Key Highlights

  • Marvell (NASDAQ:MRVL) fell about 13% to USD 218.95 on October 29, 2026 after a media report of advanced talks to buy Lumentum, a deal that has not been announced. Lumentum (NASDAQ:LITE) shares rose between 2.5% and 5% depending on the timestamp.
  • DoorDash (NASDAQ:DASH) agreed to buy Instacart, formally Maplebear, for about USD 17 billion in cash and stock, announced on October 29, 2026. DoorDash shares rose about 5% to 5.6%, and closing is expected in late 2027 or the first half of 2028.
  • ADT (NYSE:ADT) jumped about 34% to roughly USD 9.93 on October 29, 2026 after Thrive Holdings offered USD 10 per share in cash, valuing the company at about USD 7.6 billion. The USD 0.07 gap, or 0.7%, is simple arithmetic.
  • A report dated October 29, 2026 says the US Justice Department opened an antitrust inquiry into the proposed USD 12.93 billion Hugging Face purchase by Nvidia (NASDAQ:NVDA). It rests on a single report, with no company or agency confirmation.

Marvell (NASDAQ:MRVL): Reported talks, not announced

A media report said on October 29, 2026 that Marvell (NASDAQ:MRVL) is in advanced talks to buy Lumentum, and that an announcement could come as soon as next week. This is a report and not a confirmed event: no company statement, filing or press release has been found, and the price, form of payment and timing are not known. Marvell shares fell about 13% to USD 218.95, while Lumentum rose by 2.5% to 5% in different quotes. The market Capitalization figures of just over USD 220 billion for Marvell and about USD 82.8 billion for Lumentum come from published market data. The relative size, about 37%, is simple arithmetic on those two figures. The share price of a buyer often declines when a large deal is reported, because investors worry that it will pay a premium, issue stock or add debt. If Marvell (NASDAQ:MRVL) paid with shares, current holders would be diluted, which means their stake becomes a smaller share of a larger company. The seller usually rises because buyers pay above the market price, which fits the Lumentum gain. Whether the reported deal makes strategic sense, for example by adding optical components to a chip business, was not confirmed here and is not stated.

DoorDash (NASDAQ:DASH): Announced deal, long closing

DoorDash (NASDAQ:DASH) announced on October 29, 2026 that it will buy Instacart for about USD 17 billion in cash and stock. The deal had been reported first on October 26. Published accounts agree on the headline value and on the expected closing, which is late 2027 or the first half of 2028. The company release and the filing exist, but their text was not opened for this article, so the price per share, the premium over Instacart's price, the cash and Stock Split and the financing are not stated. DoorDash rose about 5% to 5.6% on the news, while Instacart, which trades as Maplebear (NASDAQ:CART), fell about 1% to 2%. A closing date more than a year away usually signals a long regulatory review. DoorDash (NASDAQ:DASH) and Instacart are both large grocery and restaurant delivery platforms, so competition regulators may ask whether a combination reduces choice for shoppers and for retailers. The target price also matters: a stock deal ties the value paid to DoorDash's own share price, which may change before closing. A rising buyer share price is unusual for a deal of this size, because buyers often fall on announcement, but the market may be pricing in savings or growth, though the companies' own estimates were not retrieved.

ADT (NYSE:ADT): Cash offer and a narrow spread

ADT (NYSE:ADT) announced on October 29, 2026 that Thrive Holdings offered USD 10 per share in an all-cash transaction valuing the company at about USD 7.6 billion. The stock jumped about 34% to roughly USD 9.93. The existence of a company 8-K filing and proxy filings is confirmed, but their text could not be opened, so the terms stated here rest on one published account. The premium to the previous close, the closing timeline, the financing and any conditions are not verified, and none is stated. The jump of about 34% is itself a signal that the offer was well above the price before the announcement, though the exact premium was not retrieved. When an all-cash offer is announced, the target's stock usually trades slightly below the offer price. The difference, called the spread, compensates traders for waiting until the deal closes and for the risk that it fails. Here ADT (NYSE:ADT) at roughly USD 9.93 against USD 10 leaves about USD 0.07, or 0.7%, per share, which is simple arithmetic on two published numbers.

Nvidia (NASDAQ:NVDA): Reported probe, one report

A single report on October 29, 2026 said the US Justice Department is examining Nvidia's (NASDAQ:NVDA) proposed USD 12.93 billion purchase of Hugging Face, the private platform widely used to share AI models. No company statement or agency confirmation was found, and the deal itself could not be independently verified, so readers should treat both the transaction and the inquiry as reported, not confirmed. Antitrust agencies often examine deals that could affect competition in a fast-moving market, and a reported inquiry is an early step that may end in clearance, changes or a challenge. No filing was found in the data reviewed. Nothing here predicts the outcome. Hugging Face hosts models and tools that many developers use across different chip vendors. Regulators may ask whether a chip leader owning that hub could favor its own hardware or limit rivals' access, which is the kind of vertical-integration question Merger reviews weigh. For Nvidia (NASDAQ:NVDA), the deal would extend its reach from processors into software and developer distribution, which is why a probe could slow the AI ecosystem strategy, according to the report's framing.

Where Things Stand

The answer is that deal headlines are moving stocks in different directions, and only two of the four are announced. DoorDash (NASDAQ:DASH) and ADT are announced transactions, though DoorDash's per-share terms and ADT's premium were not confirmed. The Marvell (NASDAQ:MRVL) and Nvidia items are reported, not confirmed, so a denial, a filing or silence could each move the shares. The next catalysts are the DoorDash and ADT filings, any Marvell (NASDAQ:MRVL) announcement said to be possible as soon as next week and any Nvidia statement. This is not Investment advice.