InterBulk, an expert at moving liquid and dry bulk materials, saw executive director Bill Thomson spend £33,000 to raise his stake in the firm.
Thomson bought 950,000 at 3.5p each to raise his holdings to 5.4m shares, which represents 1.78% of the company.
Non-executive director Graeme Bissett saw his stake rise by 400,000 after shares were bought at 3.65p each, while finance director Scott Cunningham acquired 250,000 shares at 3.50p.
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