As of February 2024, 68.43% is owned by Indian Promoters and 31.57% by Public.

Top five Promoters holding highest number of shares of Atmastco L company are Subramaniam Swaminathan Iyer (73.04 lakhs shares / 29.53%), Bodies Corporate (52.89 lakhs shares / 21.39%), Apex Steel And Technology India Private Limited (49.21 lakhs shares / 19.90%), G Venkataraman (35.83 lakhs shares / 14.49%) and Jayasudha Iyer (3.82 lakhs shares / 1.55%).