The group of seven leading technology companies recorded a combined market value loss of $797 billion in a single trading session, marking their steepest drop since April 2025, as an index tracking the stocks fell 4.8 percent. The selloff drove the S&P 500 lower by 1.2 percent and the Nasdaq 100 by 1.9 percent, after quarterly results from Alphabet and Tesla intensified investor concerns over the sustainability of heavy artificial intelligence investments.

Alphabet increased its full-year capital expenditure outlook to as much as $205 billion. Tesla reported profits well short of forecasts, with its chief executive stating that 2026 would bring substantial further capital outlays. Alphabet alone spent $45 billion in the second quarter, pushing its free cash flow into negative territory for the first time since becoming a public company.

Tesla shares fell 15 percent, their largest one-day decline since March 2025. Alphabet dropped 7.1 percent, its sharpest retreat since May 2025. Microsoft declined 2.2 percent, Amazon 4.6 percent and Meta 3.4 percent. Apple posted the mildest loss among the group after largely avoiding the recent wave of artificial intelligence spending; its shares have risen 11 percent so far this month.

The Magnificent Seven index now stands 11 percent below its late-May peak, representing an erasure of roughly $2 trillion in market capitalization. An asset management executive described the core difficulty as the sheer volume of spending without visible returns on investment, calling the episode a convergence of pressures that also includes rising oil prices linked to an intensifying conflict involving Iran. A chief investment officer at a wealth firm noted that these companies once held some of the strongest balance sheets in corporate America but have shifted toward heavier asset bases, prompting questions about investment returns and the transparency of associated debt.