Spanish translation: acciones cotizadas a un precio muy bajo
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Explanation: Although the glossary on the web site of the Banco de Santander in Spain offers the term "chicharro", it does not seem to be widely used.
Both of the business dictionaries I consulted (Barron's and Wiley's) defined the term rather than translate it. So I assume there is no general translation that would be understood across the Spanish-speaking world.