/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=23346

osha dot gov site,,,
quote OSHA's official reply to the question...
You further ask who must maintain the training and certification records. Paragraph (l)(6) does not specify who must maintain the records; however, the employer is ultimately responsible for ensuring the availability of these records. Third-party trainers who agree to maintain the records would also need to ensure their immediate availability to the employer.