Identifying Mr. Thompson's Behavioral Bias

As a private wealth manager, you are considering the behavioral biases that might affect your client, Mr. Thompson. He has recently inherited a substantial sum and wants to invest it wisely. Despite having moderate experience in investing, Mr. Thompson exhibits a strong tendency to cling to his past investment successes, often demonstrating overconfidence in his abilities. His belief is that his previous successful investments reflect skill rather than chance, and he often disregards market trends and advice from financial professionals.

Considering these factors, which behavioral bias is most likely influencing Mr. Thompson's investment decisions?