Why Apple’s shares bounced back from last week’s fall

FORTUNE -- "Our weekly iPhone sales continue to be impacted by rumors and speculation regarding new products," Apple (aapl) CEO Tim Cook told analysts last Tuesday even as his company's share price was plummeting. Apple's iPhone sales had fallen short of expectations, and the Street was punishing the stock.

But rumors and speculation can also drive Apple shares in the other direction, and that's what seems to be happening this week.

On Monday morning, iMore's Rene Ritche posted that he'd heard "from sources who have proven accurate in the past," that Apple was planning to unveil a new iPhone, and maybe an iPad mini and an updated iPod, at a special event on Wednesday, Sept. 12, 2012 -- a rumor picked up and retailed to their readers by more than three dozen other tech reporters.

The Sept. 21 iPhone date -- which was earlier than many had expected -- was "confirmed" a few hours later by John Paczkowski on AllThingsD, a site owned by the Wall Street Journal, and passed along to clients by several Wall Street Analysts, including Topeka Capital's Brian White, and, by Tuesday morning, Morgan Stanley's Katy Huberty.

Result: Apple shares rose $9.87 (1.7%) on Monday and were up more than $7.70 (1.3%) in pre-market trading Tuesday. That would bring them back to roughly where they were before last Tuesday's quarterly report.

UPDATE: Apple closed at $610.76, up $15.73 (2.64%) on a day that the Dow fell 0.49%.

Die by the iPhone rumor, live by the iPhone rumor.

All products and services featured are based solely on editorial selection. FORTUNE may receive compensation for some links to products and services on this website.

Quotes delayed at least 15 minutes. Market data provided by Interactive Data. ETF and Mutual Fund data provided by Morningstar, Inc. Dow Jones Terms & Conditions: S&P Index data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. Terms & Conditions. Powered and implemented by Interactive Data Managed Solutions