From What's Trading:
3D Systems (DDD) rallies $4.30 to $70.12 in active trading of 3.1 million shares and new record highs, but with no headlines to explain the 7 percent rally in shares of the Rock Hill, SC maker of 3D printers and other devices. On the options front, trading is brisk and implied volatility is moving sharply higher as well. 12,000 calls and 13,000 puts so far. The top trade is a May 50 – 60 put spread, apparently bought for $1.10, 900X....MORESee also the post immediately below:
What's Moving: 3D Printer Arcam AB Up 10.72% (AMAVF)