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| 2009 | March | Sompo Japan and Nipponkoa Insurance agreed to establish a joint holding company to integrate their businesses. |
|---|---|---|
| July | The two companies signed an agreement on the business integration that set out the share exchange ratio, company name, head office location, and corporate governance structure of the joint holding company. | |
| October | The two companies drew up a share exchange agreement and signed a business integration agreement. | |
| 2010 | April | NKSJ Holdings, Inc., was established. |
| NKSJ Holdings was listed on the Tokyo Stock Exchange (First Section) and the Osaka Securities Exchange (First Section). | May | Sompo Japan acquired 100% of shares in Tenet Insurance Company Ltd, a Singapore P&C insurance company, making Tenet a consolidated subsidiary of NKSJ Holdings. |
October | Sompo Japan Asset Management Co., Ltd. and ZEST Asset Management Ltd. were merged into Sompo Japan Nipponkoa Asset Management Co., Ltd. | November | N.K. Risk Consulting Co., Ltd. transfered its relevant operations to Sompo Japan Risk Management, which was then renamed to NKSJ Risk Management, Inc. |
| Sompo Japan acquired 99.07% of Fiba Sigorta Anonim Sirketi, a P&C insurance company in Turkey, making Fiba Sigorta a consolidated subsidiary of NKSJ Holdings. The company name was changed to Sompo Japan Sigorta A.S. in February 2011. | ||
| 2011 | April | Sompo Japan System Solutions Inc. and N.K. Systems, Limited were merged into NKSJ Systems, Inc. |
| Sompo Japan Information Services Inc. and Nipponkoa Business Services, Co., Ltd. were merged into NKSJ Business Services, Inc. | ||
| June | Sompo Japan acquired 70% of the issued ordinary shares of Berjaya Sompo Insurance Berhad, through Sompo Japan Asia Holdings Pte. Ltd., making Berjaya Sompo a consolidated subsidiary of NKSJ Holdings. | |
| October | Sompo Japan Himawari Life Insurance Co., Ltd. and Nipponkoa Life Insurance Company, Limited were merged into NKSJ Himawari Life Insurance, Inc. | |
| 2012 | April | Prime Assistance Inc. was established to enter the assistance services business. |