About Tessian
Tessian is a Technology company based in San Francisco (United States) founded in 2013 by Tom Adams, and was acquired by Proofpoint in October 2023. AI-driven email security solutions are delivered to prevent recipient errors. Tessian has raised $182.19 million across 9 funding rounds from investors including Okta, Proofpoint and Winton. Tessian was last valued at $51.04 million in March 2018. Its focus areas include Enterprise Infrastructure, Cybersecurity, Email Security and SEG. Its legal entity is TESSIAN LIMITED. Its competitors include Brightmail, Tumbleweed Communications and FrontBridge; 2 of its 3 listed competitors have raised funding.
Company details
Tessian is an AI based email security solutions provider. It provides email security by preventing commercially sensitive emails from being sent to the wrong recipients. The solution employs machine learning to learn from historical user sending patterns to build a graph of the senders social network and detects any recipient mistakes when the user clicks send and reminds them with a pop up to correct the mistake before the email is sent. AI operates as a plugin for existing email clients over the desktop with mobile devices and webmail client support under development. The clients include affirm, Investec, Accel, HILL DICKINSON, etc.
- Headquarters San Francisco, United States
- Founders Tom Adams
- Stage Acquired
- SectorsTechnology
- Email••••••••
- Phone•••• ••••
- Website tessian.com
- Social LinkedIn X Facebook YouTube
- Acquired by Proofpoint (Oct 2023)
- Legal Name Tessian Limited
- Total Equity Funding$182.19M (USD)
in 9 rounds
- Latest Funding Round$9.8M (USD), Series C
Jul 2021
- InvestorsOkta
& 17 more
- Acquired byProofpoint
(Oct 2023)
Apps and channels of Tessian
its YouTube channel Proofpoint has 87.4K subscribers and 30 videos.
Videos from Tessian
The most watched videos on Tessian's YouTube channel, Proofpoint (87.4K subscribers). Click a video to play it here.
More on Proofpoint.
Funding Insights of Tessian
Tessian has successfully raised a total of $182.19M across 9 strategic funding rounds. The most recent funding activity was a Series C round of $9.8 million completed in July 2021. This substantial capital infusion reflects strong investor confidence in the company's business model, growth potential, and market opportunities. The funding enables strategic expansion, product development, market penetration, and operational scaling to drive long-term value creation and competitive advantage.
- Total Funding $182.19M
- Total Rounds 9
- Last Round Series C — $9.8M
- First Round $255,000
(Apr 2014)
- Investors Count 17
All 9 funding rounds of Tessian with amounts and investors; the two latest post-money valuations are shown, the rest are part of the premium plan.
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
|---|---|---|---|---|---|
| Jul 2021 | $9.8M | Series C | – | – | |
| May 2021 | $65M | Series C | – | March Capital | |
| Jan 2019 | $42M | Series B | – | Sequoia Capital | |
| Oct 2018 | Series A | – | Microsoft Accelerator | – | |
| Mar 2018 | $58.7M | Series A | – | Balderton Capital | |
| Apr 2017 | $2.7M | Seed | – | Accel, LocalGlobe | |
| Jul 2016 | $3.4M | Seed | $11.17M | – | – |
| Jun 2015 | $338,000 | Seed | $1.87M | – | – |
| Apr 2014 | $255,000 | Seed | $••••• | – | – |
| Date | Valuation | Stage |
|---|---|---|
| Mar 2018 | $51.04M | •••••••• |
| Jul 2016 | $11.17M | •••••••• |
| Jun 2015 | $••••• | •••••••• |
| Apr 2014 | $••••• | •••••••• |
Full valuation and stage history of Tessian
Every valuation point, the growth-stage changes (minicorn, soonicorn, unicorn) and the dates behind them require an active premium plan.
- All valuation points
- Stage changes
- Dates
- Exports
Verified entity values are shown only after access is granted.
Last known valuation $51.04M (Mar 2018). 18 investors in total: 18 institutional.
Investors in Tessian
Tessian has secured backing from 18 investors, including institutional and venture fund investors. Prominent investors backing the company include Okta, Proofpoint and Winton.
| Investor | Description | Founded Year | Domain | Location |
|---|---|---|---|---|
Corporate venture capital firm backed by Citi | citi.com/ventures | San Francisco, United States | ||
Venture capital firm focused on multiple sectors | sozoventures.com | Redwood City, United States | ||
Sequoia Capital is engaged in venture capital investments. | 1972 | sequoiacap.com | ||
Accel is recognized as a leading venture capital firm. | 1983 | accel.com | Palo Alto, United States | |
Multistage venture capital investments are focused on technology sectors. | 2000 | balderton.com | London, United Kingdom | |
Venture capital firm focused on seed-stage investments | localglobe.vc | London, United Kingdom | ||
Enterprise startups are accelerated through Microsoft's global mentoring program. | microsoftaccelerator.com | Paris, France | ||
Early-stage deep technology investments are made by Amadeus Capital. | amadeuscapital.com | London, United Kingdom | ||
Early-stage tech investments in Europe are made by Walking Ventures. | walking.vc | London, United Kingdom | ||
Investments in early-stage software companies are managed by the firm. | crane.vc | London, United Kingdom |
Investor details for Tessian
The complete investor list, round-by-round participation and investor portfolios require an active premium plan.
- Complete investor list
- Round participation
- Investor portfolios
- Co-investor network
Verified entity values are shown only after access is granted.
People of Tessian
1009 people are tracked at Tessian (227 in leadership, 6 in board & advisors, 776 in team).
| Name | Role | Group |
|---|---|---|
Tom Adams | Co-Founder | Leadership |
Edward Bishop | Leadership | |
Jeannine Kilroy | Regional Sales Director | Leadership |
Yanina Sotelo | Sr. People Strategy Partner Manager | Leadership |
Patrick Hermanspann | Director Strategic Accounts DACH | Leadership |
Brian Adams | Vice President, Service Reliability Engineering | Leadership |
Gurvi Singh | Director Of Corporate Accounting | Leadership |
Michael Reading | Vice President Of Technical Services, Cloudmark Business | Leadership |
Sebastian Joll | Head Of Customer Success | Leadership |
Stuart Horwood | Director, Named Accounts Uki&sa | Leadership |
Jon Sarginger | Director Global Channel Sales Operations | Leadership |
Uri Polsky | Director Technical Support Services | Leadership |
Robert MacKett | Vice President & Country Leader - Canada | Leadership |
Dave Ely | Senior Director, Product Management - Digital Communications Governance | Leadership |
Blake Gabriel | Director Field Sales, Named Accounts | Leadership |
Joyce Kim | Chief Marketing Officer | Leadership |
Rohit Dixit | Chief Customer Officer | Leadership |
Ron Poserina | Vice President, Americas Systems Engineering | Leadership |
Kim Greenia | Director, Talent Acquisition | Leadership |
Vaishali Sabhahit | Senior Director, Global Talent Acquisition – Strategic Programs | Leadership |
989 more people are available in the full profile.
Complete people profiles for Tessian
Full employee and board profiles, team structure, tenure and professional contact details require an active premium plan.
- Full employee list
- Team structure
- Board tenure
- Professional contacts
Verified entity values are shown only after access is granted.
Timeline of Tessian
5 dated milestones of Tessian across 10 years, from founding to its latest funding, stage changes and deals.
- Founded Tessian is founded.
- Funding First funding round of $255K.
- Milestone Reaches Minicorn status.
- Funding Latest funding round, Series C, of $9.8M.
- Exit Acquired by Proofpoint.
Competitors of Tessian
Tessian has 3 listed competitors in our database, 2 of them funded. They include Brightmail, Tumbleweed Communications and FrontBridge.
| Company Name | Domain | Founded | HQ Location | Total funding | Employees | Description |
|---|---|---|---|---|---|---|
| brightmail.com | 1998 | San Francisco, United States | $35M | Anti-spam solutions and web filtering tools are provided for ISPs. | ||
| tumbleweed.com | 1993 | Redwood, United States | Encryption-based email security, anti-spam, and managed file transfer are offered. | |||
| frontbridge.com | 2002 | Los Angeles, United States | $18M | Coud-based secure email gateway for filtering, encryption, and archiving |
Detailed competitors of Tessian
The full competitor set, operating metrics and side-by-side benchmarks require an active premium plan.
- Full competitor set
- Operating metrics
- Benchmarks
- Competitive positioning
Verified entity values are shown only after access is granted.
Web traffic of Tessian
The website of Tessian (tessian.com) receives about 1.4K visits a month.
- Monthly visits1.4K
▼ 67.4% vs previous month
Websites whose visitors overlap most with Tessian. Affinity shows how closely the audiences match.
| Website | Domain | Audience affinity | Monthly visits | Global rank | Profile |
|---|---|---|---|---|---|
| proofpoint.com | 100% | 2.1M | #25,500 | View details |
Top companies in Cybersecurity & Data Protection
3 companies that operate in the same segment as Tessian (Cybersecurity & Data Protection) in United States, ranked by their profile score on The Company Check.
| Company | Description | Founded | Location | Total funding | Revenue | Employees |
|---|---|---|---|---|---|---|
Cloud based website security solutions | 2009 | San Francisco, California, United States | USD 332.1 M | USD 1.67 B | 7,330 | |
Cybersecurity and zero trust solutions are delivered for secure networks. | 2007 | San Jose, California, United States | USD 148 M | USD 3.35 B | 9,616 | |
Cloud-based identity management solutions are provided for enterprises. | 2002 | Denver, Colorado, United States | USD 136.89 M | USD 36.94 M | 821 |
Unlock complete access to The Company Check
Get unrestricted viewing across everything we track — from companies and brands to investors, funding rounds, acquisitions, financials, and more.
- Unlimited viewing on all profiles Companies, investors, financials, funding, acquisitions & directors
- Full access to every database India & global coverage, advanced filters and rich profile details
- Always-on access from your team account Single premium plan for everything you see on the portal
Related news about Tessian
Complete news archive for Tessian
Full article history, source details, and older brand coverage require an active premium plan.
- Full article archive
- Source and publication date
- Older coverage
- Brand-specific news history
Verified entity values are shown only after access is granted.
Frequently Asked Questions about Tessian
Tessian was founded in 2013 and raised its 1st funding round 1 year after it was founded.
Tessian is headquartered in San Francisco, United States. It is registered at San Francisco, California, United States.
Tessian is a funded company, having raised a total of $182.19M across 9 funding rounds to date. The company's 1st funding round was a Seed of $255K, raised on Apr 2014.
Tessian is an AI based email security solutions provider. It provides email security by preventing commercially sensitive emails from being sent to the wrong recipients. The solution employs machine learning to learn from historical user sending patterns to build a graph of the senders social network and detects any recipient mistakes when the user clicks send and reminds them with a pop up to correct the mistake before the email is sent. AI operates as a plugin for existing email clients over the desktop with mobile devices and webmail client support under development. The clients include affirm, Investec, Accel, HILL DICKINSON, etc.
Tessian's top competitors include Brightmail, Tumbleweed Communications and FrontBridge.
Tessian has 18 investors. Key investors include Okta, Proofpoint, Winton, Citi, and Accel.
The valuation of Tessian is $51.04M as of Mar 2018.
Tessian operates through Tessian Limited.
Yes. Tessian was acquired by Proofpoint in October 2023.