The European Commission's concerns suggest there could be regulatory hurdles that may delay or even prevent the acquisition from proceeding. This uncertainty is likely to have a negative impact on Amazon's stock in the short term as investors may perceive potential regulatory challenges as a risk to the company's growth strategy in the home robotics market.

As the target of the acquisition, iRobot is directly impacted by the European Commission's concerns. Any regulatory issues that prevent or delay the deal could negatively affect iRobot's stock price in the short term due to the uncertainty surrounding the company's acquisition and its implications for future growth and market strategy.

While the European Commission's concerns are specific to the Amazon-iRobot deal, they reflect broader regulatory scrutiny that could affect market sentiment in Europe. However, the direct impact on VGK is likely to be limited as the ETF is diversified across various European stocks and sectors, and the deal is just one of many factors influencing the European market.