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Cal Henderson
AddedFeb 13, 2024
UpdatedJun 28, 2026
Cal Henderson

Cal Henderson

Co-founder & CTO, Slack

The Org

Cal Henderson's Career

Slack
Slack

San Francisco, CA, US

Co-founder & CTO
Slack Fund
Slack Fund

San Francisco, CA, US

Co-Founder

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Cal Henderson's Career

Slack
Slack
Acquired Subsidiary$28.5B02009San Francisco, CA, US
Co-founder & CTO

Recent news

Salesforce Signs Definitive Agreement to Acquire SlackSalesforce · 2020
Reimagining the company directorySlack · 2020
Slack direct listing stock begins trading on New York Stock ExchangeCNBC · 2019

Leadership at Slack

Rob SeamanRob SeamanSVP Enterprise Product
Stewart ButterfieldStewart ButterfieldCo-founder & CEO

Similar to Slack

Rocket.chatRocket.chatPorto Alegre, Rio Grande do Sul, BRCommunicationest. 2015Rocket.chatPorto Alegre, Rio Grande do Sul, BR · est. 2015

Rocket.Chat: A global open-source platform centralizing communication and customer support for companies.

Series A Bridge · $36.9M350
AlphabetAlphabetMountain View, CA, USAdvertising, Softwareest. 1998AlphabetMountain View, CA, US · est. 1998

Alphabet Inc. is the parent holding company of Google, investing in search, advertising, cloud computing, AI, and consumer technology businesses.

Public · $26.1M190.8k
MattermostMattermostPalo Alto, CA, USAI Platform, Collaboration Platform, Cybersecurity, DevOps, Workflow Softwareest. 2016MattermostPalo Alto, CA, US · est. 2016

Mattermost is the leading sovereign collaboration and AI platform for mission-critical defense and critical infrastructure.

Pre-Seed · $74.6M139
Felix for SlackFelix for SlackSan Francisco, CA, USAI Softwareest. 2022Felix for SlackSan Francisco, CA, US · est. 2022

Felix, a San Francisco-based software company, enhances your Slack writing with generative AI.

Pre-Seed · $500k5
Slack Fund
Slack Fund
Investment FirmInvestment Firm$1.4B2.5k2013San Francisco, CA, US
Co-Founder

Recent news

Y Combinator-backed Rulebase wants to be the AI coworker for fintechTechCrunch · 2025
Datadog challenger Dash0 aims to dash observability bill shockTechCrunch · 2024
Dust grabs another $16 million for its enterprise AI assistants connected toninternal dataTechCrunch · 2024

Leadership at Slack Fund

John O'FarrellJohn O'FarrellBoard Member
Andrew BracciaAndrew BracciaBoard Member
Graham V SmithGraham V SmithBoard Member
Sarah FriarSarah FriarBoard Member
Hans TungHans TungBoard Member
Lidiane JonesLidiane JonesCEO

Cal Henderson's Co-Investors

Praveen Neppalli NagaPraveen Neppalli NagaCo-invested · Linear Series BAnssi RusiAnssi RusiCo-invested · Linear Series BKristo OvaskaKristo OvaskaCo-invested · Linear Series BAkash GargAkash GargCo-invested · Linear Series BKoen BokKoen BokCo-invested · Linear Series BAndrew MasonAndrew MasonCo-invested · Linear Series BGuillermo RauchGuillermo RauchCo-invested · Linear Series BIlkka PaananenIlkka PaananenCo-invested · Linear Series B

Cal Henderson's Similar Executives & Operators

Nugroho HerucahyonoNugroho HerucahyonoCo-Founder · BukalapakAchmad ZakyAchmad ZakyCo-Founder · BukalapakChi-hyung SongChi-hyung SongCo-Founder · DunamuHaeil YiHaeil YiCo-Founder · DunamuHyoung-nyon KimHyoung-nyon KimCo-Founder · DunamuWILL WEI CHENGWILL WEI CHENGCo-Founder · DiDiBo ZhangBo ZhangCo-Founder · DiDiDhirubhai H. AmbaniDhirubhai H. AmbaniFounder · Reliance Retail

People Similar to Cal Henderson

Andrew SlackAndrew SlackFounder · Slack Venture CapitalParker HarrisParker HarrisCo-Founder · SalesforceGurminder Deep SinghGurminder Deep SinghCo-Founder · SlipsBen HowdleBen HowdleCo-Founder · Letter