Pfaudler Inc, which holds a 31.9% stake in GMM Pfaudler, will sell about 29.88% of its holding via block deals at a floor price of 1,700 rupees.
This is at a discount of 11.7% to the stock's close of 1,924.70 rupees on Thursday, Mint newspaper reported.
GMM Pfaudler did not respond to Reuters' queries on the promoter's stake sale.
(Reporting by Nallur Sethuraman in Bengaluru; Editing by Janane Venkatraman)