American International Group Inc (AIG) is slightly overvalued and Berkshire Hathaway Inc (BRK-A) is slightly undervalued.
Against our estimates of intrinsic value, BRK-A trades at the wider discount: a margin of safety of +11%, against -9% for AIG.
Values as of the 22 Sept 2026 close.
Book value at 0.79x, the multiple a 7.2% return on equity justifies, blended with earnings, values the shares at $68.76; the price of $75.18 is 9% above that value.
Leak Score 60/100 on 8 of 12 signals
Book value at 1.64x, the multiple a 12.1% return on equity justifies, blended with earnings, values the shares at $845738.46; the price of $755649.12 is 11% below that value.
Leak Score 55/100 on 10 of 12 signals
| Metric | AIG | BRK-A |
|---|---|---|
| Verdict | Slightly overvalued | Slightly undervalued |
| Price | $75.18 | $755649.12 |
| Intrinsic value | $68.76 | $845738.46 |
| Margin of safety | -9% | +11% |
| Leak Score | 60/100 (8/12) | 55/100 (10/12) |
| Market cap | $39.3B | $970.4B |
| Revenue growth, 5 years | -9.3% | 8.6% |
| Operating margin | 16.9% | 16.3% |
| Net margin | 11.1% | 22.3% |
| Return on equity | 7.2% | 12.1% |
| Debt to equity | 0.22 | 0.17 |
| P/E | 13.8x | 12.7x |
| Forward P/E | 8.5x | 22.7x |
| P/B | 1.0x | 1.4x |
| Dividend yield | 2.6% | — |