Craigs Investment Partners investment adviser Amelia Wong. (Image: Supplied)For the second week in a row, Serko is on track to be the week’s biggest gainer on the NZX 50, up 12.84% as of 2pm on Friday.BusinessDesk’s Weekly Wrap of stocks over $0.10 shows the travel booking tech company having a solid run after posting a positive operating update to investors in late July, affirming its May guidance for total revenue to be between $128 million and $134m. And with gains of 7.28%, Oceania Healthcare is the second-biggest gainer this week.Craigs Investment Partners’ investment adviser Amelia Wong&nbs...