Diamondback Energy, Seagate Technology, Western Digital Upgraded

Analysts are weighing in on oil stock Diamondback Energy Inc (NASDAQ:FANG), as well as data storage specialists Seagate Technology PLC (NASDAQ:STX) and Western Digital Corp (NASDAQ:WDC). Here's a roundup of today's bullish brokerage notes on FANG, STX, and WDC.

Diamondback Energy Up On Price-Target Hike

FANG is up 1.8% at $104.30, after a price-target hike to $132 from $128 by Credit Suisse -- in all-time-high territory. FANG has been charting a series of higher lows for quite some time, and is up nearly 44% year-over-year, supported by its 80-day moving average. Option bulls may be cheering today's bump, with Diamondback Energy Inc's 50-day call/put volume ratio of 2.71 at the International Securities Exchange (ISE), Chicago Board Options Exchange (CBOE), and NASDAQ OMX PHLX (PHLX) sitting higher than 88% of all other readings from the last year.

Barclays Raises Price Target on Seagate Technology

STX is down 0.5% at $44.67, even after Barclays raised its price target to $49 from $46. The new target represents an annual high for the stock, which has already managed to gain nearly 143% since its mid-May lows, and recently broke through technical resistance in the $40-$41 area. Today's drop may have been in the cards for Seagate Technology PLC, which clocked in yesterday with a 14-day Relative Strength Index (RSI) of 77 -- well in "overbought" territory. It may also be related to the company's newly announced offering of senior unsecured notes

Western Digital Dips Despite Bullish Note

WDC is also down despite a price-target hike at Barclays, with the brokerage firm upping its target to $100 from $93, a new annual high. So far today, WDC is 0.6% lower at $78.75, but is up 125% from its mid-May lows. In the option pits, bullish traders have been setting their sights on Western Digital Corp. Its 10-day call/put volume ratio of 3.44 at the ISE, CBOE, and PHX sits just 9 percentage points from an annual peak.