https://www.reuters.com/article/us-alibaba-stocks-jack-ma/alibabas-jack-ma-sells-8-2-billion-worth-shares-stake-dips-to-4-8-filing-idUSKCN24E0K1 >Alibaba Group Holding Ltd co-founder Jack Ma has cut his stake in the company over the past year to 4.8% from 6.2%, cashing out around $8.2 billion at its current share price, the firm's annual filing released on Friday showed.