Directory
Cal Henderson

Cal Henderson

Verified: Jun 2026 (SMTP Validated)👑 Lead Investor
San Francisco, CA
𝕏in
Check Size Range

Flexible Check Size

Preferred Stages
pre-seedseed

Background & Investment Thesis

Co-founder and CTO of Slack. Angel investor in developer tools and infrastructure.

Focus Industries

developer-toolssaasinfrastructureai

Notable Portfolio & Backed Deals

AI Outreach Insight94% Match Score

Active investor in developer-tools, saas, infrastructure, ai. Highly responsive to concise pitches with clear traction metrics.

Unlock Verified Direct Email & Founder Pitch Tools

Get instant access to Cal Henderson's verified mailbox, personalized AI pitch drafts, and 7,400+ active angel profiles.

Key Deal Terms & Quick Facts

Audited venture due diligence summary for Cal Henderson

Verified Deal Signals
Typical Check Size

$100k – $2M

Direct angel check per syndicate / round
Target Stages
pre-seedseed
Early-stage entry valuation priority
Founder Pitch Contact

Verified (Protected — Unlock)

Direct mailbox protected against spam
Focus Industries & Categories
developer-toolssaasinfrastructureai
Notable Backed Deals & StartupsInternal company dossiers
SlackFlickr

Frequently Asked Questions about Cal Henderson

What is Cal Henderson's typical angel check size?▼

Cal Henderson's investment check size typically ranges around $100k – $2M, participating in early-stage financing rounds alongside leading venture capital funds and angel syndicates.

What stages and sectors does Cal Henderson invest in?▼

Cal Henderson primarily backs early-stage startups across pre-seed, seed stages, focusing on developer-tools, saas, infrastructure, ai.

What companies are in Cal Henderson's angel portfolio?▼

Cal Henderson has backed notable companies including Slack, Flickr.

How can startup founders contact or pitch Cal Henderson?▼

Founders can access verified direct email contact channels, AI-assisted pitch drafting, and syndicate warm intro paths for Cal Henderson through OpenAngels.