01
Who is the Trend Dolphin?
The Trend Dolphin (QMDN) is a quick, numbers-first investor who owns a little of whatever is moving and swaps it out when something stronger comes along. Dolphins rank stocks by how they’ve been moving and keep a wide group of the strongest ones, checking the list on a set schedule instead of by gut feeling.
Most investors pick a stock first and then go looking for reasons to keep it. Dolphins work the other way around. They start with a list sorted by recent strength, and whatever sits near the top gets a spot, even a company they hadn’t heard of until last Tuesday.
That isn’t carelessness. Dolphins have decided that noticing what’s already happening is easier than guessing what happens next, and they trust a rule they can check more than a hunch they can’t. There’s almost always another stock that looks a little stronger, so the question they keep facing is whether a change makes the portfolio better by enough to be worth the trade.
The list does the picking
Ask a Dolphin why they own a certain stock and you may get a slightly sheepish answer: it ranked fourth on Friday. They aren’t hiding a secret theory about the company. The ranking is the reason, and they like that it treats every stock by the same rules, including the ones they quietly hope will win.
That habit keeps them honest about favorites. It also means they can own a company for a month without knowing much about what it sells, which the more careful Dolphins eventually notice and start to fix.
No hard feelings
Selling is easy for Dolphins. When a holding slips down the list it goes, and they rarely spend the evening wondering whether they misjudged it. They bought it for a stated reason, and once the reason is gone, the stock can go too.
Friends who agonize over every sale find this a little unsettling. Dolphins find it relaxing, since they never have to defend one company at a dinner party, and a loss on a single name rarely spoils their week.
Swimming in a pod
Dolphins would rather own twenty strong stocks than three great ones. Spreading out means one surprise can’t do much damage, and they’re happy to catch a slice of every wave instead of betting everything on the biggest one.
The catch is that a pod moves together. When the whole market turns, twenty strong stocks can drop at once. A Dolphin who only watches the order of the list may not see it until the next review.
02
Strengths and weaknesses
Strengths
Same rules for everyoneDolphins compare every stock the same way, including the one they already own and like. That makes it hard to go easy on a favorite, and it leaves a record of what the numbers actually showed at the time.
Always in the strong stuffBecause they rotate on a schedule, their money tends to sit in whatever has been working lately. They don’t have to wait years for a slow idea to finally come around.
Sells without regretA Dolphin can let go of a stock as soon as the reason for owning it is gone. They don’t need the price to come back first, and they don’t treat the sale as a verdict on themselves.
Spread outWith many holdings, one bad pick can’t sink a Dolphin’s month. They expect some names on the list to fade fast and set up the portfolio so that it barely matters when one does.
Adapts quicklyWhen the market changes direction, Dolphins change with it at the next review. They never have to admit a grand prediction was wrong, because they didn’t make one in the first place.
Low dramaHot tips and scary headlines don’t move them much, since the list decides and the list only updates on schedule. A Dolphin’s week is usually calmer than you’d guess from how often they trade.
Weaknesses
Sharp reversalsTrends tend to break all at once, and stocks that rose together often fall together. A Dolphin who checks once a week can learn about a turn several days after it started.
Trades too muchIf every small move up the list becomes a reason to swap, the portfolio changes far more often than anyone meant it to. Each trade costs a little, and in a taxable account each sale can come with a bill.
Never firstDolphins buy stocks after they’ve already moved, so they always miss the very start of a run. That’s the price of waiting for proof, and it stings most when a stock looks obvious in hindsight.
Choppy marketsWhen nothing trends for long, a Dolphin can rotate into a stock right before it fades, then do the same with the next one. A few months of that can wipe out the gains from a good stretch.
Strangers in the portfolioWhen a ranking picks twenty names, it’s easy to own companies you couldn’t describe in a sentence. That’s fine until one of them makes the news and the Dolphin has no idea whether it matters.
Tinkers with the rulesAfter a bad month, it’s tempting to change the look-back period, the schedule and the number of holdings all at once. Do that a few times and it becomes impossible to tell which change helped and which one hurt.
03
In every market
In a sharp decline
The whole pod turns at once
A sharp drop is hard on Dolphins. The strong stocks they own are often the most crowded ones, so they can fall the furthest, and the weekly check may arrive after much of the damage is done. Swapping into the next names on the list feels like doing something, even when those names are falling for the same reason.
What helps is a rule that looks at the whole market before it looks at the list, like owning less when the broad market sits below its long-term average. It won’t catch the first drop, but it can keep a Dolphin from buying straight back into the next one.
In a strong rally
Their favorite weather
Long, clean trends are where Dolphins shine. The list fills with winners and every rotation seems to land on something new and strong, so the weekly review starts to feel like a small party.
The risks here are quieter. One is skipping a review because things are going well. Another is giving the picks credit for what the whole market did. Comparing the portfolio with the full group it picks from shows whether the ranking added anything or just rode along.
In a sideways market
A lot of swimming in place
Sideways markets wear Dolphins out. Leaders change every couple of weeks and trends stop before they get going, so the portfolio can turn over completely while its value barely moves.
Checking less often usually helps, and so does deciding how much better a new stock needs to be before it replaces an old one. A Dolphin who adds up what a quiet quarter’s trades actually cost is often surprised by the total.
04
Day to day
How they research
A Dolphin’s research is mostly the list. They keep a ranking of stocks sorted by how they’ve moved and check it on a set day, often once a week. They don’t read much news about single companies, because the ranking does the picking. Once the swaps are made, they mostly leave the portfolio alone until the next review comes around.
How they talk about stocks
Bring up a stock at dinner and a Dolphin will tell you where it ranks, not what the company makes. They can sound oddly detached about stocks they own, which confuses friends who expect a story about why they bought it.
Story-first friends may find them a little robotic, and Dolphins may find those friends a little sentimental. Each side is usually right about the other’s blind spot, which makes for good arguments.
How they handle losses
Dolphins handle a single loss well, since one name is a small part of the whole. They take it much harder when the entire list goes wrong together, because that feels like the method failing instead of one pick.
The trap after a bad stretch is rewriting the rules right away. The Dolphins who improve fastest wait a little, look at what actually happened, and change one thing at a time.
05
With other types
Sprinters · QMDS
Kindred spirit
The Theme Chameleon rotates just as quickly, but by story instead of by number. Dolphins can borrow its habit of asking why several stocks are rising together, which shows whether five holdings are five ideas or really one.
Climbers · PMDN
Friendly challenger
The Marching Penguin also follows strength across many stocks, but over years instead of weeks. Its favorite question, “what actually needs a new decision today?”, is a good brake for a Dolphin about to trade on a tiny change in rank.
Sprinters · QMFN
Close cousin
The Breakout Cheetah chases strength too, but it puts its money into a few stocks and pays close attention to the moment it buys. Dolphins can borrow that care for the gap between a stock showing up on their list and the trade they actually place.
06
Growing as a Dolphin
- 1
Decide what makes a swap worth it
Before your next review, write four short answers:
- Selection
What does a stock need to make your list?
- Replacement
How much better does it need to be before you sell something you own?
- Timing
When will you check that gap, and how often?
- Portfolio
How should the change affect the group as a whole?
These are four separate decisions. A stock making your list doesn’t mean it should push out one you already own.
- 2
Keep a log of every swap
Each time you swap, write down what you sold, what you bought, and what improvement you expected. Include the times you kept a holding even though something else looked tempting, and note how the stocks you sold did afterward.
After a few months, read the log in one sitting. You may find that your picking rules stayed the same while your willingness to trade rose and fell with your recent results. That’s a far easier problem to fix than a vague sense that you trade too much.
- 3
Read your portfolio without the names
For each holding, write one line on what it depends on, such as rising rates, strong consumer spending, or the same kind of price strength that got it picked. Then cover the names and ask:
- How many lines say roughly the same thing?
- Which holdings would fall for the same reason?
- Did your last swap add something new, or the same bet again?
- Is that the amount of variety you meant to have?
This won’t tell you what to own, but it shows whether twenty stocks really are twenty separate bets.
07
Strategies that fit
Dolphins tend to like ranking stocks by recent gains, rotating between sectors, or owning the market’s top movers in equal slices and swapping them on a schedule. They look different on the surface, but they all come down to owning what’s strongest now and changing the group when the list changes.
Whichever one appeals to you, look closely at how it decides when to swap. Much of the difference between two methods like these comes from the schedule and the bar a new stock has to clear. You should be able to explain both without pointing to last month’s results.
08
The Dolphin in the long run
Dolphins rarely own the stock everyone’s talking about at the very start of its run, and they rarely hold it at the very end. What they get instead is a portfolio that keeps drifting toward strength, without one company carrying the whole result.
Growing as a Dolphin isn’t about trading faster or finding a cleverer ranking. It’s about knowing which changes are worth making, keeping the rules steady long enough to learn from them, and being able to say what each swap actually improved.
“Think of the last stock you swapped out. Apart from ranking a little higher, what did the new one actually add to your portfolio?
Curious how your style would actually do? Describe its rules in Alphaground and let an agent follow them with practice money, so you can watch every decision it makes.
16 Investor Types describes the preferences you report in the test, not your skill. Nothing here is investment advice.
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