ASML, Siemens, and Proto Labs Dominate BULD’s Portfolio as U.S. and Eurozone Exposure Stays High BULD’s top holdings—ASML, Siemens, Proto Labs, Autodesk, and 3D Systems—make up nearly 38% of the portfolio. The ETF maintains significant exposure to the U.S. (56%) and Eurozone (26%), with a strong technology sector focus (74%), reflecting its commitment to robotics and 3D printing innovation.324