The stock tanked 11.23 per cent to settle at Rs 20.15 on BSE. During the day, it had slumped 13.65 per cent to Rs 19.60.
At NSE, shares of the company fell sharply by 11.45 per cent to end at Rs 20.10.
Shares of United Breweries also fell by 2 per cent to Rs 787.20.
The Vijay Mallya-led United Breweries Holdings Ltd today said it has been declared a "wilful defaulter" by PNB and the company is consulting lawyers to challenge the decision.
On its future course of action, UBHL said: "The company is in consultation with its legal counsel to challenge the decision by taking appropriate legal action that may be required in this regard.