Investing in Stocks
Understand what a share really is: common vs preferred stock, company size, what moves prices over years, and the mistakes to avoid.
TL;DR
- A share of
commonStockmakes you a part-owner with a vote and a claim on profits. - Company size is measured by
marketCap: price times shares, from small-cap to mega-cap. - Over years a stock follows the business; rising
earningsGrowthis what lifts the price.
What a Share Actually Is
Common StockOne share makes you a part-owner with a vote and a claim on profits.
1 share = part-owner + 1 votePreferred StockPays a fixed dividend and gets paid first, but usually cannot vote.
Steady payout, limited upsideDividendsSome companies hand shareholders part of the profit in cash.
$2/share x 100 shares = $200/yrCapital GainsYou profit when you sell a share for more than you paid.
Buy at $50, sell at $75 = $25 gainCompany Size (Market Cap)
How It Is MeasuredMarket cap is the share price times the number of shares outstanding.
$50 x 200M shares = $10BMega and Large CapBig, established firms above $10B, often household names.
>$200B mega, $10B-$200B largeMid CapGrowing companies with more room to expand.
$2B-$10B, faster growthSmall CapYounger and more volatile, with higher risk and reward.
$300M-$2B, bumpier rideWhat Drives Price Over Time
Earnings GrowthRising profit per share is the main force lifting a stock over years.
EPS up 10%/yr pulls price upRevenue and MarginsMore sales, with costs under control, means a healthier business.
Sales up + costs steady = profitShare BuybacksFewer shares mean each remaining one owns more of the profit.
Fewer shares -> higher EPSReinvested DividendsPayouts put back into shares compound alongside the price.
Reinvest to grow fasterCommon Stock Mistakes
Skipping the HomeworkKnow how the business makes money before you buy the stock.
Read the basics, then buyChasing Penny StocksTiny, thinly traded firms are easy to manipulate and hard to exit.
Avoid sub-$5 hype tickersToo Much in One NameA single oversized position can sink your whole plan.
Keep any one stock <= 5-10%Chasing Last Year's WinnerThe hottest stock of last year rarely repeats the feat.
Past gains do not predict futureTips
- Buy businesses you understand with a durable edge, not ticker symbols moving on the day's
sentiment; over time price tracks profit, not headlines. - Spread money across several sectors so one bad industry cannot wreck your whole
portfolio; even great companies have terrible years.
Warnings
- Never buy an individual stock without a look at its basic numbers; a rising price with falling
earningseventually corrects downward. - Avoid penny stocks and unknown micro-caps; thin trading and murky accounting make them easy to pump and prone to
totalLoss.
In Practice
See how a company buying back its own shares lifts earnings per share without earning a dollar more.
A company you own shares in earns $100M in profit with 50M shares. It buys back 10M of them.
- Starting earnings per share: $100M profit / 50M shares = $2.00 per share.
- Shares left after the buyback: 50M - 10M = 40M shares.
- New earnings per share, same profit: $100M / 40M = $2.50 per share.
- Growth per share: ($2.50 - $2.00) / $2.00 = 25% more earnings each share owns.
Your shares now claim 25% more profit each, with no rise in the company's total earnings.
Buybacks and dividends both return profit to owners; watch how a company uses its cash, not just its price.
FAQ
Common stock gives you a vote and full upside if the company grows, but dividends are not guaranteed. Preferred stock pays a fixed dividend and gets paid before common holders if things go wrong, but it usually has no vote and limited price growth. Most beginners own common stock through funds.
Over years, price follows the business: growing earnings per share, rising revenue, and smart use of profits. Day-to-day moves are mostly mood and news, but a company that steadily earns more will pull its stock up with it.
Holding 20 to 30 companies across different industries removes most of the risk tied to any single business. A single broad index fund does this for you instantly by holding hundreds or thousands at once.
Start with a broad index fund so you own the whole market cheaply and safely. If you want to try picking individual stocks, keep them a small slice of your money, so a mistake is a lesson rather than a disaster.