UK small caps finish 0.1 percent lower, while the FTSE AIM All Share Index is flat, compared to losses of 0.8 percent on the mid-caps and 0.6 percent on the blue chips.
AIM-listed ZincOx adds 23.7 percent, building on a 20 percent jump the previous session and continuing to take comfort from news that executive chairman Andrew Woollett and finance director Simon Hall have bought shares in the developer of Asia's largest zinc recycling project.
The share price jump has taken the relative strength indicator (RSI) on the stock from deeply oversold territory at around 18 at the start of the week up to heavily overbought levels around 91.
Also on AIM, Waterlogic adds 0.5 percent after agreeing to buy Cool Clear Water Group, thus opening the way into the Australian water cooler market.
"This acquisition provides yet another step change in growth for the company, and entry into a market which was largely untapped by Waterlogic," Gurpreet Gujral, analyst at N+1 Singer, writes in a note.
"Waterlogic are paying around 6.5 times EBITDA for CCW, which we think is a good price considering it has a recurring revenue stream and will be EBITDA margin accretive at the group level."
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