By Mike Esterl 

Monster Beverage Corp.'s shares surged to a record Friday after the energy drink maker reported strong overseas growth and investors bet on a further lift from Coca-Cola Co., which is preparing to take a minority stake.

Monster's share price was up 13% at $141.06 in afternoon Nasdaq trade, pushing its stock market capitalization above $23 billion. Earlier in the session, the stock hit a high of $143.90. Its price has doubled since last August, when Coke agreed to pay $2.15 billion to acquire a 16.7% stake as part of an asset swap and distribution pact.

Monster said late Thursday its fourth-quarter profit soared 65% to $125.3 million and sales rose 12% to $605.6 million from a year earlier, easily beating Wall Street expectations. It is the world's second-largest energy drink maker by revenue behind Austria's closely held Red Bull GmbH.

Corona, Calif.-based Monster and Coke expect their deal to close in the second quarter. Some investors think Coke could increase the minority stake as the world's largest beverage company looks to diversify amid slowing soda sales.

"Materially better results since the Coke deal was announced in August 2014 increases the likelihood of an outright acquisition of Monster by Coke, in our view," Mark Astrahan, a beverage analyst at Stifel Nicolaus, wrote in a research note.

Coke can't increase its stake in Monster beyond 25% under a four-year standstill agreement without negotiating a waiver. Coke declined to comment on any additional stake plans. It also has spent more than $2 billion to acquire a 16% stake in countertop coffee maker Keurig Green Mountain Inc. since last year.

Even if Coke doesn't increase its stake, investors expect Monster's international rollout to accelerate with the help of Coke's massive distribution network. Monster has the largest share of the U.S. energy drink market in volume terms but lags behind Red Bull overseas. Coke sells drinks in every country other than Cuba and North Korea.

Monster said fourth-quarter gross sales outside the U.S. rose 16% to $160.1 million from $137.9 million a year earlier. The company also reported it booked operating income of $13.8 million outside North America, compared with a loss of $4.4 million in the year-earlier quarter, boosted by its growing business in Europe and Japan.

It said Thursday it expects to start selling its namesake energy drink in India soon. Chief Executive Rodney Sacks also told investors last month that the company expects to begin operations in China "more quickly" with Coke's help, but didn't give a launch date.

Monster also is benefiting from improving economic conditions in the U.S., where rising wages and falling gasoline prices are putting more money in consumers' wallets. The company said its U.S. retail sales rose 11% in the four weeks ended Jan. 24, citing Nielsen store-scanner data, after sales growth slowed in 2014 before rebounding late in the year.

But energy drink companies face regulatory risks amid health concerns. In addition to caffeine and sugar, energy drinks contain exotic ingredients such as taurine and ginseng marketed as delivering extra kick.

Companies have faced heightened scrutiny in the U.S. since 2012, when New York state Attorney General Eric Schneiderman launched a probe into marketing and health claims and the Food and Drug Administration disclosed it was investigating unconfirmed reports linking energy drinks to more than a dozen deaths.

Monster and other energy drink companies say their products are safe and contain about half as much caffeine per ounce as a Starbucks coffee.

Write to Mike Esterl at mike.esterl@wsj.com

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