Never Sell
How Diversified, Systematic Risk Strategies Win in the Long Run
In Part 1 of this series, we argued that the greatest challenge facing active investors is knowing when to sell. Many investors, even professionals, struggle with sell decisions – often holding losers too long or selling winners too early, driven by emotion or misguided timing attempts. The result is frequently subpar performance. In this Part 2, we explore a powerful antidote: building a diversified portfolio focused on capturing systematic risk that largely eliminates the need for reactive selling . . . ever. We will show how a “never sell” approach – holding through volatility and only rebalancing periodically to maintain targets or adjust for life changes – can lead to better outcomes. This doesn’t mean neglecting the portfolio; it means trusting diversification and long-term risk premia rather than trying to time exits.
We draw on historical data, academic research, and real-world evidence to demonstrate the benefits of broad diversification and systematic risk exposure. In contrast, we examine how private deals, concentrated bets, or illiquid investments depend on timing an exit just right – the very pitfall most investors wish to avoid. Finally, we conclude with an example: Quantor’s Global 500 Strategy, a globally diversified, systematic-risk-driven approach that exemplifies the “never sell” philosophy in practice.
The Selling Dilemma in Active Investing
Active investors pride themselves on stock-picking and market timing, but deciding when to sell is notoriously difficult. Behavioral finance studies document pervasive mistakes: investors often sell winning investments too early and hold onto losers too long, a bias known as the “disposition effect.” In practice, this means many people lock in small gains on stocks that kept rising, yet refuse to cut losses on positions that continued falling – essentially the opposite of the classic “buy low, sell high” advice.
Even professional money managers struggle with timing. Overwhelming evidence shows that most active funds underperform broad market benchmarks over time, in part because of poor trading decisions. According to S&P’s latest SPIVA analysis, roughly 90% of active equity fund managers lagged their index over a 10-year horizon. In other words, only about one in ten fund managers beat a simple passive index over a decade – a striking indictment of the typical active approach. This underperformance suggests that many managers either bought the wrong securities, sold at the wrong times, or incurred costs that eroded returns. As one market observer noted, “The stock market is hard to beat because picking the winning stocks is hard. Index funds own them regardless.”
Real-world investor behavior data further highlight the cost of bad selling decisions. Studies by DALBAR and others have found that the average investor consistently earns much less than the market’s return, largely due to ill-timed trades – buying high in euphoric markets and selling low in a panic. For example, some analyses show the average equity investor underperforming the S&P 500 by several percentage points annually because of such timing errors. In Part 1, we discussed how chasing hot stocks and then failing to sell before downturns can trap investors in losses. The key takeaway was that knowing when to sell is perhaps the hardest part of active investing – and getting it wrong exacts a heavy toll on performance.
If selling at the right moment is so challenging, maybe the answer is not having to sell in the first place. That is, structuring a portfolio in such a way that you can confidently hold it through market cycles, without scrambling to escape at every sign of trouble. This is where a diversified, systematic-risk-focused strategy comes in – effectively turning the traditional investing approach on its head. Rather than constantly asking “Should I sell now?”, the diversified long-term investor asks, “Why sell at all?” (except for disciplined rebalancing or a genuine need). In the sections below, we examine how such an approach works and why it is supported by decades of finance research.
Systematic vs. Idiosyncratic Risk: Why Diversification Lets You Hold Longer
To understand the power of a “never sell” approach, we must distinguish between systematic risk and idiosyncratic risk. Systematic risk (also called market risk) refers to broad economic and market forces that affect many assets at once – for example, interest rate changes, recessions, or global events. This type of risk cannot be eliminated by diversification, since it’s baked into the entire market. Idiosyncratic risk (or unsystematic risk), on the other hand, is the risk specific to a single company or a small group – such as a CEO scandal, a failed product launch, or industry-specific regulations. Crucially, idiosyncratic risk can be mitigated (or almost entirely eliminated) through diversification. By holding a broad basket of investments, the unique ups and downs of any given asset tend to cancel out, leaving mainly the market-driven risk.
Why does this matter for a “never sell” strategy? Because investors are only compensated with higher returns for bearing systematic risk, not for bearing avoidable idiosyncratic risk. In finance theory (CAPM and beyond), the market rewards investors for taking on market risk – for example, stocks in general have historically returned more than cash or Treasury bills as compensation for economy-wide risks. But there’s no extra reward for the risk of an individual stock beyond what the market requires; that risk is considered unnecessary. As one textbook put it, “The total risk for a well-diversified stock portfolio is basically equivalent to systematic risk,” since diversification can eliminate the rest. Investors are not rewarded for taking idiosyncratic risk, so rationally one should diversify it away.
This principle has profound implications. A diversified portfolio – for instance, a broad index of hundreds or thousands of stocks – will have far less company-specific risk than a concentrated portfolio. With diversification, the portfolio’s fate doesn’t hinge on any single holding; even if one stock blows up, the overall impact is minor. Therefore, you rarely face a situation where you must sell out of fear that one position could go to zero. In a concentrated portfolio, by contrast, if one of your few stocks encounters trouble, you might feel forced to sell quickly to avoid ruin. The diversified investor can afford to be patient and ride out fluctuations, because the only risks being taken are systematic ones that tend to be temporary and mean-reverting at the portfolio level (e.g., overall market swings).
Academic research backs this up. A famous study by Brinson, Hood, and Beebower (1986) found that a portfolio’s asset allocation – essentially its exposure to broad asset classes or systematic market risks – explained about 93.6% of the variation in its returns, whereas security selection and market timing (idiosyncratic bets) played only minor roles. Follow-up research confirmed that the dominant driver of portfolio performance is exposure to the market itself (“a rising tide lifting all boats”). In other words, the returns you achieve are overwhelmingly determined by what you’re invested in (stocks vs. bonds vs. other assets) rather than which specific stock you picked or when you moved in and out. This reinforces the idea that aligning with broad systematic risks – and staying invested in them – is more important than nimble trading. It also implies that if you own the market (through a diversified index-like portfolio), you position yourself to earn the market’s returns without needing clever timing.
Perhaps the most dramatic illustration of the value of diversification comes from Hendrik Bessembinder’s research on long-term stock returns. He found that, historically, most individual stocks delivered very poor returns, often losing money over decades, while a very small fraction of stocks accounted for virtually all the wealth creation in the equity market. In fact, just 4% of companies accounted for all the net gains in the U.S. stock market from 1926 to 2016, whereas 4 out of 7 stocks (roughly 57%) underperformed even one-month Treasury bills over their lifetimes. The implications are striking: if your portfolio consisted of only a few stocks, the odds of picking one of those big long-term winners were low, and you stood a good chance of holding underperformers. A broadly diversified investor, however, will almost inevitably own those rare big winners (by owning the whole index), and the gains from the winners more than make up for the many mediocre or losing stocks. As Ben Carlson summarized Bessembinder’s findings: “Most stocks are crap over the very long run but the biggest gainers more than make up for the losers.” Index funds are hard to beat for this very reason – they ensure you participate in the successes that drive the market’s return, something a concentrated picker could easily miss.
The lesson is that diversification converts the unpredictable fate of individual holdings into the more reliable progress of markets as a whole. A well-diversified, systematic portfolio doesn’t eliminate volatility or downturns – you will still experience market-wide drops – but it does eliminate the need to constantly monitor and jettison failing individual bets. You aren’t worried that one bad earnings report will torpedo your financial plan; your fortunes rise and fall with the global economy and innovation at large, which have historically trended upward over time. This sets the stage for a “never sell” mindset, because you have confidence that the broad market will recover from declines (as it always has), even if some individual companies do not. In the next section, we’ll see just how powerful staying invested with a portfolio comprised of systematic risk can be over the long term.
Riding Out Volatility: The Long-Term Benefits of “Never Selling”
One of the greatest advantages of a diversified, systematic-risk-focused portfolio is that it enables you to hold through market volatility instead of trying to get in and out. History strongly favors the patient, stay-invested approach. Despite regular corrections and occasional severe bear markets, the long-term trajectory of diversified markets has been overwhelmingly positive, rewarding those who didn’t sell during the storms. Let’s consider some key historical evidence:
Over long horizons, diversified equities have always recovered. In the U.S. stock market, there has never been a 20-year period with a negative total return. Even including the worst market crashes and wars of the past century, an investor who held a broad index of U.S. stocks for any 20-year span came out ahead. Losses have occurred over shorter periods (e.g., 1 or 5 years), but the odds of losing money shrink as your holding period grows. From 1926 through 2024, 5-year rolling returns for the S&P 500 were negative only about 4% of the time, and 10-year returns were negative just around 0–5% of the time. Meanwhile, the average 20-year outcome was strongly positive. The global equity market has shown similar resilience when held over long horizons. This means that if your portfolio is diversified across the market and you can keep a long view, the probability of needing to sell to avoid loss approaches zero.
Bull markets have far outweighed bear markets. Stocks do experience bear markets (declines of 20% or more), but these downturns tend to be short and relatively shallow compared to the ensuing bull markets. Since 1928, the S&P 500 has undergone 27 bear markets (as of early 2025) and 28 bull markets. The average bear market saw stocks fall about 35% from peak to trough, lasting roughly 9.6 months. In contrast, the average bull market gained about 112% and ran for 2.7 years. Put simply, the market has spent far more time climbing than falling, and the gains in the bull runs have greatly exceeded the losses in the bears. Over the last 95 years, stocks have been rising (in bull markets) roughly 78% of the time, while bear markets only account for about 21% of all days. This asymmetry rewards those who stay in the market: if you sold during a bear, you risk missing the long upward swing that follows. But if you held your diversified portfolio through the downturn, history suggests new highs eventually arrive, erasing the temporary losses.
The best market days often cluster around the worst days – making timing nearly impossible. A striking statistic: about 42% of the market’s strongest up days occurred during bear markets (when pessimism is high), and another 36% of the best days happened in the first two months of a new bull market – before it was clear that a bull market had begun. In other words, nearly 78% of the biggest positive days came either amid the fear of a downturn or very early in a recovery. Investors who panicked and sold during the downturns not only locked in losses but were likely on the sidelines when those huge up days arrived. Consider the last few decades: if you missed just the 10 best days in the U.S. stock market over a 30-year period, your overall return would have been cut roughly in half. And missing the top 30 days would have reduced your returns by an astonishing 83%. The message is clear: market rebounds are often swift and unpredictable, so trying to sell out and jump back in later is an enormous gamble. The far safer course is to stay invested through the turbulence, confident that the pain is temporary. As Hartford Funds put it, “the best way to weather a downturn could be to stay invested since it’s difficult to time the market’s recovery.” Reactive selling not only risks selling low, but also failing to buy back until prices are much higher.
Behavioral coaching – or the lack of need for it – is a benefit of “never selling.” Financial advisors often find their biggest value is in keeping clients from making rash decisions in volatile markets. A diversified systematic strategy, by its nature, encourages discipline: you know declines are normal and expected, not a signal that your strategy failed. This mindset can prevent common errors. For instance, during the 2020 pandemic crash and rapid rebound, investors who held a balanced portfolio and rebalanced ended up whole and ahead within months, whereas those who sold in March 2020 missed one of the fastest recoveries on record. Never selling proved far superior to trying to find the “right” moment to sell and then re-enter.
In sum, a globally diversified portfolio allows you to be a patient owner of the great enterprises of the world, rather than a trader trying to outwit other traders, which is a zero sum game by definition. The historical and academic evidence indicates that time in the market beats timing the market. By capturing the systematic risk premia – such as the equity risk premium, which has delivered on the order of 5–7% above inflation per year in the U.S. over the long run – a steady investor can build substantial wealth simply by not selling. In fact, from 1926–2023 the S&P 500 returned about 10.3% per year on average, despite all the crashes, wars, and recessions in between. That impressive long-term return was available to anyone who just bought a diversified equity basket and held on through the ride. Those who instead hopped in and out often fared worse (and incurred taxes and fees along the way). The benefit of the “never sell” philosophy is compounded growth – the longer you stay invested, the more your gains can compound. Legendary investor Peter Lynch once quipped, “Far more money has been lost by investors preparing for corrections, or trying to anticipate corrections, than has been lost in corrections themselves.” By not selling needlessly, diversified investors avoid being the ones who lose out by preparing for a crash that never came or that rebounded before they got back in.
The Contrast: Concentrated and Illiquid Investments Rely on Selling
To further appreciate the advantage of a diversified, hold-forever strategy, consider its opposites: private deals, concentrated bets, or illiquid investments. These types of investments often only produce a good outcome if you sell at the right time, underscoring the risk of a mistimed exit.
Concentrated stock positions (e.g., owning a large stake in a single company or a handful of stocks) can generate tremendous wealth if you happen to hold a big winner and if you sell near the peak. But the flip side is brutal: any single company can suffer a permanent decline (think Enron, or even less catastrophic examples like GE’s long decline). If you’re concentrated and your thesis goes wrong, you must decide when to cut your losses – not easy, as many will stubbornly hold a loser, hoping it comes back. Or if you’re lucky to have a winner (say your company’s stock soared), you face the dilemma of when to realize the gains. Many early investors in high-flying stocks held on too long and saw huge paper profits evaporate. For example, an investor concentrated in a tech stock during the dot-com boom who failed to sell before the bust gave up enormous gains. Success in concentrated investing often hinges on timely selling, because the risk is idiosyncratic and not diversified away. In contrast, a diversified index investor doesn’t need to pinpoint a selling point for any single stock; the natural churn of the index (companies entering and leaving) and the broad market trend take care of it. The index holder’s “exit strategy” is essentially never – unless a stock is removed from the index, which is rules-based. This makes investing far less stressful and less prone to behavioral mistakes.
Private equity and venture capital likewise illustrate the challenge of illiquidity and timing. These investments are illiquid by design – you commit capital for years, and returns are realized when a portfolio company is sold or taken public. Private investors must rely on a successful exit event; if a company never finds a buyer or has an IPO, its value may never be realized. Even for successful startups, exiting at the right time is crucial. Many unicorns saw their valuations surge on paper, only to come crashing down before an IPO (e.g., WeWork). Moreover, private equity funds often use strategic timing (selling companies during favorable market windows) to boost reported returns. If those windows close returns suffer. The individual private investor has little control here. By contrast, in a diversified public equity portfolio, you have liquidity and transparent pricing every day; you could sell, but crucially you don’t need a liquidity event to unlock value – the market continuously values your holdings. There’s no risk of being stuck in an asset that “looks valuable” but has no buyers on the open market. The freedom from having to find an exit at the perfect moment is a vastly under-appreciated benefit of public market diversification.
Real estate, collectibles, and other illiquid assets often require selling to realize gains as well. Take real estate. One might boast that a building’s value doubled, but that gain is only usable if the property is sold or refinanced. In illiquid markets, selling quickly at a fair price can be hard, especially during downturns. If you need to sell an illiquid asset at an inopportune time, you may suffer a significant impairment in value. In other words, you might have to accept a steep discount or no bids at all. By “never selling” a diversified portfolio, you avoid this predicament – you can typically raise cash by trimming a small portion in the liquid market, or better yet, you design your plan so that you aren’t forced to sell at all unless on your own terms. Illiquid investments can offer higher yields (an illiquidity premium), but that premium is only a benefit for an otherwise sound investment. For a bad investment, owning one that is also illiquid just compounds the problem by locking the investor in. In other words, if you made a mistake or circumstances changed, you’re stuck – a risk you largely avoid with a well-diversified, liquid portfolio which you can adjust gradually.
None of this is to say that private or concentrated investments have no place – many high-net-worth portfolios include some illiquid alternatives for diversification or alpha potential. But it’s important to recognize that those strategies inherently rely on timing and successful sales: the venture capitalist needs a lucrative exit, the property investor needs a strong market to sell into, the concentrated stockholder needs to monetize at peak value. These approaches, however, reintroduce the “when to sell” problem in a big way. They might generate superior returns if executed perfectly, but the penalty for getting the timing wrong can be severe. The diversified systematic approach, on the other hand, is forgiving. You don’t need to predict or execute perfect sells. You gain the “free lunch” of diversification, which reduces risk without reducing expected return, and you rely on the idea that broad economic growth and markets tend to rise over time. By minimizing idiosyncratic bets, you minimize the need for timely exits.
“Never Selling” ≠ Neglect: The Role of Rebalancing and Adjustments
It’s crucial to clarify that “never selling” does not mean one should never make changes to the portfolio. Buy-and-hold is not the same as buy-and-forget. Any long-term strategy requires periodic maintenance in the form of rebalancing, and portfolios should evolve as an investor’s life stage, goals, or risk tolerance change. The difference is that these adjustments are strategic and rules-based, not reactive market timing.
Rebalancing is the process of bringing a portfolio back to its target asset allocation (the mix of stocks, bonds, etc.) when market movements have caused it to drift. For example, imagine you decided on a 60% stocks / 40% bonds allocation. If stocks perform very well for a few years, your portfolio might become, say, 75% stocks / 25% bonds. To rebalance, you would sell some stocks (sell high) and/or buy bonds (buy low) to restore the 60/40 balance. This is a disciplined form of selling that has nothing to do with market outlook and everything to do with maintaining your risk profile. Vanguard illustrates that without rebalancing, a portfolio can become far riskier than intended: a 60/40 portfolio left untouched since 1989 would have drifted to about 80% in equities by 2021, dramatically altering its risk level. Rebalancing ensures you “sell” not because you’re scared of a crash, but because your winners have grown to become too large a portion of your assets. It enforces a “buy low, sell high” disciplined approach.
It’s worth noting that rebalancing can enhance returns in certain markets, a phenomenon known as the “rebalancing bonus.” This bonus arises from diversification: when you hold uncorrelated assets, periodically rebalancing between them can lead to higher compounded returns than a static buy-and-hold of each asset alone (because you are effectively buying dips and selling rallies). As one source puts it, “The rebalancing bonus stems from diversification, which is said to be the only ‘free lunch’ available to investors.” Not every period will reward rebalancing – if one asset class steadily outperforms everything else for a long time, a never-rebalanced portfolio would win out – but in many scenarios with ebb and flow, rebalancing adds value and controls risk. More importantly, it instills a systematic approach to selling: you trim assets that have done well (and thus likely become more expensive relative to others) and redeploy into assets that have become relatively cheap. This is the opposite of emotionally driven selling (which tends to sell what’s down and chase what’s hot). Rebalancing thus keeps you on track and prevents “neglect” of the portfolio without resorting to speculative moves.
Another form of justified selling is when your personal situation changes – not because the market changed. For instance, as you age and approach retirement or other major goals, it may be prudent to gradually shift to a more conservative allocation. That might involve selling some equities and buying more fixed income or cash equivalents to reduce volatility. Or if an investor discovers their risk tolerance isn’t as high as they thought (perhaps after living through a sharp downturn), they might restructure the portfolio to a level they can comfortably hold through thick and thin. These are strategic adjustments aligned with one’s risk profile and life plan, not knee-jerk reactions to market noise.
In all these cases, selling is done in a controlled, modest way. You are never liquidating your portfolio wholesale; you’re not trying to call a market top or bottom. Instead, you’re trimming and reallocating according to a plan. This stands in stark contrast to active trading, where sells are often driven by forecasts (“I think a recession is coming, better sell now”) or fear (“This stock is tanking, get me out!”). The systematic investor’s sells are more like routine portfolio “tune-ups,” like rebalancing a car’s tires – it’s maintenance, not an overhaul of the engine.
It’s also important to remember that diversified “never sell” portfolios will naturally have turnover without your intervention. For example, broad index funds periodically sell and replace components (companies that shrink or fail get removed, new successful companies get added). But this happens as part of index methodology – again, rules-based and not dependent on a manager’s whims. The investor holding such an index fund is effectively delegating the micro-level sell decisions to the index process, which has proven to be an efficient way to capture market returns.
Taxes and costs are another reason to minimize selling. High-net-worth investors are especially sensitive to capital gains taxes. A long-term, low-turnover strategy defers taxes, allowing more compounding. Frequent selling triggers taxable events and transaction costs, which can significantly drag down performance over time. By “never selling,” you keep more of your money working for you. Legendary investor Warren Buffett exemplifies this: he has often said his favorite holding period is “forever,” in part because it avoids unnecessary taxes and lets the power of compound growth do the heavy lifting.
In summary, “never selling” really means never selling for the wrong reasons. You still pay attention to your portfolio, rebalance periodically, and adjust as your circumstances require. But you don’t dump assets due to panic or market timing hunches, and you don’t need to sell to achieve your returns (unlike, say, a private equity deal that must eventually liquidate). Your mindset is long-term ownership of productive assets, not short-term trading. This disciplined approach can be liberating as it frees you from the futile task of calling market turning points and lets you focus on what truly matters – the alignment of your portfolio with your financial goals and risk comfort.
Embracing a Systematic, Globally Diversified Strategy
The evidence is compelling that a globally diversified, systematic-risk-focused portfolio enables investors to largely sidestep the perils of market timing and reactive selling. By spreading investments across broad asset classes and capturing the inherent risk premia, one can rely on the long-term upward trajectory of the market to do the work, rather than constantly having to make buy/sell decisions. This “never sell” philosophy – hold through volatility, rebalance as needed, but resist the urge to trade on noise – has been shown to improve outcomes for investors ranging from everyday 401(k) savers to sophisticated high-net-worth individuals. It turns investing into a game of patience and discipline rather than prediction.
For high-net-worth investors and advisors, implementing this approach often means adopting strategies that provide broad, transparent market exposure. One concrete example is Quantor Capital’s Global 500 Strategy, which exemplifies the principles discussed. This strategy invests in the 500 largest companies worldwide, thereby capturing the value created by major players across industries and regions. In doing so, it harnesses systematic global equity risk – effectively owning a slice of the world’s corporate giants. Such a portfolio is inherently diversified across geographies and sectors, reducing idiosyncratic risk. It does not rely on finding a “greater fool” at the right moment to sell to; instead, it builds wealth alongside global economic growth. Because it is rules-driven and broad-based, there’s little need for reactive trading – the strategy naturally holds through market cycles, making periodic adjustments (like rebalancing or index constituent changes) without emotional decision-making. In essence, the Global 500 Strategy is a modern, strategic way to get exposure to global systematic equity risk, aligning with the “never sell” ethos by allowing investors to participate in long-term growth without being bound to the timing of any single exit.
It’s important to note that “never selling” doesn’t imply a static portfolio or one devoid of risk and return enhancing tools. Strategies like the Global 500 may use smart portfolio construction, factor tilts, or risk management overlays – but these are employed in service of enhancing the risk/return profile while still avoiding discretionary in-and-out trading. The core idea is still to hold a portfolio you are comfortable with indefinitely. By doing so, you remove one of the biggest failure points in investing (bad sell decisions) and instead focus on the structural drivers of return – asset allocation, diversification, and patience.
In closing, the shift from an active trading mindset to a diversified “never sell” mindset can be transformative. It channels the natural growth of markets and the power of compound interest to the investor’s advantage, minimizing regret and maximizing the probability of reaching one’s financial goals. Academic research, market history, and practical experience all point toward the same conclusion: the less you must rely on correctly timing sells, the better your outcomes. A systematic, diversified strategy means you won’t have to say “if only I had sold at X”, because your plan never depended on that in the first place. Instead, you can say “I’m glad I held on” – a phrase that, for the diversified long-term investor, has proven true far more often than not.
DISCLOSURES: Quantor Capital, LLC. (“Quantor”) is a Registered Investment Adviser ("RIA") with the United States Securities and Exchange Commission (“SEC”). Registration does not imply a certain level of skill or training, and the content of this communication has not been approved or verified by the SEC or by any state securities authority. The information presented is being provided strictly as a courtesy and for informational purposes only. It is not intended as an offer or solicitation to buy or sell any product or security. Be sure to first consult with a qualified financial adviser and/or tax professional before implementing any strategy discussed here. Certain sections of this communication may have been written with the assistance of AI. All sources cited are believed to be reliable, but accuracy and completeness cannot be guaranteed.
Different types of investments involve varying degrees of risk, and there can be no assurance that any specific investment or strategy will be suitable or profitable for a client's portfolio. Past performance does not guarantee future investment success. All investment strategies have the potential for profit or loss. Changes in investment strategies, contributions or withdrawals, and economic conditions may materially alter the performance of your portfolio. There can be no assurances that a portfolio will match or outperform any particular benchmark. Asset allocation and diversification do not assure or guarantee better performance and cannot eliminate the risk of investment losses.