DUBAI, Jan 19 (Reuters) - Solid fourth-quarter results from Saudi Arabian blue chips may help boost the stock market there on Thursday while an overnight pull-back in oil and equity prices could constrain other Gulf markets.

The largest lender by assets, National Commercial Bank, made a net profit in the three months to Dec. 31 of 2.29 billion riyals ($611 million), a 7.5 percent rise, boosted by higher income from commissions and investments.

That was slightly ahead of estimates; analysts at Alistithmar Capital and SICO Capital had given forecasts for NCB's fourth-quarter net profit of 2.0 billion riyals and 2.09 billion riyals respectively.

Al Rajhi Bank, Saudi Arabia's second-largest lender, reported a 5 percent rise in fourth-quarter net profit to 2.05 billion riyals, meeting analysts' forecasts as financing, investment and other income increased.

Shares in NCB are trading at a small discount to analysts' average fair value estimate while Al Rajhi is trading at a premium, according to Reuters data.

The largest petrochemical maker, Saudi Basic Industries, made a net profit of 4.55 billion riyals in the three months to Dec. 31, a 47.7 percent jump. That was at the lower end of forecasts. SABIC said lower average operating and other non-core costs were the main reason for the rise in profit.

PetroRabigh may be bid up after it swung to a net profit of 183 million riyals in the fourth quarter from a loss of 1.01 billion riyals a year earlier, citing relatively stable operations and the positive impact on inventory valuations of feedstock price increases.

Sahara Petrochemical also swung to a net profit in the fourth quarter, citing higher sales volumes, product prices and income from subsidiaries.

Among telecommunications, Zain Saudi reported a narrower fourth-quarter loss, marginally beating estimates as revenue increased. Mobily swung to a loss but beat estimates.

Mouwasat Medical Services Co reported a 34.2 percent rise in fourth-quarter net profit to 72.2 million riyals, ahead of analysts' average forecast of 59.4 million riyals.

Brent crude oil futures ended Tuesday at their lowest level in a week, while MSCI's broadest index of Asia-Pacific shares outside Japan is down 0.4 percent after U.S. Federal Reserve Chair Janet Yellen signalled the central bank is poised to pursue a path of interest rate hikes.

(Reporting by Celine Aswad; Editing by Andrew Torchia) ((celine.aswad@thomsonreuters.com; +971 4 4536886; Reuters Messaging: celine.aswad.thomsonreuters.com@reuters.net))