The stock after making a weak opening tumbled further by 4.22 per cent to Rs 19.25 on BSE.
On NSE, shares of the company lost 4.46 per cent to Rs 19.25.
For the second time in a span of a week, Fitch downgraded RCom to the lowest category with some hope for recovery of principal or interest amount while Moody's Investors Service downgraded the firm to the second lowest category.
RCom's net debt stood at around Rs 45,000 crore as on March 31 this year. The lenders of the company have given it seven months time to repay debt.
Credit rating indicates capability of a company to pay back debt.