Indian stock markets experienced midday pressure, with the Nifty 50 and BSE Sensex declining. Despite the broader market weakness, several individual stocks showed significant movement. Hindustan Copper and Hindustan Zinc saw gains driven by strong copper and zinc prices, respectively. Vedanta rose after securing a critical mineral block auction. Conversely, Punjab National Bank shares fell due to a reported Rs 2,434 crore loan fraud linked to SREI entities, while some railway stocks also declined.