 Invisalign maker Align Technology Inc. ALGN, 3.91 announced Monday that it has entered into a 200 million accelerated stock repurchase ASR program with Goldman Sachs Co. LLC. The medical device companys stock, which fell 1.4 in premarket trading, has plunged 71.3 this year, to make it the SP 500s SPX, 2.46 worst year-to-date performer, while the SP 500 has lost 18.2. 