The tech-heavy Nasdaq Composite reached an intraday record high of 27,231.48, rising 109.38 points or 0.40% on Tuesday, driven by strong gains in Alphabet shares.
Market sentiment was supported by falling oil prices and potential US-Iran talks, as well as Saudi Arabia restarting operations at its East-West Pipeline.
Brent crude fell 1.2%, though prices remained near $100 a barrel, while traders estimated a 53.1% chance of a 25-basis-point interest-rate increase in October.