Shares of technology companies fell for the third consecutive session, as fears percolated about rich valuations of artificial-intelligence companies.

The major indexes close the day with losses on Thursday after wavering earlier in the session. Palantir stock adds suspense.

Walmart’s adjusted earnings miss analysts’ estimates but second-quarter revenue tops forecasts. AI stock Palantir edges ...

Wall Street fell to a fifth straight loss. The S&P 500 slipped 0.4% Thursday. The Dow Jones Industrial Average dropped 152 ...