Insights

Strategic Focus Target sectors and capability: 3SL specializes in requirements management and systems engineering with deep domain experience in aerospace, defence, space, automotive, and nuclear. This presents a growth path through selling Cradle enhancements, integration capabilities, and training services to large engineering programs and compliance-driven projects.

Controls and Compliance Leverage compliance and security mindset: The tech stack includes security and data privacy elements (HSTS, Cloudflare Bot Management, Piwik PRO). Position Cradle as a compliant, auditable tool for regulated industries, emphasizing traceability, verification workflows, and secure deployment models to win contracts with defense, space, and nuclear clients.

Financial Opportunity Mid-market revenue range and service mix: With estimated annual revenue of $1M-$10M and a focus on training and consultancy alongside software tooling, there is potential to upsell premium support, long‑term maintenance contracts, and extended training programs to existing clients and through partner channels.

Expansion Potential Scale via integrations and toolchain synergies: 3SL’s strength in tool integration and end-to-end management of requirements suggests opportunities to partner with large system integrators and platforms, offering Cradle integration with other engineering tools to win larger, multi-project opportunities.

Competitive Positioning Distinctive niche in high-stakes industries: With a focused track record in aerospace, defence, space, automotive, and nuclear, emphasize domain expertise, regulatory compliance, and bespoke training to differentiate from generic competitors and target customers seeking specialized, trusted partners.

Similar companies to 3SL

3SL Tech Stack

3SL uses 8 technology products and services including Hotjar, Matomo, WordPress, and more. Explore 3SL's tech stack below.

  • Analytics
  • Analytics
  • Content Management System
  • Yoast SEO
    Search Engines
  • Cloudflare Bot Management
    Security
  • HSTS
    Security
  • MediaElement.js
    Video Players
  • Web Analytics

3SL's Email Address Formats

3SL uses at least 2 email formats:
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?

Minus sign iconPlus sign icon
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?

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

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

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

How much revenue does 3SL generate?

Minus sign iconPlus sign icon
As of August 2026, 3SL's annual revenue is estimated to be $1M - $10M.

What is 3SL's SIC code and NAICS code?

Minus sign iconPlus sign icon
3SL's SIC code is 7372 - Prepackaged Software and NAICS code is 5112 - Software Publishers.

How many employees does 3SL have currently?

Minus sign iconPlus sign icon
As of August 2026, 3SL has approximately 25 employees across 2 continents, including Europe and North America. Key team members include Financial Controller: J. L., Financial Controller: J. M. and Office Manager: M. V. Explore 3SL's employee directory with LeadIQ.

What industry does 3SL belong to?

Minus sign iconPlus sign icon
3SL operates in the Software Development industry.

What technology does 3SL use?

Minus sign iconPlus sign icon
3SL's tech stack includes Hotjar, Matomo, WordPress, Yoast SEO, Cloudflare Bot Management, HSTS, MediaElement.js and Piwik PRO Core.

What is 3SL's email format?

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

When was 3SL founded?

Minus sign iconPlus sign icon
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

Ready to create more pipeline?

Get a demo and discover why thousands of SDR and Sales teams trust
LeadIQ to help them build pipeline confidently.

© LeadIQ, Inc. All rights reserved.