Concentration Risk in PMS: How Many Stocks Is Too Many?

If you've compared even two or three Portfolio Management Services, you've probably noticed something that mutual fund investing never prepares you for: PMS managers hold very few stocks. Where a diversified equity mutual fund might spread your money across 50, 60, or more companies, a typical discretionary PMS strategy in India concentrates it into somewhere between 15 and 20 names. Sometimes fewer.

For a first-time PMS investor, that can feel unsettling. Isn't "don't put all your eggs in one basket" supposed to be rule number one? The honest answer is more nuanced: concentration is a deliberate design choice built into how PMS works, and it can be a genuine source of outperformance  but only within limits, and only if you understand where those limits sit. This piece breaks down concentration risk in plain terms: what it is, why PMS portfolios are built this way, how much concentration is actually reasonable, and how to evaluate it before you commit ₹50 lakh or more to a strategy.

Concentration risk is the risk that a portfolio's performance depends too heavily on a small number of holdings  individual stocks, a single sector, or a narrow theme  so that one bad outcome does outsized damage to the whole. As Britannica Money's overview of concentration risk puts it, this vulnerability can show up through individual stocks, specific sectors, single asset classes, or geographic regions, and it's typically managed by periodically checking allocations and trimming positions that have grown too large.

In a PMS (Portfolio Management Service), this isn't a hidden flaw  it's structural. Unlike a mutual fund, where your money is pooled with thousands of other investors' money into one collective scheme, a PMS holds securities directly in your own demat account. The SEBI Investor Portal's guide to Portfolio Management Services describes this as direct ownership of stocks and other assets in the investor's own name, managed at the discretion of a professional portfolio manager. That direct-ownership structure is exactly what lets a manager run a tight, high-conviction book of 15–20 stocks instead of the wide, index-like basket a pooled mutual fund typically needs for liquidity and scale.

So the real question isn't "does my PMS have concentration risk"  it almost certainly does, by design. The real question is how much concentration is appropriate, and whether the specific PMS you're evaluating sits inside or outside a reasonable range.

PMS in India was never built to be a mass-market, small-ticket product. SEBI's own regulatory history makes this explicit. In 2019, SEBI raised the minimum PMS investment from ₹25 lakh to ₹50 lakh  a change Business Standard reported was intended to restrict access to investors better equipped to understand and absorb the risks that come with this kind of product  concentration chief among them. Related Business Standard coverage of the same regulatory shift noted that PMS portfolios typically contain 15–20 stocks, compared to mutual funds' 50–60+ holdings, and that this freedom to concentrate is precisely what gives a skilled manager room to generate higher alpha  at the cost of higher volatility.

That trade-off is still being actively shaped by regulation today. As of July 31, 2026, portfolio managers in India collectively oversee a Grand Total AUM of roughly ₹44.1 lakh crore, according to SEBI's published assets-under-management statistics with discretionary PMS (the concentrated, manager-led kind this article focuses on) accounting for the large majority of that figure. In July 2026, SEBI also released a consultation paper on a comprehensive review of the Portfolio Managers Regulations, proposing a new lower-entry, mutual-fund-only PMS tier at a ₹25 lakh minimum, sitting alongside the existing ₹50 lakh discretionary PMS category. Read together, these signal a regulator that sees concentrated, stock-picking PMS and a more diversified fund-of-funds-style offering as genuinely different products for different risk appetites  not the same thing at two price points.

Beyond regulation, concentration is also a philosophy. The argument, associated with generations of value-oriented fund managers, is straightforward: if a manager genuinely has an edge in identifying good businesses, diluting that edge across 50 or 60 "good enough" ideas defeats the purpose of paying for active management in the first place. A concentrated portfolio forces a manager to size positions according to actual conviction rather than spreading capital thin to look diversified on paper. Whether that philosophy pays off depends heavily on manager skill  which is exactly why concentration risk and managerial risk are so closely linked, a point we'll return to shortly.

Here's the part most PMS marketing material skips over: diversification has diminishing returns, and past a certain point, adding more stocks barely reduces risk at all.

A widely cited study from the CFA Institute's Enterprising Investor blog, which built random equally-weighted portfolios across NASDAQ and NYSE data from 2005–2020, found that for large-cap portfolios, there is little to be gained by diversifying beyond roughly 15 stocks. Going from 10 stocks to 40 stocks in a large-cap portfolio reduced volatility by only about 3 percentage points  a small improvement for tripling or quadrupling the number of holdings you have to track. Small-cap portfolios behaved differently, needing closer to 26 stocks to reach a similar diversification plateau, which is a useful reminder that "the right number" genuinely depends on what a strategy is invested in, not just how many names appear on the statement.

This is a big part of why the 15–20 stock range that most PMS strategies use isn't arbitrary. For a large- or multi-cap focused strategy  which describes a large share of Indian PMS offerings  that range sits right around the point where each additional stock stops meaningfully reducing risk and starts diluting the manager's best ideas instead. Vanguard's own investor education on diversification makes a similar point in more general terms: diversification helps smooth returns, but it's a tool for managing risk, not a guarantee against loss, and more holdings do not automatically mean a safer portfolio if those holdings are correlated with each other.

The flip side matters just as much. Below roughly 10 stocks, portfolios show much wider dispersion of outcomes  industry research cited across multiple PMS-focused publications has pointed to 10-stock portfolios historically ranging from roughly 3.7% to 21.3% in outcomes over comparable periods, a spread far wider than what larger baskets show. That's the real shape of concentration risk: not a single cliff edge, but a curve that gets steeper the fewer stocks you hold.

There's no single regulatory number that defines "too concentrated" for a PMS  SEBI doesn't mandate a minimum stock count. But combining the diversification math above with how PMS strategies are actually built in practice gives a workable framework.

Portfolios with fewer than 10 holdings carry meaningfully higher single-stock risk  one earnings miss, one regulatory action, one governance scandal can move the entire portfolio's return by several percentage points in a single quarter. This isn't automatically wrong for an investor who deliberately wants a high-conviction, high-volatility strategy and has the risk capacity to absorb sharp drawdowns. But it demands a much higher bar of trust in the manager's stock-picking skill, since there's very little room in the portfolio to absorb a wrong call.

This is the range where the majority of Indian PMS strategies land, and for good reason  it roughly matches the point where large-cap diversification benefits plateau, while still leaving room for genuine conviction-weighted positions. A well-run 15–20 stock portfolio should show thoughtful position sizing (the largest few holdings sized meaningfully larger than the smallest, reflecting real conviction) rather than 20 nearly-equal-weighted stocks that mimic an index without admitting it.

A PMS marketed as "concentrated" or "focused" that actually holds 30, 40, or more names deserves scrutiny for a different reason: closet indexing  charging active-management fees while quietly delivering index-like returns. CNBC's coverage of closet indexing cites research recommending investors look for managers with active share above 80% for large-cap strategies and above 90% for small-cap strategies  a measure of how different a portfolio actually is from its benchmark index, independent of raw stock count. The research found that only a minority of funds clear even the 80% threshold, which is a useful reminder that stock count alone doesn't tell the whole story; a 20-stock portfolio that closely tracks the Nifty 50's largest weights isn't meaningfully concentrated in the way that matters.

Concentration risk doesn't exist in isolation  it interacts with, and often amplifies, the other risks that come with a PMS investment:

• Managerial risk  with fewer positions absorbing the impact of any single mistake, a concentrated portfolio is far more exposed to a manager's behavioral biases or a genuinely wrong call than a diversified one.
• Liquidity risk  a concentrated position in a mid-cap or small-cap stock can be difficult to exit quickly without moving the price, compounding losses in a downturn.
• Sector risk  concentration by stock count can hide concentration by sector; 18 stocks spread across six sectors is a very different risk profile from 18 stocks clustered in two.
• Market risk  systematic, broad-market moves (like the roughly 35% Nifty50 decline during the initial COVID-19 shock, cited in industry PMS risk overviews) hit concentrated and diversified portfolios alike, but a concentrated portfolio has less room to offset the damage internally.

Evaluating a PMS purely on "how many stocks does it hold" misses this interaction. The number is a useful starting filter, not the whole due-diligence process.

A decade ago, checking concentration risk meant manually totting up position weights from a quarterly PDF statement  tedious enough that most investors simply didn't do it. That's changed. Custodian-linked reporting, direct demat visibility, and portfolio-aggregation platforms now let investors see position-level weights, sector exposure, and cross-portfolio overlap in something close to real time, rather than after the fact.

This shift matters most for investors who hold more than one PMS or AIF at once  a common pattern among HNIs and family offices consolidating wealth across managers. Two portfolios that each look reasonably diversified in isolation can turn out to share the same five or six large-cap names, creating hidden concentration that neither manager's own reporting would ever flag, because neither manager can see the other's book. Spotting that kind of cross-portfolio overlap by hand, across multiple PDF statements and fact sheets, is exactly the kind of tedious, error-prone work that modern AI-assisted portfolio tools are increasingly built to automate.

It's worth being fair to the other side of this trade-off. A well-constructed concentrated portfolio offers real benefits, not just risk:

• Higher alpha potential  a manager's highest-conviction ideas get meaningful weight instead of being diluted across dozens of average ones.
• Easier to actually understand  with 15–20 holdings, an investor can reasonably follow what they own and why, unlike a 60-stock mutual fund portfolio most investors never fully review.
• Harder to fake  genuine concentration is difficult to sustain while quietly hugging a benchmark, so it's a signal (though not a guarantee) of real active decision-making.
• Sharper manager focus  fewer positions mean more research depth per holding rather than shallow coverage spread thin across a large universe.
• Full transparency at the stock level  because a PMS holds securities directly in your own demat account, you can see exactly what you own and how concentrated it is, unlike a pooled fund where the same information takes longer to surface.
• More deliberate portfolio changes  fewer positions generally mean more considered entry and exit decisions rather than high-frequency churn across a large basket.

None of this cancels out the real costs of concentration. Four stand out:

• Amplified drawdowns. A poor call on even one or two holdings has an outsized effect on overall returns in a 15–20 stock portfolio compared to a 50–60 stock one. Fidelity's investor education on diversification frames this plainly: spreading investments helps limit the damage any single holding can do, which is precisely the cushion a concentrated portfolio gives up.
• Wide return dispersion. As covered above, smaller portfolios show much wider ranges of possible outcomes than larger ones  the same structure that can outperform can also underperform by a wide margin.
• Greater dependence on manager skill. With less room to absorb a mistake, concentration risk and managerial risk rise together; you are making a larger bet on one person's or one team's judgment.
• Less natural smoothing across market cycles. Fewer sectors and themes represented means less internal offsetting when one part of the market underperforms  a concentrated portfolio leans more heavily on the manager actively rotating exposure rather than diversification doing that work passively.

This is exactly the gap PMS Sahi Hai was built to close. As India's first AI-powered PMS & AIF marketplace, PMS Sahi Hai exists on the premise that hard-earned wealth shouldn't rely on random advice  and "this PMS holds 18 stocks" is not, on its own, advice. It's a data point that needs context.

That's where Nyra, PMS Sahi Hai's AI Wealth Compass, comes in. When you connect your existing portfolio, Nyra's portfolio analysis engine looks past the headline stock count to reveal the details that actually determine your risk: hidden overlap between PMS and AIF strategies you already hold, sector concentration that spans multiple portfolios, and duplication that quietly turns three "diversified" investments into one large, correlated bet. Rather than leaving you to manually cross-reference fact sheets from different fund houses, Nyra evaluates strategies across a tracked universe of 1,000+ PMS and AIF options and surfaces the ones that actually fit your risk profile  whether that means a genuinely high-conviction 15-stock strategy for an investor with the risk appetite for it, or a comparatively steadier option for one who doesn't. The PMS comparison tool on Nyra lets you put stock count, sector weights, and track record for multiple strategies side by side, instead of toggling between PDFs.

For an investor trying to answer this article's core question  "is this PMS's concentration too much for me?"  that's a materially better starting point than reading one fund's marketing brochure in isolation. If you're newer to the product category altogether, PMS Sahi Hai's own PMS FAQs are a good place to fill in the basics before diving into manager-by-manager comparisons.

Concentration risk in PMS isn't something to eliminate  it's something to size correctly. A 15–20 stock portfolio sits close to where the math of diversification stops paying off for a large-cap strategy, which is why most PMS offerings land there. But "most PMS land there" doesn't mean every PMS you're evaluating handles it well, and no single number  12 stocks, 18 stocks, 25 stocks  is automatically right or wrong without understanding sector spread, position sizing, manager track record, and how it fits alongside whatever else you already hold.

That last part is where most investors get stuck, simply because comparing fact sheets across managers by hand doesn't scale past two or three PMS strategies. PMS Sahi Hai and Nyra were built to remove that friction  comparing, evaluating, and monitoring PMS and AIF strategies against your actual risk profile and existing holdings, not just their marketing decks. If you're weighing how much concentration is right for your portfolio, you can start with Nyra to see exactly where your current holdings stand before adding another concentrated bet on top of them.