** Shares in Adyen ADYEN.AS rise 2.3% at 0820 GMT, leading gains on the Netherlands' blue-chip index AEX .AEX, after the Dutch payments processor unveiled its new long-term outlook
** Adyen expects EBITDA margin above 55% by 2028 and annual net revenue growth of around 20% after 2026
** J.P. Morgan says the new guidance is cautious
** "The company has the potential to beat it and that puts the stock in a good place even if there could be some near-term disappointment on the slight reset," it says
** Shares rise as much as 3.3% and as of Monday's close, the stock is down 5.8% YTD
(Reporting by Gianluca Lo Nostro)
((gianluca.lonostro@thomsonreuters.com;))