• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
FinanceVenture Capital

Why Slack just raised $160 million at a $2.8 billion valuation

By
Dan Primack
Dan Primack
Down Arrow Button Icon
By
Dan Primack
Dan Primack
Down Arrow Button Icon
April 16, 2015, 12:52 PM ET
Slack CEO Stewart Butterfield
Stewart Butterfield, co-founder and chief executive officer of Slack, stands for a photograph after a Bloomberg West Television interview in San Francisco, California, U.S., on Wednesday, Nov. 12, 2014. Slack, a software service company helping teams of co-workers to converse, work on projects together, and share links, pictures and more in real time, recently raised $120 million and is now valued at $1.12 billion. Photographer: David Paul Morris/Bloomberg via Getty ImagesPhotograph by David Paul Morris — Bloomberg/Getty Images

Workplace collaboration platform Slack today made official what has been rumored for weeks: It has raised $160 million in new venture capital funding at a post-money valuation of $2.8 billion.

But one big question remains: Why?

Slack raised $120 million just last October at a $1.12 billion valuation and, at the time, didn’t even need the money. Instead, it simply wanted to join the (then less) exclusive unicorn club. So why go back to the well?

Company co-founder and CEO Stewart Butterfield explains: “We’re kind of in the best environment ever to raise money and while things could always get better and we’ll wish we had waited another six months, having a couple hundred million bucks in the bank is a good hedge about what might happen in the future.”

(If this argument sounds familiar, it’s probably because we put it forth last month)

Butterfield, who says Slack still has not tapped any of last October’s $120 million, adds that he’s not terribly concerned that a macro pullback might lead to Slack later raising new capital at a lower valuation. “There’s always some downside risk to any business deal, but we’re very capital efficient and never really need to raise money again,” he says. “This valuation helps us recruit new employees and gives a high value to our stock when contemplating acquisitions… It would have been imprudent of me not to take it when it was offered.”

Does that mean Butterfield would raise another $160 million at a larger valuation in six months?

“If we could double our valuation again, I’d certainly think about it,” he says.

New investors on this funding round include Li Ka-shing’s Horizons Ventures, DST Global, Index Ventures, Spark Capital and Institutional Venture Partners. Return backers were Andreessen Horowitz, The Social+Capital Partnership, Google Ventures and Kleiner Perkins Caufield & Byers.

Get Term Sheet, our daily newsletter on deals and deal-makers.

About the Author
By Dan Primack
See full bioRight Arrow Button Icon

Latest in Finance

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
Sections
  • Finance
  • Leadership
  • Success
  • Tech
  • Asia
  • Europe
  • Environment
  • Fortune Crypto
  • Health
  • Retail
  • Lifestyle
  • Politics
  • Newsletters
  • Magazine
  • Features
  • Commentary
  • Mpw
  • CEO Initiative
  • Conferences
  • Personal Finance
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

© 2026 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.


Most Popular

placeholder alt text
Big Tech
The Chan Zuckerberg Initiative cut 70 jobs as the Meta CEO’s philanthropy goes all in on mission to 'cure or prevent all disease'
By Sydney LakeFebruary 1, 2026
1 day ago
placeholder alt text
Success
U.S. Olympic gold medalist went from $200,000-a-year sponsorship at 20 years old to $12-an-hour internship by 30
By Orianna Rosa RoyleFebruary 1, 2026
1 day ago
placeholder alt text
Economy
'I just don't have a good feeling about this': Top economist Claudia Sahm says the economy quietly shifted and everyone's now looking at the wrong alarm
By Eleanor PringleJanuary 31, 2026
2 days ago
placeholder alt text
Future of Work
Ford CEO has 5,000 open mechanic jobs with up to 6-figure salaries from the shortage of manually skilled workers: 'We are in trouble in our country'
By Marco Quiroz-GutierrezJanuary 31, 2026
2 days ago
placeholder alt text
Success
Ryan Serhant starts work at 4:30 a.m.—he says most people don’t achieve their dreams because ‘what they really want is just to be lazy’
By Preston ForeJanuary 31, 2026
2 days ago
placeholder alt text
Energy
Top energy expert says probability the U.S. will attack Iran soon is 75% as risk of major disruption to oil supply is priced in — 'this one is real'
By Jason MaFebruary 1, 2026
21 hours ago

Latest in Finance

a person holds a smartphone displaying the Moltbook logo
CybersecurityTech
Top AI leaders are begging people not to use Moltbook, the AI agent social media: ‘disaster waiting to happen’
By Eva RoytburgFebruary 2, 2026
27 seconds ago
Closeup of US President Donald Trump as he speaks in the Oval Office of the White House.
InnovationPolitics
It took the U.S. decades to respond to the 1970s energy shock with a strategic oil reserve, now it’s rerunning that playbook with rare earths
By Tristan BoveFebruary 2, 2026
4 minutes ago
The Sallie Mae Bank logo on a green layered background.
Personal FinanceCertificates of Deposit (CDs)
Sallie Mae CD rates 2026: Excellent returns (and not just for students)
By Joseph HostetlerFebruary 2, 2026
26 minutes ago
The Popular Direct logo on a green layered background.
Personal FinanceCertificates of Deposit (CDs)
Popular Direct CD rates 2026
By Joseph HostetlerFebruary 2, 2026
37 minutes ago
CryptoDonald Trump
How a ‘spy sheikh’ bought 49% of the Trump family’s flagship crypto company: ‘We’ve got some pretty meaningful investors’
By Ben WeissFebruary 2, 2026
51 minutes ago
US President Donald Trump speaks before signing executive orders in the Oval Office in the White House in Washington, DC, on January 30, 2026.
EconomyTariffs and trade
Trump ‘woke the rest of the world up’ to leveraging economic firepower against trade partners, says Morgan Stanley CIO
By Eleanor PringleFebruary 2, 2026
1 hour ago