Analyst Upgrades: Lifelock Inc, Domino's Pizza, Inc., and Vantiv Inc

Analysts are weighing in on security firm Lifelock Inc (NYSE:LOCK), food chain Domino's Pizza, Inc. (NYSE:DPZ), and payment processor Vantiv Inc (NYSE:VNTV). Here's a quick roundup of today's bullish brokerage notes on LOCK, DPZ, and VNTV.

• LOCK ​has exploded out of the block, thanks to solid third-quarter revenue numbers, and news the company has reached a settlement with the Federal Trade Commission (FTC) regarding deceptive marketing practices. The shares are 37.5% higher at $13.30, and analysts are expecting further gains. For example, Wunderlich upgraded the stock to "buy" from "hold," and set a price target of $18 -- levels last seen in early January. Short sellers can't be happy about any of this. The nearly 14 million LOCK shares controlled by bears represents nearly three weeks of buying power, at normal daily volumes. As such, the stock could benefit from a short-squeeze situation. 

• DPZ is getting a lift from analysts this morning. Goldman Sachs added the stock to its "Americas Conviction Buy" list, while Barclays and Maxim upped their price targets to $117 and $125, respectively. Domino's Pizza, Inc. was last seen 0.1% higher at $109.72, with a year-over-year lead over 23%. Considering this technical strength, more bullish notes from the Street could be in store. Ten of the 13 analysts covering DPZ say it's only a "hold" or "sell." 

• Brokerage firms are weighing in on VNTV this morning, following the company's strong showing in the earnings booth. Pacific Crest, Barclays, and Cowen and Company all raised their price targets to $57 -- all-time-high territory -- although Topeka Capital cut its opinion to "hold" from "buy." Wall Street is still deciding how to respond to these mixed reviews, with Vantiv Inc hovering near breakeven at $50.92. Looking back, the shares have outperformed the S&P 500 Index (SPX) by more than 16 percentage points during the past three months, which has led to a major call bias in the options arena. This is evidenced by VNTV's Schaeffer's put/call open interest ratio (SOIR) of 0.19. Not only does this indicate call open interest quintuples put open interest among options expiring within three months, but it stands lower than 99% of all annual readings. In other words, short-term speculators are more call-skewed than normal.