Talent Tech Labs, an innovation lab focused on talent acquisition technology, announced a new $1.8 million funding round on Wednesday led by Allegis Group, Mitchell Martin Inc. and Mercer. All three companies were existing investors.

“There is still much to accomplish, as it’s a sizable challenge to stay abreast with the pace of innovation happening in our field today,” said Brian Delle Donne, president of Talent Tech Labs. “We are most appreciative of the support and the confidence our backers have shown for our efforts. This funding will allow us to significantly expand from the core programs we’ve been delivering over the last few years.”

New York-based Talent Tech Labs researches talent acquisition technologies and has tracked more than 1,500 technology companies in the talent acquisition space since it was founded in 2012.

This new round brings Talent Tech Labs’ total funding to $4 million.

Staffing provider Mitchell Martin is the original founding member of Talent Tech Labs. Workforce solutions firm Allegis Group and Mercer joined as investors in 2015. Both Mitchell Martin and Allegis Group rank on Staffing Industry Analysts recently released list of largest US staffing firms.