Masumo Securities is trustworthy as it is regulated by Japan’s Financial Services Agency (FSA), one of the most reputable financial authorities. The FSA ensures that brokers follow legal guidelines to protect client funds. However, the company’s focus on traditional securities like stocks and bonds adds a layer of stability. While the regulation is clear, the unclear fee structure and lack of platform information might create some hesitation. If you're looking for high-risk trading opportunities like forex or crypto, you might need to consider other brokers.