Mortgage lender HDFC said it has acquired 6.43 percent stake in debt-trapped Reliance Capital by invoking pledged shares. These shares were acquired pursuant to invocation of pledge by security trustee on behalf of the corporation, which was pledged against a loan given by the lender in its normal course of business, HDFC Ltd said in a regulatory filing. Following this, the company acquired 25.27 crore shares of Rs 10 each, it said, adding that the total value of these shares are Rs 252 crore.