The above is an explanation as to why the prices in New York and London are always in sync. But the direct answer to your question is that the rise in the shar

The above is an explanation as to why the prices in New York and London are always in sync. But the direct answer to your question is that the rise in the share price is shown relative to the closing price on the day before. And the LSE closes at 11.30AM EST and NYSE closes at 4.00PM EST.