Why is Onto Innovation stock surging today?

Recent market activity shows divergent trends for three distinct companies. Onto Innovation stock is currently surging, reflecting strong positive momentum. Conversely, Allied Properties REIT stock is sliding, indicating a downward trend in its current valuation. Meanwhile, Stepstone stock is climbing, showing an upward trajectory in trading. These movements highlight varying performance levels across the technology, real estate, and investment sectors as investors react to specific catalysts affecting each of these individual corporate entities today.