Credit Suisse shares plummeted 30% to a record low after Saudi National Bank ruled out further funding for the Swiss lender. Saudi Arabia's biggest bank, which invested $1.5 billion in Credit Suisse last fall, cited regulatory reasons for not increasing its stake. Credit Suisse experienced a series of missteps and compliance failures, leading to customer withdrawals and a net loss of nearly 7.3 billion Swiss francs ($7.9 billion) in 2021.