Underfolio

Every trading day › 1978

The stock market on August 31, 1978

August 31, 1978, a Thursday. The S&P 500 fell 0.20% to close at 103.29. Of 4,532 US stocks that traded, 1,154 rose and 1,420 fell.

The S&P 500-0.20%closed at 103.29
How big a move#18,955of 24,799 trading days since 1928
$100 in the index since$7,459price only, to September 24, 2026
Stocks that rose1,154of 4,532; 1,420 fell
Biggest companyInternational Business Machines Corporationby market value that day
Last day of trading for2stocks

Biggest rises among the 500 largest companies

American National Insurance Company (ANAT)+9.1%
Dome Petroleum Ltd (DMP)+6.8%
American Homes 4 Rent (AMH)+5.4%

Biggest falls among the 500 largest companies

Bally Entertainment (BLY)-9.8%
Mgm Grand Hotels Inc (GRH)-7.9%
Colonial Penn Group Inc (CPG)-3.4%

Stock moves count dividends; the index is price only. Market values after 2024 are estimates.

‹ August 30, 1978 · Every August 31 · September 1, 1978 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.