Though the markets retreating from all-time highs is a sign that investors are concerned on valuations, I'm making a few exceptions in my portfolio for truly exceptional growth stocks that have long-term expansion opportunities regardless of pricey multiples.With combined experience of covering technology companies on Wall Street and working in Silicon Valley, and serving as an outside adviser to several seed-round startups, Gary Alexander has exposure to many of the themes shaping the industry today. He ha ...