About Defensio
Defensio is a Media & Entertainment company based in San Diego (United States) founded in 2007 by Martijn Enter, and was acquired by Forcepoint in January 2009. Ad blocker and spam filtering solutions are provided by Defensio. It operates in the Media & Entertainment and Technology sectors. The company was acqui-hired. Its focus areas include Enterprise Infrastructure, Cybersecurity, Endpoint Security and Anti Malware. Its competitors include Ghostery, Boltive and PC Matic; 1 of its 3 listed competitors has raised funding.
Company details
Defensio was founded in 2007 and is headquartered in San Diego, United States. Software for web security, spam blockage, and web filtering productivity is developed and offered by the company. Operations focus on ad blocker solutions and spam blocker tools, serving users in the cybersecurity sector. The domain defensio.com is utilized for its online presence, with Martijn Enter listed as the founder.
- Headquarters San Diego, United States
- Founders Martijn Enter
- Stage Acquired
- SectorsMedia & EntertainmentTechnology
- Website defensio.com
- Social X
- Acquired by Forcepoint (Jan 2009)
- Investors
- Acquired byForcepoint
(Jan 2009)
Investors in Defensio
Defensio has secured backing from 1 investor. Prominent investors backing the company include Forcepoint.
| Investor | Description | Founded Year | Domain | Location |
|---|---|---|---|---|
Cyber security suite solution for enterprises | 1994 | forcepoint.com | San Diego, United States |
Investor details for Defensio
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 Defensio
1 people are tracked at Defensio (1 in leadership).
| Name | Role | Group |
|---|---|---|
Martijn Enter | Founder | Leadership |
Complete people profiles for Defensio
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 Defensio
2 dated milestones of Defensio across 2 years, from founding to its latest funding, stage changes and deals.
- Founded Defensio is founded.
- Exit Acquired by Forcepoint.
Competitors of Defensio
Defensio has 3 listed competitors in our database, 1 of them funded. They include Ghostery, Boltive and PC Matic.
| Company Name | Domain | Founded | HQ Location | Total funding | Employees | Description |
|---|---|---|---|---|---|---|
| ghostery.com | 2009 | New York, United States | Provider of browser plug in for blocking ads and tracking for individuals and businesses | |||
| boltive.com | 2016 | Seattle, United States | $14.94M | 21 | Platform offering ad blocker software | |
| pcmatic.com | 1999 | Sioux, United States | Provides antivirus protection, VPN services, and identity theft prevention for devices. |
Detailed competitors of Defensio
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.
Top companies in Advertising & Marketing Tech
3 companies that operate in the same segment as Defensio (Advertising & Marketing Tech) in United States, ranked by their profile score on The Company Check.
| Company | Description | Founded | Location | Total funding | Revenue | Employees |
|---|---|---|---|---|---|---|
AI-powered platform manages marketing creatives and customer journeys. | 1982 | San Jose, California, United States | USD 23.77 B | 30,710 | ||
Ad verification solutions are delivered for digital media campaigns. | 2008 | New York, New York, United States | USD 396.5 M | USD 748.29 M | 1,200 | |
Native advertising solutions are delivered via a cloud-based content platform. | 2006 | New York, New York, United States | USD 403.72 M | USD 1.3 B | 1,800 |
Unlock complete access to The Company Check
Get unrestricted viewing across everything we track β 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 Defensio
Complete news archive for Defensio
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 Defensio
Defensio was founded in 2007.
Defensio is headquartered in San Diego, United States. It is registered at San Diego, California, United States.
Defensio was founded in 2007 and is headquartered in San Diego, United States. Software for web security, spam blockage, and web filtering productivity is developed and offered by the company. Operations focus on ad blocker solutions and spam blocker tools, serving users in the cybersecurity sector. The domain defensio.com is utilized for its online presence, with Martijn Enter listed as the founder.
Defensio has 1 investor. Key investors include Forcepoint.
Yes. Defensio was acquired by Forcepoint in January 2009.

