These are two dominant companies with long runways and powerful flywheels.

Investors searching for long-duration compounders don't need to overcomplicate things. One approach is to look for market-leading, platform-like business models with recurring economics and management teams investing for the next era of growth. Two standouts fit that bill today: minimally invasive robotic surgery specialist Intuitive Surgical ( ISRG 1.22% ) and cloud-computing and online retailer juggernaut Amazon.com ( AMZN 3.12% ) .

Intuitive's latest quarterly update reinforced the strength of its model, while Amazon's second‑quarter numbers highlighted a business that keeps scaling across multiple profit engines. Neither is cheap, but the durability of their growth stories makes them worthy buy

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