21six

21six.com

marketing & advertising

21six.com

Southampton, England, United Kingdom

11-50 employees

528000 revenue

LinkedIn Profile

About 21six

marketing, design, digital marketing, website, medical writing, healthcare, healthcare marketing, healthcare agency, advertising services, seo & analytics, customer engagement, human connection, digital solutions, brand loyalty, brand performance, brand growth, advertising & marketing, mutual success philosophy, brand assets, b2b

21six's Tech Stack

AI/ML

Marketing

Hubspot

23 technologies detected · 2 decision makers · Emails available

Sales Outreach Angle

HubSpot users typically run inbound-led sales motions. Products that integrate with HubSpot (email automation, CRM enrichment, ABM platforms) are natural fits.

21six's Position in the StackWho Database

• 21six is 1 of 80,546 marketing & advertising companies tracked in StackWho.
• 80,503 marketing & advertising companies in our database have verified decision-maker emails (100% of the cohort).
• 47,721 companies in England are in the StackWho database.
• 21,907 marketing & advertising companies are in the 11-50 employee range (same size as 21six).

Technology detection from public web signals. Decision-maker contacts compiled from LinkedIn public profiles, company filings, and verified outbound testing. Methodology & sources · Updated August 2026.

Frequently Asked Questions

What technology does 21six use?

21six uses Amazon SES, ElasticEmail, Gmail, Google Apps, DigitalOcean, Microsoft Office 365, and 17 more technologies. This data is sourced from StackWho's technology detection engine.

How do I contact the decision makers at 21six?

StackWho has verified email addresses for 2 decision makers at 21six. Pro members can access direct emails for the CEO, CTO, VP of Engineering, and other key contacts. Use StackWho to reach 21six directly for sales, recruiting, or partnerships.

What industry is 21six in?

21six operates in the marketing & advertising industry, headquartered in Southampton, England, United Kingdom. StackWho tracks technology stacks and decision maker contacts for companies across all industries.

Can I export 21six's contact data?

Yes. StackWho Pro members can export decision maker contact data for 21six and similar companies to CSV. Use the export feature to build targeted prospect lists segmented by technology stack, industry, or location.