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Markets, without the jargon

BriefZip is an English-language publication covering U.S. and South Korean markets, company earnings, and the economic forces behind them. We help U.S. readers follow Korean business news in context and understand the connections between the two markets.

What you will find here

  • US Today.zip: U.S. market and business briefings.
  • Korea Overnight.zip: Korean market developments explained for English-speaking readers.
  • Company earnings and explainers: The numbers, what changed, and why it matters.

Our editorial approach

Our aim is to use clear English, identify the reporting period and currency, and distinguish reported results from estimates and forecasts. U.S. dollar conversions, when provided, are approximate unless otherwise stated. Korean market events may occur on a different calendar date in the United States.

Corrections and contact

Found an error or have a question? Email jjeon.zip@gmail.com with the article title and the details you would like us to review.

Financial information, not personal advice

Content is provided for general information and education. It is not personalized investment, tax, or legal advice, and is not a recommendation to buy or sell a security. Market prices and company information can change.

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Marvell Agrees to Buy Lumentum in All-Stock Deal at $115 Billion Enterprise Value

Marvell Agrees to Buy Lumentum in All-Stock Deal at $115 Billion Enterprise Value
Marvell Technology agreed on Nov. 2 to acquire Lumentum in an all-stock deal valued at about $115 billion in enterprise value. No cash changes hands: Lumentum holders receive Marvell shares. The deal is expected to close in the first half of 2028. Why Marvell wants Lumentum Marvell designs chips that move electrical signals between processors and servers inside data centers, along with custom AI chips. Lumentum makes lasers, optical transceivers and optical circuit switches that send data as light. The companies said copper links are hitting speed and power limits as AI data centers grow, accelerating the shift to optical connections. Optical transceiver: a part that turns electrical signals into light for fiber links, and back again on the other end. The strategic point is that faster processors are useful only when the rest of the system can keep them supplied with data. Electrical chips, network equipment and optical components perform different jobs along that path. Marvell i...
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US Today.zip Nov 2: Oil Slides 7%, Dow Edges Up as Nasdaq Falls 1%

US Today.zip Nov 2: Oil Slides 7%, Dow Edges Up as Nasdaq Falls 1%
Wall Street split on Monday, Nov. 2. Crude oil fell more than 7% intraday on hopes for a US-Iran diplomatic breakthrough, while the Dow rose 0.41%, while the tech-heavy Nasdaq Composite slid 1.07%. Factory data came in strong, and two big corporate deals landed in the chip and cloud space. Stocks and oil The Dow closed at 51,983.98, up 213.67 points. The S&P 500 fell 0.51% to 7,541.40, and the Nasdaq dropped 272.68 points to 25,164.32. Market commentary described the day as a rotation out of technology stocks. The three benchmarks do not hold the same mix of companies. The Dow follows 30 large blue-chip businesses and is price-weighted, so a company's share price affects its influence. The Nasdaq Composite has a particularly large technology presence, while the S&P 500 covers a broader group of large US companies. A rise in the Dow alongside a decline in the other two is therefore not a contradiction: it shows that the day's gains and losses were distributed uneve...
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Korea Today.zip Nov 3: KOSPI Falls 3.59%, IPO Cornerstone Rules Set for Nov. 13

Korea Today.zip Nov 3: KOSPI Falls 3.59%, IPO Cornerstone Rules Set for Nov. 13
South Korean stocks had a rough Tuesday. The benchmark KOSPI fell 3.59% on Nov. 3, and the tech-heavy KOSDAQ dropped 4.08%. On the same day, the government finalized the details of a new rule that lets long-term institutional investors receive IPO shares in advance, Kia announced a plan to supply electric vans to a major Japanese taxi operator, and the navy launched a new 3,600-ton submarine built with 70 domestically made systems. Here is what happened and why it matters. Stocks: a broad sell-off The KOSPI, which tracks large companies listed on the Korea Exchange's main board, closed at 5,648.79, down 210.29 points. The KOSDAQ, Korea's smaller market dominated by technology and biotech growth companies, closed at 704.39, down 29.97 points or 4.08%. Both indexes stayed weak through the session. Market commentary pointed to the burden of heavy artificial intelligence investment and the funding needed to pay for it, even though international oil prices were lower. On Nov....
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Samsung Biologics Asks Union to Delay Wage Talks by 2 Weeks

Samsung Biologics Asks Union to Delay Wage Talks by 2 Weeks
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US Today.zip Nov 3: Chip Rebound Lifts Nasdaq as Apple Drags the Dow

US Today.zip Nov 3: Chip Rebound Lifts Nasdaq as Apple Drags the Dow
Wall Street split again on Tuesday, November 3, 2026, as Americans voted in the midterm elections. A rebound in chip stocks lifted the Nasdaq Composite 0.83% , while the Dow Jones Industrial Average slipped 0.38% as Apple fell. September job openings came in above expectations, Apple's record quarter was overshadowed by a softer margin outlook, and Palantir reported that revenue nearly doubled from a year earlier. This briefing walks through the market close, the jobs data and the two company reports, with the numbers explained and what to watch next. Stocks: chips bounce back on Election Day The Nasdaq Composite closed at 25,372.01, up 207.65 points. The S&P 500 gained 27.52 points, or 0.36%, to 7,568.92. The Dow fell 197.26 points, or 0.38%, to 51,786.72. Chip stocks had sold off hard the previous session, and many of them recovered on Tuesday. Because the Nasdaq Composite is heavily weighted toward technology companies, it tends to move most when semiconductors and so...
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Why AI Data Centers Are Sized in Megawatts

Why AI Data Centers Are Sized in Megawatts
When Samsung SDS announced on November 2, 2026 that it had started building an AI data center in Gumi, an industrial city in southeastern South Korea, the company gave both the site area and the power capacity. The initial power capacity is 60 megawatts , and the design allows expansion in stages to 120 megawatts. Here is why AI data centers are described in megawatts, and what that number really means. The Samsung SDS project Samsung SDS is the IT services company of the Samsung group. Its Gumi data center sits on roughly 46,000 square meters of land and is built for power-hungry AI and GPU servers. Construction began after the city approved it in late August, and completion is planned for the end of 2028. Besides running its own GPUs, the company will offer colocation, where customers bring their own servers or GPUs and rent space, power and cooling. Samsung SDS described the project as the first result of the Samsung group's plan, announced in July, to invest about 60 trilli...
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Korea Today.zip Nov 4: KOSPI Recovers From a 4% Intraday Drop as Coupang Posts a Loss

Korea Today.zip Nov 4: KOSPI Recovers From a 4% Intraday Drop as Coupang Posts a Loss
South Korea's stock market took buyers on a wild ride on Wednesday, November 4, 2026. The benchmark KOSPI index slid as much as about 4% during the session, then turned around in the afternoon to close 0.62% higher at 5,683.80. The same day, e-commerce company Coupang reported a third-quarter operating loss despite higher sales, Hyundai Motor Group showed a new building block for large hydrogen plants, and a consumer dispute panel ordered Mercedes-Benz Korea to compensate electric-car buyers who were misled about their batteries. This briefing walks through each story, explains the numbers and terms, and ends with what to watch next. Won amounts are converted at about 1,341.5 won per dollar, the Seoul market reference rate at 3:30 p.m. on November 4, unless another rate is noted. Stocks: a 400-point swing in one day The KOSPI, which tracks the stocks listed on the main board of the Korea Exchange, closed up 35.01 points, or 0.62%, at 5,683.80. The KOSDAQ, Korea's market ...
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