How to Buy a Put Option
To buy a put option, first decide whether you are betting on a fall or insuring a holding, because the two use different strikes and expiries. Then name how far and by when, choose the contract from that, and treat the premium as spent.
A put gives the right, not the obligation, to sell the underlying at a fixed price until a fixed date. That single structure serves two completely different purposes, and almost every mistake with puts comes from not deciding which one you are buying.
Before you start
A decision about whether this is a directional bet or insurance on something you own. A bet wants a strike the fall will reach. Insurance wants a strike that caps a loss you cannot tolerate.
A size of fall and a deadline, because a put needs both. “It falls 12% within two months” is a view a contract can be chosen against.
The premium treated as spent the moment it is paid. That framing is accurate, and it removes the urge to rescue a position that is doing what you paid for it to do.
The steps
1. Write down which of the two jobs it is doing
The answer changes the strike, the expiry and how you judge the outcome. An insurance put that expires worthless did its job; a directional put that expires worthless did not.
2. Name the size of the fall and the date
On this site’s shared series 95% of bars sit below a prior peak and the largest drawdown was 3.76%, so a view requiring a large fall needs a window that allows for it.
3. Choose the strike from the job
For insurance, the strike is the price below which the loss stops being tolerable. For a bet, it is a level the fall you described actually reaches.
4. Buy more time than the view needs
An expiry that ends before the move arrives produces the same result as being wrong. The extra premium is the price of removing that outcome.
5. Check the contract can be sold as well as bought
Open interest and a reasonable spread. A contract nobody trades turns every exit decision into holding to expiry, which was not the plan for either job.
6. Size it as money you are spending
The defined loss is the entire premium. Size so that losing all of it changes nothing structural, which is the same test as any other position.
7. Decide both exits before you buy
The price at which you take the gain and the date at which you accept the view did not happen. Deciding either while holding is deciding under pressure.
How to tell it worked
The job is written down as 1 of 2 options, bet or insurance, before any contract was chosen.
The expiry sits beyond the deadline in the view, so timing has slack.
The contract has traded on at least 1 of the last 5 days, so it can be sold.
And both exits were written before the purchase, one for the gain and one for the date.
Insurance behaves differently from a bet
A protective put has an annual cost, and that is the number to look at. Buying protection four times a year means four premiums, and judging any one of them on whether it paid out is the wrong measurement.
It gets expensive exactly when it looks most necessary. The market’s estimate of future movement rises during falls, and the premium rises with it. Protection bought calmly is materially cheaper than protection bought during a decline.
Which is why a protective put is a budgeting decision. If the annual premium is more than the exposure is worth, the honest answer is a smaller position rather than a cheaper hedge.
What the premium buys
Time and exposure, both decaying. Every day held, some value attributable to remaining time is gone regardless of what the underlying did. This is what makes a long option different from a short position.
On an illiquid contract the spread alone can be a large fraction of the premium, charged twice. That is a hurdle the underlying never has to clear.
The original data
Of the 24,971 unique videos in research/search-study-corpus.jsonl, 23 mention put options in the
title, at a median of 56,794 views across 19 channels, and 52% of those titles are instruction-shaped.
Calls appear in 13 at 77,171, and options generally in 889 at 10,399. The counts come from
site/corpus_count.py.
23 videos at 56,794 against 889 on options generally at 10,399. A fortieth of the coverage and five times the audience per video — and virtually none of it separates the insurance use from the directional one, which is the distinction that decides the contract.
The answer to the question on that chart depends entirely on which job you bought it for. As insurance, an expired put is a policy that was not claimed on, which is the ordinary outcome. As a directional bet it is a loss, and the fact that both look identical on a statement is why the job has to be written down first.
When it fails
The failure is judging insurance as though it were a bet, and it ends with the protection removed. Three quarters pass, three premiums are paid, nothing falls, and the cost starts to look like waste. The hedge gets dropped as an economy — and the exposure it was covering is unchanged, sitting there with the position sized as though the protection were still in place.
The second failure is buying on affordability. A cheap strike encodes an unlikely fall.
A third is buying protection during a decline. Expected movement has already repriced.
A fourth is an illiquid contract. You can enter and not leave.
A fifth is no written deadline. The view then has no end.
And a sixth is sizing as though a defined loss is a small one. It is the whole premium.
Related
Put option covers the contract itself. Hedging is the insurance use and what it costs over a year. And options expiry is the deadline that decides most of these outcomes.
The reframe that helped was treating a protective put as a policy with a premium and a term, not as a trade. Nobody expects house insurance to make money. Once I stopped judging it on whether it paid out, I could ask the actual question, which is whether the annual cost is worth the exposure it removes.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.