I have developed an interest in this company and in the process of kicking the tires, came across your March 31st post. Would like to comment. The only Form SC 13D filing I found for that date was by Starboard Value LP, so I am assuming that is the filing to which you refer. There is no new 10+ mil purchase. Starboard Value does own 9,154,282 shares common, which makes up 8.3% of their portfolio. The filing is an amendment to a previous filing, and is put forth as a matter of record that one of their managing partners is no longer a member of the Board of Unwired Planet, Inc. "On March 26, 2014, Peter A. Feld resigned from his position as a member of the Board. Mr. Feld's resignation was not related to ay disagreement or dispute with the Issuer."
There were no new transactions by Starboard Value LP during the preceding 60 days. However, since their last filing in July 2013, they have increased their share ownership by 641,282 shares, which brings them to the 9,154,282 identified in the March 31, 2014, SC 13D/A filing. Still positive. Good trading to you.