A federal judge ruled that Google unlawfully monopolized parts of the online advertising technology market.

A federal judge in the USA ruled that Google constitutes an illegal monopoly in certain online advertising technology markets, which represents a significant blow to a key Business of the company. U.S. District Judge Leonie Brinkema ruled on Thursday that the Alphabet subsidiary violated antitrust laws in the advertising exchange platform and in the tools used by websites to sell advertising space (i.e., Server) markets. However, she also pointed out that in another market, where advertisers use tools to purchase display ads, Google does not meet the definition of a monopoly. As a result of this ruling, Alphabet's stock price quickly fell, at one point dropping by 3.2%, while Trade Desk's stock price surged by nearly 8%. This marks another significant setback for Google. Previously, in another case, the court had already determined that Google monopolized the online search market.