Two stocks, Ambarella (AMBA) and Synchronoss Technologies (SNCR), rejoined Sector Leaders in Thursday’s edition. Synchronoss cleared a 48.54 cup-with-handle buy point in early April and rose 8% before getting knocked down by a series of bearish reversals. On the way down, it sliced its 50-day moving average and triggered a sell signal. By June 1, it had fallen as much as 13% below the entry.