European Stocks Set for Worst Week Since April as French Bond Yields Spike

European stock markets are heading for their worst weekly performance since mid-April, as a sell-off in sovereign debt and anxiety over France's fiscal health weigh on investor sentiment. Despite a modest rebound on Friday, the pan-European STOXX 600 index remained on course for a weekly decline of nearly 2%.

French Fiscal Fears Roil Bond Markets

The primary catalyst for the market pressure is a synchronized sell-off in European government bonds, triggered by concerns over France's 2027 draft budget. This has pushed the yield on France's 10-year government bond (OAT) to its highest level since 2002 as investors demand a greater premium for holding the country's debt.

The risk aversion is most evident in the bond market's key risk indicator. The yield spread between 10-year French and benchmark German bonds widened to over 140 basis points, its largest gap since the Eurozone sovereign debt crisis in 2012, according to Reuters. This fixed-income dislocation also pushed the euro to multi-year lows against the U.S. dollar.

A Tentative Rebound Amid Weekly Losses

Major European bourses saw a slight recovery in Friday's trading after hitting three-month lows in the prior session. The STOXX 600 edged up 0.2%, with similar gains seen in Germany’s DAX, France’s CAC 40, and the UK’s FTSE 100.

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However, the small gains did little to offset the week's broader downturn. The sharp rise in borrowing costs across the continent creates a more challenging environment for corporations and dampens the relative appeal of equities compared to less risky government debt.

Key Inflation and Jobs Data in Focus

Investors are now turning their attention to crucial upcoming economic data. The preliminary September inflation reading for the Eurozone is expected to show headline inflation rising to 3.6% from 3.2% in August, according to a Reuters poll of economists, largely due to higher energy costs.

Across the Atlantic, the U.S. September employment report will be closely watched. A strong labor market figure would likely reinforce the Federal Reserve's "higher-for-longer" interest rate stance, potentially adding further upward pressure on global bond yields.