Analyst Downgrades: Yelp Inc, Skyworks Solutions Inc, and Ambarella Inc

Analysts are weighing in on business review site Yelp Inc (NYSE:YELP), Apple Inc. (NASDAQ:AAPL) supplier Skyworks Solutions Inc (NASDAQ:SWKS), and GoPro Inc (NASDAQ:GPRO) supplier Ambarella Inc (NASDAQ:AMBA). Here's a quick roundup of today's bearish brokerage notes on YELP, SWKS, and AMBA.

• YELP is facing a 6.5% drop at the open, thanks to a downgrade to "sell" from "neutral" at B. Riley, which also set its price target at $15 -- in all-time-low territory. Yelp Inc has been slipping on the charts for nearly two years, giving up almost half of its value in 2015, and closed Wednesday at $22.07 -- not far off a two-year low of $20.50, touched in August. Of the 29 brokerages currently following YELP, 21 say it is a "hold" or worse. And traders appear to agree -- short interest on the stock accounts for 17% of its total available float, or more than six days' of trading, at YELP's average pace of trading.

• Barclays, Craig-Hallum, and BofA-Merrill Lynch all slashed their price targets on Apple supplier SWKS -- to $93, $100, and $85, respectively. Skyworks Solutions Inc hit a new yearly low of $61.90 on Wednesday, before closing at $62.16. The shares have been taking a beating lately, thanks to concerns about iPhone sales, and have shed nearly 20% of their value so far in 2016. Still, all 17 analysts providing coverage on SWKS call it a "buy" or better. And near-term option traders have taken a bullish spin, too. The security has a Schaeffer's put/call open interest ratio (SOIR) of 0.49 -- just 1 percentage point from an annual low. In other words, among options expiring in the next three months, traders have rarely been more call-heavy in the past year.

• After hitting an annual low of $40.22 on Monday, AMBA is down 8.3% in electronic trading, after partner GoPro slashed holiday sales guidance and announced job cuts. As a result, Pacific Crest and Morgan Stanley cut their price targets on AMBA to $72 and $56, respectively. Ambarella Inc has been following GPRO lower since August, and traders have been betting on more downside. More than 44% of the stock's available float is currently sold short -- which would take almost two full weeks of trading to buy back, at AMBA's average daily pace. But analysts haven't abandoned all hope yet -- eight out of 13 still rate the security a "strong buy." AMBA closed Wednesday at $44.59.