STOCKHOLM, Aug 22 (Reuters) – Kinnevik welcomes Holtzbrinck Ventures as a rocket shareholder * Holtzbrinck Ventures (“HV”), is contributing its entire stakes in seven of Rocket’s most developed e-commerce businesses directly into Rocket, in exchange for equity in Rocket Internet AG. * Says HV receives a 2.5% stake in rocket * Says post-closing, Kinnevik will own an 18.1% interest in Rocket Internet.