Intuitive Surgical Inc (ISRG) is overvalued and West Pharmaceutical Services Inc (WST) is overvalued.
Both trade above our estimate of their intrinsic value. ISRG is the closer of the two: -130%, against -256% for WST.
Values as of the 22 Sept 2026 close.
Discounting its cash flows at 11.7% (average of 3 methods) values the shares at $175.09; the price of $402.09 is 130% above that value, and 69% of that value comes from beyond year five.
Leak Score 47/100 on 8 of 12 signals
Discounting its cash flows at 10.4% (average of 3 methods) values the shares at $104.26; the price of $371.09 is 256% above that value, and 71% of that value comes from beyond year five.
Leak Score 61/100 on 10 of 12 signals
| Metric | ISRG | WST |
|---|---|---|
| Verdict | Overvalued | Overvalued |
| Price | $402.09 | $371.09 |
| Intrinsic value | $175.09 | $104.26 |
| Margin of safety | -130% | -256% |
| Leak Score | 47/100 (8/12) | 61/100 (10/12) |
| Market cap | $142.0B | $26.1B |
| Revenue growth, 5 years | 18.2% | 7.4% |
| Operating margin | 31.3% | 22.0% |
| Net margin | 28.4% | 17.0% |
| Return on equity | 17.4% | 19.1% |
| Debt to equity | 0.00 | 0.11 |
| P/E | 46.1x | 47.4x |
| Forward P/E | 33.3x | 37.1x |
| P/B | 7.8x | 8.7x |
| Dividend yield | — | 0.2% |