As of September 2025, 53.11% is owned by Indian Promoters and 46.89% by Public.

Top five Promoters holding highest number of shares of Simplex Castings company are Ketan Shah (30.70 lakhs shares / 39.49%), Sangeeta Ketan Shah (7.76 lakhs shares / 9.99%), Sim Prabha Estates & Trading Co.(P) Ltd (2.38 lakhs shares / 3.05%), Jayshree Sanjiv Haria (38300 shares / 0.49%) and Prabha Plantations ( P ) Ltd (7400 shares / 0.10%).