Underfolio

Every trading day › 1987

The stock market on September 10, 1987

September 10, 1987, a Thursday. The S&P 500 rose 1.02% to close at 317.13. Of 6,352 US stocks that traded, 2,508 rose and 1,458 fell.

The S&P 500+1.02%closed at 317.13
How big a move#5,838of 24,799 trading days since 1928
$100 in the index since$2,429price only, to September 24, 2026
Stocks that rose2,508of 6,352; 1,458 fell
Biggest companyInternational Business Machines Corporationby market value that day
Last day of trading for1stock

Biggest rises among the 500 largest companies

ALZA Corporation (AZA)+12.6%
I M S International Inc (IMSI.)+8.9%
Reynolds Metals (RLM)+7.3%

Biggest falls among the 500 largest companies

Gap, Inc. (The) (GPS)-4.2%
Cray Research (CYR)-2.5%
BankBoston (BKB)-2.4%

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

‹ September 9, 1987 · Every September 10 · September 11, 1987 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.