This morning, Lehman Brothers downgraded several electronic manufacturing services companies, citing the market's risky "current tech environment."

In a note this morning, the firm lowered

Jabil Circuits

(JBL) - Get Report

,

Plexus

(PLXS) - Get Report

and

SCI Systems

(SCI) - Get Report

to buy from strong buy and

DDi

( DDIC) to market perform from strong buy.