Reconstruction and effect on share price
A listed company facing reconstruction (divestment, demerger, MBO etc) will have informed the stock market in advance and the share price would have been adjusted accordingly then. As long as the plan is implemented effectively there should be no further major changes to the share price.
The stock market does not like uncertainties, so as long as the company keeps everybody informed with good quality information and its future intentions, the share price can be protected to some extent.
All reconstructions need to be carefully planned and the impact on the future performance, staff moral and share price need to be considered.