LONDON — Google is being sued for over £5 billion ($6.6 billion) in potential damages in the U.K. over allegations that the U.S. tech giant abused its “near-total dominance” in the online search market to drive up prices.

A class action lawsuit filed Wednesday in the U.K. Competition Appeal Tribunal claims that Google abused its position to restrict competing search engines and, in turn, bolster its dominant position in the market and make itself the only viable destination for online search advertising.

It is being brought by competition law academic Or Brook on behalf of hundreds of thousands of U.K.-based organizations that used Google’s search advertising services from Jan. 1, 2011, up until when the claim was filed. She is being represented by law firm Geradin Partners.

“Today, UK businesses and organisations, big or small, have almost no choice but to use Google ads to advertise their products and services,” Brook said in a statement Tuesday. “Regulators around the world have described Google as a monopoly and securing a spot on Google’s top pages is essential for visibility.

“Google has been leveraging its dominance in the general search and search advertising market to overcharge advertisers,” she added. “This class action is about holding Google accountable for its unlawful practices and seeking compensation on behalf of UK advertisers who have been overcharged.”

Google was not immediately available for comment when contacted by CNBC.

A 2020 market study from the Competition and Markets Authority (CMA) — the U.K.’s competition regulator — found that 90% of all revenue in the search advertising market was earned by Google.

The lawsuit claims that Google has taken a number of steps to restrict competition in search, including entering into deals with smartphone makers to pre-install Google Search and Chrome on Android devices and paying Apple billions to ensure Google is the default search engine on its Safari browser.

It also alleges Google ensures its search management tool Search Ads 360 offers better functionality and more features with its own advertising products than that of competitors.

This week, an antitrust lawsuit brought by the Federal Trade Commission against Meta officially entered the courtroom in a landmark trial that could ultimately force the social media giant to sell its Instagram and WhatsApp platforms.

In January, the U.K.’s CMA raised concerns over competition issues in the cloud computing market, recommending an investigation into Amazon and Microsoft under a landmark competition law known as the Digital Markets, Competition and Consumers Act.

That came after a class action lawsuit filed in December 2024 accused Microsoft of unfairly overcharging customers of rival cloud companies. The claimant in the case, competition lawyer Maria Luisa Stasi, is seeking more than £1 billion in compensation for firms affected.

Dutch semiconductor equipment firm ASML on Wednesday missed on net bookings expectations, suggesting a potential slowdown in demand for its critical chipmaking machines.

ASML reported net bookings of 3.94 billion euros ($4.47 billion) for the first three months of 2025, versus a Reuters reported forecast of 4.89 billion euros.

Here’s how ASML did versus LSEG consensus estimates for the first quarter:

• Net sales: 7.74 billion, against 7.8 billion euros expected
• Net profit: 2.36 billion, versus 2.3 billion euros expected

In comments accompanying the results, ASML CEO Christophe Fouquet said that the demand outlook “remains strong” with artificial intelligence staying as a key driver. However, he added that “uncertainty with some of our customers” could take the company into the lower end of its full-year revenue guidance.

ASML is estimating 2025 revenue of between of 30 billion euros to 35 billion euros.

Fouquet said that tariffs are “creating a new uncertainty” both on a macroeconomic level and with respect to “our potential market demands.”

“So this is a dynamic I think we have to watch very carefully,” Fouquet said. “Now this being said, where we are today, we still see basically our revenue range for 2025 being between basically €30 and €35 billion.”

Global chip stocks have been fragile over the last two weeks amid worries about how U.S. President Donald Trump’s tariff plans will affect the semiconductor supply chain.

Last week, the U.S. administration announced smartphones, computers and semiconductors would be temporarily exempted from his so-called “reciprocal” duties on counterparties. But on Sunday, Trump and his top trade officials created confusion with comments that there would be no tariff “exception” for the electronics industry, and that these goods were instead moving to a different “bucket.”

On Tuesday, a federal government notice announced that the U.S. Commerce Department was conducting a national security investigation into imports of semiconductor technology and related downstream products. The probe will examine whether additional trade measures, including tariffs, are “necessary to protect national security.”

Nvidia said on Tuesday that it will take a quarterly charge of about $5.5 billion tied to exporting H20 graphics processing units to China and other destinations. The stock slid more than 6% in extended trading.

On April 9, the U.S. government told Nvidia it would require a license to export the chips to China and a handful of other countries, the company said in a filing.

The disclosure is the strongest sign so far that Nvidia’s historic growth could be slowed by increased export restrictions on its chips, which the U.S. government says can be used to create supercomputers for military uses. Nvidia reports fiscal first-quarter results on May 28.

During President Biden’s administration, the U.S. restricted AI chip exports in 2022 and then updated the rules the following year to prevent the sale of more advanced AI processors. The H20 is an AI chip for China that was designed to comply with U.S. export restrictions. It generated an estimated $12 billion to $15 billion in revenue in 2024.

Nvidia CEO Jensen Huang said on the company’s last quarterly earnings call in February that revenue from China had dropped to half of pre-export control levels. Huang warned that competition in China is growing, and for the second straight year, Nvidia listed Huawei as a competitor in its annual filing.

China is Nvidia’s fourth-largest region by sales, after the U.S., Singapore, and Taiwan, according to the company’s annual report. More than half of its sales went to U.S. companies in its fiscal year that ended in January.

Nvidia’s H20 chip is comparable to the H100 and H200 AI chips used in the U.S. and other countries, but it has slower interconnection speeds and bandwidth. It’s based on a previous generation of AI architecture called Hopper introduced in 2022. Nvidia is now focusing on selling its current generation of AI chips, called Blackwell.

DeepSeek, the Chinese company whose competitive AI model R1 unveiled earlier this year upended markets, used H20 chips in its research.

In addition to the existing Chinese export controls, Nvidia also faces new restrictions on what it can export starting next month, under “AI diffusion rules” first proposed by the Biden administration.

Nvidia has argued that further controls on its chips would stifle competition and potentially even erode U.S. competitiveness in technology. The company previously said it moved some of its operations, including testing and distribution, out of China after the 2022 export controls.

At the company’s annual conference last month, when asked about Chinese export controls, Huang said Nvidia works to comply with the law, but he also noted that about half of the world’s AI researchers are from China, and many of those work at U.S.-based AI labs. 

Nvidia said in Tuesday’s filing that the U.S. government told the company on Monday that the license requirement for H20 chips would be in effect “for the indefinite future.”

Nvidia shares have dropped 16% this year, largely due to President Trump’s announcement of widespread tariffs on top trading partners. While exemptions have been made on various electronics products, including smartphones, computers and semiconductors, Trump and some officials said over the weekend that the reprieve was temporary and part of plans to apply separate tariffs to the sector.

Shares of Advanced Micro Devices dropped more than 7% in after-hours trading on Tuesday following Nvidia’s disclosure. AI chipmaker Broadcom fell almost 4%.

WATCH: Nvidia says U.S. requires license to export H20 products to China