Cisco Systems briefly became the world’s most valuable company by market capitalization in March 2000.
At the height of the dot-com boom, Cisco’s share price rose so rapidly that its market value briefly moved ahead of Microsoft. Investors viewed Cisco as a central supplier of routers, switches, and other networking equipment needed to connect the expanding internet.
The lead was temporary, and the technology-stock collapse that followed sharply reduced Cisco’s valuation. Cisco’s episode illustrates why market-cap rankings can change even when a company’s underlying operations do not change overnight. Market capitalization equals the share price multiplied by shares outstanding, so expectations about future growth can create very large movements in a short period.