The announcement gives an insight into the scale of the bank run that caused the 167-year-old lender to fail and triggered its state-backed rescue, the BBC reported.
It came as the bank reported what are expected to be its last ever financial results.
Its forced sale to rival Swiss bank
Credit Suisse's flagship wealth management division saw assets it managed drop to 502.5 billion francs at the end of March, almost 29 per cent lower than the same period last year, the bank said in a statement.
"These outflows have moderated but have not yet reversed as of April 24, 2023," it added.
Credit Suisse clients started pulling money out of the bank after it was caught up in the market turmoil that followed the collapses of
In Switzerland, authorities put together a rescue package for Credit Suisse.
It included more than 200 billion francs of financial guarantees and saw UBS agree to take over Credit Suisse.
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