Stock in Apple, maker of iPhones, iPads and Mac computers, closed at an all-time high price on Aug. 19 according to this CNET.com article published after the market closed that same day. The increase in price per share is likely an indication that buyers of Apple stock expect strong sales of Apple devices this fall. The current stock price increases are occurring as Apple watchers expect the company to announce a new iPhone at a media event, scheduled for Sept. 9, and to release the new products almost immediately thereafter. Media sources have nicknamed Apple's next phones the iPhone 6 and iPhone 6L.
Apple split their common stock in June, 2014, converting each share held then to seven shares. That's why the Aug. 19 closing price of $100.53 exceeded the previous record close of $700.10 set on Sept. 19, 2012. That 2012 record occurred shortly before Apple released its iPhone 5.
Since Apple has not shared any official details about their next phones, media speculation abounds. This article in International Business Times (IBT) touches on the latest iPhone rumors with a list of much-wanted improvements for the Apple smartphone. Larger screen sizes are all but a certainty given the leaked casing photographs from sources like Sonny Dickson who posted accurately colorful iPhone backs prior to last year's announcement of the colorful iPhone 5c. Longer battery life should probably top the list of desirable improvements given the many battery draining uses for phones today. IBT also speculates that Apple may change its default storage size to 32 megabytes. No one is predicting that Apple will make it easy for users to upgrade their own storage or insert fresh batteries.
So it's highly likely that Apple will release one or more iPhones in early September. Because the iPhone 5 series is two years old, people expect a major upgrade. The stock market seems to be predicting that this new iPhone will be a success and will generate higher sales than seen previously.