Here's who's getting rich now that Slack is a public company worth over $20 billion

Slack, the workplace messaging app, is now a public company, in one of the most anticipated multi-billion IPOs of the year.

Some of the company's early investors have stakes worth billions, and many employees have shares worth millions.

Here are the people and investors who stand to make the most.

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As of Thursday, June 20, Slack is now a public company.

The stock price jumped immediately from an initial price of $26 to as high as $42. Shares are trading now at about $40 and giving the company a valuation of over $20 billion.

As is customary, the day before its public offering, Slack released an updated prospectus that gave us an updated view of the company's financials and top investors.

As is typical these days, Slack is using a two-tier structure where it sells Class A shares to the public, with each of those shares offering one vote per share; and it has Class B shares that come with 10 votes per share.

But Slack's power structure has a twist. Normally the super-voting shares are held by founders as a way to keep tight-fisted control after their company goes public. In Slack's case, all of its major shareholders will get the Class B shares that provide 10-votes-per share, its paperwork shows. This includes the company's founders, as well as the major investors, board members, and named executives — that's 12 executives in all, the paperwork says.

Each share of Class B common stock can be converted at any time into a share of Class A common stock, should the owner want to sell shares.

We used a price of $40/share to calculate the rough value of the stakes owned by Slack's major shareholders.

Take a look: