Broken Iran Ceasefire Can’t Hold Back Equities

Equity markets finished the week mostly higher: the S&P 500 gained 1.3 per cent (up 11.4 per cent year to date [YTD]) and the NASDAQ climbed 1.7 per cent (up 13.4 per cent YTD), while the Dow Jones Industrial Average slipped 0.5 per cent (still up 10.5 per cent YTD). The tech-heavy NASDAQ benefited from a semiconductor rebound and renewed enthusiasm for AI infrastructure names. The Dow, weighted more toward “old economy” stocks than high-growth names, captured none of last week’s gains.

President Trump kicked off last week’s trading, ringing the opening bell from the Oval Office. Monday marked the launch of “Trump Accounts,” a new child savings program under the One Big Beautiful Bill Act that seeds a $1,000 Treasury-funded contribution for children born between 2025 and 2028. The launch underscores this administration’s particular emphasis on economic and market conditions. Following his Liberation Day in April 2025, Trump extended a tariff deadline following a nearly 10% single-day selloff. The president later admitting investors got too “yippy.” That awareness seems to be paying off. The S&P 500 is running well ahead of its historical pace through the first 1.5 years of a presidential term. The index finished 0.7% higher on Monday.

Sentiment shifted Tuesday despite Samsung Electronics’ blowout results. The South Korean company’s operating profit increased more than 1,800% year-over-year, triggering profit-taking rather than celebration. The pressure spilled into U.S. AI-infrastructure names. GE Vernova (ticker: GEV) fell roughly 8% on valuation concerns after a run that had left the stock trading at nearly 59 times trailing earnings. The same day, Iran’s Revolutionary Guard fired missiles at two commercial ships near the Strait of Hormuz, including an LNG tanker whose crew reported an engine-room fire. Oil spot prices advanced 3% as a result.

Speaking at the NATO summit the following day, President Trump said of the ceasefire, “To me, I think it’s over, I don’t want to deal with them anymore.”. Brent crude jumped more than 5% to roughly $78 a barrel, a sharp reversal after weeks of prices drifting back toward prewar levels. Treasury yields moved higher across the curve as the renewed oil spike revived inflation concerns: the 10-year rose more than 4 basis points to 4.571%, the 2-year climbed to 4.206%, and the 30-year added over 2 basis points to 5.069%.

See more: Lessons From Past Conflicts for Today’s Stock Market