Mizuho to give Mizuho Cowork AI agent to 30,000 staff

Mizuho's plan stands out less for the size of the rollout than for the scope of the work it targets. Travel expense processing, social media analysis and business audits are not the repetitive, rule-bound chores that companies usually hand to automation first; they involve judgment and context. By aiming the agent at these areas, Mizuho is testing whether AI can take on work that has traditionally stayed with people.

The mechanism the group describes is a 'skills' function that shares veteran employees' know-how. That points to a second goal beyond efficiency: capturing the tacit knowledge of experienced staff in a form the agent can reuse. If it works, the agent would not just process tasks faster but would carry expert practice into everyday desktop work across the group.

The rollout is planned for fiscal 2027 and spans Mizuho FG, Mizuho Bank and Mizuho Trust & Banking. That timing gives the group room to develop and refine the skills before putting the agent in front of roughly 30,000 employees, a scale that would make it one of the more ambitious workplace AI deployments by a Japanese financial group.