Slack

Slack Technologies, Inc. operates a business communication platform that facilitates collaboration among teams by integrating messaging, voice and video calls, and file sharing into a cohesive environment. Founded in 2009 and headquartered in San Francisco, California, the company serves a diverse clientele, ranging from Fortune 100 companies to small businesses, helping them streamline communication and enhance productivity. Slack's software is offered under a software-as-a-service model, making it accessible to organizations globally. In addition to its core platform, Slack has established the Slack Fund, which invests in early-stage technology ventures aimed at promoting more efficient workplaces. With multiple offices worldwide, Slack continues to focus on improving the working lives of individuals and teams by bringing together people, applications, and data.

Stewart Butterfield

Co-Founder

Dillon Ferdinandi

Investor

Caroline Fiegel

Investor

Liza Gurtin

Associate Product Manager, Platform

Jason Spinell

Director, Slack Fund

Past deals in Messaging

Courier

Series B in 2022
Courier provides an API that enables developers to manage and route user notifications across various communication channels, such as email and messaging platforms. By leveraging user engagement data and online status, the API optimizes notification delivery, ensuring that messages reach users through the most effective medium. The company's notification management software allows clients to create reusable messages that can be customized for different channels, facilitating timely and targeted communication. Over the years, Courier has adapted to technological advancements while maintaining a stable management approach, emphasizing the importance of customer success. The company has developed long-lasting relationships with its largest clients, continually collaborating to meet their evolving needs.

Yac

Series A in 2021
Yac is a technology company that specializes in digital voice messaging and video communication solutions. Founded in 2019 and based in Kissimmee, Florida, Yac offers a platform that facilitates asynchronous meetings, allowing users to communicate without the need for physical presence. Its services include voice messaging, screen sharing, and tools for team collaboration, making it easier for remote employees to stay connected and organized. The platform also features capabilities such as inbound call management, fax-to-email services, virtual numbers, and audio conferencing, catering to a wide range of business communication needs.

Courier

Series A in 2020
Courier provides an API that enables developers to manage and route user notifications across various communication channels, such as email and messaging platforms. By leveraging user engagement data and online status, the API optimizes notification delivery, ensuring that messages reach users through the most effective medium. The company's notification management software allows clients to create reusable messages that can be customized for different channels, facilitating timely and targeted communication. Over the years, Courier has adapted to technological advancements while maintaining a stable management approach, emphasizing the importance of customer success. The company has developed long-lasting relationships with its largest clients, continually collaborating to meet their evolving needs.

Yac

Venture Round in 2020
Yac is a technology company that specializes in digital voice messaging and video communication solutions. Founded in 2019 and based in Kissimmee, Florida, Yac offers a platform that facilitates asynchronous meetings, allowing users to communicate without the need for physical presence. Its services include voice messaging, screen sharing, and tools for team collaboration, making it easier for remote employees to stay connected and organized. The platform also features capabilities such as inbound call management, fax-to-email services, virtual numbers, and audio conferencing, catering to a wide range of business communication needs.

Loom

Series B in 2020
Loom, Inc. is a San Francisco-based company that develops a video messaging application designed to facilitate work communication. Founded in 2015, Loom allows users to capture, record, and narrate videos that can be instantly shared via a link, streamlining the process of conveying messages without the need to switch applications or upload content. The platform caters to a variety of use cases, including engineering, sales, recruiting, design, marketing, customer support, and leadership. In addition to its video messaging capabilities, Loom also offers a cloud-based photo and video library solution, enabling users to manage their media seamlessly across devices without consuming local storage space. This comprehensive approach addresses the challenges of photo and video management in an era of high-resolution content and limited storage capacity.

Stride

Acquisition in 2018
Stride is a cloud-based communication and collaboration tool designed to enhance team efficiency. Launched by Atlassian in September 2017, it replaces the earlier HipChat platform. Stride offers features such as group chat for discussing ideas in searchable rooms and integrated collaboration tools that allow users to highlight important information directly within conversations. The platform includes a 'Focus Mode' and customizable status settings to indicate when team members need uninterrupted time for tasks. Additionally, it facilitates seamless connectivity through built-in voice and video conferencing for both desktop and mobile users, enabling easy access for team members to join meetings via sharable URLs or guest access. Overall, Stride aims to streamline team communication by integrating context, conversation, and collaboration into a single, effective solution.

HipChat

Acquisition in 2018
HipChat launched in 2010 to give companies and teams a collaboration and chat service that was built just for them. They wanted to combine the power of group chat and the simplicity of consumer IM services with the administrative controls that companies need. In March 2012, HipChat was acquired by Atlassian.

Loom

Seed Round in 2017
Loom, Inc. is a San Francisco-based company that develops a video messaging application designed to facilitate work communication. Founded in 2015, Loom allows users to capture, record, and narrate videos that can be instantly shared via a link, streamlining the process of conveying messages without the need to switch applications or upload content. The platform caters to a variety of use cases, including engineering, sales, recruiting, design, marketing, customer support, and leadership. In addition to its video messaging capabilities, Loom also offers a cloud-based photo and video library solution, enabling users to manage their media seamlessly across devices without consuming local storage space. This comprehensive approach addresses the challenges of photo and video management in an era of high-resolution content and limited storage capacity.

Synervoz

Seed Round in 2017
Synervoz Communications Inc. specializes in developing advanced voice communication technologies, primarily through its flagship application, Switchboard. This application allows users to engage in voice-based interactions while enjoying music or media, creating an experience akin to being in the same room. Switchboard offers features such as real-time balancing of voice and audio content, enabling seamless communication for remote teams and social interactions. The application is compatible with various platforms, including mobile devices, web applications, and desktop systems. Established in 2014 and based in Ingleside, Canada, Synervoz also provides software development kits (SDKs) and demo applications, allowing other companies to incorporate its technology into their own streaming and social applications, thereby enhancing their communication capabilities. The company leverages cutting-edge speech, audio, and machine learning technologies to facilitate a more dynamic and efficient means of interaction.

Myra Labs

Seed Round in 2016
Myra Labs offers APIs that power Slack and Messenger bots, customer service applications, and others that require sophisticated natural language understanding. Myra Labs is building a conversational experience platform. Our APIs provide scalable and highly tunable machine learning services, including state of the art deep learning models, that understand natural language and conversational state. Our mission is to empower developers to build the highest quality user experiences.

Begin

Seed Round in 2015
Begin is a company that specializes in developing and marketing an interactive bot application programming interface aimed at enhancing user communication and collaboration. Founded in 2015 and based in San Francisco, California, Begin's platform allows users to create groups and teams, facilitating the assignment and management of tasks. The company leverages command messaging technology to automate tasks over the Internet, significantly improving organizational teamwork and efficiency. With a focus on creating fully-featured, globally scalable applications, Begin aims to transform static processes into dynamic, collaborative environments for businesses.
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