Julius Baer says its chief executive is resigning and the Swiss bank is quitting the private debt business, as well as setting aside more than half a billion Swiss francs, reportedly over its exposure to bankrupt Austrian asset manager Signa.

Chairman Romeo Lacher expressed “regret” during a presentation on Thursday of the bank’s 2023 results, saying management had not been a “good steward of our firm” but that the troubles were a “single credit event” and other parts of the company were performing well.

Zurich-based Julius Baer said it was leaving the private debt business and the annual results reflected net credit losses of 606 million Swiss francs (£556 million), 586 million francs (£537 million) of which included a loan-loss allowance for unspecified private debt exposure.

Chief executive Philipp Rickenbacher said in a statement that he and the board agreed “it is in the best interest of the company for me to step down” and that the measures taken on the private debt business “pave the way to move forward and regain the full confidence of our stakeholders”.

The bank said deputy chief executive and chief operating officer Nic Dreckmann will step in as chief executive temporarily until a permanent successor can be found.

Shares of Julius Baer were up nearly 6% to 50.02 Swiss francs in mid-morning trading Thursday on the SIX Swiss Exchange after the news.

Media reports said the bank’s troubles were linked to Signa, but Julius Baer did not specify.

The bank announced the exposure to private debt issues in November, comprising three loans to different entities at a “European conglomerate” active in commercial real estate and luxury retail.

Signa Development faced a series of ratings downgrades and filed for insolvency proceedings in Vienna in late December.

Switzerland’s financial markets regulator said that month that it was looking into the Austrian firm’s situation.

The woes for Julius Baer come as the bank has benefited in part from the flight of some former customers from one-time competitor Credit Suisse, whose unravelling led to a government-orchestrated takeover by rival UBS last year to avert a possible global banking crisis.