STUDENT TRANSPORTATION INC 5.25 PCT DEBS T.STB.DB.A

The players are back at it.

[Jmarks1]

Someone is playing this stock like a fine fiddle! 
Actually very cool to watch and see how it's done as long as your confident in STB and there is no material change. 
P.S. For you worry warts the ONLY fundamental change has been the addition of new contracts, so the rapid price movements should be expected after a large price run up.