Ericsson

(ERICY)

slipped 4.2% in midmorning after hitting a 52-week low of $8.94.

Lehman Brothers

downgraded the stock to market perform from buy a day after a

Gartner

report said Ericsson's share of the mobile phone market has fallen below 10%.

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Ericsson said today that a high-level executive in its mobile phone unit would leave the company.

Rival

Nokia

(NOK) - Get Report

was off 4.4% and

Motorola

(MOT)

slid 2.9%.