Many smaller companies managers have been shifting into micro caps in the first half of 2018, including Aberforth Smaller Companies, BlackRock Smaller Companies and JPMorgan Smaller Companies - all of which increased their weightings significantly in late 2014 too, before a strong run for this area of the market. Against this backdrop, we examine the case for micro-caps and highlight a number of trusts focused on the area, and a number which have high allocations to this segment. Micro cap stocks have shown high growth potential in the past, offer diversification benefits to a balanced portfolio and since the Great Financial Crisis (GFC) have been cheaper than the larger small caps. However, there are significant risks involved, and greater flexibility allows the manager a degree of leeway to manage them.