Mastec Inc (MTZ) is slightly undervalued and Quanta Services Inc (PWR) is overvalued.
Against our estimates of intrinsic value, MTZ trades at the wider discount: a margin of safety of +8%, against -210% for PWR.
Values as of the 22 Sept 2026 close.
Discounting its cash flows at 12.4% (average of 3 methods) values the shares at $240.05; the price of $221.69 is 8% below that value, and 67% of that value comes from beyond year five.
Leak Score 41/100 on 9 of 12 signals
Discounting its cash flows at 10.6% (average of 3 methods) values the shares at $207.13; the price of $642.63 is 210% above that value, and 72% of that value comes from beyond year five.
Leak Score 55/100 on 10 of 12 signals
| Metric | MTZ | PWR |
|---|---|---|
| Verdict | Slightly undervalued | Overvalued |
| Price | $221.69 | $642.63 |
| Intrinsic value | $240.05 | $207.13 |
| Margin of safety | +8% | -210% |
| Leak Score | 41/100 (9/12) | 55/100 (10/12) |
| Market cap | $17.8B | $96.6B |
| Revenue growth, 5 years | 17.7% | 20.5% |
| Operating margin | 5.2% | 6.4% |
| Net margin | 3.1% | 4.0% |
| Return on equity | 15.4% | 15.2% |
| Debt to equity | 0.93 | 0.69 |
| P/E | 35.3x | 73.6x |
| Forward P/E | 17.6x | 32.7x |
| P/B | 5.0x | 10.0x |
| Dividend yield | — | 0.1% |