WMH Project Groupe is a 360 event communications agency working with CAC 40 companies. A two-person marketing function, led by Joris Pierrot (Data Marketing & CRM Manager) and Joana Contois (Marketing Project Manager), runs lead generation, account mapping, and CRM for the entire agency.

Before Tamtam, Joana would spend 2-3 hours per account mapping task, several times a week. Each list required a CSV export, re-import for enrichment, another export to HubSpot, and manual deduplication that consumed as much time as building the list itself. Targeting was purely persona-driven: no visibility into job changes, new hires, or relevant events. Salespeople approached prospects cold with zero context.

Their previous tooling only covered France, which made it impossible to map CAC 40 accounts with international subsidiaries. “We managed to do miracles as a team of two,” Joris said. “But we needed something that could match our ambitions.”

• -80% research time. Account mapping collapsed from 2-3 hours to 15-30 minutes per task. “It divides my time by three,” Joana said. “Maybe even better, because I can take the time I used to spend and truly sort through what's useful.”
• 3x qualified leads delivered to sales without adding headcount. Better-prepared salespeople led to higher conversion rates and more regular meetings.
• 50% fewer tools in the stack. Less than a month after signing, a friend at a competing event agency signed too and cut his tools by four.

The freed bandwidth allowed the team to focus on strategic projects: brand launches, CRM improvement, and perfecting their data infrastructure. “The fact that Tamtam freed up bandwidth allows us to focus on other projects,” Joris said. “Brand launches, activity launches, and perfecting our CRM, since a CRM is a living organism that changes every day.”

“The better we prepare our salespeople, the better the accounts respond,” Joris said. “Better conversion rate, more regular meetings, less frustration: it's a virtuous circle, and Tamtam is at the very beginning of this value chain.”

Joana now builds complete account maps directly in Tamtam, filtered by persona, seniority, and location. Subsidiary mapping lets the team expand inside complex enterprise groups: “When we work CAC 40 companies, being able to identify subsidiaries is a monumental time savings.”

The team moved from static persona targeting to dynamic, intent-driven prospecting. They now track job changes, new hires, and event participation: “Signals are things we didn't use at all before,” Joana said. “We've defined criteria that go beyond persona.”

Direct CRM integration eliminated the CSV export cycle. Matching and deduplication happen in-platform, reclaiming the hours that used to go to manual data cleanup. Salespeople no longer approach prospects cold: they have signals, org context, and account intelligence before the first conversation.

The commercial director now uses the platform to monitor key accounts: tracking competitor movements, partner activity, and new leads, redistributing opportunities across the team.