By Shalini Ramachandran and Tess Stynes 

Netflix Inc. said it plans to complete an aggressive international expansion in two years and deliver "material global profits," as the streaming-video provider faces a slowdown in U.S. subscriber growth.

In the fourth quarter, Netflix added 1.9 million U.S. streaming subscribers, down from 2.3 million in the year-earlier period, bringing its total to 39.1 million. Overall, the company added 4.3 million streaming customers, exceeding its forecast of 4 million, as foreign markets grew faster than expected.

The results cheered investors, driving the company's shares up 16% in after-hours trading.

In a letter to shareholders Tuesday, Netflix said it plans to expand to 200 countries by 2017, up from its current 50, while staying profitable. Earlier, a top Netflix executive had told an investor conference that the streaming service would go global "within five years."

Netflix Chief Executive Reed Hastings said the company was encouraged by results in its first set of markets, including Canada and Nordic and Latin American countries, which have turned profitable as a group. "The ability to click and watch and binge episodes has really resonated with people," Mr. Hastings said in an interview. "It has made us realize this is very likely to work on a global basis."

Last fall, Netflix started offering its service in six European countries, including France and Germany. The company said it expects to add Australia and New Zealand later this quarter. Netflix is also exploring plans to enter China.

Mr. Hastings said the company will need to obtain a government license in China, which isn't guaranteed, and will be "very cautious" if and when it does enter that market.

In the fourth quarter, Netflix added 2.43 million subscribers outside the U.S., topping its expectations of 2.15 million and a significant jump from the 1.74 million international subscribers it added a year earlier. The company ended the quarter with 18.3 million international streaming customers.

Janney Capital Markets analyst Tony Wible said investors were pleased with the stronger global customer growth, pricing leverage and a "faster scaling of investments" abroad.

In the near term, though, the international operations will continue to weigh on profits, because of the costs of expanding to new countries and acquiring content. The international segment's loss widened to $79 million in the fourth quarter from $57 million a year earlier. The company expects lower full-year operating income for 2015 than for 2014, as a result of the global expansion.

In the shareholder letter, Netflix said the downshift in U.S. subscriber additions was a "natural progression" as it grows. Last quarter, Netflix had largely blamed a price increase over the summer for its slowdown in U.S. subscriber growth. In Tuesday's letter, the company said that after additional research, it believes the declines "would have largely taken place independent of the price change."

The company said it has flexibility in "how quickly we grow content and marketing spend" as subscriber growth slows, and said it can continue to expand the U.S. segment's operating profit margins.

Netflix said its original shows, including "House of Cards," "Orange is the New Black" and "Marco Polo," are among its "most efficient" programming, costing less money relative to their viewership than shows licensed from major studios. Netflix doesn't release viewership figures.

Netflix has been a disruptive force in the U.S. pay-TV world, luring customers away from cable and satellite TV providers. But the streaming service could face new competition itself as other companies enter the online-video market. Time Warner Inc.'s HBO this year will offer a standalone streaming service, while Dish Network Corp. is rolling out a $20-a-month online-TV package.

Addressing the Dish offering, dubbed Sling TV, Mr. Hastings said it has "very attractive pricing" but added, "I don't think it materially changes the desire to have Netflix." Previously, he has said he thinks consumers will sign up for both HBO and Netflix.

Netflix also said it plans to offer "The Interview," the Sony Pictures comedy about an attempted assassination of North Korean leader Kim Jong Un. Sony began distributing the movie through on-demand platforms after major theater chains decided not to release it following threats from hackers believed to be connected to Pyongyang.

Write to Shalini Ramachandran at shalini.ramachandran@wsj.com and Tess Stynes at tess.stynes@wsj.com

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