Company of Vietnam,Ltd.
- Dai-ichi's wholly-owned subsidiary, Dai-ichi Frontier Life Insurance Co., Ltd., obtains a license for life insurance business.
- Dai-ichi concludes a joint-venture contract to establish a joint life insurance company (Star Union Dai-ichi Life Insurance Company Limited) with the Bank of India and Union Bank of India.
2008
- Dai-ichi adopts a plan to demutualize and become a stock company.
- Dai-ichi concludes an agreement on a strategic business alliance, including the acquisition of shares, with Ocean Life Insurance Co., Ltd. of Thailand.
- Dai-ichi enters into an agreement to form a strategic business alliance with TOWER Australia Group Limited (TOWER Australia).
2009
- Star Union Dai-ichi Life Insurance Company Limited commences sales of its products.
- Dai-ichi enters into 183 billion syndicated subordinated loan.
- The 108th general meeting of representative policyholders approves Dai-ichi's demutualization.
2010
- Dai-ichi demutualizes and is listed on the Tokyo Stock Exchange.
2011
- Dai-ichi issues U.S. dollar-denominated perpetual subordinated notes in the global capital market.
- Following the Great East Japan Earthquake in March, Dai-ichi offers aid to the victims and special treatment for the policyholders affected by the earthquake.
- Dai-ichi successfully acquires 100% ownership of TOWER Australia, and TOWER Australia changes its name to TAL Limited.
2012
- Dai-ichi enters into a strategic business and capital alliance with Janus Capital Group Inc., a U.S. asset management company.
