© 2019 Elsevier Inc.This paper investigates the impacts of both the portfolio rebalancing and signalling channel effects associated with US unconventional monetary policy on the dynamic correlation between the stock and bond markets at different levels of stock-bond market correlation distributions. The empirical results reveal that the portfolio rebalancing channel has a strong and predominantly negative effect on the dynamic stock-bond market correlations. In contrast, the signalling channel positively affects the dynamic stock-bond market correlations. The results also provide evidence of an asymmetric effect at the lower quantiles. These findings hence provide valuable information for policymakers, traders and portfolio managers.