An investigation found that TGP Europe had committed a number of anti-money laundering and social responsibility failures through its white-label brands.
The operator currently runs 19 active websites, including 12bet.uk, 8xbet.co.uk and stake.uk.com.
The Gambling Commission found that TGP Europe breached multiple paragraphs in the 12.1.1 licence condition that deals with the prevention of money laundering and terrorist financing.
The operator did not have risk assessments in place to deal with situations, such as stolen identification documentation being used to falsely verify customers or unusually large and complex transactions being made.
Furthermore, any policies that were established during its white-label agreements were regarded as ineffective, and it was deemed that TGP Europe had not fully considered the money laundering risks that these relationships presented.
In regards to the social responsibility failures, the operator repeatedly allowed customers to continue wagering without intervention, despite multiple safer gambling alerts being triggered.
It was also found that customers were presented with automated interactions in the safer gaming alerts, rather than a trained support advisor.
No kind of assessments were made on how effective these measurements were by TGP Europe, nor if any further steps were necessary to protect the customer.
As well as a £316,250 penalty, further licence conditions will be placed against the operator to ensure additional due diligence checks are completed.
The Gambling Commission noted that TGP Europe was cooperative throughout the investigation and did take corrective measures against the failings.