Silsden-based Ecology Building Society has seen its assets exceed £120 million.
The ethical savings and green mortgage provider said total assets had grown from £109.7 million since the end of December, building on last year's increase of 6.1 per cent.
The society said the growth – announced at the start of National Ethical Investment Week – had been driven by the popularity of its transparent savings accounts and an expanding mortgage book, and was further evidence of the strength of the sustainable investment sector.
Chief executive Paul Ellis said: "Our financial success is based on sticking to our core principles – thinking long-term, putting our members first and focusing on our social and environmental impact. And with the right people in place to guide our future growth, we can make even more of a difference.
“The potential for sustainable finance has never been greater, with 63 per cent of British investors wanting a sustainable and ethical option when choosing their savings and investments.”
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