Underfolio

Every trading day › 1984

The stock market on October 8, 1984

October 8, 1984, a Monday. The S&P 500 fell 0.34% to close at 162.13. Of 5,757 US stocks that traded, 1,043 rose and 1,816 fell.

The S&P 500-0.34%closed at 162.13
How big a move#15,648of 24,799 trading days since 1928
$100 in the index since$4,752price only, to September 24, 2026
Stocks that rose1,043of 5,757; 1,816 fell
Biggest companyInternational Business Machines Corporationby market value that day
Last day of trading for4stocks

Biggest rises among the 500 largest companies

General Instrument (GIC)+3.1%
Pioneer Corp-Texas (PNA)+3.0%
RadioShack (TAN)+2.5%

Biggest falls among the 500 largest companies

S&P Global (MHP)-4.3%
Diebold Nixdorf Incorporated (DBD)-3.7%
Intergraph Corp (INGR.)-3.7%

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

‹ October 5, 1984 · Every October 8 · October 9, 1984 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.