Top increases in # users holding for stocks held by Robinhood traders today:    1. $IDEX: +27873 2. $KTOV: +17154 3. $CIG.C: +16788 4. $SHLL: +14073 5. $SINT: +7877 6. $AAPL: +6993 7. $SONO: +6914 8. $SPCE: +5713 9. $AMZN: +5247 10. $NIO: +4829