Salesforce.com Inc. (NYSE: CRM) is buying marketing-software startup Krux in a cash-and-stock deal estimated at about $700 million, the latest acquisition in a strategy to expand its products against growing competition from bigger rivals.

The deal will include $340 million in cash as well as Salesforce shares, according to a filing with the U.S. Securities and Exchange Commission. Krux sells cloud-based software with data tools that help marketers, media companies and agencies reach and engage with customers.

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