Hidden Concentration: How a Long Ticker List Can Hide a Single Bet

Diversification is not measured by the length of your ticker list. It is measured by the number of independent reasons a portfolio can rise or fall. If every holding depends on the same thing — the price of a commodity, the rouble exchange rate, the decision of a single controlling owner, the key rate — then however many lines the account statement shows, the portfolio carries one risk. That is hidden concentration: a formally broad portfolio that is in fact a single bet, spread across several accounting entries.

What diversification is not

A common misconception is to treat a portfolio as protected because it holds many issuers and none of them takes up a large share. That arithmetic defends against exactly one kind of trouble: the failure of a specific company — a derailed project, an accident, a court ruling, the departure of management. This is a real risk, and splitting it across issuers genuinely works.

But on the Russian market, most of the movement in price is explained not by the fate of an individual company but by shared factors. Export revenue, the rouble rate, the cost of money, tax and tariff policy — these move whole groups of securities in step. Splitting a position into pieces inside one such group reduces how visible the risk is, not how large it is.

One factor under several tickers

Look at your portfolio not as a list of names but as a set of answers to the question "where does the revenue come from?" An oil producer, a gas exporter, a metals group and a fertiliser maker sit in different sectors and on different instrument pages: {{instrument:LKOH}}, {{instrument:GAZP}}, {{instrument:GMKN}}. But all of them earn in foreign currency, bear costs mostly in roubles, and depend on global demand. A strengthening rouble hits all of them in the same direction, at the same moment.

The mirror image is the domestic circuit. A bank, a retailer, a telecom operator and a developer all depend on the key rate and on consumer demand. The bank transmits it through net interest margin and loan book quality: a multiple such as 3,77 will live by its own logic, but the direction of the broad move is set by the same rate that drives the developer. Assembling a portfolio "from different sectors" while staying inside one circuit is an ordinary mistake.

A useful exercise: write one sentence next to each holding describing what would have to happen in the world for it to appreciate. If the sentences repeat, so does the risk. The equity instrument list and issuer reporting supply the raw material for that check — revenue broken down by sales market and by currency is visible in the statements.

One owner, one decision

The second source of hidden concentration is ownership structure. Several issuers may belong to the same group, sit inside one holding company, or share a single controlling shareholder, the state included. Dividend policy, the extraction of profit, the reshuffling of assets inside the group and the relationship with the regulator then become a common factor. One decision by the owner repriced several of your holdings at once.

Dividend dependence deserves a separate look. If the portfolio's expected cash flow rests on payouts from a narrow group of issuers, a change in their policy is not a blow to part of the portfolio — it is a blow to its entire income function. Upcoming payouts: {{dividend_calendar|limit=5}}; the full picture sits in the dividends section and the payout calendar. Record dates are a separate mechanism, covered in the piece on the shareholder register and the ex-date.

Concentration at the exit

There is a form of concentration you cannot see while the market is calm: every position leaves through the same door. Under stress, correlations measured over quiet periods stop describing reality — everything is sold, and second-tier names lose their bid simultaneously. A portfolio can be spread neatly across issuers and still be entirely concentrated in an illiquid segment. On the mechanics, see liquidity: why people only notice it once it runs out and who holds the order book when nobody is trading.

{{callout:warning}}Correlation measured in a calm period cannot be carried over to a stressed one. Check not how your holdings behaved on average, but how they behaved on the days of the sharpest market declines.{{/callout}}

Funds do not always add what the portfolio lacks

A broad-market mutual or exchange-traded fund looks like the cure for concentration, but Russian indices are themselves tilted towards commodity exporters and the largest banks. Buying such a fund on top of a portfolio of the same names does not diversify an investor — it doubles the bet already in place. Before adding a fund, inspect its composition in the funds section and compare it with what the account already holds.

A genuine widening of the factor set usually comes from a different asset class, not from another security in the same one: the debt market, and OFZ in particular, respond to the rate differently from equities, and through different mechanics.

How to audit a portfolio by factor

First, write down the revenue source for each position: currency export or domestic demand, commodity cycle or regulated tariff.

Second, note who the controlling owner is, and whether any positions share an owner or a regulator.

Third, note how quickly each position could be closed without conceding on price.

Fourth, add up weights not by ticker but by the groups you have just formed. The weight of the largest group is the true size of your main bet. Comparing valuations inside a group is easier with multiples that account for debt — see EV/EBITDA instead of P/E.

The cost of rebuilding

Reducing concentration is not free. Selling an appreciated position creates a tax base, and the rules for determining it are set by statute — 13%, with the details in the basics of investor income tax and in the piece on when a tax return is required. Add the spread and transaction costs, and it becomes clear that concentration is better trimmed by a rule applied at entry than by an emergency clean-up afterwards. When a rebuild is justified and when it is merely fidgeting is examined in the material on changing strategy.

What this material does not give you

There is no ready-made coefficient here that would declare a portfolio sufficiently diversified: no such threshold exists, and this platform does not publish numeric correlations between specific securities in this material. What it does provide are instrument pages, issuer reporting, the corporate events calendar and news, from which the factor structure of a portfolio can be assembled by hand. Terminology lives in the glossary. A change in the number of shares outstanding, incidentally, has nothing to do with concentration: splits and reverse splits change the count, not the risk.