With three major acquisitions under its belt this year, Miami, Florida-based Platform Specialty Chemicals has launched a $350 million initial public offering to cover its past purchases and fund further growth.

The ipo, for which a share price has not yet been announced, will follow a $300 million offering in May of this year and a $651 million offering in October.

The Miami chemical firm's purchases during 2014 include three agrochemicals business, including Belgium's Agriphar for $300 million, Ireland-based Arysta Life Science for $3.5 billion and Chemtura AgroSolutions, a subsidiary of US chemical producer Chemtura for $1 billion.