Here's the chart since the IPO:
The day's high is the all-time high.
Previously:
Oct. 2010
"Clean Energy Winners: EPA Emissions Trades" (CLNE; FSYS; WPRT; JCI)
Oct. 2010
T. Boone Pickens-- Score!: EPA Proposes Carbon Dioxide Regulations for Trucks, Buses, Pickups (CLNE)
Nov. 2010
Clean Energy Earnings: Natural Gas Truck Stocks (CLNE; FSYS; WPRT)
Mar. 2011
What's Moving: NatGas Transportation Stocks Pop in Advance of President's Energy Speech (CLNE; FSYS; WPRT)
April 2011
What's Moving? (CLNE; FSYS; WPRT)
June 2011
And Now for Something Completely Different: Natural Gas Engine Maker "We Don't Need $100 Oil or U.S. Help" (WPRT)
June 2011
Why Does George Soros Keep Buying Westport Innovations? (WPRT; CLNE; UNG)
Jan. 2012
As Natural Gas Collapses Who Benefits? (Soros) WPRT; CLNE; UNG
Jan. 2012
"Obama seeks to lift natural gas demand" (WPRT; CLNE)