IBM (NYSE: IBM) has agreed to acquire Green Hat, a provider of software quality and testing solutions for the cloud and other environments. No financial terms were disclosed. www.ibm.com
W.M. Barr has acquired Microban, a Huntersville, N.C.–based maker of branded antimicrobial ingredients, from The Valence Group, a portfolio company of TA Associates. No financial terms were disclosed. www.wmbarr.com
Henry Schein Inc. (Nasdaq: HSIC) has acquired all of Oak Hill Capital Partners’ remaining interests in Butler Schein Animal Health for $155 million in cash, giving it a total ownership position of 71.5%. In early 2010, Henry Shein merged its U.S. animal health business with Butler Animal Health Supply, a portfolio company of Oak Hill Capital Partners and The Ashkin Family Group. www.henryschein.com