Watch out for these penny stocks locked in the upper circuit on March 20 Watch out for these penny stocks locked in the upper circuit on March 20 Indian equity indices Sensex and Nifty50 began the week on a sour note amid mixed swings in other Asian markets. Kaustubh Bhosale / Monday, March 20, 2023 / Article rating: 3.9 Even as investors breathed a sigh of relief upon hearing of a purchase for the struggling Credit Suisse.