Market Wrap · August 18, 2026
AI-Infrastructure and Memory Stocks Sink as Rising Yields Repriced Debt-Financed Growth
U.S. equities fell broadly on Tuesday, August 18, in the sector’s worst session in weeks. The S&P 500 (SPY) declined 0.68% to $767.45, the Nasdaq-100 (QQQ) fell 1.69% to $717.51, the Dow (DIA) slipped 0.24% to $532.91, and the Russell 2000 (IWM) declined 1.26% to $300.23. Semiconductors (SMH) sold off far harder than the broader tape, down 4.09% to $569.77, while gold (GLD) and silver (SLV) fell 1.71% and 3.58% respectively — a combination that argues against a simple flight-to-safety read and looks more like a broad markdown of duration risk across both growth equities and precious metals.
The session’s biggest single mover was CoreWeave, which fell 12.10% to $93.17. Reporting from The Motley Fool tied the decline to rising concern over the company’s debt-financing costs and capital intensity: CoreWeave posted $9.4 billion in second-quarter capital spending against nearly $30 billion in long-term debt, a debt-to-equity ratio the outlet put above 14, and the move came as Treasury yields pushed higher and President Trump confirmed no Iran negotiations were underway, adding a geopolitical layer to an already rate-sensitive trade.
Nebius Group fell 7.60% to $248.43 and Applied Digital fell 8.56% to $28.51, both cited in the same report as facing an identical headwind — heavy AI-infrastructure capital spending funded increasingly by debt, now being repriced as rates rise. The broader power and data-center-infrastructure complex sold off alongside them: Talen Energy fell 11.00% to $317.66, Vertiv fell 6.80% to $272.54, and WhiteFiber fell 10.81% to $27.07, though no single dated news event explained the moves in those three names specifically — the pattern read as sector-wide rotation rather than three separate stories.
Memory and semiconductor names were hit hard as well. Micron fell 7.02% to $940.76, Sandisk fell 9.01% to $1,625.78, Marvell fell 7.82% to $216.00, Arm fell 6.67% to $253.32, and Intel fell 6.58% to $96.69. Sandisk’s decline came the same day The Motley Fool reported that David Tepper’s Appaloosa Management had exited its entire Sandisk stake during the second quarter, sold, per the report, near the stock’s June peak — a filing that reflects Q2 positioning rather than Tuesday’s price action.
Elsewhere on the tape
Not every name traded lower. Salesforce rose 2.71%, Netflix rose 2.30%, ServiceNow rose 1.52%, Apple rose 1.45%, and Fortinet rose 1.39%. Crypto was largely decoupled from the equity selloff: Bitcoin rose 0.31% to $64,681.33 and Ethereum rose 0.25% to $1,916.72.