By Douglas MacMillan and Greg Bensinger 

Online-payments startup Stripe Inc. said it had raised new funding that values the five-year-old company at $5 billion from investors including Visa Inc. and venture-capital firm Kleiner Perkins Caufield & Byers.

Existing investors Sequoia Capital and American Express Co. also participated in the round, which a Stripe spokeswoman said raised less than $100 million.

Stripe is rapidly growing in value as it expands to more areas of commerce. In addition to helping thousands of businesses process payments on their own sites and apps, Stripe now facilitates transactions from social networks Facebook, Twitter and Pinterest through a "buy" button advertisers can place next to products for sale on those sites.

At $5 billion, Stripe is valued 40% higher than in December, when it raised $70 million at a valuation of $3.6 billion.

The San Francisco startup is among several companies trying to simplify how businesses accept payments through mobile devices. Forrester Research estimates that Americans will spend $90 billion through mobile devices in 2017. Stripe takes 2.9% of most transactions, plus a flat commission of 30 cents per charge.

Stripe has been using its funds to expand into new international markets and now serves customers in more than a dozen countries. Still, Stripe faces competition from PayPal Inc.'s Braintree unit, which powers payments for ride-sharing service Uber Technologies Inc. and lodging-sharing service Airbnb Inc., among others. Apple Inc.'s Apple Pay has also quickly become a popular payments choice for app developers.

But Stripe also handles payments for some apps, such as Instacart, that accept Apple Pay. The startup struck another deal last year to handle payments for Alipay, the service owned by China's Alibaba Group Holding Ltd. that counts more than 300 million users.

Square Inc., another prominent payments startup, recently filed confidentially to hold an initial public offering, a person familiar with the matter told The Wall Street Journal.

Before the new funding, Stripe had raised a total of $190 million from a range of investors including Andreessen Horowitz, Founders Fund, General Catalyst Partners, Redpoint Ventures and Sequoia.

Write to Douglas MacMillan at douglas.macmillan@wsj.com and Greg Bensinger at greg.bensinger@wsj.com

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