Insights

Niche Market Focus 3SL specializes in requirements management and systems engineering for high-tech sectors such as aerospace, defense, space, automotive, and nuclear, offering targeted solutions for organizations operating in safety-critical and compliance-driven environments.

Small but Specialized With a team of 11-50 employees and an estimated revenue of up to 10 million dollars, 3SL presents an opportunity to provide tailored, scalable solutions that complement their niche expertise and client base.

Growth Potential Positioned within a competitive landscape alongside companies like Jama Software and Inflectra, 3SL may be looking to expand its market share by leveraging its deep industry experience and specialized tools such as Cradle.

Technological Compatibility 3SL’s tech stack includes popular tools and APIs that indicate potential interest in integrations and enhancements—presenting upsell opportunities for innovative software solutions that improve requirements management workflows.

Financial Opportunity Targeting organizations with project budgets and compliance needs in regulated sectors, sales teams can position solutions that enhance requirements traceability and systems engineering efficiencies, aligning with 3SL’s industry focus.

3SL Tech Stack

3SL uses 8 technology products and services including Hotjar, Cart Functionality, Google Fonts API, and more. Explore 3SL's tech stack below.

  • Hotjar
    Analytics
  • Cart Functionality
    E-commerce
  • Google Fonts API
    Font Scripts
  • Yoast SEO
    Search Engines
  • HSTS
    Security
  • X-XSS-Protection
    Security
  • Google Tag Manager
    Tag Management
  • MediaElement.js
    Video Players

Media & News

3SL's Email Address Formats

3SL uses at least 1 format(s):
3SL Email FormatsExamplePercentage
First.Last@threesl.comJohn.Doe@threesl.com
47%
Last@threesl.comDoe@threesl.com
3%
First.Last@threesl.comJohn.Doe@threesl.com
47%
Last@threesl.comDoe@threesl.com
3%

Frequently Asked Questions

Where is 3SL's headquarters located?

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3SL's main headquarters is located at Barrow in Furness, England la14 1nb United Kingdom. The company has employees across 3 continents, including EuropeNorth AmericaAsia.

What is 3SL's phone number?

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You can contact 3SL's main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is 3SL's stock symbol?

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3SL is a publicly traded company; the company's stock symbol is 3SLL.L.

What is 3SL's official website and social media links?

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3SL's official website is threesl.com and has social profiles on LinkedIn.

What is 3SL's SIC code NAICS code?

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3SL's SIC code is 5734 - Computer and Computer Software Stores NAICS code is 5112 - Software Publishers.

How many employees does 3SL have currently?

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As of February 2026, 3SL has approximately 26 employees across 3 continents, including EuropeNorth AmericaAsia. Key team members include Financial Controller: J. L.Financial Controller: J. M.Office Manager: M. V.. Explore 3SL's employee directory with LeadIQ.

What industry does 3SL belong to?

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3SL operates in the Software Development industry.

What technology does 3SL use?

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3SL's tech stack includes HotjarCart FunctionalityGoogle Fonts APIYoast SEOHSTSX-XSS-ProtectionGoogle Tag ManagerMediaElement.js.

What is 3SL's email format?

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3SL's email format typically follows the pattern of First.Last@threesl.com. Find more 3SL email formats with LeadIQ.

When was 3SL founded?

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3SL was founded in 1987.

3SL

Software DevelopmentEngland, United Kingdom11-50 Employees

Developer of the requirements management and systems engineering tool "Cradle" and the provider of related training and consultancy services.

3SL has extensive experience in the integration of software tools and in the definition, deployment and management of requirements management and systems engineering services. We have specific experience in several industry sectors, including aerospace, defence, space, automotive and nuclear.

Section iconCompany Overview

Headquarters
Barrow in Furness, England la14 1nb United Kingdom
Phone number
SIC Code
5734 - Computer and Computer Software Stores
Stock Symbol
3SLL.L
NAICS Code
5112 - Software Publishers
Founded
1987
Employees
11-50

Section iconMedia & News

Section iconFunding & Financials

  • $1M$10M

    3SL's revenue is estimated to be in the range of $1M$10M

Section iconFunding & Financials

  • $1M$10M

    3SL's revenue is estimated to be in the range of $1M$10M

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