pink sheetn. (usually in pl.) U.S.Stock Market a daily list of otherwise unlisted over-the-counter stocks and shares, printed on pink paper; the market in these stocks and shares.
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1959 Appeal-Democrat (Marysville–Yuba City, Calif.) 7 Aug. 2/2 They publish ‘pink-sheets’ quoting as many as 10,000 securities.
2003 N.Y. Times 16 Mar. iii. 6/2 Some are also listed in the pink sheets, the American over-the-counter market for small, infrequently traded securities.