Meaning of しょうそくすじ in Japanese

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Definition of しょうそくすじ

しょうそくすじ(shousokusuji) 【消息筋】

(n) informed circles
消息筋によると、○○社は東証一部への上場を準備している。
According to informed sources, ____ Ltd. is preparing for the move up to the first section of the Tokyo Stock exchange.