Will Twilio's successful pricing finally open the tech IPO floodgate?

Jeff Lawson, co-founder and CEO of Twilio
Source: Twilio

Twilio priced 10 million shares at $15, above the initial price talk of $12 to $14 a share.

It's the year's first unicorn to go public, and the first IPO to price above its proposed range since December. It's the first Silicon Valley tech IPO since Square went public in November.

Why the pricing above the range?