LONDON — Worldpay Group, the British payments processing company, said on Tuesday that it had received separate preliminary approaches from its American rival Vantiv and from JPMorgan Chase about a potential takeover, sending its shares higher.

Payment processing has become an attractive sector as more payments move online and onto cellphones and other devices, fueling growth in financial technology, or fintech, companies as well as acquisitions by traditional payment processors.

A deal with Vantiv, if finalized, would expand the geographic footprint of the Cincinnati-based company, which provides payment and technology services to merchants and financial institutions in the United States. A JPMorgan Chase deal would bolster the processing power of the bank’s credit and debit cards business.

The potential offers follow an increase in deals in the sector in recent years.

In 2015, Visa paid 21.2 billion euros, or about $24 billion at current exchange rates, to acquire its former unit Visa Europe from an association of banks and other payment service providers in Europe. The transaction was intended to expand Visa’s international reach and allow the payment network to better compete with MasterCard, which had integrated its European operations.

Vantiv has made several acquisitions in the payments space.

It agreed in November 2016 to acquire the United States arm of Moneris Solutions Corporation, a Canadian provider of payment services to merchants, for $406.8 million and agreed in April to buy Paymetric, a provider of electronic payment technology, for an undisclosed amount.

The announcement on Tuesday sent shares of Worldpay more than 12 percent higher in midmorning trading in London. The company was worth more than 7 billion pounds, or about $9 billion, based on its market capitalization on Tuesday.

Worldpay said that a “further announcement would be made if appropriate” and that it had made the disclosure without the consent of Vantiv or JPMorgan. The statement came after media speculation that a takeover might be in the works.

Worldpay did not disclose a potential value for either transaction.

Under British takeover rules, Vantiv and JPMorgan have until Aug. 1 to make a formal offer. JPMorgan declined to comment, and Vantiv did not immediately respond to requests for comment.

Worldpay, based in London, provides payment processing for mobile, online and in-store transactions in 146 countries and is the largest payment processor in Britain, where it accounts for about 42 percent of all transactions.

The company said that it processed 35.8 million transactions daily, including sales at hairdressers, restaurants and pubs. In 2015, the company said it processed 13.1 billion transactions.

Worldpay was carved out of the Royal Bank of Scotland to become a stand-alone business in 2010 and was listed by its private equity owners in an initial public offering in 2015.

Worldpay has about 4,500 employees in 11 countries. It reported a pretax profit of £264.1 million in 2016.

Vantiv was spun out of Fifth Third Bancorp in 2009 and listed on the New York Stock Exchange in 2012. It processed about 25 billion transactions for merchants and financial institutions in 2016 and reported profit of $280.9 million in 2016. Vantiv employs about 3,500 people.