** Shares in Aixtron AIXGn.DE fall 4% after the German chip systems manufacturer forecast a weak start to 2026, with a revenue decline in the year
** The company projects Q1 sales of around 65 million euros plus or minus 10 million euros, compared to 112.5 million euros a year earlier
** Jefferies says the company's Q1 sales outlook is below consensus expectations of 111 million euros
** Aixtron expects FY revenues of around 520 million euros ($614 million) plus or minus 30 million euros for 2026, compared to 532.5 million euros forecast in a company-provided poll
** The stock is among the worst performers of Germany's mid-cap index .MDAXI
($1 = 0.8471 euros)
(Reporting by Ozan Ergenay)
((ozan.ergenay@thomsonreuters.com))