$4.6 million in a Series A financing from Ignition Partners and Frazier Technology Ventures. In 2006, Sigma Partners led Series A1 and Series B financings, becoming the largest shareholder, a position it held at the time of the IPO, with returns over $700 million. Between 2006 and 2009 DocuSign raised $30 million that allowed the firm to add corporate clients and process 48 million signatures. In July 2012, DocuSign raised $47.5 million in venture funding from investors including Kleiner Perkins Caufield & Byers; the round later grew closer to $56 million. In March 2014, the company announced it had raised $85 million in a new funding round. Though unconfirmed, The Wall Street Journal reported the round was based on a company valuation of $1.6 billion. In May 2015, the company announced it had raised $233 million in a new funding round, with some estimating a $3 billion company valuation. In 2018, the company announced plans for an initial public offering on the NASDAQ, with the goal of raising up to $543 million when the company goes public. Neither the original founders nor current CEO Daniel Springer were major shareholders at that time. Former CEO Keith Krach was the largest individual shareholder at 5.5%, about 8.5 million shares at the time of the IPO. Venture capital firms Sigma Partners, Ignition Partners, and now-defunct company Frazier Technology Ventures were the largest shareholders. Products and structure DocuSign's services are offered either by subscription or free of charge as a mobile device app. Signatures and documents are uploaded, then encrypted and a unique hash created. If a signed document is later changed, the hash will not match the information stored by DocuSign if a document has been tampered with or compromised. By 2018, more than 20 billion pieces of paper and 608,000 barrels of oil had been saved by the company through avoidance of wasted printouts for signatures. DocuSign Professional emails recipients an electronically signed document requesting review of a document after it is uploaded. Each party must agree to complete business electronically, review the document, and apply a signature. Signatures may be added from a stored copy of a signature or generated automatically by the software. Phone confirmation and background checks are offered as premium services. DocuSign released its mobile app DocuSign Ink in November 2011. It is available free of charge, and runs on Apple iOS, Google Android and Windows Phone operating