The gene therapy developer Freeline Therapeutics Ltd has closed a $120 million extended Series C financing round in order to bring its lead programme for haemophilia B into a pivotal trial. Simultaneously on 30 June, it announced a possible initial public offering (IPO) of its shares in the US. The timing and the terms of such an offer have not been decided. Freeline’s majority shareholder is Syncona Ltd, formerly part of the Wellcome Trust.