Updated from 11:32 a.m. EST to provide closing prices.



) --


(GRPN) - Get Report

shares suffered after Chairman and Co-founder Eric Lefkofsky said in a

blog post

that he plans to step back from day-to-day work with the company so he can dedicate more time and attention to his venture-capital firm,



"I look forward to continuing to work with

Groupon CEO Andrew

Mason in my ongoing role as Chairman of the Board, but in the meantime, I've immersed myself in Lightbank and am focused on growing the company and working with

Managing Partner Brad

Keywell and the rest of the Lightbank team to try to define what it should be as it matures," Lefkofsky wrote.

Groupon has fallen 66.33% since its IPO, making it the worst-performing IPO of the last year, according to a

Bloomberg report

. Shares closed down 7.57% at $8.79 on Tuesday.

Research in Motion

( RIMM) closed down 1.87% at $7.35 on Tuesday, despite chatter in the blogosphere about the company's product roadmap.


BlackBerryOS.com blog

reported that BlackBerry 10 would be released in the first quarter of 2013. The report also said the latest BlackBerry would be launched in Europe next January -- 3 to 4 weeks prior to the launch in North America.


(MSFT) - Get Report

assertion that the $6.2 billion

asset impairment charge

it announced on Monday will not impact its ongoing business or financial performance seems to resonate with investors. The software giant's shares closed up 0.65% to $30.76 on Tuesday.

Shares of


(MU) - Get Report

rose a day after the company announced the


of bankrupt Japanese rival

Elpida Memory Inc

and a stake in

Rexchip Electronics


Elpida and Rexchip's manufacturing capabilities will roughly double Micron's capacity to make DRAM memory chips, which are a key component of smartphones and mobile devices. Micron's stock ended the day up 1.16% at $599.41.

--Written by Nathalie Pierrepont in New York.

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