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Deep Dives

Deep Dive: Intuitive Surgical ($ISRG) - The 320-Bagger's Second Act? (Part 2)

From the Prototype to the Price Tag

René Sellmann's avatar
René Sellmann
Sep 22, 2026
∙ Paid

Part one ended with a question I couldn’t answer yet. Eight reasons to own this business, stress-tested one by one, and a stock down roughly 40% from its high with two credible competitors finally selling robots in the United States.

Was the market repricing a temporary slowdown, or correctly recognizing that the monopoly years are over?

Answering that required going deeper into the underlying engine itself, so part two starts in 1995 with a prototype named after Leonardo da Vinci and ends with a valuation model tying everything else together.

A few things surprised me along the way too. The most consequential product in Intuitive’s history probably isn’t da Vinci 5, and the most consequential decision wasn’t a product at all.

The metric I worry about most has declined in four of the last five years, and it happens to be the one thing management’s long-term pay doesn’t depend on.

Here’s what part two covers (another 10,000-word analysis):

  • Business History

    • The DARPA-funded battlefield research that became a business

    • Lenny, Leonardo, Mona, and a $314.5 million IPO before FDA clearance

    • The patent war that ended in a merger, and why I call it the most important decision in company history

    • Five generations of the same idea, and which machine I’d argue mattered most

    • The ten-year gap that explains today’s upgrade cycle

  • How Intuitive turned third-party staplers into a billion-dollar business

  • The key KPIs to track, and the flywheel connecting them

    • Plus: The one metric you have to calculate yourself, because Intuitive won’t hand it to you

  • Whether 40% operating margins are a feature of the industry or of a monopoly inside it

  • The Getty test: what’s certain about 2046 and what isn’t

  • China, where domestic makers took half of 2025 procurement

  • Dave Rosa’s thirty-year path to CEO

  • What management is paid to deliver, and the gap I spotted in the incentive plan

  • Insider ownership

  • Identifying key growth drivers and assigning a revenue growth contribution range to each

  • Where margins settle, and why management has capped its own upside on purpose

  • Stock-based compensation, and what free cash flow looks like after it

  • Base rates from Mauboussin, anchoring the inside view to the outside view

  • My full valuation model, with a download link so you can change my assumptions

  • Closing thoughts

One note before you start: If you haven’t read part one, the eight pillars of the hypothesis and the falsification tests attached to each can be found there (linked below), and I refer back to them throughout.

Part two works on its own, though you’ll get more out of it with part one in mind.

Read part 1 here:

Deep Dives

Deep Dive: Intuitive Surgical ($ISRG) – The World’s Best Medtech Business on Sale?

René Sellmann
·
Sep 17
Deep Dive: Intuitive Surgical ($ISRG) – The World’s Best Medtech Business on Sale?

Before robots, surgeons fought their own instruments.

Read full story

The full analysis starts here!

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