Question: Does a rights issue of shares have an effect on the share price when (a)it is announced and(b)they trade ex-rt 

Answer: No direct on the share price, but they will have to show up on an income statement as diluted EPS, which takes into account the effect of all rights and option conversion into common stock.  Usually the rights will trade seperately, just like options.
This question from the Yahoo Q&A forum is categorized in the topic: Health