Petra Security

Petra Security

Provides ITDR platform for Microsoft 365

Overview

Petra Security provides an Identity Threat Detection and Response (ITDR) platform for Microsoft 365, designed for MSSPs and organizations. It continuously monitors Microsoft 365 components such as Active Directory, Exchange, SharePoint, and Teams to detect threats like Business Email Compromise and token theft using data science and adaptive fingerprinting. The platform offers rapid onboarding with a two-click integration, quick threat detection, and the ability to lock out attackers without disrupting employee access, plus detailed reporting and security assessments. Petra's goal is to help security teams investigate and shut down Microsoft 365 attacks quickly, improving protection across the Microsoft ecosystem.

YC Company

About Petra Security

Simplify's Rating
Why Petra Security is rated
C
Rated C on Competitive Edge
Rated B on Growth Potential
Rated D+ on Differentiation

Industries

Data & Analytics

Enterprise Software

Cybersecurity

Company Size

11-50

Company Stage

Seed

Total Funding

$130K

Headquarters

San Francisco, California

Founded

2023

Get referred to Petra Security

See people who can refer or advise you

Simplify Jobs

Simplify's Take

What believers are saying

  • CRN reported mid-seven-figure revenue and 1.5 million protected users by May 2026.
  • AME Group caught 133 BEC attacks from August 2025 to January 2026.
  • Petra serves 400+ channel partners, and partner-led expansion scales quickly across Microsoft tenants.

What critics are saying

  • Microsoft Defender for Identity is bundled inside E5, crushing standalone pricing power in 2026.
  • CrowdStrike, Silverfort, Huntress, and Sophos compete aggressively across identity detection and response.
  • Petra remains tiny at $500K seed versus 122 competitors; one weak cycle kills momentum.

What makes Petra Security unique

  • Built for MSPs, Petra automates M365 ITDR across tenants, not single enterprises.
  • Petra claims 24/7 BEC hunting and attacker lockout without disrupting employee access.
  • One-click tenant onboarding and partner billing integrations make channel deployment unusually fast.

Help us improve and share your feedback! Did you find this helpful?

Funding

Total Funding

$130k

Below

Industry Average

Funded Over

1 Rounds

Notable Investors:
Seed funding is usually the first official round after pre-seed, when a startup has a prototype or concept. It’s typically used to develop the product, test the market, and start building the team. Investors here are often angel investors or early-stage venture capitalists.
Seed Funding Comparison
Below Average

Industry standards

$3.3M
$130k
Petra Security
$1.5M
Slack
$2M
Netflix
$2.3M
Instacart
$3M
Robinhood

Benefits

Health Insurance

Dental Insurance

Vision Insurance

Meal Benefits

Commuting Benefits

Equinox discount

Relocation Assistance

Company Equity

Growth & Insights and Company News

Headcount

6 month growth

14%

1 year growth

0%

2 year growth

-5%
The Business Journals
Apr 3rd, 2024
Here's what you need to know about Y Combinator's 2024 winter batch demo day

Y Combinator seeded more than 250 companies in its current winter batch, which leans heavily into AI. One particular AI subcategory has nearly tripled over the past year.

Recently Posted Jobs

Sign up to get curated job recommendations

Petra Security is Hiring for 11 Jobs on Simplify!

Find jobs on Simplify and start your career today

Don't see your dream role? Check out thousands of other roles on Simplify. Browse all jobs →