 Shares of Zendesk Inc. ZEN, -4.92 rose more than 4 in the extended session Tuesday after The Wall Street Journal, citing people familiar with the matter, said that the software company is in talks with activist investor Jana Partners LLC. Zendesk and Jana are discussing a truce that could involve Chief Executive Mikkel Svane stepping down, in addition to changes to the board, including removing director Carl Bass, the Journal reported. 