SWISS investment fund New Pistoia Income has increased its stake in IndigoVision to more than 10%, cementing its position as the Scottish video surveillance systems specialist's largest investor.

IndigoVision has been run by former finance director Marcus Kneen since December 2011 after a messy split with former chief executive Oliver Vellacott.

The issuing of a profit warning last week led to the continuation of a decline in the share price that started in late June and has seen an 25.6% drop in the company's value.

Chairman Hamish Grossart said of New Pistoia Income: "They are a long term investor. They like what Marcus is doing."

Mr Kneen has met representatives of the low profile institutional investor.

A filing to the stock exchange yesterday revealed that New Pistoia Income had bought 80,000 more shares, at a cost of around £230,000, to take its holding to 782,500 shares.

It first declared a holding in IndigoVision in April and having steadily built up its position, it now owns shares with a paper value of around £2.3 million that account for 10.3% of the company.

New Pistoia Income is the largest investor in IndigoVision, ahead of Liontrust Asset Management.

Midlothian-based IndigoVision issued a profit warning at the end of last week as lower-margin cameras accounted for a greater proportion of its sales.

Mr Vellacott parted company with Indigovision in late 2011 after having three separate management buy-out proposals rejected by IndigoVision's board.

He later mounted then abandoned a bid to oust Mr Grossart as chairman.