Softbank UK Ventures, the pounds 310m venture capital fund launched last year, has hired hi-tech PR specialist Firefly.
The agency beat competition from three other agencies to clinch the six-figure fee account.
Firefly director Mark Mellor leads a team of three on the account, with a remit to target the investment, internet business and technology entrepreneur communities.
Mellor reports to Softbank MD David Sola, who joined last year after heading up UBS Warburg's European mergers and acquisitions business.
Sola said: 'Good investments are a function of a strong company strategy - and continue with communicating that story. Firefly will work to raise the profile of Softbank UK Ventures and that of our global network, as well as the companies we invest in in the UK.'