Investing.com - Netflix (NASDAQ:NFLX) stock has surged in 2018 and two Wall Street firms think there is more to come.UBS and Macquarie both raised their 12-month stock price targets, saying quality content and a new generation of HDTVs will boost subscribership.UBS raised its price target from $290 to $345 a share, while Macquarie increased its from $275 to $330.UBS called Netflix a "content powerhouse", able to appeal to both international and domestic audiences. Macquarie expects more people to pay for Neflix's premium-priced service as they purchase the latest high definition television, known as 4k TV.Netflix shares are up about 60% this year, while the S&P 500 is essentially flat.