One of the foremost recognized studies conducted on the impact of a catastrophe on the stock value of an organization was completed by Dr Rory Knight and Dr Deborah Pretty (1996, Templeton College, University of Oxford - commissioned by the Sedgewick Group). This study undertook a detailed analysis of the stock price (post impact) of organizations that had experienced catastrophes. The study identified organizations that recovered and even exceeded pre-catastrophe stock price, ("Recoverers"), and those that did not recover on stock price, ("Non-recoverers"). The average cumulative impact on shareholder value for the recoverers was 5% plus on their original stock value. So the net impact on shareholder value by this stage was actually positive. The non-recoverers remained more or less unchanged between days 5 and 50 after the catastrophe, but suffered a net negative cumulative impact of almost 15% on their stock price up to one year afterwards.