Stocks

Boeing Stock Slumps on 737 MAX Software Issue

Guavy AI Editorial Team Published September 28, 2026

Instruments

Boeing (BA) stock plummeted by 5% on September 28th, sparking renewed investor concern over regulatory and execution risks. A newly discovered software issue in some 737 MAX jets has raised safety and certification concerns.

The FAA is reviewing the issue, which involves a vertical navigation function disengaging during missed-approach scenarios. This problem appears to be limited to specific aircraft and operating conditions, but it's added another layer of complexity for Boeing's recovery story.

Boeing informed operators about the issue in August, but market awareness has increased after recent weekend coverage. Investors may view this as a potential delivery risk, especially given Boeing's ongoing production normalization and certification milestones across the MAX family.

Boeing Stock Slumps on 737 MAX Software Issue

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