Underfolio

Every trading day › 1986

The stock market on October 17, 1986

October 17, 1986, a Friday. The S&P 500 fell 0.29% to close at 238.84. Of 5,986 US stocks that traded, 1,722 rose and 2,075 fell.

The S&P 500-0.29%closed at 238.84
How big a move#16,812of 24,799 trading days since 1928
$100 in the index since$3,226price only, to September 24, 2026
Stocks that rose1,722of 5,986; 2,075 fell
Biggest companyInternational Business Machines Corporationby market value that day
Last day of trading for2stocks

Biggest rises among the 500 largest companies

Goodyear Tire & Rubber (GT)+8.5%
Chemical Waste Management (CHW)+7.8%
Maxus Energy (MXS)+6.5%

Biggest falls among the 500 largest companies

DirecTV (GMH)-5.2%
Subaru Of America (SBRU)-4.7%
E-systems Inc. (ESY)-4.1%

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

‹ October 16, 1986 · Every October 17 · October 20, 1986 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.