PRA Health Sciences pulled off its IPO on Thursday but at a lower price than expected.

After aiming to sell shares at between $20 and $23, PRA ended up selling at $18.

PRA is trading on the Nasdaq under the symbol PRAH.

It’s the second Triangle life science services firm to go public in a week. INC Research but public markets last Friday.

PRAH shares did show some pop, however, closing the first day trading at $19.62, up some 9 percent.

More than 6 million shares were traded.

According to website Renaissance Capital, PRA sold 17 million shares. One of its investors, KKR, decided not to sell 1.6 million shares, the website said.