How Do Company Stocks Perform After Major Data Breach?

A new study shows that companies who have been affected by a data breach underperformed the NASDAQ (in a three-year cycle) by 42%. Need experts to comment on whether that seems like an accurate number, or is the post-data breach stock price issue better or worse for investors, and why? Just how bad is a data breach on company stocks, and why? How long does it take for a stock price to recover? Is there any way at all investors can
insulate themselves from owning shares in a company at higher risk for data breaches? All comments welcome. Requirements: Data breach experts, stock market experts, financial advisors and money managers, analysts, investors.