Insights

Requirements Leadership Target 3SL as a potential Cradle expansion and modernization partner by highlighting advanced requirements management and systems engineering capabilities to support complex aerospace, defence, space, automotive and nuclear programs.

Integrated Tooling Offer integration and toolchain optimization services to complement Cradle with other software development tools, focusing on seamless data flow and traceability across multi-domain projects.

SME Focus Position consulting and training offerings to scale internal capabilities, enabling 3SL to upskill teams for large-scale requirements engineering programs and efficient tool adoption.

Revenue Upsell Present value-based services and maintenance packages that align with a 1M–10M revenue profile, emphasizing predictable cost of ownership, support SLAs, and continued software updates.

Security & Compliance Emphasize compliance, security hardening, and data governance features relevant to regulated sectors (aerospace, defence, nuclear) to address risk management needs and differentiate from competitors.

3SL Tech Stack

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

  • Hotjar
    Analytics
  • MySQL
    Database
  • Cart Functionality
    E-commerce
  • Yoast SEO
    Search Engines
  • Cloudflare Bot Management
    Security
  • reCAPTCHA
    Security
  • Google Tag Manager
    Tag Management
  • MediaElement.js
    Video Players

3SL's Email Address Formats

3SL uses at least 1 format(s):
3SL Email FormatsExamplePercentage
First.Last@threesl.comJohn.Doe@threesl.com
94%
Last@threesl.comDoe@threesl.com
6%

Frequently Asked Questions

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 7372 - Prepackaged Software NAICS code is 5112 - Software Publishers.

How many employees does 3SL have currently?

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As of July 2026, 3SL has approximately 25 employees across 2 continents, including EuropeNorth America. 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 HotjarMySQLCart FunctionalityYoast SEOCloudflare Bot ManagementreCAPTCHAGoogle 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 logo

3SL

Software DevelopmentEngland, United Kingdom11-50 Employees

3SL is a software development company based in Barrow-in-Furness, England. It offers Cradle, a platform for requirements management and systems engineering, together with training and consultancy to support implementation and ongoing use.

The company has broad experience in integrating software tools and in defining, deploying, and managing requirements management and systems engineering services. Its client base includes organizations in aerospace, defence, space, automotive, and nuclear sectors.

Section iconCompany Overview

Phone number
SIC Code
7372 - Prepackaged Software
Stock Symbol
3SLL.L
NAICS Code
5112 - Software Publishers
Founded
1987
Employees
11-50

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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