The chart shows that while Apple stocks received a significant bump upon the announcement of the original iPhone, this was not the case regarding the iPhone 3G, 3GS and 4 models - though interestingly, stocks rose after the announcement of the iPhone 4S.
Investors seemed to be a bit skeptical upon the announcement of the first iPad, but seemed more confident when Apple unveiled the iPad 2. Data appears to show that stocks might have been losing a bit of steam upon the announcement of the New iPad.
As a whole, Apple stocks see a spike at the days of all major product announcements.
Hat tip to Statista.