Idera rose 17.92% to $3.35 at 1:04 p.m. The stock opened at $2.86.
The stock is trading in the middle of its 52-week range of 52 cents to $6.87. It had a range today of $2.86 to $3.48 as of 1:04 p.m.
Idera was one of the biggest gainers among healthcare stocks and helped lead the sector upward along with Allergan (AGN - Get Report), which surged thanks to Pershing Square Capital Management, led by founder and CEO William Ackman, and Valeant Pharmaceuticals International's (VRX - Get Report) joint effort to pursue a takeover of the company.Must Read: Warren Buffett's 10 Favorite Growth Stocks SELL NOW: If you own any of the 900 stocks that TheStreet Quant Ratings has identified as a 'Sell'...you could potentially lose EVERYTHING in the next 6-12 months. Learn more STOCKS TO BUY: TheStreet's Stocks Under $10 has identified a handful of stocks that can potentially TRIPLE in the next 12-months. Learn more.