At 0214 GMT, Quanta had fallen 0.91 percent to T$38.20, while Compal was unchanged at T$19.60. Both companies underperformed the benchmark TAIEX share index's 2.31 percent rise.
Compal told Reuters on Tuesday it would miss its 2008 shipment target of 27 million PCs, and that its November shipments had been 20 percent lower than expected.
Quanta and Compal together manufacture more than half of all the world's laptop computers for the world's top brands such as Dell and Hewlett-Packard, and their shipment numbers provide a gauge to global demand for tech buys.
JP Morgan said in a research report on Wednesday that Compal's weaker momentum when compared to other contract manufacturers was a concern.
It had previously downgraded the company to "neutral" from "overweight", and cut Compal's target price to T$16 from T$36.
Goldman Sachs, which also released a report on Wednesday on Taiwan's notebook market, said that weak consumer demand meant that the worst was not yet over.
"The recent market strength in tech stocks (especially in upstream and semi related stocks) could be a bear market rally rather than a recovery of end demand, in our view" Goldman Sachs analysts Henry King and Kevin Lu wrote in a research note.
(Reporting by Kelvin Soh; Editing by Ken Wills) Keywords: QUANTA COMPAL/SHARES
(kelvin.soh@thomsonreuters.com; +886 2 2508-0815; Reuters Messaging:kelvin.soh.reuters.com@reuters.net)
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