Is Slack Really Worth $20 Billion?The office collaboration company's stock fell on its second trading day.

ByMatthew McCreary

Drew Angerer | Getty Images

松弛的股价周四开了38.50美元,company's first day of trading, up 48 percent from a $26 reference price Wednesday. That massive win gave the San Francisco-based tech startup a $19.5 billion valuation, almost triple its private valuation of $7.1 billion. That seems like a high number, considering that Slack itself estimated the market for its industry (workplace collaboration services) at $28 billion in its offering paperwork.

Friday saw the startup fall back to earth, as Slack stock fell 3.63 percent to 37.22. However, the true question about Slack's value won't be determined in its first week of trading (just as Uber's fatewasn't decided by a disastrous IPO).

TheEntrepreneur Index™as a whole was down slightly, falling 0.13 percent asAmazon,Comcastand Adobe Inc. saw losses on the day. The biggest declines on the day came from D.R. Horton (-2.28 percent),Boston Properties(-1.9 percent) andFedEx Corp.(-1.89 percent).

On the other side,Alexion Pharmaceuticalsrose by 2.83 percent Victoria's Secret parent companyL Brandsrose by 2.8 percent on Friday followed by two clothing companies in Victoria's Secret parent company L Brands (2.8 percent) andRalph Lauren Corp.(2.47 percent).

Related:Stock Market Hits New High Thanks to Fed Policy Shift

TheEntrepreneur Index™collects the top 60 publicly traded companies founded and run by entrepreneurs. The entrepreneurial spirit is a valuable asset for any business, and this index recognizes its importance, no matter how much a company has grown. These inspirational businesses can be tracked in real time onEntrepreneur.com.

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Matthew McCreary

Entrepreneur Staff

Associate Editor, Contributed Content

Matthew McCreary is the associate editor for contributed content at Entrepreneur.com.

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