Premarket Roundup: Costco, Accuray

Among the premarket stories for Tuesday, August 25, from AP Financial News:

NEW YORK (AP) — An analyst upgraded Costco Wholesale Corp. on Tuesday, citing the likelihood that business trends will stabilize.

NEW YORK (AP) — After Accuray Inc. reported disappointing fiscal fourth-quarter results and gave a weak outlook for the coming year, a Jefferies & Co. analyst said he is concerned about the medical radiation equipment maker's backlog and slowing growth in new orders.

NEW YORK (AP) — Shoppers are still "picky," according to one retail watcher, but stores' discounts are propelling merchandise for children and young adults as the back-to-school season nears its peak.

HARTFORD, Conn. (AP) — An analyst downgraded Valmont Industries Inc. Tuesday following a rally in shares of the diversified manufacturer.

HARTFORD, Conn. (AP) — Shares of large defense contractors should remain stagnant as Washington continues to spend stimulus money on the economy rather than defense, an analyst said Tuesday.

HARTFORD, Conn. (AP) — Domtar Inc. is benefiting from slowly improving paper markets and less debt, an analyst said Tuesday as he boosted his price target on the pulp and paper maker.