According to the roadmap ( http://www.highcharts.com/support/roadmap
), support for box plots will be added in version 3.0 slated for this coming winter.
A bullet graph, while very useful, is not related in any meaningful way to a box plot.
The candlestick is pretty close, but missing a couple of key features.
It is possible to modify the source code, copying and building on the candlestick or the OHLC to create a new boxplot type while we wait for the official support...