Tim Sadler
Co-Founder & CEO @ Tessian
London, United Kingdom
Tim Sadler is a seed investor at Tessian in London focused on Software and Information Technology. Tim is the CEO and co-founder of CheckRecipient, a next generation email security platform which uses machine learning to predict when emails are being sent to the wrong people. Some of the world's largest organisations across the financial and legal sectors are using CheckRecipient and in the past 6 months the company has been crowned"Best Security Startup" by WIRED, "Best Machine Intelligence Startup" by Legal Geek and "Best Startup - Gold Category" by Info Security Products Guide. Tim was recently listed as one of Forbes "30 Under 30" in European Technology for 2017.
- Total investments:
- 12
- Last investment:
- Lead investor:
- 0%
Last updated:
For AI agents: llms.txt
Industries Tim Sadler invests in
Stages Tim Sadler invests in
Countries Tim Sadler invests in
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
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Investment Focus
Industry
- Software 4 (33%)
- Information Technology 4 (33%)
- Artificial Intelligence 4 (33%)
- Analytics 2 (17%)
- Open Source 2 (17%)
Stage
- Seed 7 (58%)
- Pre-Seed 4 (33%)
- Series A 1 (8%)
Country
- United Kingdom 6 (50%)
- United States 4 (33%)
- Germany 1 (8%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
SuperPlane
|
SuperPlane is an AI-first platform engineering and DevOps control plane that helps teams automate, orchestrate, and manage complex operational workflows across development, deployment, infrastructure, monitoring, and incident-response tools | $2.6M / Pre-Seed / Jun 24, 2026 | |
Cakewalk
|
Cakewalk is the easiest Identity & Access Management. Cakewalk exists to enable fast-moving companies to regain control over the software they use. Made for IT & Security teams. And the actual users of software: your employees. | $7.5M / Seed / Apr 23, 2025 | |
Civic Marketplace
|
Civic Marketplace is a platform that simplifies purchasing decisions, helps agencies make efficient, informed choices, and boosts local economic growth by providing access and opportunities to historically underutilized businesses. | $3.2M / Seed / Nov 20, 2024 | |
Userled
|
Userled is a no-code interface and AI-powered platform that automates the distribution of personalizing marketing experiences across all ad and email platforms, empowering revenue teams with person-level engagement insights without cookies. Customers can deploy multiple personalized campaigns across all their target platforms from email, Linkedin,Meta, and more. | $5.1M / Pre-Seed / Aug 09, 2024 | |
Tracebit
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Tracebit is a cloud-native method to intrusion detection, using decoys to identify and respond to intrusions. | $5M / Seed / Jul 09, 2024 | |
Maze
|
Maze a platform that uses AI agents to investigate and resolve cloud security vulnerabilities. | Pre-Seed / Dec 01, 2023 | |
|
Tracebit
|
Tracebit is a cloud-native method to intrusion detection, using decoys to identify and respond to intrusions. | Pre-Seed / Mar 01, 2023 | |
Surfboard
|
Surfboard provides scheduling and building workforce management through customer service software. | $4.9M / Seed / Nov 21, 2022 | |
Lightdash
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Open source BI for your whole team | $8.4M / Seed / Oct 06, 2022 | |
Lightdash
|
Lightdash is the future of BI - an AI-first, open-source analytics platform that gives modern data teams the fastest path to true self-serve analytics. We integrate seamlessly with dbt and your existing stack, combining an open semantic layer, AI-powered analytics, and the best developer experience in BI.Lightdash is trusted by fast-growing,data-driven companies worldwide to cut reporting bottlenecks, reduce BI costs, and ship analytics users actually adopt. | $6M / Seed / Oct 06, 2022 | |
| See all 12 investments → | |||
Co-Investors
About Tessian
Tessian’s mission is to secure the human layer. Using machine learning technology, Tessian automatically stops data breaches and security threats caused by human error - like data exfiltration, accidental data loss, business email compromise, and phishing attacks - with minimal disruption to employees' workflow. As a result, employees areempowered to do their best work, without security getting in their way. Founded in 2013, Tessian is backed by renowned investors like Sequoia, Accel, March Capital, and Balderton, and has offices in San Francisco and London.
Tessian Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Ayush Kumar
Product
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Edward Bishop
Co-Founder & CTO
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Elaine Mao
Head of Biz Ops
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Henry Trevelyan Thomas
Head of Client Development
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Martine Ehrlich
Engineering Manager
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FAQ
What does Tim Sadler invest in?
Tim Sadler invests primarily in Software, Information Technology and Artificial Intelligence startups, most often at Seed and Pre-Seed stage. Most of the 12 investments tracked by Shizune back companies in United Kingdom. The Investment Focus section breaks down every industry, stage and country in the portfolio.
How do I contact Tim Sadler?
Public channels for Tim Sadler include LinkedIn and X (Twitter). For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Tim Sadler last invest?
The most recent investment recorded for Tim Sadler closed in Jun 2026. Shizune tracks 12 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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