Designing a Portfolio

Imagine your school gives you a small farm to look after. Not a pretend one - a real patch of ground with real plants that will die if you forget them. Someone hands you a bag of seeds and says, "Plant as many as you like." What do you do?

The first thought most people have is: more is better. More seeds, more plants, more food - plant everything! So they scatter the whole bag across the field in one afternoon, feel very pleased, and go home. But a week later there's a problem. There are forty little plants now, all needing water on different days, all getting different bugs, some in the shade and some in the sun. You cannot possibly walk the whole field every day. You water the ones near the gate, forget the ones at the far corner, and by the end of the month half your farm has quietly died while you weren't looking. You didn't fail because you planted bad seeds. You failed because you planted more than you could tend.

That is the whole idea of this chapter, and it flips the way most people think about owning shares. Almost everyone believes that a good investor owns lots of different companies - twenty, thirty, forty names on a list - because "spreading out" sounds safe and grown-up. But owning a share is not like locking a coin in a box and walking away. A share is a living thing, like a plant on your farm. It has news you must read, results you must check, a story that can quietly break while your back is turned. And here is the catch nobody mentions: you only have so many pairs of eyes and so many free evenings.

So the right number of companies to own is not a big round number someone told you. It is however many you can actually keep up with. Own only as many companies as you can genuinely follow - read their results, watch their business, notice when the reason you bought breaks - and let your own attention decide the number, not a rule that says "hold twenty to be safe." A small, well-tended farm feeds you. A huge, forgotten one just rots.

Let's slow down and ask why attention - not money - is the thing that runs out first.

When you buy a share, you're really buying a small slice of a real, working business. That business keeps doing things every single day after you buy it. It sells products, it borrows money, it opens factories, it competes with rivals, and every three months it tells the world how it's doing. If you own that share properly, part of your job is to keep listening. Did profits grow or shrink? Did the company take on scary amounts of debt? Did the reason you bought it - "people love this product" - still hold true, or did something change? A share you never check is a share you don't really understand any more; you just hope it's fine.

Now here's the arithmetic of a busy life. Suppose keeping up with one company - reading its results four times a year, following its news, thinking properly about it - takes you, say, a few careful hours across the year. That's not much for one company. But you are not a full-time investor. You have school or a job, a family, a life. Maybe you can spare a handful of evenings a year for this. If you own five companies, you can give each one real attention. If you own thirty, you have spread those same few evenings across thirty stories, and now each one gets a thin, distracted glance - barely enough to remember what the company even does, let alone notice trouble creeping in.

This is the quiet trap. Money is easy to spread - you can split ₹1,00,000 across thirty companies with a few taps. But understanding cannot be split that way. Splitting your money thirty ways doesn't give you thirty times the safety; it gives you thirty half-forgotten plants and one very tired farmer. The thing that decides how well you can invest isn't the size of your wallet - it's the size of your attention. And attention, unlike money, cannot be borrowed or topped up. So the sensible move is to build a garden you can actually walk around, not one so large you get lost in it.

Before we decide how many to own, we need to notice something important: companies are not all the same kind of thing. On our little farm, some plants grow fast and tall but blow over in a storm. Some grow slowly but stand firm through anything. Some barely grow at all but reliably give you a handful of vegetables every week. A wise farmer doesn't plant only one kind - she mixes them, so that a storm which flattens the tall ones still leaves the sturdy ones standing.

Companies come in kinds too. Let's give them plain names.

A fast grower is a young, hungry company whose sales are climbing quickly - a new snack brand opening in city after city, say. If it works, its value can multiply many times over. But it's like the tall, fast plant: exciting, full of promise, and easy to knock over. Many fast growers stumble, run out of money, or grow too quickly and crack.

A stalwart is a big, solid, boring company that has been around forever and sells things people always need - a giant that makes soap, or biscuits, or electricity. It won't multiply ten times; it grows slowly and steadily. But it also rarely falls apart. In a storm, this is the plant still standing. Its job in your farm is not to make you rich fast - it's to cushion the fall when the exciting plants get flattened.

A slow grower is a huge, old, gently-plodding company that barely grows at all but usually shares out steady cash to its owners. And there are a few other kinds too - companies climbing out of trouble, or ones sitting on hidden treasure - but you don't need every name. The one thing to hold onto is this: the tall exciting plants and the sturdy boring plants do opposite things in bad weather, and that's exactly why you want both.

So a good farm - a good portfolio - isn't a pile of identical bets. It's a small mix, chosen so that the pieces don't all rise and fall together. That mixing is the second half of the idea, and we'll build it up carefully.

Let's put real rupees down and watch what a too-big list does to an ordinary person. illustrative

Meet Aarohi. She's careful and keen, and over a few years she has saved ₹3,00,000. She reads that "diversification" keeps you safe, and she takes it to mean own lots of things. So over eighteen months she buys a little of everything that catches her eye - a snack company here, a bank there, a paint maker, a small software firm, a jewellery chain, a sugar mill, three different "hot tip" companies from her group chat, and on and on. By the end she owns twenty-two different companies, roughly ₹13,000 in each.

She feels wonderfully safe. Twenty-two! Surely nothing can go badly wrong across twenty-two companies. But watch what actually happens over the next two years.

Aarohi has a job and two young daughters. She can spare, honestly, about one evening every couple of months to look at her investments. Twenty-two companies, four results a year each, is eighty-eight sets of results a year - and she has maybe six evenings. So she doesn't read them. She glances at the total value in her app, sees it's roughly flat, and closes it. Meanwhile, buried in that list, one of her companies - the sugar mill - quietly loads up on debt it cannot repay, and its shares slide 70% over a year. She never noticed, because "the sugar mill" was just a name on a long list she couldn't keep straight. Two of her "hot tip" companies drift to almost nothing the same way.

Here's the honest scoreboard. Three of her twenty-two companies quietly rotted, and together they dragged about ₹28,000 off her savings - not through bad luck, but through not looking. Worse, she can't even tell you why she owns most of the others, or which ones are doing well, because she never had the hours to find out. Her big, safe-feeling list didn't protect her. It just gave her more plants than she could ever water, so the weak ones died in a corner she never visited.

Now let's rewind and let Aarohi do it the farmer's way, so you can feel the difference in rupees. illustrative

Same ₹3,00,000, same busy life, same six evenings a year. But this time Aarohi asks herself a blunt question before buying anything: "How many company stories can I actually keep up with?" She's honest. With her job and her daughters, she decides she can properly follow about six. Not because a book said six - because six is what her real evenings can carry. So she builds a small garden of six, and she chooses them so they aren't all the same kind of plant.

She picks two sturdy stalwarts - a big soap-and-food giant and an electricity company - the boring plants that hold firm. She picks two fast growers she genuinely understands - a snack brand she's watched fill up shops near her home, and a small firm whose product her own office switched to. And she picks two solid, middling companies in businesses she can explain to her daughters in one sentence. Roughly ₹50,000 in each.

Now watch the same two years. When results come out, six companies is a load she can carry - she reads each one over a quiet evening. And because she's actually looking, she catches things. One of her fast growers starts borrowing heavily and its growth stalls; she notices the warning in the results, thinks hard, and sells before it falls far - saving most of that ₹50,000. When a rough patch hits the whole market and her snack company drops 30%, her two stalwarts barely move, cushioning the blow so her total savings dip only a little. She ends the two years knowing exactly what she owns, why she owns it, and how each one is doing.

Line up the two Aarohis. The first owned twenty-two companies and understood none; a few quietly rotted and cost her ₹28,000 she never saw leave. The second owned six companies and understood all six; she caught trouble early and let her sturdy plants steady the ship. Same money, same life. The only difference was matching the number of plants to the size of the farmer.

Let's go one layer deeper, because why the mix helps is worth really seeing - it's not just a feeling of safety, it's arithmetic. illustrative

Picture a small, honest portfolio of five companies, ₹1,00,000 each, ₹5,00,000 in all. Two are fast growers (exciting, wobbly), two are stalwarts (boring, sturdy), and one is a steady middling company. Now imagine a genuinely rough year for the fast, exciting kind of business - the sort of year that comes along now and then.

The two fast growers have a terrible time and fall 40% each: ₹1,00,000 becomes ₹60,000, so together they drop from ₹2,00,000 to ₹1,20,000 - a loss of ₹80,000. If your whole farm had been fast growers, that same rough year would have taken ₹2,00,000 down toward ₹3,00,000 and your heart would be in your mouth. But it isn't a whole farm of them. Meanwhile the two stalwarts, being sturdy, barely notice the storm - they even edge up 5% each, from ₹2,00,000 to ₹2,10,000, a gain of ₹10,000. And the steady middling company holds flat at ₹1,00,000.

Add it up. The exciting plants lost ₹80,000; the sturdy ones and the steady one together gained ₹10,000. Your ₹5,00,000 farm is now worth about ₹4,30,000 - down roughly 14%, not the gut-wrenching 40% you'd have felt if everything you owned was the wobbly kind. That's the cushion, in plain rupees. The boring companies didn't win any prizes that year. Their whole job was to stand up while the exciting ones fell over, so the loss you actually feel is a bruise instead of a break.

And notice the flip side, which is just as important. In a good year - when the exciting businesses do brilliantly and a fast grower doubles - it's the stalwarts that plod along and "hold you back" a little. That's fine. That's the deal. The sturdy plants give up some of the upside so that the exciting ones can be exciting without being able to sink you. You're not trying to make every plant win every year. You're building a farm that survives every year and leaves room for a few plants to grow tall. The mix is what lets you sleep at night while still keeping a real shot at a big winner.

So what is the right number - five, eight, twelve? The honest answer is: the number isn't a target you aim at, it's a result that falls out of two simple questions you ask yourself honestly.

The first question is: how many company stories can I truly keep up with? Not "how many could I buy," but "how many can I read on, think about, and notice trouble in, given my real life?" A busy parent with a job might honestly manage five or six. Someone who finds this genuinely fun and spends weekends on it might manage a dozen. There's no shame in a small number - a small, well-watched farm is a good farm. The shame is in owning more than you can watch and pretending that's safety.

The second question is: do I understand what each of these businesses actually does? This is where a quiet rule slips in. You should only be counting companies whose business you can explain simply - how it makes money, who buys from it, what would hurt it. A company you don't understand isn't really something you can "follow," because you wouldn't know good news from bad even if you read it. You don't have to understand every business in the world - you have to know, honestly, the edge of what you do understand, and keep your companies inside that edge, because a business you can't explain is one whose troubles you'll never see coming. So the number you can follow is really the number you can follow and understand. Those two fences together - attention and understanding - draw the size of your farm for you.

This is a freeing way to think, once it clicks. You stop chasing a magic number and start listening to your own capacity. Some years your farm is five plants; some years, as you learn more and find more time, it's nine. The number breathes with you. What never changes is the rule underneath it: never own a plant you can't tend, and never plant one you can't name.

The slip here is sneaky, because it doesn't feel like a mistake - it feels responsible. Almost nobody over-crowds their farm out of greed. They do it out of worry. Every time they hear about an exciting company, a small voice says, "Better own a bit of that too, just in case," and one more plant goes in the ground. Adding a company feels like doing something careful and grown-up. So the list creeps from six to twelve to twenty-five, one worried little "just in case" at a time.

But past the point where you can tend them, every extra company doesn't add safety - it subtracts it, by thinning the attention on everything you already own. There's even a nickname for over-doing it: turning good diversifying into diworsifying - spreading so wide that the new names add risk and confusion without adding any real understanding. The twentieth company you can't watch isn't a safety net under the other nineteen; it's just a nineteenth plant you'll now water even less. You've swapped the deep safety of knowing your companies for the shallow, false comfort of a long list.

Here's a worry that stops people building a small, careful farm: "If I only own six companies, how will I ever do really well? Don't I need lots, to have a chance at a big winner?" It feels right, but it has the truth backwards, and this is one of the loveliest facts in all of investing.

Over many years, if you hold good companies, something surprising happens to the scoreboard: nearly all of your total gain comes from just a handful of your companies - sometimes one or two - that quietly grow enormously. The rest do fine, or little, or nothing much. You don't get rich because all your plants grew tall. You get rich because two of them grew into trees, and you were still holding them when they did. Across a long stretch, a few big winners will drive almost all of your total gain while the rest barely move - so the whole game is to hold enough good companies that you have a winner or two, and then not chop them down early to book a small quick profit.

Let's feel it in rupees. illustrative Say Aarohi's six companies, each starting at ₹50,000, run for ten years. Four of them just plod: two roughly hold their ₹50,000, two grow gently to about ₹80,000 each. One stalwart does nicely, doubling to ₹1,00,000. And one fast grower - the snack brand she understood and kept watching - turns out to be a real tree: over ten years it grows tenfold, from ₹50,000 to ₹5,00,000. Add the farm up. The four plodders and the doubling stalwart together are worth about ₹3,40,000; the single tree alone is worth ₹5,00,000. One company out of six carried more than half the whole result. Her ₹3,00,000 farm became roughly ₹8,40,000 - and most of that leap came from a single plant she didn't dig up.

Now see why the small, watched farm and the "few winners" fact fit together like two halves of one lock. You cannot know in advance which of your six will be the tree - if you knew, you'd own only that one. So you hold a handful of good ones to make sure a tree is somewhere in your farm. But holding it isn't enough; you have to be watching closely enough to have the nerve to keep it while it grows, and to not panic-sell it after it merely doubles. The person with thirty unwatched names might well own a future tree - and then chop it down for a quick gain, or never even notice it, because it was lost in the crowd. The small farmer, who knows each plant, is the one who actually gets to keep her tree until it's tall. A few winners carry everything - and you only keep your winners if you're close enough to recognise them.

Now the honest part, because even a good rule breaks if you push it too far.

The first danger is shrinking too much. "Own only what you can follow" does not mean "own just one company you follow obsessively." If your whole ₹3,00,000 sits in a single business - even one you understand perfectly - then the day that one business hits real trouble, your entire savings hit trouble with it, and no amount of watching can undo a collapse you're fully exposed to. Following closely lets you notice danger; it doesn't make you immune to it. So the number can be small, but it shouldn't be one or two. A handful - enough that no single failure can wreck you - is the sturdy middle. Small enough to tend, but not so small that one storm flattens the farm.

The second danger is fake spreading. You might own six companies and feel mixed, while all six are really the same bet in different clothes - six different housing-related companies, say, that all soar and sink together with the property market. That's not a mixed farm; it's six of the same tall plant, and one storm takes them all. Real mixing means the companies do different things, so their good and bad years don't all line up. Count not just how many you own, but how many genuinely different stories you're betting on.

And a third, quieter caution. "Hold only what you can follow" assumes you're honest about what "following" means. Glancing at the share price in an app is not following - the price bounces around for a hundred silly reasons and tells you almost nothing about whether the business is healthy. Real following means reading the actual results, understanding whether profits and debts are moving the right way, and checking that the reason you bought still holds. If your "following" is just watching a number wiggle, then even three companies is more than you're truly tending. The point of this whole chapter isn't a magic headcount. It's to match the size of your farm to the size of your real care - and to be brutally honest about how much care that is.