Sustainable Growth Advisers (SGA) stated in its Q2 2026 investor letter that Arm Holdings plc (ARM) was a top contributor to its Global Growth Strategy portfolio, delivering 20% revenue growth and 12% profit growth. The firm views Arm as a high-quality, long-term compounder well-positioned to benefit from the proliferation of AI and power-efficient computing. However, SGA trimmed its position in Arm to a below-average weight due to valuation considerations following the stock's strong performance.