Insider trading is the practice of trading a company's securities based on material, nonpublic information

Prediction markets have faced questions about insider trading

While prediction markets encourage bettors to use their knowledge of a situation to inform their trades, these platforms have faced questions about when this borders on insider trading. For instance, traders on Kalshi can bet on who Taylor Swift's bridesmaids will be—but some worry that it would be unfair for Taylor Swift herself to earn money on that specific bet.

A landmark hedge fund court case once reshaped high finance

Hedge fund traders tied to insider trading by probing prosecutors are relatively rare. When billionaire hedge fund legend Steve Cohen, founder of SAC Capital, pleaded guilty to trading on inside information, Wall Street trembled. The outcome of the case remains a cautionary tale for traders today.

Retail investors are individuals who trade stock for themselves

Institutional investors, on the other hand, are investing for someone else. There are big differences between the two, one being that institutional investors can be granted certain special treatment (like being able to purchase IPOs right away).

Shorting is a high-risk and expensive investment strategy that hedge funds specialize in

Most investors buy stocks with the expectation that those stocks will be worth more tomorrow than they are today. Short selling, known as “shorting,” a stock is the opposite: The investor is betting the stock will drop in value.

While day trading has risen in popularity in recent years, the SEC warns it is a speculative strategy that can cause big losses

A day trader is anyone who buys and sells a stock within the same trading day. They quickly move in and out of the market to try and profit. Some day traders are professionals, while others are retail investors.

Find out the difference between prediction markets, sports betting, and investing

As one expert put it, "investing is a long-term strategy to build wealth over time, speculation is an attempt to predict the future, and gambling is a game of luck."

An initial public offering or 'IPO' is the process of a private company becoming public by putting shares of the company on the stock market for purchase.

Bear raiding is a manipulative tactic to bring a stock price down—and part of why short selling can be controversial

Bear raids occur when short sellers use manipulative tactics—like spreading false rumors or coordinating trades—to artificially drive down a stock's price and profit from short positions. Although bear raids are an illegal form of market manipulation, they can spook investors, prompting large selloffs of shares and causing a company's value to plummet. As a result, investors may be hesitant to invest in the company in the future, creating a feedback loop of stock downturn.

Chapter 7 and Chapter 11 filings can impact common stockholders

Publicly traded companies don’t file for bankruptcy out of nowhere—there are typically warning signs in a stock’s performance, quarterly earnings calls, and US Securities and Exchange Commission filings.

Special-purpose acquisition companies let companies skirt the IPO process

A video explains how private companies have taken advantage of this loophole, why investing in these companies isn’t always a good idea, and how blank-check companies (as they’re commonly called) work.

Play a game that reveals if investors with a crystal ball make better trades

The "crystal ball" game reveals how well you would do trading stocks and bonds if you could see the front page of the Wall Street Journal one day in advance.

What is after-hours trading?

While both the New York Stock Exchange and the Nasdaq open at 9:30 am ET and close at 4 pm ET, some trading is allowed after that. After-hours trading was once only open to institutional investors and people with particularly high net worths. Now, with the advent of computers, anyone can trade stocks anywhere online, and those regulations have broadened.

Some private credit funds trade on the stock market

These funds, which trade at market prices, are called "public BDCs," which stands for "business development companies." For instance, the global alternative investment manager Ares Management Corp. has a public BDC.

40 key stock market terms, explained

Liquidity. Forex. Capitalization. Blue chip stocks. These are just a few pieces of stock market vocabulary most people who don't spend all day on a trading floor might not know. Thankfully, we found a fun infographic that makes it easier to learn what 40 key stock market terms mean and why each of them matters.

Private companies are often harder to value than public companies

That's partly because there isn't readily available stock information, and financial accounting is kept behind closed doors. Typically, determining the value of a private company involves, among other things, closely comparing the private company with its competitors.

Initial public offering (IPO) is the term for when a company goes public

When a company completes its IPO, it's no longer a privately owned organization. Anyone can invest in the company by buying its shares on the stock market—opening up ownership of the business to the general public.

In early 2021, GameStop's stock surge brought retail investing into the spotlight

Using platforms like Robinhood, everyday investors became a growing presence in financial markets during the Gamestop short squeeze, revealing the influence retail investors can have on the market.

A lot of what consultants do all day is intentionally kept a secret

Consulting firms also often keep their clients private to maximize the sectors they’re able to secure contracts for and avoid any perceived conflicts of interest.

Listen to the methods and strategy of the secretive S&P 500 selection committee

Stocks are added to the S&P 500 by a secret selection committee that meets regularly to assess which companies can remain in the index, which companies need to be added, and which companies no longer meet the criteria. The members of the committee used to be public, but S&P Global decided to keep its members confidential after companies sent packages, letters, and gifts to try to make it into the index.

Decoding sports-betting language

The world of sports gambling is filled with insider lingo: What's a "spread"? How about a "moneyline" or a "parlay"? This resource breaks down the jargon, helping you navigate the industry or, at least, giving you the keys to talk about it.

Palantir's services allow both companies and the government to analyze complex data

There's a common misconception that Palantir buys, sells, and shares data, but Palantir insists it isn't a data broker. Rather, Palantir is more like a data analytics company that allows corporations and government agencies to combine messy, large, and often hard to access datasets to gather insights.

What is pay transparency?

Generally speaking, pay transparency occurs when an employer provides compensation information. But that idea can take many different forms in different states with different pay transparency laws depending on what each specific law dictates. To learn about more pay transparency basics like the ones above, read this article.

Commodity traders are the most powerful people you've never heard of

Just beneath the surface of the global economy is a hidden layer of dealmakers for whom war, chaos, and sanctions can be a great business opportunity—they're called commodity traders. Their power partly stems from the fact that commodities are essentially the building blocks of the economy at large.

Spot markets are where commodities intended for relatively immediate delivery are traded

Spot markets are where physical securities are exchanged for cash. Also known as cash markets or physical markets, the trades are relatively immediate—both parties agree to an immediate transfer. Currencies and securities can also be traded on spot markets.

The shadow banking system is a group of intermediaries that operate outside of normal banking regulations

The nonbank financial intermediaries that make up the shadow banking system legally provide services that are similar to those of traditional commercial banks. Although the term isn't used as often as it once was, private credit firms are technically part of the shadow banking system, as are hedge funds, payday lenders, buy now, pay later companies, and more.

The 2008 financial system unraveled in a wave of speculation

Michael Lewis—author of the bestselling "The Big Short"—explains how a wave of speculation (among other factors) drove the 2008 collapse, from lenders issuing risky mortgages to Wall Street turning them into fragile securities. He also highlights the few outsiders who recognized the bubble and bet against it before the crash.

Hedge funds, the private investment firms that trade a wide swath of financial assets, make money by imposing steep fees on investors and from the fund's investment performance.

Warren Buffett's former professor Benjamin Graham is known as the 'father of value investing,' a strategy in which investors seek to buy stocks trading below their intrinsic worth.

The Nasdaq's 'Magnificent 7' companies are responsible for roughly 40% of the Nasdaq 100 index's gains, while the remaining 93 companies account for the other 60%.

Netflix profits when you're not watching, and its movies are designed that way—read a detail-rich critical essay exposing lesser-known Netflix takes

Art theft is the third-largest source of criminal revenues worldwide, thanks in part to the subjective nature of valuing a work of art.

Radioactive elements can introduce software errors because the ionizing radiation they produce can detach electrons from atoms, and computer code relies on the distribution of electrons.

Telehealth demand for GLP-1s for weight loss is booming as consumers seek easier access.

Long before Major League Baseball began allowing instant replay for balls and strikes, an umpire reluctantly used the technology to determine whether a hit was a home run, a move that inadvertently ushered in a new era for the sport.

In 2025, four executives from large tech companies were given positions in the US Army Reserves—including Palantir Chief Technology Officer Shyam Sankar, which reinforced Palantir's ties with the US military and its role as a leading defense partner.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

Watch how deep-sea mining equipment collects and processes polymetallic nodules—metal-rich, potato-shaped rocks—from the ocean floor and creates environmentally damaging plumes of sediments.

Explore what it's like inside a patient isolation unit, used in situations such as treating a patient or suspected patient with Ebola.

Some coin denominations have ridges etched on their sides, partly to prevent counterfeiting, in a practice called 'reeding.'

'Silent' fireworks have gained more interest in recent years as a quieter celebratory option.

Dirty lightning is a thunderstorm created from friction between rising and falling flows of ash and smoke during volcanic eruptions.

Up to a million Girl Scouts sell about 200 million cookie boxes every spring, generating $800 million, largely because refusing a child is frowned upon

In 2018, 26-year-old missionary John Allen Chau was killed by tribesmen after attempting to reach and evangelize on India's isolated North Sentinel Island

The first line of 'immortal' human cells, which can divide indefinitely and are used in scientific research, was nonconsensually taken from a Black woman.

Clever Hans was a 1900s horse that was believed to be able to solve math equations, tell time, and read and comprehend German, until a psychology student discovered how he got his answers.

Prince's sexually explicit 1984 track 'Darling Nikki' attracted the ire of the Parents Music Resource Center, an advocacy group that inspired the Parental Advisory sticker, even though the song ends with a Christian message.

According to the physics of black holes, our 4D reality may be a hologram—a projection of information coded on a 2D surface on the edge of the universe.

Abraham Lincoln was almost assassinated weeks before his inauguration as he traveled from Illinois to DC through Baltimore in 1861; it took two independent claims for Lincoln to be convinced the threat was real

Studies suggest when you sleep is as important as how much you get, and syncing with your circadian rhythms may lead to less fatigue and improved long-term health outcomes

Play the role of a student in a game where you try to navigate college and remain debt-free, selecting different income levels, high school experience, race, ethnicity, and more.