Mastec Inc (MTZ) is slightly undervalued and Sterling Infrastructure Inc (STRL) is overvalued.
Against our estimates of intrinsic value, MTZ trades at the wider discount: a margin of safety of +8%, against -92% for STRL.
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 12.8% (average of 3 methods) values the shares at $269.07; the price of $516.57 is 92% above that value, and 65% of that value comes from beyond year five.
Leak Score 59/100 on 3 of 12 signals
| Metric | MTZ | STRL |
|---|---|---|
| Verdict | Slightly undervalued | Overvalued |
| Price | $221.69 | $516.57 |
| Intrinsic value | $240.05 | $269.07 |
| Margin of safety | +8% | -92% |
| Leak Score | 41/100 (9/12) | 59/100 (3/12) |
| Market cap | $17.8B | $15.8B |
| Revenue growth, 5 years | 17.7% | 11.8% |
| Operating margin | 5.2% | 18.3% |
| Net margin | 3.1% | 12.6% |
| Return on equity | 15.4% | 38.5% |
| Debt to equity | 0.93 | 0.25 |
| P/E | 35.3x | 37.2x |
| Forward P/E | 17.6x | 20.4x |
| P/B | 5.0x | 11.7x |