ETFbook has successfully raised €4 million in a Series A funding round led by BlackFin Capital Partners. The funds will be utilized to enhance its global data and analytics platform focused on exchange-traded funds (ETFs). This development highlights the growing interest and investment in ETF-related technologies and services, as evidenced by the ongoing discussions and mentions of the '#ETF500' initiative across social media platforms. Prominent figures, including Elon Musk, have been tagged in relation to the '#ETF500' discussions, indicating a potential connection to broader market movements or innovations in the ETF space.