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.

Similar companies to 3SL

3SL Tech Stack

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

Matomo
Analytics
Cart Functionality
E-commerce
Twemoji
Font Scripts
Yoast SEO
Search Engines
Cloudflare Bot Management
Security
Bootstrap
UI Frameworks
MediaElement.js
Video Players
Piwik PRO Core
Web Analytics

Media & News

3SL's Email Address Formats

3SL uses at least 1 format(s):

3SL Email Formats	Example	Percentage
First.Last@threesl.com	John.Doe@threesl.com	94%
Last@threesl.com	Doe@threesl.com	6%

Frequently Asked Questions

Where is 3SL's headquarters located?

3SL's main headquarters is located at Howard Street Barrow in Furness, England United Kingdom. The company has employees across 2 continents, including EuropeNorth America.

What is 3SL's phone number?

You can contact 3SL's main corporate office by phone at

+1-256-971-****

. 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?

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

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

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

What is 3SL's NAICS code?

3SL's NAICS code is 5112 - Software Publishers.

How many employees does 3SL have currently?

As of May 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?

3SL operates in the Software Development industry.

What technology does 3SL use?

3SL's tech stack includes MatomoCart FunctionalityTwemojiYoast SEOCloudflare Bot ManagementBootstrapMediaElement.jsPiwik PRO Core.

What is 3SL's email format?

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

When was 3SL founded?

3SL was founded in 1987.

3SL

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

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

Q: How many employees does 3SL have currently?

3SL has approximately 25 employees.

Q: What technology does 3SL use?

3SL's tech stack includes Wow, Matomo, Google Maps, Twemoji, Twitter.

Q: What is 3SL's NAICS code?

3SL's NAICS code is 5112 (Software Publishers).

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.