Global banking shares took a fresh beating on Wednesday as Credit Suisse shares slid to a new record low as its largest investor said it could not provide the Swiss bank with more financial assistance. Efforts by regulators and financial executives to ease contagion fears sparked by last week's collapse of Silicon Valley Bank (SVB) had bought some brief stability to markets, but turmoil once more appeared to be taking over. Saudi National Bank cannot give more money to Credit Suisse as it cannot go above 10% ownership due to a regulatory issue, SNB's chairman Ammar Al Khudairy told Reuters.