Each of those 100 firms will have one day of media and social activity dedicated to them in the 100 days leading up to 3 December.
The three PR firms are The London Fashion Agency (based in Brixton, London), Keystone Marketing (St Neots, Cambridgeshire) and Charma Communications (Bermondsey, London). Charma will be profiled first, on 12 September, The London Fashion Agency on 16 September and Keystone on 2 December.
Applications opened in June for businesses wanting to be on the list, which has been run by the non-profit group every year since it launched in the UK in 2013. For the fourth year, the firm Astute Marketeers is handling PR for Small Business Saturday.
The Small Biz 100 for 2016 includes a wide variety of firms. These include a family business called Mitchell’s, which is a grocery and tea room in Inverurie, Aberdeenshire, the food-sharing app Olio, Brighton-based retailer The Pet Shed and Scarborough-based digital agency Askew Brook.
Small Business Saturday originated in the US in 2010.
Below are examples of the publicity for two of last year's 100, the social and creative agency Shake Social, and PR firm Attica Communications: