When trading on the US, there are regulatory fees when it comes to selling shares. These are charged independently to your brokerage costs. If you’re not paying these, you’re not trading in the US for real. 

These sell side fees are: 

• SEC Fee $0.2290 per US$10,000 of 
sale proceeds

  An SEC Fee for the costs involved in their regulation of equity dealers and the equities market.
  
  

• TAF Fee $0.000130 per share with a per-transaction cap of $6.49
  A fee to support FINRA (a US regulatory body) fee to support them operate on a cash-flow neutral basis.
  
  

You will see these recorded on trade confirmations and statements in reporting documents.

Pricing guide here.