Tesla Motors Inc Shares Moving Amid Elon Musk Tweet

Shares of

were trading up more than four percent in Thursday's pre-market session. Tesla CEO Elon Musk tweeted a teaser about a mysterious unveiling of what he called the "D" on October 9.

Following the tweet, Global Securities reiterated it "Build Position" sentiment for investors with a 12 to 18 month horizon. The firm also noted

stands to benefit from the announcement and the rumor that

invest in Tesla's gigafactory may be accurate. Shares of Mobileye were last up 2.6 percent, or $1.40, at $54.39 early in Thursday's session. However, Global Securities does not expect an Apple investment to be part of the October 9 announcement. Instead, the firm thinks it is more likely that Tesla will only show off the ability to operate the cars with the iPhone 6, i.e., open doors and turn the Model S on. About an hour after posting the tweet, Musk

, "I love the Internet. Comments had me literally ROFL. No, it wasn't intentional. Glad I didn't mention the other letter!"

Tesla opened up about 5 percent higher Thursday. It was last up 3.33 percent at $248.35. The stock is down 12 percent, or $35, over the past month, but up more than 60 percent year to date.