The new warrants can be called by the Company at any time if the stock is trading above $0.18 at the time of an up-listing, OR if the Company continues to trade on the OTC for a period of 20 days at or above $0.18. - See more at:
http://www.thechairmansblog.com/amarantus-bio...ZiZsx.dpuf
Some weren't ready is another possibility.