+25%

est. 2Y upside i

CybersecuritySeries A

Block bots & bad behavior

Rank

#273

Sector

Cybersecurity

Est. Liquidity

~4Y

Data Quality

Data: Medium

Castle presents a moderate upside opportunity for a job seeker.

Last updated: March 10, 2026

Bull (35%)+350%

Aggressive market penetration and product expansion, particularly in the growing fraud detection and digital identity markets, drive revenue to $12M-$15M within two years. At a premium 25-30x revenue multiple, this could justify a $300M-$450M valuation, representing a 300-500% upside from the estimated current $75M valuation.

Base (40%)+75%

Consistent execution and steady customer acquisition lead to revenue growth to $6M-$8M within two years. Maintaining a healthy 18-22x revenue multiple, the company could reach a $108M-$176M valuation, offering a 40-135% upside from the estimated current $75M valuation.

Bear (25%)-75%

Increased competition from incumbents and well-funded startups, coupled with slower-than-expected market adoption, limits revenue growth to $4M-$5M. A compressed 4-5x revenue multiple due to market pressures or a down round could result in a $16M-$25M valuation, representing a 67-79% downside, significantly impacting common stock value due to liquidation preferences.

Est. time to liquidity~4.0 years

Preference Stack Risk

high

With $14M in total funding and an estimated current valuation of $75M, investors hold approximately 18.67% of the company's value in liquidation preferences.

Dilution Risk

moderate

As a Series A company from 2019, Castle will likely require additional funding rounds (Series B, C) in the next 1-3 years, which will lead to further dilution of common stock.

Secondary Liquidity

none

Given Castle's stage and size, there is currently no active secondary market or tender offers for employee equity.

Engineering & Product — 2 roles

View all 2 open roles at Castle →

Last updated: March 10, 2026

Questions to Ask at the Interview

Strategic questions based on Castle's data — designed to show you've done your homework.

  • 1

    “Given the presence of well-funded incumbents like Sift and DataDome, how does Castle plan to differentiate its offering and capture market share, particularly in the enterprise segment?”

  • 2

    “With current revenue around $3M and profitability, what are the key growth levers and investment areas for the next 24 months to scale revenue significantly while maintaining profitability?”

  • 3

    “As a Series A company from 2019, what is the anticipated timeline and strategy for future funding rounds and ultimately a liquidity event for employees?”

Community

Valuation Sentiment

Our model estimates +25% upside. What do you think?

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Disclaimer: This analysis is AI-generated and does not constitute financial or career advice. Always conduct your own due diligence.