Ambarella drops 4.7% after Barron's targets GoPro

• A week after arguing Alibaba (another former tech high-flyer that was already well off its highs) has more downside, Barron's has done the same for GoPro (down 5.6%), declaring growth is slowing and predicting competition (has been around for some time) will take a toll.
• As is its custom, Ambarella (NASDAQ:AMBA) is going in the same direction as GoPro. Shares are back below $70, and down 24% from where they traded before in-line FQ3 guidance was provided (along with an FQ2 beat) on Sep. 1.