When Steve, a thirtysomething engineer, launched a software company in San Francisco a few years ago, he and his cofounder faced the daunting task of hiring a team, from low-level engineers to a new VP. Novices, they nonetheless had an advantage: access to Option Impact, an exclusive database of tech salaries that has become a go-to reference for Silicon Valley startups. That insider information, Steve realized, has immense value.

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