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 Apr 30, 2026, the latest employee count at Castle is 51.

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 53rd amongst 2413 active competitors, of which 399 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, Kairos and Integral Ad Science. 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

53^rd among 2413 active competitors

Employee Count

51 as on Apr 30, 2026

Similar Companies

Kairos & 2476 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	-	5 (As on Dec 31, 2022)	-
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	6428282	Series A	2402117	1377198	8446781	1038757
Nov 09, 2016	3616493	Seed	6520239	3488295	6794984	F-Prime Capital & 1 more
Mar 21, 2016	3439891	Seed	7316214	7940570	Y Combinator	5373303

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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 51 employees as of Apr 26. Here is Castle's employee count trend over the years:

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Top competitors of Castle include ComplyAdvantage, Kairos and Integral Ad Science. 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	Index Ventures, Ontario Teachers' Pension Plan ... & 39 others	75/100
2nd	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
3rd	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
4th	Evrotrust 2015, Sofia (Bulgaria), Series B	AI based identity verification and e-Signing solution provider	$13.8M	3TS Capital Partners, BDB & 5 others	72/100
5th	Yoti 2014, London (United Kingdom), Series B	Provider of digital identity verification and age assurance software tools	$210M	HSBC, Nex.D & 11 others	71/100
6th	Clear 2010, New York City (United States), Public	Provider of expedited identity verification services for airport security and more	$135M	T. Rowe Price, United Airlines & 21 others	71/100
7th	iProov 2011, London (United Kingdom), Series B	Platform offering digital identity verification services	$85.1M	Sippchoice, Sumeru Equity Partners & 50 others	70/100
8th	Mantra Softech 2006, Ahmedabad (India), Series A	Biometrics-based security and surveillance solutions	$14.2M	India SME Investments, Motilal Oswal Financial Services ... & 2 others	70/100
9th	Fenergo 2009, Dublin (Ireland), Acquired	Cloud based KYC and AML management software	$181M	Ergo, Insight Partners & 26 others	70/100
10th	EverC 2011, New York (United States), Acquired	AI-enabled transaction monitoring solutions for financial institutions	$48M	Viola Group, Arbor Ventures & 7 others	69/100
53rd	Castle 2015, San Francisco (United States), Series A	Provider of infrastructure to detect and prevent bots, abuse, and fraud	$13.7M	Index Ventures, Rising Tide Fund & 16 others	58/100