share repurchases, share split, dividend increase, dividend reduction, seasoned issue, restatement. actually, you can find many factors that have an impact on stock price.

I am not high-man. Share repurchases are usually greeted by the market. There is empirical evidence that stocks experience postive cumulative abnormal return in years subsequent to repurchase annoncements. This is usually true for stock splits and dividend increases as well. In contrast, dividend reductions, seasoned issues, and restatement usually casue decline of stock prices. Other factors, such as new list in Exchange, may also influence stock prices.