When was StackOne founded?

StackOne was founded in 2023 and raised its 1st funding round within a year of its incorporation.

Where is StackOne located?

StackOne is headquartered in London, United Kingdom. It is registered at CAMBURGH HOUSE,27 NEW DOVER ROAD,CANTERBURY,KENT,UNITED KINGDOM,CT1 3DN.

Who is the current CEO of StackOne?

Romain Sestier of StackOne. They have also founded 1 company.

Which legal entities is StackOne associated with?

StackOne is associated with STACKONE TECHNOLOGIES LIMITED.

How many employees does StackOne have?

As of Apr 30, 2026, the latest employee count at StackOne is 55.

Is StackOne a funded company?

StackOne is a funded company, having raised a total of $24.4M across 3 funding rounds to date. The company's 1st funding round was a $***** Seed round, raised on Mar 24, 2023.

How much is StackOne worth?

The latest valuation of StackOne is £***** as of Jul 08, 2025.

When was the latest funding round of StackOne?

StackOne's latest funding was a $***** Series A round on Apr 11, 2025, with participation from 5 investors.

Where does StackOne rank among its competitors?

StackOne ranks 8th amongst 118 active competitors, of which 23 are funded. It stands 8th in terms of total funding among its competitors. The most recent competitor to raise funding was Wallarm, which secured $55M in Jul, 2025.

Who are the top competitors of StackOne?

StackOne's top competitors include F5 Networks, A10 Networks and Traceable Security. Among them, Wallarm secured the most recent funding round in July, 2025.

StackOne - 2026 Company Profile, Team, Funding & Competitors

StackOne is a series A company based in London (United Kingdom), founded in 2023 by Guillaume Lebedel and Romain Sestier. It operates as a Provider of integration infrastructure for connecting AI agents to applications. StackOne has raised $24.4M in funding from Google Ventures and Episode 1 Ventures, with a current valuation of £*****. The company has 118 active competitors, including 23 funded and 10 that have exited. Its top competitors include companies like F5 Networks, A10 Networks and Traceable Security.

Company Details

Provider of integration infrastructure for connecting AI agents to applications. It offers tools for connecting, optimizing, and securing AI agents' interactions with external systems. The infrastructure supports connecting to various APIs and protocols. It optimizes context, token usage, and execution reliability. The platform secures interactions through permissions, audit trails, and prompt injection protection.

Website: www.stackone.com/
Social
Registered Address: CAMBURGH HOUSE,27 NEW DOVER ROAD,CANTERBURY,KENT,UNITED KINGDOM,CT1 3DN

Key Metrics

Founded Year

2023

Location

London, United Kingdom

Stage

Series A

Total Funding

$24.4M in 3 rounds

Latest Funding Round

Series A, Apr 11, 2025, $*****

Post Money Valuation

£***** as on Jul 08, 2025

Investors

Google Ventures & 21 more

Ranked

8^th among 118 active competitors

Employee Count

55 as on Apr 30, 2026

Similar Companies

Traceable Security & 106 more

View StackOne's full profile

StackOne is associated with 1 legal entity given below:

Legal Entity Name	Date of Incorporation	Revenue	Latest Employee Count	Documents
STACKONE TECHNOLOGIES LIMITED CIN: 14684360 , United Kingdom, Active	Feb 22, 2023	-	13 (As on Dec 31, 2024)

StackOne has raised a total funding of $24.4M over 3 rounds. Its first funding round was on Mar 24, 2023. Its latest funding round was a Series A round on Apr 11, 2025 for $*****. 5 investors participated in its latest round. StackOne has 16 institutional investors and 6 angel investors.

Here is the list of recent funding rounds of StackOne:

Date of Funding	Funding Amount	Round Name	Post-Money Valuation	Revenue Multiple	Lead Investors	Other Investors
Apr 11, 2025	7001818	Series A	7055897	6509439	8838063	5922532
Nov 29, 2023	5460955	Seed	2188705	5097745	9956308	Playfair Capital & 6 more
Mar 24, 2023	2547929	Seed	4787823	4874361	2280523	6643241

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View details of StackOne's funding rounds and investors

The founders of StackOne are Guillaume Lebedel and Romain Sestier. Romain Sestier is the CEO of StackOne.

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

Guillaume Lebedel: Co-Founder of StackOne.
Contact Info: 1 email address
Romain Sestier: Co-Founder & CEO of StackOne.
Contact Info: 1 email address

View details of StackOne's Founder profiles and Board Members

StackOne's employee count trend

StackOne has 55 employees as of Apr 26. Here is StackOne's employee count trend over the years:

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Top competitors of StackOne include F5 Networks, A10 Networks and Traceable Security. Here is the list of Top 10 competitors of StackOne, ranked by Tracxn score:

Rank	Company Details	Short Description	Total Funding	Investors	Tracxn Score
1st	F5 Networks 1996, Seattle (United States), Public	Provider of application delivery and security solutions for various platforms	-	Elliott Management, Herald Investment Management ... & 7 others	75/100
2nd	A10 Networks 2004, United States, Public	Provider of application delivery, security, and centralized management and analytics solutions	$118M	Mitsui, Summit Partners & 9 others	69/100
3rd	Traceable Security 2018, San Francisco (United States), Series B	Cloud based API security solution	$110M	IVP, Citi Ventures & 7 others	68/100
4th	Salt Security 2016, Palo Alto (United States), Series D	AI based API security software	$281M	Sequoia Capital, Tenaya Capital & 18 others	67/100
5th	Cequence 2014, Sunnyvale (United States), Series C	Cloud based platform offering API security solutions	$100M	Shasta Ventures, Prosperity7 Ventures & 15 others	64/100
6th	Mayhem 2012, Pittsburgh (United States), Acquired	Automated code and API security testing tool	$37.9M	New Enterprise Associates, Koch Disruptive Technologies ... Read more	61/100
7th	Indusface 2012, Vadodara (India), Series A	Provider of AI-powered application security platform protecting web, mobile, and APIs	$5.05M	Tata Capital Growth Fund, Tata Capital & 1 others	60/100
8th	StackOne 2023, London (United Kingdom), Series A	Provider of integration infrastructure for connecting AI agents to applications	$24.4M	Sequoia Capital, Workday Ventures & 20 others	60/100
9th	Bright Security 2018, San Rafael (United States), Series A	Platform offering security testing software	$25.7M	Evolution Equity Partners, DNX Ventures & 8 others	59/100
10th	Wallarm 2013, San Francisco (United States), Series C	API security platform delivering complete protection against attacks and abuse	$75.1M	Toba Capital, Runa Capital & 8 others	58/100