US-based natural gas conversion company Siluria Technologies secured $20m in series B funding on 27th September from investors including UK-based foundation The Wellcome Trust, which led the round.

Wellcome was joined in the round by Presidio Ventures, the corporate venturing unit of Japan-based conglomerate Sumitomo, Altitude Life Science Ventures, the venture capital fund representing the private equity group GF, and venture capital (VC) firms Alloy Ventures, ARCH Venture Partners, Kleiner Perkins Caufield & Byers (KPCB) and Lux Capital, all of which participated in the round as existing investors.

The firms all contributed to a round of funding, in October 2010, when Siluria raised $13.3m. Siluria’s $1.8m seed round, in September 2007, featured participation from Cambrios Technologies Corporation, as well as KCPB, Alloy and Arch. The three VC firms also contributed to Siluria’s $3.3m series A round, in June 2009.

Siluria claims to have pioneered a profitable methane-based alternative for…

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