Top 20 US stock transactions: Pinduoduo closed up 2.9%, with BlackRock increasing holdings in the second quarter. Ranked 15th, Pinduoduo closed up 2.92% with a transaction volume of $2.103 billion. According to regulatory disclosure documents, BlackRock held approximately 29 million shares of Pinduoduo in the second quarter of this year, equivalent to 2.1% of the total share capital. According to a document disclosed by the US Securities and Exchange Commission (SEC) on October 21, BlackRock's shareholding has significantly increased to approximately 132 million shares, equivalent to 9.5% of the total share capital.