The remarks come in the backdrop of RBI banning foreign investors from picking up more shares in HDFC Bank.
Under the present laws, with HDFC's 22 per cent stake, foreign holding in HDFC Bank exceeds the permissible limit of 74 per cent.
HDFC Bank, however, says HDFC held the stake in its before 2009 and changes in law cannot apply retrospectively.
"We have got legal opinion from one (former) chief justice and another (former) Supreme Court judge, which fundamentally says that since HDFC's holding was there in HDFC Bank prior to the law on deemed foreign companies being passed, that they should be grandfathered," HDFC Bank MD and CEO Aditya Puri said.
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At the end December, 2009, FIIs held 59.37 per cent in HDFC.
The government had amended the foreign holding definition in 2009, under which an entity with over 50 per cent overseas investment or controlled by foreigners, is considered foreign-owned.
Parent HDFC is considered foreign as FIIs hold 74 per cent stake in it as on December, 2013.
As per the existing norms, a bank is required to take FIPB approval for increasing its foreign shareholding limit (FII and FDI) beyond 49 per cent and up to 74 per cent respectively. The investment till 49 per cent can be done through automatic route.
Apart from HDFC's 22.64 per cent, foreign institutional investors own 34.08 per cent in the bank, 0.03 per cent is with qualified foreign investors, 0.33 per cent with NRIs and 16.97 per cent with overseas depository receipt holders.
Puri said the bank has taken the advice of former Chief Justice of India SP Bharucha and former Supreme Court judge B N Srikrishna on the matter, to come to this conclusion.