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				The San Francisco-based company is among a string of Silicon 
				Valley unicorns expected to debut in the stock market in 2019. 
				Other IPO hopefuls include apartment-rental service Airbnb Inc, 
				analytics firm Palantir Technologies and Stripe Inc, a digital 
				payment company.
 Ride-hailing company Lyft Inc beat bigger rival Uber 
				Technologies Inc in filing for an IPO this week, defying the 
				recent market jitters that have weighed on corporate valuations.
 
 Slack is rounding up its underwriting syndicate and hopes to 
				fetch a valuation of well over $10 billion in its IPO, whose 
				exact timing will depend on market conditions, the sources said 
				on Friday.
 
 The sources asked not to be identified because the matter is 
				confidential. Slack and Goldman Sachs both declined to comment.
 
 Slack is competing against the likes of Microsoft Corp's <MSFT.O> 
				Teams, Alphabet Inc's <GOOGL.O> Google Hangouts Chat and Cisco 
				Systems Inc's <CSCO.O> Webex Teams in the so-called workplace 
				collaboration market, which research firm IDC has projected will 
				be worth $3.2 billion by 2021.
 
 Slack last raised $427 million in August in a private 
				fundraising round, led by Dragoneer Investment Group and General 
				Atlantic, giving it a valuation of more than $7.1 billion. It 
				previously raised $250 million in 2017 at a $5.1 billion 
				valuation, in a fundraising round led by Japan's SoftBank Group 
				Corp <9984.T>.
 
 It is unclear how market turmoil fueled by the escalating trade 
				tensions between the United States and China could impact 
				Slack's IPO plans.
 
 On Thursday, biotechnology company Moderna Inc <MRNA.O> braved 
				market volatility and sold around $604.3 million in shares in 
				its IPO.
 
 (Reporting by Greg Roumeliotis and Carl O'Donnell in New York; 
				Additional reporting by Joshua Franklin in New York; Editing by 
				Matthew Lewis)
 
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