Actually upon further investigation it appears that the date this notice was issued was April 11th and companies named in the lawsuit had till end of the day on May1st to respond . Check out the Neptune's chart and you notice the sudden rise in SP and volume starting May 2nd ..

http://www.usitc.gov/secretary/fed_reg_notices/337/337_877_notice04112013sgl.pdf

http://finance.yahoo.com/echarts?s=NTB.TO+Interactive#symbol=ntb.to;range=5d;compare=;indicator=volume;charttype=area;crosshair=on;ohlcvalues=0;logscale=off;source=undefined;

http://finance.yahoo.com/echarts?s=NEPT+Interactive#symbol=nept;range=5d;compare=;indicator=volume;charttype=area;crosshair=on;ohlcvalues=0;logscale=off;source=undefined;