AMPHENOL CORP /DE/ vs United Microelectronics Corporation, two Semiconductors stocks. A side-by-side on valuation, growth, margins, returns, and what each price is betting.
One number separates the pair: free-cash yield, 2.2% at Amphenol against 0.05% at UMC, a connector compounder that turns earnings into cash next to a foundry whose earnings are currently an accounting rumor. UMC's 213 times multiple is a trough artifact, trailing-edge chip pricing compressing the denominator, not a growth premium; its 32.3% gross margin against Amphenol's 36.8% shows the commodity position even in good light. Amphenol's 47 times is a real premium on real returns, 31.7% on equity, leveraged 1.18 to one. The comparison is almost unfair, which is itself the finding: sector tags put these side by side, economics do not.
Comparison updated 2026-07-10.
| Metric | APH | UMC |
|---|---|---|
| Price | $163.47 | $25.58 |
| Market cap | $210.8B | $311.4B |
| Sector | Semiconductors | Semiconductors |
| Stage | Growth | Growth |
| P/E | 47.0 | 213.2 |
| P/B | 14.97 | 27.92 |
| P/S | 8.14 | 43.56 |
| EV/EBITDA | 28.4 | 195.8 |
| Revenue growth | +54.4% | +8.9% |
| Gross margin | 36.8% | 32.3% |
| Operating margin | 24.0% | 22.0% |
| Net margin | 17.2% | 20.8% |
| Return on equity | 31.7% | 13.3% |
| Return on assets | 10.6% | 8.7% |
| Return on invested capital | 12.5% | 12.0% |
| FCF yield | 2.2% | 0.1% |
| Dividend yield | 0.5% | — |
| Debt / equity | 1.18 | 0.00 |
| Current ratio | 1.71 | 2.45 |
| Altman Z (solvency) | 5.80 | 6.96 |
| Piotroski F (quality) | 6 / 9 | 6 / 9 |
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The stronger value is highlighted per metric where one is strictly better on that single number; it is not an overall verdict on either company. For informational and research purposes only. Not investment advice. Not a recommendation to buy, sell, or hold any security. boothcheck is not a registered investment adviser. Past performance does not guarantee future results.