Which 1987 crash-era exchange closed for the entire trading week after Black Monday?

The Hong Kong Stock Exchange closed for the entire trading week after Black Monday in 1987.

Hong Kong’s market had already suffered a major fall before the October 19 collapse in the United States. Trading was suspended from October 20 through October 23, 1987, as officials attempted to contain panic and stabilize market operations.

The Hong Kong crash helped transmit fear internationally. Declines spread through Australia, Singapore, and European markets before reaching the United States. When trading resumed in Hong Kong, the market continued to experience extreme volatility.

The shutdown is distinct from ordinary circuit breakers, which pause trading for hours or less. It also differs from the New York Stock Exchange’s response: the NYSE remained open on Black Monday even though prices plunged and trading systems became severely strained.