DUBAI, July 17 (Reuters) - Gulf stock markets moved little early on Sunday as the failed coup attempt in Turkey kept investors cautious, while Saudi Arabia's largest listed bank dropped after reporting second-quarter earnings.

The Saudi index .TASI edged up 0.3 percent in the first 50 minutes of trade as Almarai 2280.SE climbed 2.7 percent after it said second-quarter net profit rose 18.6 percent year-on-year to 628.8 million riyals ($167.7 million), beating analysts' average forecast of 530.3 million riyals.

But National Commercial Bank 1180.SE fell 1.5 percent after its quarterly profit came in at 2.44 billion riyals, at the low end of estimates; analysts had on average expected 2.54 billion riyals.

The failed coup attempt in Turkey is expected to have little financial impact on the Gulf because trade and investment ties are relatively minor. Nevertheless, fund managers said the event made some investors more wary of buying.

Qatar National Bank QNBK.QA , which last month completed the acquisition of Turkey's Finansbank FINBN.IS , fell 0.7 percent, helping to pull the Qatari stock index .QSI down 0.4 percent.

Dubai .DFMGI edged up 0.3 percent as builder Arabtec ARTC.DU , the most heavily traded stock, jumped 4.0 percent. On Thursday it said major shareholder Aabar Investments had agreed to give it a 400 million dirham ($109 million) debt facility to help it weather "challenging" conditions in the industry.

Abu Dhabi .ADI added 0.1 percent although Abu Dhabi Islamic Bank ADIB.AD sank 3.5 percent after it posted on Thursday a 1 percent rise in second-quarter net profit but warned it was restricting the amount of new credit it provided because of an increase in defaults across its business lines.

Bahrain .BAX underperformed the region, dropping 0.7 percent, after Saudi-owned Al Arabiya television reported that a court had dissolved the country's main Shi'ite Muslim opposition group al-Wefaq and liquidated its funds, advancing a crackdown on the Gulf kingdom's opposition.

(Reporting by Andrew Torchia) ((andrew.torchia@thomsonreuters.com; +9715 6681 7277; Reuters Messaging: andrew.torchia.thomsonreuters.com@reuters.net))