RT Weihua Li 李卫华 (@Weihua_Li1)About 1/4 of IPOs on Nasdaq’s smallest listing tier since 2023 were promoted in WhatsApp chats, and then crashed or were suspended by @SECGov over potential stock manipulation.For @business, how apparent pump and dump schemes thrived on Wall Street.https://t.co/mShRDEYkYD ...