Asked for comment, an Adani Group spokesperson said in an email that the share sale was going "as per schedule", without elaborating.
The Adani Group has called the report baseless and said it was considering taking action against Hindenburg.
Friday's 20% fall in shares of group flagship Adani Enterprises dragged it 11% below the minimum offer price of the secondary sale.
Adani had set a floor price of 3,112 rupees ($38.22) a share and a cap of 3,276 rupees, but Adani Enterprises closed on Friday 2,761.45 rupees.
A fourth source said Adani management is also discussing the share sale internally to decide on next steps.