The figures are official at the close of trading in America:
The MSCI World experiences its best trading day EVER (since 1986) with 9.7%. Even before 13.10.2008 with 8.8% and 21.10.1987 with 8.59%
The S&P500 experiences the third best trading day with 10.15% just behind 2 days in 2008 with 11.58% and 10.79%
The Nasdaq 100 also comes in third place with 12.05% behind 12.58% in 2008 and 18.77% in 2001
This means that 09.04.2025 will go down in history.
The figures were taken from the Ishares ETF, so may differ slightly from the index. And it was calculated in EUR. As the USD/EUR exchange rate is almost +-0 today, this should have little impact