Outside of this top-10, however, are a number of more obscure high-growth plays listed further down the market cap spectrum.Here are five of these:
Travis Perkins
The Northampton-based builders merchant and home-improvement retailer is one of Mundy’s highest-conviction bets, sitting just outside his top-10.
It is the largest supplier of building materials in the UK and is more than 200 years old.
Travis Perkins products include general building materials, full kitchens and bathrooms, and power tools and landscaping materials. It also has the largest number of tool-hire outlets in the country.
It is currently trading on a price to earnings (P/E) ratio of 13.8 and is yielding 2.2 per cent, broadly in line with the last three years.
Over the last 10 years, it has underperformed both the FTSE 250 and the FTSE 250 Construction & Materials index. However, it has outperformed the latter over one, three and five years.
It has fallen behind the FTSE 250 over the past half-decade, but has beaten it over one and three years.
Performance of stock vs indices over 3yrs
Source: FE Analytics
The company has a market cap of £3.3bn. Five funds in the IMA universe hold the stock in their top-10.
Go-Ahead Group
This Newcastle-upon-Tyne international transport group operates bus and passenger rail services in the UK and school buses in the US. It makes up 1.02 per cent of the Special Sits fund.
It purchased London Central in 1994 during the privatisation of London buses.
It has operated a steady expansion policy throughout its history, moving south to London, diversifying into aviation through Gatwick airport and expanding its operations into the US through yellow school buses.
It has a market cap of £653.6m and is trading on a P/E ratio of 11.4, according to The Share Centre. It is yielding an attractive 5.4 per cent, which is slightly lower than in previous years.
Go-Ahead has made 287.78 per cent over the last decade and has continued to deliver positive returns over one, three and five years.
It has seen particularly strong gains in the extreme short-term, picking up 20.98 per cent over the last three months alone.
Only the Liontrust Income fund holds the stock in its top-10.
Games Workshop
This high-street retailer is best known for developing and distributing table-top war games such as Warhammer and The Lord of the Rings Strategy Battle Game.
It makes up 0.4 per cent of Mundy’s portfolio.
It has a market cap of £198.3m and is trading on a P/E ratio of 13.1. Its valuation has narrowed significantly since 2008 when it was trading on a P/E ratio of 123.2.
The company is yielding 7.2 per cent, in line with its payout over the last three years.
Games Workshop has massively outperformed the FTSE Small Cap index over one, three and five years, returning 319.56 per cent over the past half-decade, while the index has gained 43.53 per cent.
Performance of stock vs index over 5yrs
Source: FE Analytics
However, it has had a bumpy ride over the short-term, losing 0.92 per cent over the last six months.
Only one fund holds Games Workshop in its top-10.
Helical Bar
Mundy is also exposed to the out-of-favour property sector through the Mayfair-based Helical Bar.
The firm's core property holdings consist of in-town retail developments, industrial sites and a single London office.
It is trading on a P/E ratio of 35, but this is expected to come down significantly over the next two years, according to The Share Centre. It is currently yielding 2.3 per cent.
Helical Bar has made 137.97 per cent over the last 10 years, compared with 201.17 per cent from the FTSE Small Cap index.
It has had a fairly volatile ride, losing money over both three and five years, but surging ahead of the index over 12 months.
It has a market cap of £274.3m.
The stock is a top-10 holding in Mundy’s Investec Global Special Situations portfolio. One other IMA fund holds Helical Bar in its top-10.
Invensys
The British engineering and information technology company makes up a fairly small portion of the Special Sits portfolio.
Invensys has three main divisions – an industrial automation unit, a supplier of control devices and a railway control equipment and software branch.
It has made 270.22 per cent over the last decade and has continued to deliver strong returns over one, three and five years, picking up 79.4 per cent in the past 12 months alone.
It is trading on a P/E ratio of 19.9 and is yielding 1.4 per cent.
Eighteen funds in the IMA universe hold Invensys in their top-10, including Schroder UK Alpha Plus and Franklin UK Mid Cap.