In tech world, rich startups get richer

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Quora, a question-and-answer website, didn’t need to raise money. It had barely touched $60 million in venture capital it accepted just two years ago.

Yet the California company, which has no revenue and just 70 employees, recently said it had raised an additional $80 million.

The eye-popping investment — for no obvious immediate purpose — was the latest example of a dynamic reshaping Silicon Valley: Startups, already flush with cash, are piling on the investment dollars.

Of the 100 largest venture capital rounds on record, 88 were issued within the past five years, according to CrunchBase, which tracks venture funding. Each delivered more than $50 million to the companies.

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