ArcelorMittal sold a 10% stake in French pipemaker Vallourec for approximately $667 million, booking a 64% gain on its original investment made less than a year ago. The proceeds go directly to share buybacks, rewarding shareholders immediately. The steelmaker keeps a 17.3% stake & one board seat, signalling continued confidence in Vallourec's future. A 90-day lock-up on remaining shares ensures market stability