About Christine Castro: Cybersecurity CMO and Fractional CMO

About Christine Castro

By Christine Castro, Fractional CMO and GTM Advisor · Updated October 12, 2026

Cybersecurity CMO and fractional CMO for Seed to Series C security companies.

Quick answer: Christine Castro is a B2B cybersecurity marketing executive who leads marketing as a CMO or VP of Marketing at pre-IPO cybersecurity companies, and works as a fractional CMO and go-to-market advisor for Seed through Series C security, GRC and security-adjacent companies. She was named to the N.Rich Top 50 GTM Women Voices of the US for 2026, and she builds and publishes free go-to-market tools, including GTM Radar, a nightly job intelligence board covering hundreds of pre-IPO cybersecurity companies.

What she does

Full-time leadership: CMO, VP or SVP of Marketing at pre-IPO cybersecurity companies, typically Seed through Series C.
Fractional CMO and GTM advisory: workshops, scoped projects, part-time and interim leadership. See Fractional CMO for Cybersecurity Companies.
Tools and research: GTM Radar, the Cybersecurity GTM Hiring Index, the GTM Alignment Diagnostic, How to Hire for GTM, Cyber Event Radar and a set of planning tools for budgets, pipeline coverage, events and board reporting.

Experience

Two decades in B2B marketing, most of it leading marketing at cybersecurity startups from seed through growth stage, across identity, endpoint security, data security, threat intelligence and security operations. She has run events and programs across the US, Europe, Israel, the Middle East and Latin America.

Selected results: - Marketing-influenced pipeline from 21% to 73% at a data access security startup. - 3x ARR year over year, marketing sourced. - Endpoints protected from 750,000 to more than 4 million in 18 months. - A marketing team scaled from 2 to 20 at a Series B identity company, with a $4.2 million budget. - A national CISO summit series run two years in a row, and an inaugural user conference that returned 1,112% ROI.

How she works

Every engagement follows Observe, Analyze, Execute, the operating method she developed across her marketing leadership roles: find out what's actually happening, decide what matters most, then act and measure.

Positions she holds: - Marketing is a peer function with its own seat at the executive table. - Security buyers trust evidence, not adjectives. - Pipeline is built by people. AI helps, with a person approving what reaches a customer.

Recognition and appearances

Named to the N.Rich Top 50 GTM Women Voices of the US, 2026.
Guest on Performance Delivered: Insider Secrets to Digital Marketing Success with Steffen Horst, episode "Turning a Layoff into a Pipeline: How I Built an AI Agent to Run My Job Search."

Find her

Work with Christine