SMALL-CAP MOVERS: Nasdaq-bound Scancell catches the eye as AIM's headcount falls to 612 Proactive uses images sourced from ShutterstockScancell Holdings PLC (AIM:SCLP, OTC:SCNLF, FRA:SCP) saw its shares drop 27% this week, but the movement obscures the real story, which is a largely positive one for investors. Scancell shareholders keep 85.5% of the enlarged group, and the Scancell name stays over the door. AIM's shrinking poolAfter starting the month on the back foot, the AIM All-Share was in recovery mode, rising 1% over the week to 768.74. The number of companies on AIM has collapsed to just 612, down from a peak of 1,694 in 2007, according to research from UHY Hacker Young. The concern is that the pool of quality companies is thinning fast, with too few flotations to make up the numbers.