Ask HN: BP is up 7% in London today, but only 1% on NYSE. Why?
http://www.google.com/finance?q=LON:BP
http://www.google.com/finance?q=bp
The pound is up 1%, which explains part of it, but doesn't come close to explaining the entire difference.
The pound is up 1%, which explains part of it, but doesn't come close to explaining the entire difference.
The LHS represent the market cap of BP at the LSE, the RHS the market of BP at the NYSE. Both sides should be approximately equal because 40% of BP shares are listed in London and 39% in New York.
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.