Everyone suspected that the investors, founders and early employees of YouTube made tidy sums when it was acquired by Google for $1.65 billion in stock late last year.

But until yesterday, few knew just how tidy those sums were. The answer, which Google delivered in a filing with the Securities and Exchange Commission, is now in: The sums are big enough to spark a new wave of envy across Silicon Valley.

The biggest windfalls went, not surprisingly, to the company’s three founders and to Sequoia Capital, the main financial backer of YouTube, the popular video-sharing site.

A founder and YouTube’s chief executive Chad Hurley received 694,087 shares of Google and an additional 41,232 in a trust. Based on Google’s closing price yesterday of $470.01, the shares are worth more than $345 million.