GHBAW vs GHBAZ. Both are WARRANTS and GHBAA is the stock. GHBAW has a strike of 50 dollar and expires on 3.7.2011, just 3 months to go here for the W. GHBAZ has the same strike and has an expiration date 3.7.2013 so still 27 months to go here for the Z. GHBAZ traded last 0.009 . A major discount versus GHBAW as it has a much longer lifetime.