US short-seller Hindenburg Research, whose report critical of the Adani Group led to a massive stock rout last year, had shared an advanced copy with a client two months before publishing it, said the Indian markets regulator. This "collusion" led to "unfair" profits from a deal to share spoils from stock price movements, the Security Exchange Board of India (SEBI) said in a 46-page show cause notice to Hindenburg.