(Reuters) - Salesforce.com Inc CRM.N is in advanced discussions to acquire U.S. software maker MuleSoft Inc MULE.N, people familiar with the matter told Reuters on Tuesday, as it looks to expand its offerings beyond customer relationship management software.

FILE PHOTO - The Salesforce logo is pictured on a building in San Francisco, California, U.S. October 12, 2016. REUTERS/Lily Jamali/File Photo

The acquisition, which the sources said could be worth more than $6 billion, would be Salesforce’s biggest ever deal, illustrating Chief Executive Marc Benioff’s push to supplement the company’s cloud-based portfolio with new technology.

A deal could be announced as soon as this week, the sources said, cautioning that negotiations had not been finalized and that an agreement was not certain.

The sources asked not to be identified because the negotiations are confidential. Salesforce and MuleSoft declined to comment.

MuleSoft shares jumped more than 20 percent to $39.88 after Reuters reported the talks, giving the company a market value of $5.3 billion. Salesforce shares were up 0.3 percent at $125.31.

Based in San Francisco, MuleSoft makes software that automatically integrates disparate data, devices and applications to help companies’ networks run faster. It could help Salesforce win business from customers which are not yet ready to transition their systems to the cloud.

Buying MuleSoft would help Salesforce build a larger enterprise apps ecosystem around its own products, Barclays Plc BARC.L analysts wrote in a research note, adding that MuleSoft could command a premium given its rapid growth and good fit.

Salesforce Ventures, the company’s venture capital arm, led a $128 million funding round in MuleSoft in 2015.

MuleSoft has more than 1,000 customers, including Coca-Cola Co KO.N, McDonald’s Corp MCD.N, Spotify and Unilever ULVR.L. It went public about a year ago.

Salesforce holds more than 18 percent of the global customer relationship management software market, followed by Oracle Corp ORCL.N with 9.4 percent, according to 2016 figures provided by research firm IDC.

Alphabet Inc's GOOGL.O Google acquired a competitor of MuleSoft called Apigee Corp in a $625 million deal in 2016.

Salesforce has benefited from companies switching to cloud-based services due to the lower costs and high level of scalability. Last month, it posted a quarterly profit that topped Wall Street targets, fueled by growth in its cloud-based sales and marketing software.