The Chainsmokers f/Daya's "Don't Let Me Down" (Disruptor/Columbia) will remain in the #1 spot at T40 this week. Sia's "Cheap Thrills" (RCA) continues to climb up inside the Top 10 and should be this week's Greatest Gainer. Kent Jones' "Don't Mind" (WeTheBest/Epic) moves up to #13 and looks to be headed Top 10 followed closely by label mate Meghan Trainor, whose single "Me Too" moves Top 15. Republic has two songs moving up inside the Top 20; Shawn Mendes' "Treat You Better" (Island/Republic) and DNCE's "Toothbrush" (Republic). Flume f/Kai's "Never Be Like You" (Mom&Pop/Red) inches up and is poised to join the Top 20 next week. Fifth Harmony's "All In My Head (Flex)" (Epic) moves Top 25 and Rihanna's "Needed Me" (WestburyRoad/RocNation) joins the Top 30. Jordan Fisher's "All About Us" (Hollywood) looks to be headed Top 30 soon. And finally, Ariana Grande's "Into You" joins the chart this week, one week after impact.