Here's who's getting rich on Slack's multi-billion dollar IPO

Cal Henderson is the cofounder and CTO of Slack.

He met Butterfield before Flickr was created back when Flickr was also trying to be a gaming company. He helped Butterfield create a photo-sharing service to pay the bills while they worked on the game.

When Butterfield launched another gaming company, Henderson was in. This time they built a wildly successful chat app.

Henderson owns nearly 16.8 million shares. At $28/share his stake would be worth nearly $470 million.

The success of Slack is a major feather in the cap of Accel partner Andrew Braccia. Braccia invested in Slack during its $1.5 million seed round and bought more shares as the company sold them. (Slack has raised a total of $1.22 billion from venture investors over the years.)

Accel is currently Slack's largest shareholder, with a 24% stake in the company, and it stands to make a lot of profit. It bought series A shares at $2.85 a share, according to Pitchbook.

Accel's owns nearly 120 million shares. At $28/share, that stake would be worth nearly $3.4 billion.

Marc Andreessen and his venture firm Andreessen Horowitz also bought into Slack during the seed stage and increased its stake as Slack raised more money.

Currently, the caretaker of this investment is A16z partner John O'Farrell, who is also a Slack board member.

Back in 2014, the very young Slack starting going viral and Andreessen tweeted out a chart of its growth, saying "I have never seen a viral enterprise app take off like this before — all word of mouth."

Slack kept growing from there.

Andreessen Horowitz's owns nearly 67 million shares and is the second-largest shareholder, with a roughly 13% stake in Slack. At $28/share that stake would be worth nearly $1.9 billion.

Slack's success is a much-needed booster shot for Chamath Palihapitiya and the venture firm he founded Social Capital.

Social Capital melted down last year, with a wave of partners leaving, after Palihapitiya launched an avant garde method of automatically funding startups using metrics and algorithms.

Palihapitiya originally made his money as an early employee at Facebook, though as a VC he's done well backing companies like Box, SurveyMonkey and Yammer.

He plowed his own money into Social Capital as one of its major investors, so Slack's payday should benefit him handsomely.

Social Capital owns nearly 51 million shares and is the third-largest shareholder. At $28/share that stake would be worth over $1.4 billion.

Japanese investment powerhouse Softbank Vision Fund first bought into Slack after the company had already become successful, in 2017 as part of a huge $250 million venture round.

Those shares are managed by SoftBank's COO Ruwan Weerasekera.

It bought into other rounds as well and now owns nearly 37 million shares, or 7.3% of the company. At $28/share that stake would be worth, just over $1 billion.

Allen Shim joined Slack in 2014 as the senior VP of finance and was promoted to CFO in 2018.

This turned into a bigger job than he could possibly have imagined back in 2014 because Slack is going public in a direct listing, meaning it didn't hire a bunch of bankers to run the IPO.

Shim's stake is nearly 2.7 million shares, which, at $28/share, would be worth nearly $75 million.

Robert Frati is Slack's senior VP of Sales and Customer Success. He joined the company in 2016 after a decade at Salesforce.

Frati was the highest paid exec at Slack in 2019, with a base salary of $450,000 compared to Butterfield's $430,000. (He also earned double the other's cash bonus.)

He owns 494,305 shares. At $28 per share, his stake would be worth nearly $14 million.

David Schellhase is Slack's General Counsel and secretary who joined the company at the end of 2016. He's working especially hard with this IPO because it's a direct listing.

He's got 444,028 shares. At $28/share they would be worth over $12 million.

Sarah Friar, the CEO of Nextdoor and former CFO of Square, joined Slack's board of directors in 2017.

She has 406,017 shares (and Slack mentions that there may be 228,385 restricted stock units available to her.) At $28/share, the 406,017 shares would be worth over $11 million.

Edith Cooper is a board member who joined Slack in 2018. She was famously the head of HR for banker Goldman Sachs, a post she left in 2017.

Cooper has a total of 273,428 restricted stock units available to her, though Slack says her vested stake that will be available to her around the time of the IPO is 85,446 shares. At $28/share, this stake would be worth nearly $2.4 million