Stocks making the biggest moves midday: Unusual Machines, Snowflake, Arm, Dollar Tree & more

International Business Machines – Shares rose about 3% after the company disclosed in a regulatory filing that it would invest more than $10 billion toward quantum computing over the next five years. Arm Holdings – The chipmaker jumped more than 15% after Mizuho lifted its price target to $360 from $290. The firm said it sees tailwinds from internal CPU ramps in 2027 and continued strength from customer CPUs. Norfolk Southern , Union Pacific – The railways tumbled around 4% after the Surface Transportation Board halted its review of a proposed $71.5 billion merger of the two companies. The agency said it needs more information before it moves forward with the application. Drone stocks — Shares gained across a slew of companies after The Wall Street Journal reported that President Donald Trump's administration is in talks to provide funding to some. Unusual Machines surged about 65%. AeroVironment jumped 18%. Red Cat Holdings gained 39%, while Kratos Defense & Security Solutions popped 14%. Snowflake — The cloud-based data platform provider soared 37%. Snowflake sees second-quarter adjusted operating margin coming in at 12.5% on product revenue of $1.415 billion to $1.420 billion. Analysts polled by StreetAccount were looking for 11.9% margin, with $1.37 billion in product revenue. Dollar Tree — The discount retailer surged 18% after the company raised its guidance for the full year, calling for adjusted earnings in a range of $6.70 to $7.10 per share. …