The company's delisting plans had been pending as the regulator was probing an alleged collaboration between the company and the Elliot Group of investors. The probe is based on a complaint that was filed with Sebi.
In November 2014, minority shareholders of Astrazeneca had moved SAT over alleged collaboration between the company and the Elliot Group of investors.
SAT in the pronouncement has directed Sebi to finish the probe in coming six months.