CORRECTED - HEADLINE STOCKS-Some U.S. stocks on the move on July 9

(Corrects entry on Alcoa to show that the results were for the company's second quarter) (Updates to after the open, adds Citigroup, Merck, Rigel, Target, Map Pharma/AstraZeneca, AIG, FCStone and Broadcom/Emulex)

NEW YORK, July 9 (Reuters) - Some U.S. stocks on the move on Thursday:

ALCOA INC (AA.N)

The aluminum company late Wednesday reported a second-quarter loss that was narrower than expected, helped by cost-cutting measures. [ID:nN08471164]

Shares of the Dow component gained 4.3 percent to $9.87.

MERCK & CO (MRK.N)

The company bought exclusive rights from Portola Pharmaceuticals to develop and commercialize an oral blood thinner used to prevent stroke in patients with atrial fibrillation, one of the most common abnormal heart rhythms. [ID:nN09546313]

Shares of the Dow component sank 2.4 percent to $27.40.

CITIGROUP INC (C.N)