ONGC Oil & Natural Gas Corpn Ltd Management Changes Announcement 2025 - Appointment of Chairman & CEO on contract ONGC approves one-year re-employment of Arun Kumar Singh as Chairman & CEO, effective 07 December 2025, pending regular succession or further orders..Find Corporate Announcements for Press Releases, AGM, Insider Trading & SAST, Results and Corporate Action for Oil & Natural Gas Corpn Ltd