Shake Shack (SHAK) struggled a bit in the weeks following its IPO, but the stock has now gained more than 50% from its February lows. As shown in the chart below, yesterday the stock broke above resistance that had formed from its IPO-day intraday high. If Monday was a good day for shareholders, though, Tuesday was a great one. The stock started out in the red, but it turned around at 10 AM ET and didn’t look back. From 10 to 11:30, the stock rallied from $52 to $56+ on a surge of buying volume. As if that wasn’t enough, it then went on to surge another $2 in the final half hour of trading to close just under $60/share. For investors that like to see big volume on up days, they got it with Shake Shack (SHAK) today. The stock did double its average volume and gained 11.62%.