NEW YORK (TheStreet) -- Twitter (TWTR - Get Report)  shares are jumping by 1.82% to $17.33 in Tuesday's pre-market trading session, after CEO Jack Dorsey announced this morning that Leslie Berland, a former American Express Co. (AXP) executive, is the company's new chief marketing officer. 

Dorsey tweeted the news this morning saying, "Welcoming @leslieberland to Twitter! She will join as our CMO to help tell the stories of our iconic product!"

In response, Berland said, "Thanks Jack! Excited to join you and the amazing teams to bring to life the power, uniqueness and magic of Twitter!"

Berland, who was the EVP of global advertising, marketing and digital partnerships at American Express, will report directly to Dorsey, according to Re/code.net, which first reported on Sunday that the new hire announcement could come early this week. 

This action comes after Dorsey announced yesterday that four senior executives at Twitter were leaving the company. 

Separately, TheStreet Ratings currently has a Sell rating on the stock with a letter grade of D. 

This is driven by multiple weaknesses, which TheStreet believes should have a greater impact than any strengths, and could make it more difficult for investors to achieve positive results compared to most of the stocks we cover. Among the areas that are negative, one of the most important has been a generally disappointing historical performance in the stock itself.

Recently, TheStreet Ratings objectively rated this stock according to its "risk-adjusted" total return prospect over a 12-month investment horizon. Not based on the news in any given day, the rating may differ from Jim Cramer's view or that of this articles's author.

You can view the full analysis from the report here: TWTR 

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