The £75m placing, which the infrastructure investment firm issued on 10 October, was “significantly oversubscribed”, prompting the board to cap it at £116m before costs and expenses.
Chairman Rupert Dorey said: "The success of our capital raise further reinforces the conviction we and our existing investors have in the robustness of our portfolio.”
INPP now plans to use the raised capital to repay £72.8m, drawn from the cash component of its corporate debt facility, as the firm prepares to invest £47m in the Dudgeon OFTO.
INPP said the extra capital it raised would go into pipeline opportunities, with committed investment obligations of approximately £200m.
Dorey added: “Our high-quality pipeline of harder-to-access opportunities combined with our active approach to asset management continues to support the generation of predictable, long-term and inflation-linked returns to our shareholders, as well as delivering value for money for all our stakeholders."