Royal Mail chief executive Moya Greene opened trading at the London Stock Exchange this morning, accompanied by Business Minister Michael Fallon and Treasury Chief Secretary Danny Alexander.
While shares have been trading informally since Friday when conditional trading began, today is the first day of unconditional dealing in Royal Mail stock.
Shares gained another 15p or 3%, making then almost 50% more valuable than the government's price tag last week.
Shares in Royal Mail soared again this morning as trading started making them almost 50% more valuable than the government's price tag.
Within five minutes of Royal Mail being officially listed on the London Stock Exchange over a million shares had been traded.