Integrated Alarm Services, the US security alarm systems supplier, has increased the size of its planned initial public offering by 43% despite poor market conditions forcing six other US firms to withdraw their IPOs in 2003.

The firm has increased the size of its share sale from 10 million to 13 million shares, and boosted its indicative price range from between $9 and $11 to between $10 and $12, which would raise $156m (€145m) if it priced at the top of the range. The lead managers are Friedman, Billings, Ramsey and McGinn, Smith.