Here are the numbers after round 15 of counting at 16:40 hrs for the RK Nagar by-election constituency:

• Independent Candidate TTV Dhinakaran leads after the fifteenth round with 72,413 votes. Leads nearest rival by 33,447 votes.
  
• AIADMK's Madhusudhanan trails with 38,966 votes
• DMK's Marudhu Ganesh stands third with 20,388 votes