Wizz Air Holdings , the U.K.-listed Central European airline, was downgraded to sell from neutral by UBS. The stock is trading at both a record high stock price and enterprise value highs, despite an "uncertain" traffic recovery, it said. UBS said "a large amount of value being priced from long-term growth, which potentially does not adequately account for the execution risk. Indeed even for the largest low-cost airline, Ryanair , there have been past execution issues," it said.
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