SAO PAULO, March 25 (Reuters) - Brazilian soy seed producer Boa Safra said on Monday it has hired banks to assess a potential primary share offering of at least 200 million reais ($40 million).

The company hired BTG Pactual, Bradesco BBI, XP Inc and Santander to advise it on the potential offer.

Its controlling shareholders, Marino Stafani Colpo and Camila Stafani Colpo Koch, as well as investor HIX Investimentos, have committed to subscribe to up to 120 million reais worth of shares.

The offering is still subject to market conditions and corporate approvals, Boa Safra said in a securities filing. ($1 = 5.0021 reais) (Reporting by Peter Frontini; Editing by Sharon Singleton)