Apple shares broke out over $170 in aftermarket trading last night and rallied to a new all-time high on earnings and guidance. A flurry of activity on the open is likely on this news, the big question is whether Apple shares can sustain the gains through the day and post a positive weekly close, or if some traders could start to take profits ahead of the weekend. A Friday close above $170 and even the $165 recent breakout point would confirm the start of a new upleg on trend. A reversal below $165 could be seen as a sign of exhaustion and reversal.