Quoted from the IMF Report:

https://www.imf.org/external/pubs/ft/scr/2016/cr16191.pdf

The largest German banks and insurance companies are highly interconnected, both domestically and globally, and exposed to spillover risks. Network analysis shows that Allianz SE is the largest contributor to systemic risks among the publicly traded German financial corporations. Deutsche Bank AG, on the other hand, is found to be a major source of outward spillover to publically listed banks in Germany and some insurance companies. Further, it is one of the most important net contributors to systemic risks in the global banking system. These findings underline the importance of ensuring the resilience and stability of the bank.