Mizuho secures key role in Anthropic's global IPO, challenging Nomura

• Mizuho has secured a key role in Anthropic's global IPO.
• This is the third major deal in a series where Mizuho has played a significant role.
• The IPO is seen as a challenge to Nomura's dominance in Japan's financial sector.
• Anthropic's listing is part of a series of blockbuster deals.
• Mizuho's involvement highlights its growing influence in global financial markets.