I wondered what effect the Jobs keynote had on Apple’s stock price
in the short term. What if you invested $10,000 the day before the
keynote, then sold at the end of the keynote day? What if you
waited until the day after? What if you did this every year for
the past ten years that Jobs has been doing them? Is it possible
to make money off the Apple keynote talks given by Steve Jobs?
So he put this site together. It’s now defunct — he stopped updating it after Apple stopped participating in Macworld Expo — but the Internet Archive has it. Bottom line: historically, Apple’s stock price fell more than it rose on the day of (and day after) Steve Jobs product announcements.