NTT, Recruit and Mitsui joined corporate backers including Google, Salesforce, Comcast and SAP in funding DocuSign, which has now received more than $310m altogether.

US-based e-signature platform developer DocuSign raised $115m on Monday from NTT Finance, the holding company for telecommunications company NTT, staffing firm Recruit and diversified conglomerate Mitsui.

In addition to providing the series E funds, the three Japan-based corporates will also begin using DocuSign’s e-signature technology, which allows users to sign legally-binding documents in the cloud in their businesses.

Mitsui will also offer DocuSign to their customers and affiliate businesses.

Existing investors including venture capital firms Kleiner Perkins Caufield & Byers…