 Shares of Nuveen AMT-Free Municipal Credit Income NYSE:NVG shot up 0.1 on Wednesday . The stock traded as high as 16.80 and last traded at 16.76, 13,756 shares changed hands during mid-day trading. A decline of 96 from the average session volume of 372,600 shares. The stock had previously closed at 16.75. The company has ... 