ZURICH, June 24 (Reuters) - Shares in Syngenta were seen rising 5-10 percent on Tuesday following a Bloomberg report saying Monsanto had considered buying the Swiss agrochemicals company, traders said. A spokesman for Syngenta was not immediately available for comment. (Reporting by Alice Baghdjian; editing by Blaise Robinson)

Based on the paragraph above can we conclude that "The shares only stayed at that level for a few days"?
It's impossible to say