June 17 (Bloomberg) -- KTCS Corp. jumped the most in seven weeks in Seoul trading after saying it plans to buy back 3.8 million shares to stabilize its stock price. The South Korean operator of phone directory assistance services gained 8.4 percent to 2,140 won as of 9:03 a.m. on the Korea Exchange, heading for its biggest gain since April 29. The benchmark Kospi Index added 0.5 percent.
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