Icahn's Oct. Apple tweet not as sweet as August's

Carl Icahn
Getty Images (L) | David Grogan | CNBC (R)
Carl Icahn

Carl Icahn's 45 tweets have garnered a good amount of attention, but his recent chattering about Apple has not seen much action.

Specifically, the activist investor's demands last week that Apple do a massive share buyback moved the stock little and generated far less trading than his August tweet revealing his "large position" in the company.

Andrew Wilkinson, chief economic strategist at Miller Tabak, analyzed both Icahn tweets (which is news enough in itself that a top investment official at a big New York house is analyzing tweets).

(Read more: Pimco's Gross tells Icahn to leave Apple alone)

In the August tweet, according to Wilkinson:

Mr. Icahn's August announcement of his stake in Apple riveted tech-hopefuls driving shares 6 percent higher on heavy volume. Throughout the remaining two-hours of trading and until the close the following day, 45 million Apple shares traded closing 4.57 percent higher.

Last week's dust-up, though, had less impact despite its heavy parsing among the financial media, Wilkinson found.

(The) latest Tweet was far less successful in driving Apple ahead. While shares closed 1.76 percent higher following the Tweet by Thursday's close, the announcement generated far less buzz amongst investors. Overall volume over the comparable period since Wednesday's Tweet is just 15 million shares (not including Monday's activity) and is therefore just one-third of the August total.

Apple reports earnings after the closing bell Monday, likely providing clues about the efficacy of Icahn's interest in the company.

—By CNBC's Jeff Cox. Follow him on Twitter @JeffCoxCNBCcom.