HEG HEG Ltd Company Mergers Announcement 2025 - Stake Increase HEG Ltd has increased its stake in GrafTech International Ltd. from 8.23% to 9.98% by investing INR 34.59 Crores, raising its total investment to INR 283.21 Crores as of the announcement on May 6, 2025..Find Corporate Announcements for Press Releases, AGM, Insider Trading & SAST, Results and Corporate Action for HEG Ltd