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Dax Falls 2.6 Percent as September Seasonality Bites

By Markets Desk · 2026-09-13 · 1 min read
A large oil tanker ship navigating through a narrow, rocky strait
Illustration: Tradingbird

The German benchmark index has lost 2.6 percent since the start of September. Weekend geopolitical shocks threaten to deepen the decline.

The Dax index has lost 2.6 percent of its value since the beginning of September. The index reached a record high of 26,619 points in August. September is now testing its reputation as a weak month for equities. Peak losses reached 3.4 percent before a partial recovery on Friday. Market analysts warn that previous lows could be broken if current trends persist.

Geopolitical events have intensified pressure on the market. The British trading organization reported a projectile hit a ship in the Strait of Hormuz. Saudi Arabia has temporarily shut down its critical East-West pipeline. This pipeline transports oil from the Persian Gulf to the Red Sea. Shipment traffic in the Strait of Hormuz has nearly stopped. These disruptions are driving global energy prices higher.

Energy Disruptions Drive Price Increases

Saudi Arabia’s oil exports via the Red Sea terminal have more than doubled since the start of the conflict. The International Energy Agency confirms this surge. The temporary shutdown of the East-West pipeline removes a key alternative route. This action is set to increase price pressure on the energy market. Higher costs for fuel and electricity are becoming a direct burden for businesses.

Rising Rates Create Fourfold Headwind

Higher energy costs have pushed up interest rate expectations. Bond yields have risen in response. This creates a fourfold burden for the stock market. Corporate costs increase due to expensive energy. Investment projects become more expensive to finance. Future earnings are discounted at a higher rate. Bonds become more attractive relative to equities as yields climb.

AI Optimism Faces New Scrutiny

Record highs in the Dax were previously driven by rising profit expectations. These expectations were fueled by the belief that artificial intelligence would boost productivity. Experts warned over the weekend that the pace of AI development might slow. Investors are now reassessing this bet. If the outlook for AI-driven gains weakens, the Dax may continue its downward trend. Historically, September dips have often presented buying opportunities for long-term investors.

Based on reporting by Handelsblatt Finanzen, compiled by the Tradingbird desk.

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