Vendor due diligence for a global messaging software provider 

Case study overview

STL Partners supported a specialist provider of messaging and security software with a comprehensive vendor due diligence (VDD) assessment ahead of a strategic transaction process. The work gave the company’s board and prospective investors an independent, evidence-based view of its market position, competitive standing and customer relationships across its three product lines: a core messaging platform, an AI-driven security and anti-fraud module, and a communications/monetisation platform. 

The engagement combined -up TAM and SAM modelling across three product lines, an -interview programme with existing and former customers, and detailed competitive benchmarking against both global infrastructure vendors and specialist niche players. STL synthesised the findings into an integrated due diligence report alongside recommendations for value-creation recommendations. 


What was the approach?

STL designed a four-part programme spanning market sizing, competitor analysis, customer insights, financial modelling and strategic recommendations. 

1. Market sizing 

  • STL built bottom-up TAM and SAM models for each of the company’s three product lines, with growth projections to 2030 segmented by operator tier, region and customer type, then translated this market sizing into a serviceable addressable opportunity to benchmark realistic penetration scenarios. 

2. Competitor analysis 

  • STL profiled the full competitive set across each product line, spanning large, diversified infrastructure vendors and smaller, focused specialists, and identified structural whitespace by region and operator tier where competitive intensity was lower. 

3. Customer insights 

  • STL held in-depth interviews with senior IT, network and security leaders — including CISOs, heads of core network and engineering leads — across existing and churned customers, analysing renewal drivers, switching triggers, perceived strengths and improvement priorities by product line, and assessing the channel and stakeholder dynamics shaping adoption of newer, non-core products. 

4. Revenue forecasting 

  • STL ran sensitivity analysis linking scenario outcomes to serviceable market penetration rates and identified the key execution risks and dependencies behind each scenario.

5. Strategic recommendations 

  • STL synthesised the market, competitor and customer findings into a set of prioritised value-creation levers, with recommendations spanning portfolio rebalancing, commercial model modernisation, account management and product differentiation, and developed board-ready messaging to support the company’s equity story. 

Key results from the project

  • Strengthened the company’s investment case by providing an independent, evidence-based assessment of its market opportunity, competitive positioning and growth prospects across all three product lines. 
  • Refined the equity story by translating customer, competitor and market insights into a clear set of strategic recommendations covering product portfolio, go-to-market strategy, commercial model and customer expansion. 
  • Supported the transaction process with a board-ready vendor due diligence report that provided prospective investors with an independent assessment of the business’s market position and long-term growth potential.