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.
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