Slack is no longer an independent entity; it is a wholly-owned subsidiary of Salesforce, the global leader in Customer Relationship Management (CRM) software. The ownership transition was finalized in July 2021, marking one of the largest acquisitions in the history of the software industry. While Slack continues to operate under its own brand name and maintains its unique culture, its strategic direction, financial backing, and product roadmap are now governed by the broader Salesforce ecosystem.

The acquisition of Slack for approximately $27.7 billion fundamentally changed the landscape of enterprise communication. To understand who owns Slack today, one must look beyond the corporate logo and examine the strategic marriage between a messaging powerhouse and a CRM giant.

The Current Ownership Status of Slack

As of today, Salesforce (NYSE: CRM) is the sole owner of Slack. The deal, which was first announced in December 2020 and closed on July 21, 2021, integrated Slack as a core pillar of Salesforce’s "Customer 360" platform. Under the terms of the agreement, Slack shareholders received $26.79 in cash and 0.0776 shares of Salesforce common stock for each Slack share.

Since the acquisition, Slack has been categorized as an operating unit within Salesforce. This means that while Slack has its own CEO and internal teams, its financial performance is reported as part of Salesforce’s professional services and collaboration segment. This ownership structure allows Slack to leverage Salesforce’s massive global sales force and deep enterprise relationships, which has been critical in its ongoing competition with Microsoft Teams.

The Architects Behind Slack: From Founders to Corporate Leaders

While Salesforce is the corporate owner, the identity of Slack is inextricably linked to its founders. The platform was launched in 2013 by a team of serial entrepreneurs who had previously seen massive success in the tech world.

The Original Founders

Slack was founded by Stewart Butterfield, Eric Costello, Cal Henderson, and Serguei Mourachov. Before Slack, Butterfield was best known as the co-founder of the photo-sharing site Flickr, which was sold to Yahoo in 2005. The founding team’s experience in creating highly social, user-friendly interfaces was a primary reason Slack felt different from the "stiff" enterprise software that preceded it.

The Leadership Transition

The ownership change also led to a significant shift in leadership. Stewart Butterfield served as the CEO of Slack for nearly a decade, continuing in the role for over a year after the Salesforce acquisition. However, in late 2022, Butterfield announced his departure from the company.

He was initially succeeded by Lidiane Jones, a seasoned Salesforce executive. In late 2023, the leadership changed again when Denise Dresser was appointed as the CEO of Slack. Dresser, who had previously served as a top executive within Salesforce, was tasked with further integrating Slack’s messaging capabilities into the Salesforce CRM workflow and spearheading the company’s push into Artificial Intelligence (AI).

The $27.7 Billion Merger: Why Salesforce Bought Slack

The decision for Salesforce to acquire Slack was not merely about adding a chat tool to its portfolio. It was a strategic move to define the "future of work." Marc Benioff, the Chair and CEO of Salesforce, described the deal as a "match made in heaven" that would create the "operating system for the new way to work."

Creating the Digital HQ

Salesforce’s vision for Slack is the "Digital HQ." In an era where hybrid and remote work have become standard, Salesforce recognized that companies needed a digital space that acted as the central nervous system for their operations. By owning Slack, Salesforce can offer a unified platform where employees can communicate, access customer data, and automate workflows without ever leaving the chat interface.

The Data Advantage

Ownership allows Salesforce to bridge the gap between "front-office" communication and "back-office" data. When a sales representative discusses a lead in a Slack channel, that data can now flow seamlessly into the Salesforce CRM. This integration reduces context switching—the productivity-killing habit of jumping between different apps—and provides a "single source of truth" for business data.

The Origin Story: How a Failed Video Game Led to a Tech Giant

The path to Salesforce ownership was unconventional. Slack was not originally intended to be a business communication tool. It began as an internal project within a company called Tiny Speck.

The Glitch Era

The founding team was actually building a massive multiplayer online game called Glitch. During the development process, the team found themselves scattered across different cities (Vancouver, San Francisco, and New York). They needed a better way to communicate than what was available at the time. They built a custom tool based on the IRC (Internet Relay Chat) protocol to manage their files and conversations.

The Pivot

When Glitch failed to gain commercial traction in 2012, Butterfield and his team realized that the game wasn't the most valuable thing they had built—the communication tool was. They pivoted the company, renamed the tool "Slack" (an acronym for "Searchable Log of All Conversation and Knowledge"), and officially launched it in August 2013. This pivot is often cited in business schools as one of the most successful examples of identifying a secondary product as the primary value driver.

Financial Milestones: From Bootstrapping to a Direct Listing

Before Salesforce took over, Slack was a darling of the venture capital world. Its ownership history involved several rounds of high-profile investments that valued the company at billions of dollars long before it went public.

Early Funding Rounds

Slack’s early days were bootstrapped using the proceeds from the Flickr sale, but it quickly attracted institutional interest. In April 2014, Slack raised $1.5 million in seed funding. This was followed by a Series A and Series B that saw participation from major firms like Accel Partners and Andreessen Horowitz. By 2015, Slack had raised hundreds of millions of dollars, achieving "Unicorn" status with a valuation exceeding $1 billion.

The 2019 Direct Listing

In a move that challenged traditional Wall Street norms, Slack chose a direct listing on the New York Stock Exchange (NYSE) in June 2019 rather than a traditional IPO. Unlike an IPO, where a company creates new shares and uses underwriters to sell them, a direct listing allows existing shareholders (employees and early investors) to sell their shares directly to the public. On its first day of trading, Slack’s market value reached approximately $19.5 billion.

This move provided liquidity to the original owners and investors, but it also placed Slack under the scrutiny of public markets, eventually making it an attractive acquisition target for a giant like Salesforce that was looking to expand its cloud dominance.

The Shift in Leadership: Who Runs Slack Today?

Navigating the transition from a founder-led startup to a division of a Fortune 500 company is a complex process. The current leadership at Slack reflects Salesforce’s desire to deeply embed the tool into its corporate DNA.

Denise Dresser, the current CEO, brings over 20 years of experience in the technology and business sectors. Her focus has been on "Slack AI," a suite of generative AI tools built directly into the platform to summarize threads and search for information across a company’s entire history. This shift highlights how the "owner" of the company dictates its technological focus—moving Slack from a simple messaging app to an AI-driven productivity engine.

The Impact of Ownership on the Platform’s Future

Many long-time Slack users wondered if Salesforce ownership would ruin the app’s "cool" factor or its user-friendly interface. While the core experience remains intact, several changes have emerged as a direct result of Salesforce’s stewardship.

Enterprise Scale and Security

Salesforce has pushed Slack further into the "Enterprise" space. This means better security protocols, compliance certifications, and the ability to handle hundreds of thousands of users within a single organization. Features like Slack Connect, which allows different companies to collaborate in shared channels, have become a cornerstone of the platform’s growth strategy under Salesforce.

Integration with Salesforce Clouds

Slack is now being woven into every "Cloud" Salesforce offers—Sales Cloud, Service Cloud, Marketing Cloud, and Commerce Cloud. For example, when a customer service ticket is opened in Salesforce Service Cloud, an automated alert can be sent to a dedicated Slack channel, allowing the team to swarm the issue and resolve it faster. This level of integration was only possible through unified ownership.

The Competition with Microsoft

The ownership by Salesforce provides Slack with the financial "war chest" needed to fight Microsoft Teams. Microsoft includes Teams for "free" in many Office 365 bundles, which has been a major challenge for Slack. With Salesforce’s backing, Slack can offer deep integrations that Microsoft cannot easily replicate, particularly for companies that rely on Salesforce for their customer data.

Conclusion

To answer the question of "who owns Slack," the legal and corporate answer is Salesforce. However, the "ownership" of Slack’s spirit and innovation remains a blend of its original founders' vision and the massive scale provided by Marc Benioff’s enterprise empire.

From its humble beginnings as an internal tool for a struggling game company to its current status as a $27.7 billion "Digital HQ," Slack’s journey is a testament to the power of pivoting and the strategic value of enterprise collaboration. Today, as part of Salesforce, Slack is evolving from a place where people talk into a platform where work actually gets done through AI and data integration.

Frequently Asked Questions About Slack Ownership

Is Slack still its own company?

No, Slack is a subsidiary of Salesforce. It was acquired in 2021 and is no longer an independently traded company on the stock exchange.

Who is the CEO of Slack now?

The current CEO of Slack is Denise Dresser. She took over the role in late 2023, following the departure of Lidiane Jones and the original founder, Stewart Butterfield.

How much did Salesforce pay for Slack?

Salesforce acquired Slack for approximately $27.7 billion in a deal involving both cash and Salesforce stock.

Why did Stewart Butterfield leave Slack?

Stewart Butterfield left Slack in late 2022, about a year and a half after the acquisition was finalized. While he did not cite a specific conflict, it is common for founders to depart after their "lock-up" periods or transition phases following a large acquisition.

Does Slack work with other CRMs besides Salesforce?

Yes. Despite being owned by Salesforce, Slack maintains its "open ecosystem" philosophy. It continues to offer integrations with thousands of other apps, including competitors like HubSpot, Zendesk, and Oracle, though its integrations with Salesforce are understandably the most robust.

What was Slack's name before it was Slack?

The company was originally called Tiny Speck. The communication tool itself was a side project during the development of a game called Glitch.

Was Slack an IPO or a direct listing?

Slack went public via a direct listing on the New York Stock Exchange in June 2019, rather than using the traditional Initial Public Offering (IPO) route.