The parent company of body panel maker Stadco is to raise £57 million after announcing its intention to float on AIM.
Acertec, which produces engineered steel products for use in the automotive and construction markets, will be admitted to trading on AIM on May 16.
The placing of 38.5 million shares at 148p each will give the firm, which employs 950 people in the Midlands, a market capitalisation of £76 million.
The money raised from the float will pay for the partial exit of private equity house Candover, which backed the buyout of Hall Engineering Holdings in 1999, which led to formation of Acertec.
Acertec's Construction Products division (BRC) is the UK's largest supplier of engineered steel products used in concrete construction.
Stadco, its car body division, is the UK's largest supplier of body-in-white pressings and sub-assemblies to automotive original equipment manufacturers.
In the year ended December 31 Acertec, which has its head office in Solihull, achieved sales of £281 million and operating profit before goodwill and exceptionals from ongoing operations of £12.7 million.
John Sword, chief executive, said: "Acertec has received a strong reception from investors and we are delighted to be listing on AIM.
"Acertec's principal operating subsidiaries, BRC and Stadco, are very successful businesses and each has good growth prospects. We are excited about returning to the stock market and look forward to delivering on our plans for our new investors."