US Stock Market Summary – June 18, 2026

U.S. stocks closed sharply higher on the 18th (local time) in a rebound led by semiconductors. The U.S. and Iran signed a 14-point agreement that includes reopening the Strait of Hormuz, easing geopolitical risks and quickly reversing the shock delivered by the previous day's hawkish FOMC. The Nasdaq surged 1.91%, the S&P 500 gained 1.08%, and the Dow Jones underperformed at 0.14%. The semiconductor ETF (SOXX) skyrocketed 6.46% to lead the rally, while the volatility index (VIX) stabilized at 16.45. However, in the bond market, bets on a July rate hike grew, leaving a hawkish Fed overhang, and the Fear & Greed Index remained in the "Fear" zone at 38 Source.

Technology ($XLK +3.04%) dominated all sectors on semiconductor strength, while Consumer Discretionary ($XLY +1.45%) and Industrials ($XLI +0.73%) also rose as risk appetite recovered. The small-cap index (Russell 2000) gained 1.97%, showing the buying broadened out. On the other hand, the U.S.–Iran peace progress reduced defensive demand, leaving Energy ($XLE -1.65%) as the weakest sector, while Healthcare ($XLV -0.87%) and Financials ($XLF -0.89%) also declined. By asset, oil prices fell further, pressuring energy stocks, while safe havens such as gold ($GLD) and silver ($SLV -1.81%) were pushed aside by the recovery in risk appetite. Long-term Treasuries ($TLT +0.45%) posted modest gains.

Gains were overwhelmingly concentrated in semiconductors and AI hardware. Sandisk ($SNDK) jumped 11.43% and Corning ($GLW) surged 11.13%, while Intel ($INTC), on news of a domestic production collaboration with Apple, soared 10.56% to a new all-time high. Micron ($MU) rose 8.51% on rising memory-demand expectations, and KLA ($KLAC), Marvell ($MRVL), TSMC ($TSM), and Texas Instruments ($TXN) also rallied around 7% Source.

Some stocks, however, declined. IBM ($IBM) fell 5.05%, and RTX ($RTX) dropped 3.62% as concerns over defense-demand emerged from the peace agreement. SpaceX ($SPCX), sliding for a third straight day since its listing, lost 3.57%, leaving a significant number of investors who bought after the IPO underwater Source.

> Key events for the next trading session are displayed automatically.

> "The signing of the U.S.–Iran deal is overriding the negative sentiment brought on by the Fed, which was more hawkish yesterday."

> — Art Hogan, Chief Market Strategist at B. Riley Wealth

> "The initial U.S.–Iran agreement has injected additional confidence into the market."

> — Jim Baird, Chief Investment Officer (CIO) at Plante Moran Financial Advisors

> "Reflecting AI memory demand, we are significantly raising Micron's target price from the previous $500 to $1,300."

> — Matthew Bryson, Analyst at Wedbush

The sharply higher semiconductor stocks have piled up RSI overbought and upper Bollinger Band breakout signals, warning of short-term overheating. On the other hand, energy and defense stocks pressured by the peace agreement and lower oil prices have broken below the lower Bollinger Band, entering an extreme oversold zone, while some large-cap software stocks that plunged yesterday have shown stochastic oversold signals. Detailed signals by stock can be found in the report below.