The All Ordinaries Index is a benchmark of the share prices of more than 300 listed companies in Australia. Woolworths Limited's share price was relatively lower than all ordinary share prices prior to the announcement date. Maybe because most companies were doing well in the stock market. But after the announcement date, Woolworths Limited's share price approached that of all ordinary shares, and both showed a downward trend. Conclusion To summarise, it is clear that Woolworths Limited's full year 2016 results bring a spike in its share price in the last three weeks from the announcement date. But after that, its stock price starts to show a downward trend, although it started to rise slowly after two weeks of the announcement date, it is still very low, but close to all ordinary ones. Therefore, this investigation shows that all available information is displayed on the stock price, but different investors have different opinions on the information, and the stock price will not always follow a clear path