Neogen Corp. /zigman2/quotes/204188940/composite NEOG -2.25% said Monday that it named John Adent as its chief executive officer, effective immediately. He replaces founder and former CEO James Herbert, who will remain with the company as executive chairman. The maker of products for food and animal safety said Adent was recently the CEO of Animal Health International. "I'm excited to have John accept the leadership position at our company," Herbert said. "He has a strong background in many of our business activities both domestically and internationally." The stock, which was still inactive in premarket trade, has run up 13.7% over the past three months, while the S&P 500 /zigman2/quotes/210599714/realtime SPX -0.08% has gained 4.7%.