China's HNA Group has taken a stake of just over 3 percent in Deutsche Bank, and it said on Friday that it could buy further shares in the German lender.
"We have the fullest confidence in Deutsche Bank's management and will keep a close watch on its future steps and lend support as a shareholder where appropriate," a spokesman for HNA said.
The aviation and shipping company intends to keep its holding below 10 percent, he said.
HNA's stake of 3.04 percent, worth about 750 million euros ($796 million) at current share prices, makes it the bank's biggest shareholder after Qatar, which has close to 10 percent of the stock via two sovereign wealth funds, and BlackRock, which owns 6.1 percent.
Deutsche Bank said it welcomes in principle any long-term investor.