The firm was founded in 2008 and works for big names including Balfour Beatty, Skanska, Costain and Kier.
As well as labour supply it provides complementary project delivery services and specialist plant hire like suction excavators.
Latest results for the year to September 30 2020 show the firm made a pre-tax profit of £1.1m from a turnover of £22.9m.
Hercules CEO Brusk Korkmaz said: “We have built Hercules to become a leading labour supply business over the past 13 years and our digital first approach has helped us attract major construction businesses to our client portfolio.
“Our proven and rapid delivery track-record has led to our work with our long-standing partner, Balfour Beatty, on HS2; this is expected to significantly step-change our growth in the next 12 months and beyond.
“The demand for skilled labour is higher than ever before due to the multi-billion infrastructure commitments made by the UK government and we are experiencing unprecedented demand for our services.
“Therefore, having identified multiple exciting growth opportunities, and proven the fast-growth and profitable nature of our business model, we believe that this is the right time to pursue an AIM listing. We are excited at the prospect of welcoming investors to our growth journey.”