This paper examines the effects of Chi-X, a pan-European multilateral trading facility, on intraday liquidity co-movements within European equity markets. Chi-X enables simultaneous trading of all European equities on a single trading platform. Further, it induces an increase in multi-market trading between Chi-X and the home exchange, connecting individual markets in a single network. Greater market consolidation combined with an increase in multi-market trading should induce stronger network-wide liquidity co-movements. Consistent with our predictions, we find that Europe-wide liquidity co-movements increase after the Chi-X entry. The increase is stronger in down markets and for stocks with more intense trading on Chi-X
