The stock tumbled 17.46 per cent to Rs 590.60 on BSE.
At NSE, shares of the company nosedived 18.52 per cent to Rs 584.
The announcement was made yesterday when the domestic bourses were closed for Diwali.
The company said the acquisition will help it chart a roadmap to a deposit-taking franchise.
"Pursuant to all applicable regulatory approvals from relevant regulators in lndia and the UK... Indiabulls Housing Finance Ltd' is investing USD 100 million for 39.76 per cent stake in OakNorth Bank, a licensed UK commercial Bank... The company will be the largest shareholder in the bank," Indiabulls Housing said in a regulatory filing yesterday.
