Saudi National Bank, the kingdom's largest lender and majority-owned by the Saudi government, announced Wednesday that it was investing up to $1.5 billion in Credit Suisse — representing a stake of up to 9.9%.
The bank is reportedly set to become the second-largest shareholder of Credit Suisse, second to Harris Associates.
It also aims to cut its cost base by 15%, or 2.5 billion Swiss francs, by 2025.
The SNB chairman cited Credit Suisse's investment banking unit as the Achilles' heel of the company, accentuated by the current climate of increased market volatility.
"The biggest overhang for Credit Suisse, over the past couple of years ... has been the volatility of the performance of their investment bank," he told CNBC.