Several electric vehicle (EV) manufacturers, including Tesla ($TSLA), Rivian ($RIVN), and Nio ($NIO), have been downgraded by Mizuho due to slowing sales and near-term headwinds in the EV market. Mizuho has adjusted its price targets for Tesla to $195, Rivian to $12, and Nio to $5.50, marking a significant shift in the investment bank's outlook on these companies. The downgrades come amid concerns over slowing EV demand and pricing pressures, signaling potential challenges ahead for the once rapidly growing sector.