Weak demand for electric cars and a sharp drop in sales in China, combined with US tariffs, explain the decline. But sales volumes in Germany are also declining.
Another factor slowing sales is component shortages that are curbing production of the 718 sports car and the Macan SUV.
The compilation confirms the headwinds for Porsche, which lowered its forecasts four times last year.
Porsche is controlled by the German automotive group Volkswagen (VW) and has had Michael Leiters, former CEO of McLaren Automotive, as CEO since the start of the year. Previously, VW CEO Oliver Blume led the business.
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