US-based digital transaction technology provider DocuSign increased its series F round to $278m yesterday after securing $45m from computer manufacturer Dell and semiconductor producer Intel’s corporate venturing arm, Intel Capital.

DocuSign raised the initial $233m tranche earlier this month, and is looking to secure a total of $310m for the round according to a regulatory filing. It has now secured more than $500m in funding altogether.

Brookside Capital and Bain Capital Ventures, the venture capital unit of private equity firm Bain Capital, co-led the first tranche, which also featured Generation Investment Management and ClearBridge Investments. DocuSign did not disclose whether any existing investors took part.

Founded in 2003, DocuSign’s technology enables companies to sign contracts and agreements electronically. Its customer base extends to more than 100,000 companies, or 50 million individual users.

DocuSign raised $115m in an October 2014 series E round featuring Samsung Ventures, the investment arm of electronics producer Samsung, BBVA Ventures, the VC unit of bank BBVA, NTT Finance, a subsidiary of mobile network NTT, conglomerate Mitsui and human resources company Recruit.

The series E round also included by EDBI, the investment vehicle of the Singapore Economic Development Board; Sapphire Ventures, the VC firm backed by software producer SAP; and fellow VC firms Kleiner Perkins Caufield & Byers, Accel Partners, Scale Venture Partners and Ignition Partners.

DocuSign’s other backers include internet company Google, payment services provider Visa, telecommunications company Telstra, cable and internet service provider Comcast, software producer Salesforce.com, Sigma Partners, Wasatch Advisors, National Association of Realtors, Cross Creek Advisors, Sands Capital Ventures, Wellington Management and Frazier Technology Ventures.