Common stock looks like the easy part of the SIE. It is also where a lot of candidates quietly drop marks, because the exam does not really ask what a share is. It asks what a share entitles you to, where it ranks when things go wrong, and whether you can do the maths under time pressure.
In this article
- Why companies issue stock in the first place
- What a share actually entitles you to
- Dividends, retained earnings and what they tell you
- Where common stock sits on risk and reward
- Stock splits: the maths the exam actually tests
- Dilution and preemptive rights
- The liquidation priority order
- What to focus on, and what to leave
I am Mike Finnen. I spent 37 years as a trader and principal on the floor of the New York Stock Exchange, so I have watched common stock trade through a few crashes and more than a few bubbles. This is the ten-thousand-foot view of common stock for the SIE, with the parts the exam actually leans on.
Why companies issue stock in the first place
Every issuer that needs capital has two ways to get it. They can take on debt, which means borrowing from investors and promising to pay it back. Or they can sell a piece of the company itself. That second option is equity, and common stock is the purest form of it.
Think about a bakery worth $100,000. If the owner gives up 25% of the business to raise money, they have sold $25,000 of ownership. The buyer now owns a quarter of that bakery.
Public markets work the same way, just with much smaller slices. If you buy Microsoft shares you might own 0.0001% of the company. Bill Gates owns rather more. But on a per-share basis you are exactly as much of a shareholder as he is, with the same rights attached to every share you hold. That idea — that rights attach to the share, not to the person — is worth holding on to, because the whole topic follows from it.
What a share actually entitles you to
Voting rights
One share, one vote. What you are voting on matters for the exam: shareholders do not vote on the day-to-day running of the business. You vote on major corporate matters and, above all, on who sits on the board of directors.
It works like a republic rather than a direct democracy. Shareholders elect the board. The board appoints the executives. The executives run the company day to day. If you are unhappy with how the company is being run, your lever is the board, not the boardroom.
A prorated claim on dividends
Owning shares gives you a right to dividends if the company declares them, in proportion to what you own. That conditional is important. Common stock carries no promise of income. A dividend has to be declared by the board, and it can be reduced or stopped.
Dividends, retained earnings and what they tell you
When a company earns money it has a choice: reinvest it, or hand some of it to shareholders. Which way it leans tells you what kind of company you are looking at.
A growth company puts the money back into the business. Picture a restaurant chain operating in Texas and Oklahoma that wants to go national. Every dollar of earnings is fuel for that expansion, so shareholders see little or nothing in dividends. Investors accept that because they are buying future growth, which is why growth stocks tend to carry a higher price-to-earnings ratio.
A value or blue chip company is established. Nobody expects it to start growing 30% or 40% a year, so the market values it more conservatively and its P/E is lower. It also does not need to hoard cash to expand, so it pays out much more of what it earns.
Whatever is not paid out is retained earnings. If a company earns $5.00 per share and pays $4.90 in dividends, it has retained $0.10 per share — a payout ratio of 98%. A growth company that earns $3.00 and pays nothing has retained the full $3.00. Retained earnings are simply earnings minus dividends, and the exam likes to check that you know which direction that subtraction runs.
Where common stock sits on risk and reward
Common stock sits at the bottom of the liquidation order, which is covered in full below. In practice, if a company goes bankrupt, common shareholders usually receive nothing.
You take the most risk if the company fails, and you capture the most upside if it succeeds. Those two facts are the same fact.
That upside is capital appreciation. There is no ceiling on it, which is what makes common stock worth owning despite its position in the queue.
It also leads to a point the SIE returns to repeatedly: common stock is the best hedge against long-term inflation. Over a horizon of roughly five years or more, equities have historically outpaced rising prices. Over the short term they are a poor inflation hedge, because they simply fluctuate too much.
This is why suitability questions so often push younger investors toward equities. Someone with decades ahead of them has to beat inflation, and fixed-income products struggle to do that precisely because the income is fixed. The payment does not rise as prices do.
Stock splits: the maths the exam actually tests
Splits trip people up more than they should, because the arithmetic is always the same once you see the pattern.
A company does a forward split when its share price has climbed high enough to put buyers off. This sounds irrational, and it is, but it is real. Offer someone one share at $1,000 or a hundred shares at $10 and most people take the hundred shares — even though the two are worth exactly the same. Splitting the stock brings the headline price back into a range that feels approachable, particularly to retail investors.
Here is the method. Divide the first number by the second to get your split factor, then multiply the shares and divide the price.
Say you own 100 shares of XYZ at $50 and the company declares a five-for-one split. Five divided by one gives a factor of 5. Multiply the shares: 100 × 5 = 500 shares. Divide the price: $50 ÷ 5 = $10. You now hold 500 shares at $10. Your position is worth $5,000 either way — a split changes the packaging, not the value.
Uneven splits work identically. A three-for-two split gives a factor of 1.5; a seven-for-five gives 1.4.
A reverse split runs the same machinery backwards. A company whose shares have fallen so far that it risks being delisted may declare a one-for-five. One divided by five is 0.2. Multiply the shares and you end up with fewer of them; divide the price and it goes up. Same total value, higher headline price, listing requirement satisfied.
Stock dividends use the same trick. A 25% stock dividend means you receive 25% more shares, so your factor is 1.25. Multiply the shares, divide the price. Stock dividends are more common at growth companies, for the reason above — they let a company reward shareholders without parting with cash it would rather reinvest.
Dilution and preemptive rights
Anyone who has seen The Social Network knows what dilution looks like from the wrong end. Mark Zuckerberg’s co-founder believed he held roughly a third of the company and discovered his stake had been diluted to almost nothing. He remained a wealthy man. Nobody wants that to happen to them anyway.
The mechanics are straightforward. Suppose a company has 100,000 shares outstanding and you own 10,000 of them. You own 10%. The company then raises money by issuing another 100,000 shares. There are now 200,000 shares outstanding and you still hold 10,000 — so your stake has halved to 5%. You did nothing wrong and lost half your ownership.
The protection against this is a preemptive right. It lets existing shareholders buy newly issued shares in proportion to what they already own, so they can maintain their percentage. The terms vary: one right per share held, with some number of rights required to buy one new share.
Two features matter for the exam. Rights are short-term, and they are issued at a price below the current market price. If the stock is trading at $50 and your right lets you buy at $40, that right has immediate intrinsic value. It is worth money the moment you receive it.
That gives you three choices: exercise the right and buy the shares, sell the right to someone else, or let it expire. Letting it expire is throwing money away. Even if you cannot afford to take up the shares, sell the right. During its life the right trades separately, on a when-issued basis, at a value reflecting the gap between the subscription price and the market price.
Warrants are the long-term cousin. They also let you buy stock at a set price, but they run for years rather than weeks and are typically attached to a bond issue as a sweetener to make the debt more attractive. Short-dated equals rights; long-dated equals warrants. That distinction alone answers most exam questions on the topic.
The liquidation priority order
If you memorise one list from this article, make it this one. It appears on the SIE and on every FINRA exam after it. When a company is wound up, claims are paid in this order:
- Secured creditors — bondholders whose debt is backed by specific collateral. They are paid first, and they can liquidate the asset securing their claim.
- Unsecured creditors and general creditors — debenture holders and suppliers, backed by the full faith and credit of the company rather than a specific asset.
- Subordinated (junior) debt holders — debt that ranks behind the senior debt above it.
- Preferred shareholders — equity, but it behaves far more like fixed income, and it ranks above common.
- Common shareholders — last in line, and usually left with nothing.
For the fuller treatment — including where unpaid wages and taxes sit, and what happens when collateral does not cover a secured claim — see the liquidation order in Part 2 of shareholder rights.
Preferred stock deserves a piece of its own, and it will get one. For now, the thing to hold on to is that it sits above common stock in this queue.
What to focus on, and what to leave
A word on exam strategy. There is a rights and ex-rights valuation calculation that sometimes appears. In my view it is one of the last things you should spend time on. If one shows up, flag it, work through the rest of the paper, and come back at the end if you have time. The risk-reward of burning ten minutes on a single question is poor.
What you should know cold: what a right is, that it is short-term, that it has immediate intrinsic value, and that you should always exercise or trade it rather than let it lapse.
And before any of the individual topics matter, you need a schedule you can actually finish. I wrote up the study plan I give every candidate, including how many hours the SIE really takes.
One last thing, because it is relevant to how you think about equities. In the mid-nineties, an analyst and trader at one of the funds I dealt with left Wall Street to sell books out of his garage over the internet. The floor thought he had lost his mind. That was Jeff Bezos. Never judge a company by how obvious it looks at the time — which is the entire argument for owning common stock.
Frequently asked questions
What is the difference between common stock and preferred stock?
Both are equity, but preferred stock behaves much more like fixed income: it pays a set dividend and generally carries no voting rights. Crucially for the exam, preferred ranks above common in the liquidation order.
Where does common stock rank if a company goes bankrupt?
Last. Secured creditors, then unsecured and general creditors, then subordinated debt, then preferred shareholders, then common shareholders. In most bankruptcies, common shareholders recover nothing.
How do I calculate a stock split on the SIE?
Divide the first number by the second to get the split factor, then multiply your shares by it and divide the price by it. A four-for-one gives a factor of 4; a one-for-five reverse split gives 0.2. The total value of your position does not change.
Should I ever let a preemptive right expire?
No. Rights are issued below the market price, so they carry intrinsic value from day one. If you do not want to buy the additional shares, sell the right rather than let it lapse.
The short version
Common stock is ownership. It brings votes, a conditional claim on dividends, unlimited upside and last place in the queue if things go wrong. Learn the liquidation order, get comfortable with the split arithmetic, and understand why rights are worth money the day they arrive. That covers most of what the SIE will ask you.
If you would like to work through this material with someone who traded it for a living, get in touch or have a look at the tutoring options.
