Norbert Lou - Punch Card Management Portfolio
| Period Date | Mar 31, 2025 | |
| Filing Date | May 15, 2025 | |
| Total Stocks | 4 | |
| Portfolio Value | $216.63M |
Punch Card Management Strategy Analysis
Investment Strategy Metrics
Key metrics revealing investment style, risk management, and performance characteristics
| Metric | Value | Category | Description |
|---|---|---|---|
| Holding Period | 1.8 years | Style | Average duration positions are maintained |
| Position Count | 6 | Style | Number of active positions in portfolio |
| Position Size | 23.3% | Risk | Typical allocation per position |
| Win Rate | 56.8% | Performance | Percentage of profitable positions |
| Average Return | 63.8% | Performance | Mean return across positions |
| Sharpe Ratio | 0.17 | Performance | Return per unit of risk taken |
Investment Case Study: BERKSHIRE HATHAWAY INC DEL (BRK-A)
12/31/2014 - 7/6/2025
Performance Metrics
Total Return: -79.02%
Holding Period: 3840 days
Max Position Size: $115,774,032.00
Position Weight: 52.63%
Key Events
12/31/2014: ENTRY(373.00 shares) @ $226.00
3/31/2020: DECREASE(-6.00 shares) @ $272.00
6/30/2020: DECREASE(-18.00 shares) @ $267.30
3/31/2025: DECREASE(-204.00 shares) @ $798,441.60
Investment Thesis
Entry Context: Initial position established based on fundamental analysis
Sector Conditions: Favorable market conditions in the sector
Risk Factors:
- Market volatility
- Sector-specific risks
Key Learnings
- Position sizing is critical for portfolio management
- Important to monitor sector exposure