Underfolio

Every trading day › 1989

The stock market on October 18, 1989

October 18, 1989, a Wednesday. The S&P 500 rose 0.18% to close at 341.76. Of 5,880 US stocks that traded, 2,140 rose and 1,636 fell.

The S&P 500+0.18%closed at 341.76
How big a move#19,704of 24,799 trading days since 1928
$100 in the index since$2,254price only, to September 24, 2026
Stocks that rose2,140of 5,880; 1,636 fell
Biggest companyInternational Business Machines Corporationby market value that day
Last day of trading for1stock

Biggest rises among the 500 largest companies

Aflac (AFL)+11.2%
Alexander & Alexander (AAL)+6.7%
Flagstar Corp+5.7%

Biggest falls among the 500 largest companies

Burlington Northern Santa Fe-3.3%
Supervalu (SVU)-3.3%
Caliber System (CBB)-3.3%

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

‹ October 17, 1989 · Every October 18 · October 19, 1989 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.