Promotora y Operadora de Infraestructura, S. A. B. de C. V. (OTCMKTS:PYOIF – Get Free Report) was the target of a large growth in short interest in December. As of December 15th, there was short interest totalling 61,500 shares, a growth of 24.7% from the November 30th total of 49,300 shares. Based on an average […]