MIPS-9922 is a potent and selective PI3Kβ inhibitor with an IC 50 of 63 nM. MIPS-9922 inhibits PI3Kβ with >30-fold higher potency than PI3Kδ. MIPS-9922 blocks PI3K mediated activation of platelet glycoprotein αIIbβ3 activation and platelet adhesion in vitro. MIPS-9922 shows anti-platelet and anti-thrombotic activities.