Amid a flurry of seemingly sky-high valuations, deals and IPOs, the mood in Silicon Valley is a "little crazy," Kenneth Goldman, chief financial officer of Yahoo, told CNBC -- but he argued the excitement was justified.
"It is a little crazy," he said, highlighting how high some of the recent company valuations have been. "They talk about unicorns now – companies valued at over a billion dollars."
Success stories include Uber, which was reportedly valued at $50 billion following a recent funding round -- a valuation that puts it just ahead of Chinese smartphone giant Xiaomi's $45 billion.
But Goldman added: "My own sense is that the public sense is reasonably thoughtful."
He highlighted that price-to-earnings ratios (PEs) on the NASDAQ were currently around 18 – significantly lower than before the dotcom bubble, when PEs were around 100.