ASOS (LON:ASC), the online clothes retailer, which has been key to AIM’s performance in the past five years, gained about 5% this past week amid analyst upgrades.
On Friday, meanwhile, the bears were all over Bagir Group (LON:BAGR) like a bad suit, after the company’s third profit warning since its April AIM float. Down 31% to 3.75p, the share price is now a very long way away from the springtime IPO price of 56p.
Marketing group BrainJuicer (LON:BJU) was another notable faller, down about 8% on Thursday, as it warned of “little revenue visibility and plenty of volatility” across its business.
Chinese electric scooter maker Vmoto (LON:VMT) was down sharply after issuing a profit warning and the sale of a previously acquired business unit which had not delivered as much as expected.
Philately and collectables specialist Stanley Gibbons (LON:SGI) cautioned that it may miss first-half targets, but said second-half trading should allow it to achieve full year forecasts.
Europe's only listed drone services firm, Strat Aero (LON:AERO), urged shareholders to be "patient" as it waits for further investment to grow its unmanned aerial vehicle business.
Cyber security firm Falanx (LON:FLX) was on the rise after announcing new deals with three unnamed financial services companies, as well as five contracts for its corporate intelligence unit.
Bio-tech juniors ANGLE (LON:AGL) was boosted as its Parsortix system for harvesting circulating tumour cells received endorsement from researchers at the Barts Cancer Institute (BCI) in London.
Elsewhere, Sphere Medical (LON:SPHR) gained as it began talks with potential partners for a roll out of its breakthrough Proxima blood monitoring device.
Trinidad focussed Range Resources (LON:RRL) advanced on Thursday after telling investors it was on-track to hit a previously announced production target by the end of the year.
North Sea tiddler Independent Oil & Gas (LON:IOG), meanwhile, gained about a quarter as it revealed significant progress towards drilling the planned Skipper well by securing commitments amounting to around £7mln for the project.
Miner Arian Silver (LON:AGQ) was a notable mover – once its suspension was lifted – as it moved closer to securing its finances, signing a letter of intent to extend a convertible loan.
Anglo Asian Mining (LON:AAZ) was up as it revealed improving financials thanks to robust gold production from the Gedabek mine in Azerbaijan.