COLOMBO Dec 23 (Reuters) - Sri Lankan shares closed marginally higher on Wednesday, snapping a two-session losing streak in thin trade ahead of a long weekend, led by market heavyweight John Keells Holdings.

Turnover slumped to the lowest level since March 24, 2014 at 205.2 million rupees ($1.43 million), against this year's daily average of 1.08 billion rupees.

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The market is expected to be lacklustre with low turnover due to year-end holidays starting this week, stockbrokers said.

Markets will be closed on Thursday for a Buddhist religious holiday and on Friday for Christmas.

The main stock index ended 0.06 percent firmer at 6,858.64, after hitting its lowest close since Dec. 16 in the previous session.

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Foreign investors sold a net 9.3 million rupees worth of equities, extending the net outflow to 4.27 billion rupees so far this year.

John Keells, the country's top conglomerate, closed 0.5 percent higher. ($1 = 143.7500 Sri Lankan rupees) (Reporting by Shihar Aneez; Editing by Subhranshu Sahu)