In a lawsuit, the D.O.J. said that more than 60 percent of debit transactions in the United States run on Visa’s network, allowing it to charge over $7 billion in fees each year for processing those transactions. Government lawyers argued that Visa penalizes its customers when they try to use competing services and that it has built a monopoly around payment processing.

1. Sept. 24, 2024

   The Justice Department accuses Visa of unfairly stifling competition in debit cards, claiming the company has maintained a monopoly by imposing or threatening to impose higher fees on merchants that also use other payment networks.

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The F.T.C. accused three big prescription drug middlemen, known as pharmacy benefits managers, of artificially raising prices for insulin drugs and making it harder for individuals to obtain cheaper options. The legal action targeted CVS Health’s Caremark, Cigna’s Express Scripts and UnitedHealth’s Optum Rx and subsidiaries they’ve created to handle drug negotiations. The three companies collectively control 80 percent of prescriptions in the United States.

1. Sept. 20, 2024

   The F.T.C. files an administrative complaint, which is not yet public, that seeks to prohibit pharmacy benefit managers from steering patients to drugs that make them more money.

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The F.T.C. sued to block Kroger’s $24.6 billion acquisiton of Albertsons, which, if allowed to proceed, would be the biggest supermarket merger in U.S. history. The companies said the merger would bolster their leverage with suppliers; the government contended that it would drive up prices for shoppers and suppress worker wages.

1. Sept. 17, 2024

   The hearing, a mini-trial, lasts just over three weeks. The judge in the case has yet to issue a decision.

2. Aug. 26, 2024

   The trial begins in Oregon, where both grocery companies have a significant presence. The case enters the spotlight as high food prices become a critical focus in the presidential race.

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3. Feb. 26, 2024

   The F.T.C. and eight states, plus the District of Columbia, sue to block Kroger from acquiring rival supermarket chain Albertsons. They say the deal would most likely result in higher prices for groceries and weakened bargaining power for unionized workers.

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The D.O.J. alleged Google harmed competition over the technology used to place advertising on web sites. The department and eight states said Google acquired rivals through anticompetitive mergers and bullied publishers and advertisers into using the company’s ad technology.

1. Sept. 9, 2024

   The trial is expected to take about a month. The government has asked for a breakup of the company, requiring Google to sell off some assets.

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2. Jan. 24, 2024

   The Justice Department and a group of eight states accuse Google of abusing a monopoly over the technology that powers online advertising.

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The D.O.J. and a group of states sued Google, saying its role in about 90 percent of all internet searches made it a monopoly. The lawsuit, which was filed in the final days of the Trump administration, alleged Google uses exclusive contracts with phone makers like Apple and other companies to feature Google search on their devices, making it harder for consumers to use rival search engines like Bing or DuckDuckGo.

1. Aug. 5, 2024

   In a 277-page ruling, a federal judge calls Google a monopolist and says it has acted illegally to maintain that monopoly. A trial to determine remedies is set to begin in 2025.

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2. Oct. 30, 2023

   The chief executive of Google’s parent company, Sundar Pichai, counters the government’s narrative in testimony that describes Google’s deals with other tech companies as having been in the best interest of consumers.

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3. Oct. 2, 2023

   As a trial begins, Satya Nadella, the chief executive of Microsoft, becomes the government’s highest-profile witness in the case when he testifies that even his company has found it difficult to compete with Google’s search products.

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4. Oct. 20, 2020

   The Justice Department accuses Google of maintaining its monopoly over search and search advertising, crowding out competition through exclusive business contracts.

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An F.T.C. lawsuit sought to block Tapestry’s $8.5 billion acquisition of Capri, a blockbuster fashion tie-up to bring together Coach, Kate Spade, Michael Kors and Versace. The suit was a rare move by the agency to block a fashion deal, given that the industry does not suffer from a lack of competition.

1. Sept. 9, 2024

   A hearing, which effectively serves as a mini-trial, begins over whether the government should put a halt to the deal while the F.T.C. can mount a case against the merger.

2. April 22, 2024

   The F.T.C. sues to block a merger of two fashion companies, Tapestry and Capri Holdings, that would bring together brands like Coach, Michael Kors and Kate Spade. The agency says the deal could force millions of consumers to pay more for “accessible luxury” accessories — less expensive goods sold by high-end firms — because the combined company would no longer have the incentive to compete on price.

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An antitrust lawsuit filed by the D.O.J. and several states against RealPage, a real estate software company, said its technology enabled landlords to collude to raise rents across the country. It was the first major civil antitrust lawsuit to centrally feature the role of an algorithm in pricing manipulation, D.O.J. officials said.

1. Aug. 23, 2024

   In its complaint, the Justice Department accuses RealPage of enabling a price-fixing conspiracy that artificially raised rents for millions of people.

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The D.O.J. accused Apple of using a monopoly in the smartphone market to stifle competition and inflate prices for consumers. In its suit, the department said Apple blocked companies from offering apps that competed with Apple versions, including Messages and Wallet.

1. Aug. 1, 2024

   Apple files a motion to dismiss the case, saying its business decisions didn’t violate antitrust laws. It has argued that those decisions make the iPhone a better experience.

2. March 21, 2024

   The Justice Department and 16 states, plus the District of Columbia, file a challenge to the reach and influence of Apple, arguing that the company has used anticompetitive tactics to keep customers reliant on their iPhones.

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Live Nation Entertainment, the concert giant that owns Ticketmaster, stands accused of illegally maintaining a monopoly in the live entertainment industry. The D.O.J. said Ticketmaster provided exclusive ticketing contracts with concert venues, which helped Live Nation shore up its dominance, depriving consumers of better prices and options.

1. May 23, 2024

   The Justice Department, joined by 29 states and the District of Columbia, accuses Live Nation of leveraging its sprawling empire to dominate the live music industry by locking venues into exclusive ticketing contracts, pressuring artists to use its services and threatening its rivals with financial retribution.

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A merger between JetBlue and Spirit, which would have created the fifth-largest airline in the United States, was blocked by a federal judge after a D.O.J. challenge. Government lawyers argued that smaller, low-cost airlines like Spirit helped reduce fares and that allowing the company to be acquired by JetBlue, which tends to charge higher prices than Spirit, would have hurt consumers.

1. March 4, 2024

   JetBlue and Spirit announce that they will not seek to overturn a court ruling that blocked their planned $3.8 billion merger.

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2. Jan. 16, 2024

   In a 109-page ruling siding with the government, the judge in the case says the merger would “likely incentivize JetBlue further to abandon its roots as a maverick, low-cost carrier.”

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3. March 7, 2023

   The Justice Department files a lawsuit seeking to stop JetBlue Airways from buying Spirit Airlines, arguing that the $3.8 billion deal would reduce competition.

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A lawsuit filed by the F.T.C. and 17 states against Amazon accused the retail behemoth of squeezing merchants and favoring its own competing brands and services over third-party sellers. A trial date is set for 2026.

1. Dec. 8, 2023

   Amazon asks the court to dismiss the suit, arguing that the F.T.C. failed to identify the harm consumers were experiencing. It says the agency confused “common retail practices” with monopolistic behavior.

2. Sept. 26, 2023

   The F.T.C. and 17 states sue Amazon, contending its online store and merchant services illegally stifle competition. The lawsuit that raises the possibility of altering the company’s structure.

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The F.T.C. sued to block Microsoft’s $69 billion acquisition of Activision Blizzard, which, if allowed to proceed, would be the largest consumer tech acquisition since AOL bought Time Warner more than two decades ago. The case follows scrutiny of the deal by regulators in Europe. Microsoft makes the consoles and platforms on which Activision’s games are played, and the merger of two companies that don’t directly compete is known as a vertical merger. Cases against vertical mergers have traditionally been difficult to win.

1. Oct. 13, 2023

   Microsoft says it has closed its deal with Activision Blizzard, signaling that the tech industry’s giants are still free to use their cash hoards to get even bigger.

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2. July 11, 2023

   In a 53-page decision, a judge says the F.T.C. has failed to show the merger would result in a substantial reduction in competition that would harm consumers.

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3. June 22, 2023

   The F.T.C. seeks a preliminary injunction to bar Microsoft from completing the deal before the F.T.C. has the chance to argue the case in its internal court. Microsoft argues a delay would essentially be killing the deal anyway.

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4. Dec. 8, 2022

   In its suit, the F.T.C. says Microsoft’s proposed acquisition of Activision Blizzard would harm consumers because Microsoft could use Activision’s blockbuster games like Call of Duty to lure gamers from rivals.

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The Justice Department sought to block a proposed merger between the largest publisher in the United States and a key rival.

1. Oct. 31, 2022

   In an order, a judge says that the government has demonstrated that the merger might “substantially” harm competition in the market for U.S. publishing rights to anticipated top-selling books.

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The D.O.J. sued to block UnitedHealth Group’s $13 billion acquisition of health technology company Change Healthcare, arguing that a deal would give UnitedHealth sensitive data that it could wield against its competitors in the insurance business.

1. Sept. 22, 2022

   After a trial over the summer, a judge says in a 58-page memo that UnitedHealth’s incentives to protect customer data as it grows its businesses outweigh motivations to misuse the information.

2. Feb. 24, 2022

   In a lawsuit, the Justice Department argues UnitedHealth Group’s deal to acquire Change Healthcare, a health technology company, would give the giant insurer access to sensitive data that it could wield against its competitors.

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