By the end of this lesson you understand what it means, in practical and regulatory terms, for a company to be publicly listed -- not just that "it can be bought," but what obligations the company takes on and what it gains in return.
\n"Being listed" means a company's shares are publicly traded on a stock exchange, at a price that updates continuously according to supply and demand. To reach that point, the company carries out an IPO -- an Initial Public Offering -- the process through which it sells part of its capital to outside investors for the first time.
\nGoing public isn't free for the company, either in money or in obligations. In exchange for accessing financing from thousands of potential investors, the company commits to publishing audited accounts periodically, disclosing material events that could affect its share price as soon as they occur, and submitting to the market regulator's oversight. This mandatory transparency is precisely what allows any investor -- not just a bank or a fund -- to analyze the company with reliable information.
\nGoing public isn't free either for those who already owned the company beforehand, like its founders: they typically dilute their ownership percentage, because now there are more shareholders splitting the same company. In exchange, they gain liquidity -- they can sell part of their stake -- and access to capital to grow without depending on a bank loan.
\nWhen Airbnb went public in 2020, it went from being a private company -- whose accounts only its private investors knew -- to being required to publish its quarterly results for anyone who wanted to check them, including any small investor with a brokerage account.
\nA company being listed means its shares are publicly traded on an exchange, following an IPO process. In exchange for accessing financing from many investors, the company takes on real, ongoing transparency obligations -- publishing audited accounts and disclosing material events -- overseen by the market regulator.
\nWhat obligation does a company take on when it starts trading publicly, beyond "being sellable on an exchange"?
\nWhy can an IPO dilute the founders' ownership percentage?
","sortOrder":3,"readingMinutes":4,"difficulty":"Básico"},"previous":{"id":3,"moduleId":2,"slug":"how-do-stock-exchanges-work","title":"How do stock exchanges work?","summary":"You understand what a stock exchange is, what role it plays as a regulated institution, and how a stock's price is determined within it.","bodyMarkdown":"## Objectives\n\nBy the end of this lesson you understand what a stock exchange is, what role it plays as a regulated institution, and how a stock's price is determined within it.\n\n## Content\n\nA stock exchange is an organized, regulated financial market specifically dedicated to trading shares of companies listed on it. \"Organized\" means it follows clear rules about how trades are executed; \"regulated\" means a supervisory body oversees that those rules are followed and that participants receive truthful information -- in Spain, that body is the Comisión Nacional del Mercado de Valores (CNMV).\n\nA very common misconception is thinking that the exchange \"sets\" a stock's price, as if it were a catalog with prices decided in advance. That's not how it works: the price continuously emerges from the meeting of buy orders and sell orders from all participants. If at a given moment more investors want to buy a stock at the current price than investors are willing to sell it, the price tends to rise; if the opposite happens, it tends to fall. The exchange simply organizes that meeting in an orderly and transparent way -- it doesn't decide the outcome.\n\nIt's important to distinguish two different moments in a stock's life on the exchange:\n\n- **Primary market**: when a company sells shares for the first time (its IPO, or a later capital increase) and receives the money directly from the buyers.\n- **Secondary market**: all subsequent trades, in which investors buy and sell shares among themselves. The company no longer receives that money directly -- ownership of part of it simply changes hands.\n\nThe vast majority of the trades you see reflected in a stock's price, day to day, happen in the secondary market, between investors -- not between an investor and the company.\n\n## Example\n\nThe Madrid Stock Exchange, the New York Stock Exchange (NYSE), and the Nasdaq are real examples of stock exchanges. Each organizes trading for the shares of the companies listed on it, with its own hours, admission rules, and trading systems -- but on all three, the underlying mechanism is the same: matching buy and sell orders to form a price.\n\n## Common mistakes\n\n- Thinking that the exchange sets a stock's price as if it were a catalog -- the price emerges from participants' buy and sell orders, not from a decision by the exchange.\n- Confusing buying a stock in the secondary market with giving money directly to the company -- you're almost always buying it from another investor, not from the issuing company.\n\n## Summary\n\nA stock exchange is an organized, regulated market where shares of listed companies are bought and sold. Each stock's price emerges from the meeting of supply and demand, not from a decision by the exchange or the company. Most trades happen in the secondary market, between investors -- not directly with the company.\n\n## Self-check\n\nWho really sets a stock's price on an exchange?\n\nWhat's the difference between the primary market and the secondary market?","bodyHtml":"By the end of this lesson you understand what a stock exchange is, what role it plays as a regulated institution, and how a stock's price is determined within it.
\nA stock exchange is an organized, regulated financial market specifically dedicated to trading shares of companies listed on it. "Organized" means it follows clear rules about how trades are executed; "regulated" means a supervisory body oversees that those rules are followed and that participants receive truthful information -- in Spain, that body is the Comisión Nacional del Mercado de Valores (CNMV).
\nA very common misconception is thinking that the exchange "sets" a stock's price, as if it were a catalog with prices decided in advance. That's not how it works: the price continuously emerges from the meeting of buy orders and sell orders from all participants. If at a given moment more investors want to buy a stock at the current price than investors are willing to sell it, the price tends to rise; if the opposite happens, it tends to fall. The exchange simply organizes that meeting in an orderly and transparent way -- it doesn't decide the outcome.
\nIt's important to distinguish two different moments in a stock's life on the exchange:
\nThe vast majority of the trades you see reflected in a stock's price, day to day, happen in the secondary market, between investors -- not between an investor and the company.
\nThe Madrid Stock Exchange, the New York Stock Exchange (NYSE), and the Nasdaq are real examples of stock exchanges. Each organizes trading for the shares of the companies listed on it, with its own hours, admission rules, and trading systems -- but on all three, the underlying mechanism is the same: matching buy and sell orders to form a price.
\nA stock exchange is an organized, regulated market where shares of listed companies are bought and sold. Each stock's price emerges from the meeting of supply and demand, not from a decision by the exchange or the company. Most trades happen in the secondary market, between investors -- not directly with the company.
\nWho really sets a stock's price on an exchange?
\nWhat's the difference between the primary market and the secondary market?
","sortOrder":2,"readingMinutes":5,"difficulty":"Básico"},"next":{"id":5,"moduleId":2,"slug":"what-are-stock-market-indices","title":"What are stock market indices?","summary":"You recognize the main stock market indices, what they're used for as an aggregate benchmark, and what they do NOT measure.","bodyMarkdown":"## Objectives\n\nBy the end of this lesson you recognize the main stock market indices, what they're used for as an aggregate benchmark, and what they do NOT measure.\n\n## Content\n\nA stock market index is an indicator that summarizes, in a single number, the combined performance of a specific group of stocks -- usually the most representative ones on an exchange, in a country, or in a sector. It isn't a stock you can buy directly: it's an aggregate measure, calculated from the price -- and sometimes other variables, like market capitalization -- of the companies that make it up.\n\nEach index has its own rules: which companies it includes, how it weights each one (they don't all carry the same weight in the calculation -- companies with a larger market cap tend to carry more weight), and how often its composition is reviewed. That's why two indices from the same exchange, or from different exchanges, aren't directly comparable without knowing their rules.\n\nAn index serves as a quick benchmark -- \"did the market go up or down today?\" -- and as a comparison point for evaluating whether a portfolio or a fund did better or worse than the market as a whole. But it's important to be precise about what an index does NOT measure: it doesn't measure a country's \"economy\" as a whole -- an economy has sectors, employment, and consumption that don't reduce to a handful of listed companies -- and it doesn't include every company listed on an exchange, only the ones that meet the index's selection criteria.\n\n## Example\n\nThe IBEX 35 groups the 35 largest companies listed on the Spanish exchange by market cap and liquidity; the S&P 500 does the same with 500 large U.S. companies. If the IBEX 35 rises on a given day, it doesn't mean all 35 companies rose -- it means the group as a whole, weighted according to the index's rules, rose.\n\n## Common mistakes\n\n- Confusing an index's performance with a country's \"economy\" as a whole -- an index measures a specific group of listed companies, not all economic activity.\n- Assuming that every company on an exchange is in its main index -- an index only includes the ones that meet its selection criteria, such as size or liquidity.\n\n## Summary\n\nA stock market index summarizes, in a single number, the combined performance of a specific group of stocks, selected and weighted according to each index's own rules. It serves as a quick market benchmark, but it doesn't measure the economy as a whole, nor does it include every listed company.\n\n## Self-check\n\nWhy can't you buy \"an index\" directly, as if it were a stock?\n\nWhat's the difference between an index rising and every company on that exchange rising?","bodyHtml":"By the end of this lesson you recognize the main stock market indices, what they're used for as an aggregate benchmark, and what they do NOT measure.
\nA stock market index is an indicator that summarizes, in a single number, the combined performance of a specific group of stocks -- usually the most representative ones on an exchange, in a country, or in a sector. It isn't a stock you can buy directly: it's an aggregate measure, calculated from the price -- and sometimes other variables, like market capitalization -- of the companies that make it up.
\nEach index has its own rules: which companies it includes, how it weights each one (they don't all carry the same weight in the calculation -- companies with a larger market cap tend to carry more weight), and how often its composition is reviewed. That's why two indices from the same exchange, or from different exchanges, aren't directly comparable without knowing their rules.
\nAn index serves as a quick benchmark -- "did the market go up or down today?" -- and as a comparison point for evaluating whether a portfolio or a fund did better or worse than the market as a whole. But it's important to be precise about what an index does NOT measure: it doesn't measure a country's "economy" as a whole -- an economy has sectors, employment, and consumption that don't reduce to a handful of listed companies -- and it doesn't include every company listed on an exchange, only the ones that meet the index's selection criteria.
\nThe IBEX 35 groups the 35 largest companies listed on the Spanish exchange by market cap and liquidity; the S&P 500 does the same with 500 large U.S. companies. If the IBEX 35 rises on a given day, it doesn't mean all 35 companies rose -- it means the group as a whole, weighted according to the index's rules, rose.
\nA stock market index summarizes, in a single number, the combined performance of a specific group of stocks, selected and weighted according to each index's own rules. It serves as a quick market benchmark, but it doesn't measure the economy as a whole, nor does it include every listed company.
\nWhy can't you buy "an index" directly, as if it were a stock?
\nWhat's the difference between an index rising and every company on that exchange rising?
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