Nikkei Top 3 Weight
28.4%
Fast Retailing, TEL, Advantest
TOPIX Top 3 Weight
8.1%
Toyota, MUFG, TEL
Index Divergence
14.20 pts
Price vs Cap-Weighted gap
KOSPI Tech Beta
High Sensitivity
Corr: 0.82 with Chip Exports
Constituent Weighting Skew (Nikkei 225 vs TOPIX)
Comparing Price-Weighted (Nikkei) vs Market-Cap Weighted (TOPIX) percentage allocation
Multi-Index Tech Correlation Matrix (Nikkei vs KOSPI vs TOPIX)
Simulating 30-day index return trajectories during tech earnings cycle shocks
REASONING PROOF & MODEL DYNAMICS
Why Nikkei 225 Tracks KOSPI While TOPIX Reflects Domestic Value
The Nikkei 225 uses a price-weighted index formula where single high-priced tech stocks (like Tokyo Electron and Advantest) command massive effective weights (~28.4% in top 3). Consequently, global semiconductor demand shocks cause Nikkei 225 to move in lockstep with Korea's semiconductor-heavy KOSPI index. Conversely, TOPIX uses market-capitalization weighting (~8.1% top 3 concentration), rendering it resilient to single-stock price swings and tightly aligned with broad Japanese domestic corporate earnings and dip-buying flows.