In a statement to Deadline, Guildhall said it had apologized to all alumni affected by the findings.
Guildhalls culture was described by alumni as unwelcoming and teaching practices were deemed to be hostile.
The report said Black students identities and personalities were suppressed rather than celebrated as part of learning processes.
Michaela Coel and Paapa Essiedu in ‘I May Destroy You.’ Both attended and experienced racism at Guildhall.BBC/HBO
In this environment, white students refused to work with Black peers.
It said Black alumni lacked trust in Guildhalls people, culture, and systems.
Deadlines Drama Schools Uncovered investigation has found that racism existed at Guildhall as recently as last year.
Guildhall said it was in constant dialogue with students about their experiences and the acting course is updated accordingly.
An acting advisory group also gives critical feedback and advice on anti-racist practices.
Clarification: The headline of this story was updated to clarify that Michaela Coel attended Guildhall.
The article makes clear that Coel experienced racism at the drama school.
