The Idea: In 1995, Mark Leonard left an 11-year career as a Canadian venture capitalist with one obsession: a category of software every VC was ignoring. While everyone else chased flashy consumer apps and horizontal SaaS, Leonard noticed something weird about Vertical Market Software - the niche stuff that runs marinas, libraries, dental practices, and oil rigs. High switching costs. Predictable cash flows. Sticky recurring revenue. And almost nobody bidding on them. So he raised $25M, set a 25%+ ROIC hurdle rate, and started buying them up - one tiny $2-4M deal at a time. The plan: never sell, let founders keep running their companies, redeploy every dollar of free cash flow into the next acquisition, and compound for decades. This was the beginning of Constellation Software.

The Execution:

• 1995: Leaves Ventures West with $25M from VCs to start Constellation Software, betting on Vertical Market Software while everyone else chases dot-com mania.
• 2006: Takes Constellation public on the TSX at CAD$17.71/share. The stock will compound at ~30% per year for the next two decades - $10K at IPO becomes ~$2M today.
• 2013: Cracks the "Compounder" framework in his now-cult shareholder letters - never sell, always reinvest, decentralize, give acquired founders full autonomy and skin in the game.
• 2018: Goes silent. Stops writing the letters and cancels quarterly earnings calls so emulators can't copy the playbook. The cult around him only grows.
• 2021: Spins out Topicus.com to chase larger European VMS deals at slightly lower hurdle rates - it goes on to become a multi-billion-dollar company in its own right.
• 2023: Spins out Lumine Group using the same playbook for media and communications software.
• 2026: Steps back from the CSI board at 70+, transitioning to advisor role. Constellation now owns over 1,000 software companies, generates $11.6B in annual revenue, employs 45,000 people across 100+ verticals, and is worth $37B+ - all built one boring acquisition at a time.

The lesson? Mark Leonard built one of the great compounding stories of the modern era by ignoring everything that was hot and obsessing over what was boring. He didn't disrupt anything. He didn't go viral. He never gave a podcast interview. He just bought 1,000 small businesses nobody else wanted, never sold a single one, and let the math do its thing. The most underrated superpower in business isn't vision - it's the patience to compound.