Deutsche Bank AG was downgraded Friday by S&P Global Ratings, which cited concerns over the German lender's restructuring plans. The ratings agency cut the long-term issuer credit rating to 'BBB+' from 'A-'on the bank and its core operating subsidiaries. The troubled bank last week announced plans to cut thousands of jobs in a bid to overhaul its operations and cut costs, but S&P said they see "significant execution risks in the delivery of the updated strategy amid a continued unhelpful market backdrop, and we think that, relative to peers, Deutsche Bank will remain a negative outlier for some time," in a statement. Investors also demanded the resignation of the bank's chairman, Paul Achleitner, at the Annual General Meeting last week. Shares have tumbled 42% so far this year. The agency kept a stable rating on the bank's outlook, saying that management will execute the plan over time and achieve longer-term objectives. Meanwhile, Australia's consumer watchdog on Friday announced that it would be bringing criminal cartel charges against Deutsche Bank, Citigroup Inc. and Australia & New Zealand Banking Group Ltd. Shares of Deutsche Bank opened up 1.5%, bouncing off a 7% drop Thursday, which came after the Federal Reserve designated the German lender's U.S. business in "troubled condition," people familiar with the matter told The Wall Street Journal.