Skew & Signal #25

Today's read: The U.S. and Iran traded fire for the first time in a month, oil surged toward $94 and the 10-year Treasury yield hit its highest level since January 2025, dragging stocks into a rough start to historically the market's weakest month. August still closed with solid gains, but September is opening exactly the way its reputation would suggest.

A five-minute briefing built from developments reported August 31–September 1.

U.S. and Iran Trade Fire for the First Time in a Month

Military action resumed between the U.S. and Iran on Monday after roughly a month of relative calm, with President Trump saying the U.S. would strike back over Iran's latest retaliatory attack, pulling the Dow down 374 points, or 0.7%, to close at 53,185.90.

Why it matters: A month-long lull ending this abruptly shows how fragile the recent de-escalation really was, and it resets the market's baseline assumption from "the war is winding down" back to genuine uncertainty about how far this conflict still has to run.

Oil Jumps to $94 as the 10-Year Yield Hits Its Highest Level Since January 2025

Brent crude surged 4.6% to roughly $94 a barrel Tuesday amid fading hopes for a near-term resolution to the Iran war, while the 10-year Treasury yield climbed to 4.79%, its highest intraday level since January 2025, dragging the Dow down 419 points, or 0.8%, and the S&P 500 down 0.7%.

Why it matters: Oil and yields spiking together for a second time this year confirms this isn't a one-off shock but a recurring pattern tied directly to the war's trajectory, and it means any future de-escalation would need to be durable, not just temporary, to meaningfully ease either market.

Semiconductors Sink Across the Board as September Opens on Its Historically Weakest Note

Every single constituent of the Philadelphia Semiconductor Index fell Tuesday, dragging the index down 2.1%, while the Dow Jones Transportation Average slid 2.5% in a session that reinforced September's reputation as the only calendar month with a negative average return since 1926, according to Fisher Investments.

Why it matters: A universal semiconductor decline alongside weak transports, often viewed as an economic health gauge, suggests this isn't a narrow sector rotation but a broad risk-off move, and it's arriving right on schedule for the market's seasonally toughest stretch of the year.

Stocks Still Close August With Solid Monthly Gains Despite the Late Wobble

Heading into Monday's close, the Dow was up 2% for August while the S&P 500 and Nasdaq had gained 3% and 4.1% respectively, extending the Dow's winning streak to five straight months even after Monday's renewed Iran-driven selloff.

Why it matters: A fifth consecutive winning month for the Dow shows the underlying rally has real momentum behind it, and it means September's rocky start is starting from a position of strength rather than an already-fragile market.

Kalshi Files New CFTC Proposal for FX Perpetual Futures

Prediction market exchange Kalshi submitted a new proposal to the CFTC to launch FX perpetual futures contracts on the U.S. dollar and euro, expanding its existing lineup of perpetual contracts, while Singapore separately announced a $173 million, three-year commitment to accelerate its domestic fintech sector.

Why it matters: Kalshi pushing into currency perpetuals shows prediction-market platforms are steadily encroaching on territory long dominated by traditional derivatives exchanges, testing just how far regulators will let this category of product expand.

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Editorial issue for September 2, 2026 · News window: August 31–September 1, 2026