Can a securities company issue a certificate that there is no subsidy for the internship?

I can't. Under normal circumstances, securities companies will not provide subsidies for internships. Without subsidies, there is no proof. However, some subsidies may be provided during the internship, which requires the internship applicant and the company to reach an agreement. If the company provides subsidies to interns, it will issue corresponding certificates, such as receipts or invoices, which can be collected from the company after the work is completed.