German insurer Allianz SE (ALV.XE) said Wednesday it will acquire around 94% of Yapi Kredi Sigorta (YKSGR.IS), an insurance unit of Yapi Kredi--Turkey's fourth largest private bank by assets.

Allianz will buy the stake for around 684 million euros ($878 million), Allianz said in a press release.

The remaining 6% of Yapi Kredi Sigorta is listed on the Istanbul stock exchange and will be subject to a mandatory offer by Allianz shortly after closing. In addition, Allianz has received a 15-year bancassurance distribution agreement with Yapi Kredi, giving it exclusive access to 6.5 million customers.

Yapi Kredi will retain a 20% holding in Yapi Kredi Sigorta's life and pension insurance unit, Yapi Kredi Emeklilik, the statement added.

Write to the Frankfurt Bureau at djnews.frankfurt@dowjones.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires