When was Castle founded?

Castle was founded in 2015 and raised its 1st funding round 1 year after it was founded.

Where is Castle located?

Castle is headquartered in San Francisco, United States. It is registered at San Francisco, California.

How many employees does Castle have?

As of Mar 31, 2026, the latest employee count at Castle is 48.

Is Castle a funded company?

Castle is a funded company, having raised a total of $13.7M across 3 funding rounds to date. The company's 1st funding round was a $***** Seed round, raised on Mar 21, 2016.

When was the latest funding round of Castle?

Castle's latest funding was a $***** Series A round on Feb 11, 2019, with participation from 7 investors.

Where does Castle rank among its competitors?

Castle ranks 59th amongst 2426 active competitors, of which 424 are funded. It stands 11th in terms of total funding among its competitors. The most recent competitor to raise funding was Evrotrust, which secured $7.61M in Nov, 2025.

Who are the top competitors of Castle?

Castle's top competitors include ComplyAdvantage, Megvii and Kairos. Among them, Evrotrust secured the most recent funding round in November, 2025.

Castle - 2026 Company Profile, Team, Funding & Competitors

Company Details

Provider of infrastructure to detect and prevent bots, abuse, and fraud. It offers tools for device fingerprinting, bot detection, and behavioral analysis. The platform provides real-time risk assessment using custom rules and machine learning. It supports API protection, account takeover prevention, and multi-accounting restrictions. The infrastructure allows for custom security flows and state management.

Website: castle.io
Social
Registered Address: San Francisco, California

Key Metrics

Founded Year

2015

Location

San Francisco, United States

Stage

Series A

Total Funding

$13.7M in 3 rounds

Latest Funding Round

Series A, Feb 11, 2019, $*****

Investors

Y Combinator & 17 more

Ranked

59^th among 2426 active competitors

Employee Count

48 as on Mar 31, 2026

Similar Companies

Kairos & 2460 more

View Castle's full profile

Castle is associated with 2 legal entities given below:

Legal Entity Name	Date of Incorporation	Revenue	Latest Employee Count	Documents
CASTLE INTELLIGENCE, INC. CIN: 371799337 , United States, Active	Dec 31, 1999	-	8 (As on Dec 31, 2021)	-
CASTLE INTELLIGENCE, INC. CIN: 20238317536 , United States, Active	Dec 23, 2023	-	-	-

Castle has raised a total funding of $13.7M over 3 rounds. Its first funding round was on Mar 21, 2016. Its latest funding round was a Series A round on Feb 11, 2019 for $*****. 7 investors participated in its latest round. Castle has 15 institutional investors and 3 angel investors.

Here is the list of recent funding rounds of Castle:

Date of Funding	Funding Amount	Round Name	Post-Money Valuation	Revenue Multiple	Lead Investors	Other Investors
Feb 11, 2019	6817655	Series A	9491952	2554573	6606373	6838685
Nov 09, 2016	5656312	Seed	8274841	7722502	6167250	F-Prime Capital & 1 more
Mar 21, 2016	4507668	Seed	2490423	4816752	Y Combinator	7650044

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View details of Castle's funding rounds and investors

The founders of Castle are Sebastian Wallin and Johan Brissmyr.

Here are the details of Castle's key team members:

Sebastian Wallin: Co-Founder & CTO of Castle.
Contact Info: 1 email address
Johan Brissmyr: Co-Founder & CEO of Castle.
Contact Info: 1 email address

View details of Castle's Founder profiles and Board Members

Castle's employee count trend

Castle has 48 employees as of Mar 26. Here is Castle's employee count trend over the years:

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Top competitors of Castle include ComplyAdvantage, Megvii and Kairos. Here is the list of Top 10 competitors of Castle, ranked by Tracxn score:

Rank	Company Details	Short Description	Total Funding	Investors	Tracxn Score
1st	ComplyAdvantage 2014, London (United Kingdom), Series C	Cloud-based AML solutions	$167M	Ontario Teachers' Pension Plan, Balderton Capital ... & 39 others	77/100
2nd	Megvii 2011, Beijing (China), Series D	Developer of AIoT solutions, including software, hardware, and platform systems	$1.98B	Qiming Venture Partners, Sinovation Ventures ... & 23 others	75/100
3rd	Kairos 2011, Miami (United States), Series A	Provider of AI-powered identity verification, document authentication, and biometric solutions	$19.6M	500 Global, Beyond Capital Markets & 21 others	74/100
4th	Riskified 2013, New York City (United States), Public	AI-based payment fraud prevention solutions for e-commerce solution	$232M	Genesis Partners, Entree Capital & 21 others	73/100
5th	Integral Ad Science 2009, New York City (United States), Acquired	AI powered ad fraud detection software	$80.8M	August Capital, Sapphire Ventures & 11 others	73/100
6th	Quantexa 2016, London (United Kingdom), Series F	AI powered data and decision intelligence solutions	$546M	GIC, Ontario Teachers' Pension Plan & 14 others	72/100
7th	VIDA 2018, Jakarta (Indonesia), Series A	Provider of secure identity management and authentication solutions provider	$47.7M	Jungle Ventures, Hedosophia & 9 others	72/100
8th	Mantra Softech 2006, Ahmedabad (India), Series A	Biometrics-based security and surveillance solutions	$14.2M	India SME Investments, Motilal Oswal & 2 others	72/100
9th	Evrotrust 2015, Sofia (Bulgaria), Series B	AI based identity verification and e-Signing solution provider	$13.8M	3TS Capital Partners, BDB & 5 others	71/100
10th	Yoti 2014, London (United Kingdom), Series B	Provider of digital identity verification, age verification, and authentication solutions	$210M	Lloyds Banking Group, HSBC & 11 others	71/100
59th	Castle 2015, San Francisco (United States), Series A	Provider of infrastructure to detect and prevent bots, abuse, and fraud	$13.7M	F-Prime Capital, FCVC & 16 others	58/100