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Twitter's stock is worth watching Thursday following the company's announcement that its chief operating officer has resigned his post. Also worth following is Amazon, which debuts a new music streaming service for its Prime customers. Here are five tech stocks that could be interesting today:

Twitter: Stock of the social media giant dipped in pre-market trading Thursday but is now rising as investors consider the company's announcement that its chief operating officer, Ali Rowghani, has resigned. Twitter says he'll stay on as a strategic adviser to CEO Dick Costolo. Rowghani joined Twitter in 2010 as chief financial officer, becoming COO two years later. Previously, he served as CFO at Pixar Animation Studios. Twitter, which did not give a reason for his departure, said it will not name a replacement and his responsibilities will be shifted to other executives.

Amazon. While the retail giant's shares are holding steady in pre-market trading Thursday, it will be interesting to see how investors react to its debut today of a new music streaming service for its Prime members. Called Prime Music, the service will offer at least a million tracks for ad-free streaming that can be downloaded to Kindle Fire tablets, computers and Apple and Android devices. It's likely to be integrated into an Amazon smartphone expected to be previewed next week.

GT Advanced Technologies. Reports of other new smartphones — notably the much anticipated iPhone 6 — appear to be lifting shares of GT, a manufacturing partner of Apple, at least 4% Thursday morning in pre-market trading. Macworld UK cited "recently published documents" that Apple and GT are aiming to open a new plant in Arizona this month. It says Apple CEO Tim Cook has confirmed that the plant aims to make sapphire glass, considered more durable than Gorilla Glass and possibly a better material for a bigger display.

Micron Technology. The semiconductor company's stock got a 5% boost Wednesday after Bank of America upgrading its rating from "underperform" to "buy," based partly on its dividend payment, sustainable upturn and perceived lower threat from Samsung. It also got another positive research call from Credit Suisse, which reiterated its "outperform" rating. Its stock rose just under 1% in pre-market trading Thursday.

Hewlett Packard. A day after demonstrating a potentially breakthrough computer project, HP's stock was upgraded from "sell" to "neutral" Thursday by Goldman Sachs and it rose more than 1% in pre-market trading. On Wednesday, HP Labs unveiled a new computer — known internally as The Machine — that was the highlight of a keynote speech by CEO Meg Whitman at the company's HP Discover customer conference in Las Vegas. If successful, the project could replace a giant data center worth of equipment with a refrigerator-sized computer.

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