The partly paid-up shares of Tata Steel have been at the receiving end this week. The shares crashed to their lowest level since listing in March. From ₹127.20 last Friday, they crashed to ₹80.35, down 37 per cent; the fully paid-up stock slumped 10 per cent at ₹503.20. The partly paid-up shares came into existence this March when the company raised ₹12,800 crore via a rights issue. Investors will keenly watch whether they regain the premium over the fully paid-up stock.