ArcSight, Inc. (ARST +$2.31 or +10.51% to $21.97) gapped up today and hit a new all-time high with a considerable gain on heavy volume after reporting results for the quarter ended July 31, 2009. Volume was nearly 3 times its average daily volume as it blasted above its pivot point, triggering a technical buy signal.  Prior chart highs are now an important support level to watch on pullbacks, and any deterioration back into its prior base would raise concerns. Disciplined investors avoid chasing stocks more than +5% above their pivot point, and the window of time to take action within the investment system's guidelines can sometimes be brief.  It should be noted that the stock ended the week near its previously cited "max buy" level. ARST was featured in yellow in the 9/01/09 mid-day report with an annotated daily graph (read here) and it was also featured with more detailed analysis in the September 2009 CANSLIM.net News with an annotated weekly graph (read here).