Antares Pharmaceuticals prior to the announcement had a ticker AIS on the Nyse - Amex board, then changed its symbol to 4 letters to ATRS on June 15th.
They did announce some positive news on June 26th but the market yawned that and the few following days. No other news is responsible for the price rise to $5.58, thus we can say the NASDAQ announcement had a strong influence on the stock.
Note: It took about 6 weeks for the stock to hit its peak after being announced. This would place Vringo's timeline roughly at the end of May. With a probable announcement of Vringo's addition to the Russel 2000 Index in early June and inclusion in late June, we have a fairly positive backdrop regardless of fundamental news.