Sonoco Products Co (SON) is undervalued and Smurfit WestRock plc (SW) is overvalued.
Against our estimates of intrinsic value, SON trades at the wider discount: a margin of safety of +48%, against -27% for SW.
Values as of the 22 Sept 2026 close.
Discounting its cash flows at 6.5% (average of 3 methods) values the shares at $97.75; the price of $50.69 is 48% below that value, and 85% of that value comes from beyond year five.
Leak Score 86/100 on 3 of 12 signals
Discounting its cash flows at 8.1% (average of 3 methods) values the shares at $36.68; the price of $46.45 is 27% above that value, and 80% of that value comes from beyond year five.
Leak Score 0/100 on 2 of 12 signals
| Metric | SON | SW |
|---|---|---|
| Verdict | Undervalued | Overvalued |
| Price | $50.69 | $46.45 |
| Intrinsic value | $97.75 | $36.68 |
| Margin of safety | +48% | -27% |
| Leak Score | 86/100 (3/12) | 0/100 (2/12) |
| Market cap | $5.0B | $24.3B |
| Revenue growth, 5 years | 7.5% | 26.2% |
| Operating margin | 10.0% | 5.8% |
| Net margin | 8.7% | 1.6% |
| Return on equity | 18.9% | 2.7% |
| Debt to equity | 1.33 | 0.79 |
| P/E | 7.8x | 49.4x |
| Forward P/E | 8.0x | 13.3x |
| P/B | 1.4x | 1.4x |
| Dividend yield | 4.2% | 4.0% |