The S&P 500 closed Tuesday at 6,591.90, up 0.54 percent. The Dow Jones Industrial Average rose 0.66 percent to 42,429.49. In ordinary times, these would be unremarkable numbers — a modest green day in a market that produces them regularly. These are not ordinary times. [1]

The week's actual story is volatility measured not in percentage points but in trillions. The Kobeissi Letter, a widely followed financial research account, documented a $3 trillion swing in S&P 500 market capitalisation over the course of a single week, driven almost entirely by headlines about the Iran war. On Friday alone, the sequence was precise enough to time-stamp: Trump said no ceasefire at 3:43 PM, the index hit a 2026 low. At 5:13 PM, a report of "productive talks" appeared. Two trillion dollars materialised in the subsequent rally. Iran denied the talks. A trillion vanished.

This is not price discovery. It is a market that has outsourced its valuation function to the news cycle of a war whose participants cannot agree on whether negotiations are occurring.

Tuesday's gains were more conventional in their mechanics. Energy stocks led, rising 1.8 percent on expectations that a prolonged conflict would sustain elevated oil prices. Airlines fell 2.1 percent on the same logic — fuel costs eat margins. The sector rotation is the war priced into corporate earnings: who benefits from $90 oil and who does not.

Individual analyst calls reflected the market's confusion about what to do with technology stocks in a geopolitical environment this unstable. Citi raised its Amazon target to $285, citing the company's resilience to macroeconomic disruption. UBS went the other direction, cutting Microsoft from $600 to $510 — a $90 reduction that reflects concern about enterprise spending in a slowing economy. When two major banks disagree by that margin on the same sector, the signal is not about the companies. It is about the range of plausible futures.

The deeper pattern is structural. Markets have always reacted to geopolitical events, but the speed and magnitude of the current swings suggest something new: an information environment in which unverified claims move trillions of dollars before they can be confirmed or denied. A presidential statement about talks, a foreign ministry denial of talks, and the market whipsaws between them in real time.

The S&P 500 is up for the week. It was down for the week on Friday. It will be up or down by the time you read this, depending on which headline arrived last.

-- Hendrik Van Der Berg, Brussels