Shares of eight Adani Group firms out of the ten listed entities ended the day in the negative territory, extending their previous day decline, amid an overall weak trend in the equity market. On Thursday, Adani Transmission stock declined by 5 per cent, Adani Green Energy dipped 5 per cent, Adani Total Gas (4.99 per cent) and Adani Power (4.98 per cent) on the BSE.