Maruti, India's top carmaker, in a statement late on Wednesday provided details on pricing and funding of capacity expansion in the proposed contract manufacturing arrangement with Suzuki, which owns 56% of Maruti.
Maruti shares were down 5.1% at 1,580 rupees by 12.49pm. Some analysts said the statement fell short of adequately justifying the move, which departs from Maruti's practice of making cars at its own plants in India.
Stock markets were shut on Thursday.
"It is clear there is no systemic efficiency gain due to this deal – thus any value accretion to Suzuki is at Maruti's expense," Jefferies said in a research note.
Maruti has said it would buy the cars from the Gujarat plant at a price that would include only the cost of production and additional capital expenditure needs of the plant.
Maruti will also produce cars at its existing plants in Manesar and Gurgaon in north India that together have a capacity of 1.5 million vehicles per year.