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* Nvidia–Arm (abandoned): Scrapped after U.S., UK, and EU enforcers argued Nvidia could use control of Arm’s neutral chip IP to disadvantage rival chipmakers and harm innovation.\[[reddit](https://www.reddit.com/r/MediaMergers/comments/1pcs8qf/to_better_assess_the_viability_of_netflixs_wbd/)\]
* Penguin Random House–Simon & Schuster (blocked): U.S. DOJ convinced a court the deal would give the combined publisher monopsony power over authors, reducing advances and competition to acquire manuscripts.\[[reddit](https://www.reddit.com/r/MediaMergers/comments/1pcs8qf/to_better_assess_the_viability_of_netflixs_wbd/)\]
* Illumina–Grail (blocked/unwound in EU): EU authorities found that letting Illumina, a dominant sequencing supplier, buy Grail would let it foreclose rival test developers in early cancer detection.\[[reddit](https://www.reddit.com/r/MediaMergers/comments/1pcs8qf/to_better_assess_the_viability_of_netflixs_wbd/)\]
* AT&T–Time Warner (approved): DOJ lost in court; the judge found insufficient proof that integrating content (HBO, Turner) with AT&T’s distribution would significantly raise rivals’ costs or consumer prices.\[[npr](https://www.npr.org/sections/thetwo-way/2017/11/20/565476244/justice-department-sues-to-block-at-ts-merger-with-time-warner)\]
* Tapestry–Capri (abandoned): U.S. lawsuit argued it would overly concentrate “accessible luxury” handbags (Coach/Kate Spade with Michael Kors/Versace), risking higher prices and less choice, so the parties walked away.\[[reddit](https://www.reddit.com/r/MediaMergers/comments/1pcs8qf/to_better_assess_the_viability_of_netflixs_wbd/)\]
* JetBlue–Spirit (blocked): A federal judge agreed with DOJ that removing Spirit as an ultra‑low‑cost competitor would reduce fare competition, leading to higher prices for budget travelers.\[[foxbusiness](https://www.foxbusiness.com/economy/mergers-were-blocked-challenged-biden-admin-2024)\]
* Amazon–iRobot (abandoned): Dropped after U.S. and EU scrutiny over Amazon potentially using smart‑home and retail power to disadvantage rival robot‑vacuum makers and entrench its ecosystem.\[[foxbusiness](https://www.foxbusiness.com/economy/ftc-see-many-mergers-acquisitions-blocked-during-biden-admin)\]
* Netflix–Warner Bros Discovery (pending): Now under DOJ review; concerns center on Netflix potentially cementing dominance in streaming, reducing content and talent competition, and raising rivals’ costs by controlling WBD’s library and HBO Max.[aljazeera+1](https://www.aljazeera.com/economy/2025/12/5/netflix-to-acquire-warner-bros-discovery-raising-antitrust-concerns)