The stomach-churning market scare continues. The Dow tumbled 546 points, or 2.1%, on Thursday following another rollercoaster session. The index briefly turned positive during morning trading before succumbing to heavy selling pressure. At one point the Dow was down 699 points. The Dow has shed 1,378 points over the past two days.

Let’s recall those heady days of 2006 when home prices were rising 10, 15, even 20 per cent a year, allowing millions of homeowners to refinance mortgages and collectively take out more than US$300 billion in cash from the increased value of their properties. Some spent the money on furniture, appliances, cars and vacations, adding fuel to an already roaring economy. Others reinvested it in the already booming real estate and stock markets.

Several of the market’s favorite semiconductor names are tanking on Monday as investors grow concerned over President Donald Trump’s plan to restrict foreign investments in U.S. technology companies. On Sunday the Wall Street Journal said the Treasury Department is drawing up rules to block companies with at least 25 percent Chinese ownership from buying companies involved in "industrially significant technology."

If people want to trade stocks every hundredth of a nanosecond, why not let them?

Amplification through investment in Robinhood. Mistakes were made, I should have done more research.

Herbalife Ltd says that it is facing an inquiry from the Federal Trade Commission. The nutrition and supplement company’s shares initially plunged more than 12% following a brief halt in trading pending the announcement.

Wall Street doesn’t like what it sees. Facebook’s stock price is dropping in after-hours trading after the company announced its purchase of virtual reality startup Oculus Rift. The stock, which closed up on the day, is now under its open price of $64.25, resulting in a loss of $1.5 – $1.8 billion market cap.

Today King went public, and immediately was given a raspberry by investors who sent its stock price down throughout the day, hammering the company to the tune of more than 15 percent and $1.1 billion in value. A good flotation this was not. In fact, it was the worst so far this year.

The shares fell slightly on Wednesday after the $99 device was introduced in New York to pretty much positive reviews, at least in terms of the product’s features. The box lets you watch videos and play games. On Thursday, the shares stumbled an additional $8.29, or 2.4% to $333.67. On Friday, the slump turned into more of a rout: The shares fell to as low as $315.61 before rallying back $321.74, down were down 3.7%.

Weekly Market Comment Archive - The Federal Reserve's Two Legged Stool

Modern Day snake oil salesmen

How to lose $195,000 in 10 days...

Money may not buy love, but it appears to buy years.Economist Barry Bosworth at the Brookings Institution crunched the numbers and found that the richer you are, the longer you’ll live. And it’s a gap that is widening, particularly among women.

Amazon.com was chipper late Thursday about its first-quarter earnings report. On Friday, Wall Street offered its view about the results and the outlook. It wasn’t pretty. Especially for founder and CEO Jeff Bezos. The shares fell 9.9% to $303.83, their lowest close since Oct. 9, when they finished at $298.23. The percentage loss was its largest since Jan. 31, when the shares fell 11% after revenue and profits missed forecasts.

“Even a return to median bull market valuations would be brutal for the most popular tech stocks. We’re not even talking about bear market valuations, and we’re making the leap of faith, contrary to the evidence, that the quality of current revenues is as high as those generated during the past decade. To illustrate the probable epilogue to the current bubble, we’ve calculated price targets for some of the glamour techs, based on current revenues per share, multiplied by the median price/revenue

It is alleged HFT enables professionals to make quick profits at the expense of savers and pension fund investors

There are some worrying features about global stock markets right now and just how mature the boom has become. Here are five reasons why you need to take care, writes Ian Verrender.

Yahoo’s stock, behaving as a proxy to Alibaba’s valuation, is down 5 percent today in midday regular trading, after the Alibaba’s updated F-1 filing indicated that its operating margins are declining.

Capcom announced today that is has not renewed the company's takeover defense, a countermeasure instated in 2008 to prevent Capcom from falling under another company's control should a third party buy up a large amount of its stock.

Deeb Salem, a 35-year-old star mortgage trader, was awarded $8.25 million for his 2010 bonus, but he told his mom he was expecting more.

The company's stock, which the folks at ZeroHedge first alerted us to, has gone from $0.10 on June 17 to $14.71 as of Wednesday's close. At its current stock price, the company's market cap is $4.29 billion. This is a gain of more than 24,000%. For some perspective, Apple, one of the most successful companies and stocks of the last generation, is up about 18,000% since it went public in 1980.

Steve Kroft reports on a new book from Michael Lewis that reveals how some high-speed traders work the stock market to their advantage

A day later, the aftershocks from Apple Inc.’s most important product launch in years are being felt across the technology world – instantly changing the fortunes of a myriad of Apple competitors, partners and the countless smaller companies that rely on the iPhone maker to survive.

The world’s biggest company isn’t big enough for Carl Icahn. That’s essentially the activist investor’s message to Apple Inc. (AAPL), which had a market capitalization of $603.6 billion at the close of trading yesterday. In a letter today to Apple Chief Executive Officer Tim Cook, Icahn made the case for why the Cupertino, California-based company should be trading at $203 a share, about twice the current price, which would boost its valuation to $1.2 trillion.

The benchmark Dow Jones Industrial Average dropped more than 300 points Thursday, continuing a three-day streak of triple-digit swings that has investors' heads spinning. Thursday's fall was the worst point loss in more than a year and the worst percentage loss since February. It was sparked by concerns over global economic growth after Germany reported that exports dropped 5.8 percent in August. It was the biggest decline in exports from Europe's largest economy since January 2009.

Tech stocks fell sharply on Friday, setting a somber mood for the industry this weekend. The carnage was widespread, with giants taking a stumble — Microsoft, -3.97%; Google, 2.92%; Facebook, -3.95%; LinkedIn, -3.84%; Yahoo, -3.65%; and Alibaba, -3.28% — and newcomers joining in the general mayhem. MobileIron fell 6.92%. ZenDesk was off 8.06%. GoPro dropped 4.63%, Twitter fell 8.84%, And Arista Networks shed 8.96%. (Data: Google Finance.)

Mark Cuban, the billionaire owner of the Dallas Mavericks, said he’s buying shares of Netflix Inc. because the online-streaming service will probably be acquired.

Apple Inc shares tumbled shortly after the start of trading on Monday, briefly suffering their largest price drop in at least three months on an unusual spike in volume. Selling accelerated just before 9:51 a.m. EST (1451 GMT), with more than 6.7 million shares trading in a one-minute stretch, the heaviest minute of trading in Apple since Oct. 29, according to Thomson Reuters data.

Now this is Greek tragedy. Greece’s Athex Composite GD, -12.78% tanked almost 13% Tuesday — the biggest drop for the index on record, according to FactSet. The renewed jitters came after the government, in a surprise move late Monday, said it would bring forward presidential elections to Dec. 17, potentially, setting the scene for snap elections in early 2015.

Rumors, on wall street, can be powerful. A whisper can turn into a current that moves markets, driving a stock price up or sending it tumbling. There may be only one other place where gossip holds such sway, and that is high school. Late last year, a rumor began circulating at Stuyvesant that a junior named Mohammed Islam had made a fortune in the stock market. Not a small fortune, either. Seventy-two million.

Fifteen years have passed since the Nasdaq index, which represents mainly technology stocks, was last near the 5,000 level. On Monday morning, it soared to 5001 for the first time since the dot-com bust.

Three experts spell out exactly where they have invested their pension.

A year after his best-selling exposé on high-speed trading hit stores, the author discusses its Wall Street furor.

Startups achieve astronomical valuations in exchange for protecting new investors

US high-speed trading firm Virtu renews efforts to make its public stock market debut, after delaying plans due to a controversial book.