COB hit a 52-week high intraday and closed up almost 3% today as it announced a significant mineral resource upgrade for its Thackaringa cobalt project in New South Wales.
However fellow Australian junior Collerina Cobalt (AU:CLL) closed down more than 7% today, or 1c, after releasing its interim results on Friday.
In China, Nanjing Hanrui Cobalt (CH:300618) was down 2.54% in morning trade but remains up more than 30% year-to-date.
In Canada, First Cobalt (CN:FCC), which describes itself as "a leading non-DRC cobalt company", closed 2.63% lower on Friday.
The company had last week announced its latest M&A plans, a friendly acquisition of US Cobalt (CN:USCO), which closed up 0.78% on Friday representing a gain of 116.67% year-to-date.
Canada Cobalt Works (CN:CCW), previously Castle Silver Resources, was up 8.33% on Friday as it assayed 2.46% cobalt and 6,173g/t silver in underground bulk sampling at its Castle project in Ontario; and advanced its proprietary Re-2OX processing.
Finally, cobalt royalty and streaming company Cobalt 27 Capital, which completed a C$200 million (US$126 million) private placement 10 days ago, was up 1.97% on Friday with no news.