Dealmaking fees slumped by $25bn in the first nine months of the year for the world's largest investment banks, with Credit Suisse's near-60% decline the sharpest fall of any major firm.

The top 10 investment banks made $26.4bn in fees from dealmaking in the first nine months of 2022, a 48% decline in the same period last year when revenue reached record highs, according to data provider Dealogic.