Seamec said HAL had acquired 17.28m shares,or 51% of its equity.
This would have cost INR 1.67bn ($28.24m)at the offer price of INR 97 per share.
New Delhi-based HAL had agreed in April to buy the majorityholding from the French subsea giant, which owns a 75% stake.
The deal triggered an open offer to othershareholders for the remaining 25% of outstanding shares in the Bombay-listedcompany.
Seamec