Owning the S&P 500 Is Not the Same as Having a Portfolio

Aug 28

10 min read

What Trinidad and Tobago investors should understand about concentration, drawdowns, and building beyond U.S. large-cap equities.

503 index holdings

37.3% information technology

37.3% ten largest holdings

S&P 500 index data as at 20 August 2026. Weights change with market prices.

In the first article in this series, I argued that Trinidad and Tobago investors should not begin with a simple choice between the S&P 500 and the TTSE. The better starting point is the investment universe each investor can actually access, the currencies in which future goals will be funded, and the role each market can reasonably play.

Once that question is answered, another one usually follows. If I can access U.S. dollars and invest internationally, why not simply put everything into the S&P 500?

It is a fair question. The S&P 500 has been one of the most effective long-term wealth-building vehicles available to ordinary investors. It provides liquid, low-cost access to many of the world's most successful companies. It has also rewarded investors who remained patient through wars, recessions, financial crises, and sharp market declines.

I consider the S&P 500 a good investment. The harder question is whether one excellent investment can perform every job required of a portfolio. I believe it cannot.

The S&P 500 solves one problem exceptionally well

The S&P 500 is designed to represent the U.S. large-cap equity market. It includes 500 leading companies, represented by 503 holdings because some companies have more than one listed share class, and covers approximately 80% of available U.S. equity market capitalization.

Its construction is more selective than many investors realize. S&P Dow Jones Indices considers market size, liquidity, public float, and financial viability, among other criteria. The constituents are weighted by float-adjusted market capitalization, so the companies with the greatest value available to public investors receive the largest weights.

That structure gives investors broad exposure to established U.S. businesses in a single transaction. It also allows the index to evolve. Companies that decline in relevance can eventually leave, while businesses that grow large enough and meet the eligibility requirements may enter.

For long-term growth capital, that is a powerful proposition. It still describes only one part of the investment world: large companies listed in the United States.

Five hundred companies do not mean five hundred equal bets

The number of holdings creates an impression of even diversification. The actual risk allocation is much less even because market-capitalization weighting gives the largest companies far more influence than the smallest.

At 20 August 2026, information technology represented 37.32% of the S&P 500. The ten largest holdings represented approximately 37.34%. NVIDIA, Apple and Microsoft alone accounted for just over 20% of the index. A Trinidad investor buying an S&P 500 fund was therefore placing a meaningful part of the portfolio behind a relatively small group of mega-cap companies and the continued strength of the technology-led investment cycle.

This concentration is not inherently a flaw. Market-cap weighting allows successful companies to become larger positions, keeps turnover relatively low, and has contributed to strong returns when the biggest companies have continued to compound earnings. It does, however, mean that the index can be more exposed to one style of market leadership than the company count suggests.

The concentration also changes over time. Today's S&P 500 is not the same portfolio that an investor bought twenty years ago. Sector weights, valuations, and dominant companies evolve with market prices and corporate fortunes. Historical returns belong to the index through all of those earlier configurations. A new investor receives today's composition at today's price.

The TTSE and the S&P 500 concentrate risk in different places

Blog one showed why the TTSE Composite and the S&P 500 should not be treated as interchangeable versions of the same investment. The latest market data makes the contrast especially clear.

For the week ended 20 August 2026, the TTSE reported Composite market capitalization of approximately TT$99.6 billion. Banking represented about 56.8% of that capitalization, while non-banking finance represented another 10.7%. Conglomerates accounted for approximately 19.0%. Taken together, those three classifications represented roughly 86% of reported Composite capitalization.

The S&P 500, by comparison, was led by technology, followed by financials, communication services, health care, consumer discretionary and industrials. It had broader sector representation, but it was still concentrated in its largest companies and in technology-related earnings.

The two indices carry different economic bets. Combining them can broaden a portfolio, but only if the position sizes reflect the risks already present in the investor's employment, business interests, property, pension assets and other holdings.

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Global businesses are not the same as a global portfolio

A common defence of an S&P 500-only strategy is that its companies earn revenue around the world. There is truth in that argument. S&P Dow Jones Indices reported that companies in seven of the eleven S&P 500 sectors earned more than 25% of their revenue outside the United States, while the information technology sector earned more than half of its revenue internationally.

That global revenue makes the index more internationally connected than the phrase 'U.S. equities' suggests; it does not make the portfolio geographically complete.

A U.S. company selling products in Europe or Asia remains a U.S.-listed company, valued by the U.S. market and influenced by U.S. financial conditions, index flows and investor sentiment. Direct ownership of companies listed in Europe, Japan, Canada and emerging markets introduces different sector mixes, valuation starting points, currencies and economic cycles.

As at March 2026, the United States represented approximately 61% of the S&P Global BMI. That is an enormous share of global equity value, but it also means roughly 39% sat outside the United States. An investor may reasonably choose to overweight the U.S. because of its market depth and corporate strength. That should be a deliberate allocation decision, not an accidental result of treating the S&P 500 as the entire global market. Even the S&P 500 excludes the mid-cap and small-cap space.

The long-term return came with difficult journeys

Long-term S&P 500 return statistics are compelling. State Street reports that the S&P 500 Total Return Index produced an annualized return of roughly 11% from January 1988 through June 2026. Those results include reinvested distributions and many periods in which holding the index felt anything but comfortable.

S&P Dow Jones Indices data covering the period from the end of 2002 through June 2024 recorded a 55.25% drawdown during the global financial crisis, a 33.79% drawdown during the COVID-19 shock and a 24.49% drawdown during 2022. The decline during the financial crisis took years to recover. The COVID-19 recovery was much faster. An investor could not know the recovery path in advance.

Risk tolerance is often discussed as a score on a questionnaire. In practice, it is tested when a portfolio worth US$1 million falls toward US$700,000, or lower, while the news is deteriorating and the investor's business or employment income may also be under pressure.

Investors who sell during those periods do not receive the long-term return shown in the historical chart. They receive the return created by their actual purchases and sales. A portfolio strategy must therefore be built around the loss an investor can survive financially and tolerate behaviourally.

Sequence risk changes the answer as withdrawals approach

For an investor who is still accumulating and contributing regularly, a market decline can be painful but useful. New contributions buy more shares at lower prices, and the investor has time to wait for a recovery.

The same decline can be far more damaging for someone who has started taking withdrawals. If an investor must sell shares after a large fall to fund retirement, a property purchase, education costs or a business commitment, fewer shares remain to participate in the eventual recovery. This is sequence-of-returns risk.

Two portfolios can earn the same average return over a period and still produce very different outcomes when one investor is withdrawing along the way. The order of the returns matters because spending continues while the portfolio value is depressed.

This is why the right allocation cannot be determined by age alone. A business owner expecting a major capital call may need greater liquidity even with a long retirement horizon. A retiree with substantial pension income and modest portfolio withdrawals may be able to hold more equities than another retiree of the same age. The cash-flow plan determines how much market risk the portfolio can carry.

Starting valuation still matters

An outstanding business can become a poor investment if the purchase price assumes too much future success. The same principle applies to an index.

At 20 August 2026, State Street reported a trailing price-to-earnings ratio of 25.28 for the S&P 500 and a one-year forward ratio of 21.24. These figures do not predict an imminent decline. Valuation is a weak timing tool, and strong earnings growth can justify a higher multiple for extended periods.

A higher starting valuation does, however, raise the amount of future growth already reflected in the price. Returns can disappoint even when profits continue to rise if investors become less willing to pay the same multiple for those profits.

Reversion toward more normal valuation does not require a dramatic crash. It can happen through a price decline, through earnings catching up while prices move sideways, or through several years of returns below the recent experience. Investors should not automatically convert the index's historical annualized return into a personal planning assumption for the next decade.

What is still missing from an S&P 500-only portfolio?

The S&P 500 can serve as a core growth engine. A complete portfolio may still need other components, each with a specific job.

Portfolio need	What the S&P 500 provides	What may still be required
Long-term growth	Broad exposure to U.S. large-cap companies	International equities and U.S. small- and mid-cap exposure where appropriate
Capital preservation	No contractual protection from equity-market losses	High-quality fixed income matched to the investor's horizon and currency needs
Near-term liquidity	Shares can be sold quickly, but the price may be depressed when cash is needed	Cash and short-duration reserves for known commitments
Inflation and regime diversification	Some businesses can pass through inflation, but results vary by sector and valuation	Selective real assets, inflation-linked securities, gold or other diversifiers where suitable
Local and regional goals	Limited direct connection to TT-dollar liabilities and Caribbean opportunities	Purposeful TT-dollar and Caribbean exposure, sized for liquidity and concentration
Specialist opportunities	A rules-based large-cap core	Individual stocks, bonds, active funds, structured solutions or private markets when scale, access and due diligence justify them

The appropriate combination depends on the investor's goals, currencies, risk capacity, time horizon and existing balance-sheet exposures.

Build the portfolio by function, not by popularity

A useful way to move beyond the one-index debate is to assign every holding a job.

• Liquidity reserve. Capital for known short-term spending, business needs, or emergencies should not depend on selling equities after a decline.

• Defensive assets. High-quality bonds can provide income, contractual cash flows and a source of funds for rebalancing, although their maturity and interest-rate exposure must be chosen carefully.

• Global growth engine. The S&P 500 may be a major part of this allocation. International developed markets, emerging markets, and smaller companies can broaden the opportunity set.

• Local and regional allocation. TTSE and Caribbean securities can provide useful income and region-specific opportunities, but the allocation should reflect liquidity, governance, valuation, and the investor's existing exposure to the domestic economy.

• Diversifiers. Gold, real assets, alternative strategies and private markets may improve portfolio resilience in some cases. They also introduce their own costs, liquidity restrictions and manager-selection risks.

• Selective active positions. Larger portfolios may have room for carefully researched stocks, individual bonds, active funds or structured solutions. These positions should complement the core rather than turn the portfolio into a collection of unrelated ideas.

There is no universal percentage for each component. The important discipline is to identify why the holding exists, what risk it is expected to reduce or reward, and the conditions under which it would be rebalanced or removed.

The answer changes with the investor

The long-term accumulator

An investor with stable income, a long horizon, and no expected withdrawals can usually carry more equity risk. The S&P 500 may reasonably be a large part of the growth allocation. Even here, geographic diversification and exposure beyond the largest U.S. companies deserve consideration.

The business owner

A Trinidad business owner may already have substantial exposure to the local economy, local property, local banks, and a single operating company. International equities can help diversify that balance sheet. The first requirement, however, may be a separate liquidity reserve so that business needs do not force the sale of long-term investments at the wrong time.

The investor approaching retirement

As portfolio withdrawals approach, the order of returns becomes more important. Fixed income, cash reserves and a withdrawal plan can reduce the need to sell equities after a major decline. The S&P 500 can remain an important growth allocation without being responsible for next year's spending.

The high-net-worth family with several accounts

For many established investors, the problem is not a lack of investments. It is that local shares, U.S. ETFs, bonds, cash, pensions, property and private businesses were accumulated at different times without one structure tying them together. The solution begins with a consolidated view of sector, geography, currency, liquidity, and goal exposure across the full family balance sheet.

A portfolio should be designed for the period when the story changes

Recent performance often makes risk feel smaller than it is. When an index has compounded strongly, investors naturally become more confident that patience will be rewarded. History supports long-term patience, but it also shows that the path can include declines of 25%, 35% or more than 50%.

The practical test is whether an investor could keep the position through a severe decline while still meeting family, retirement, and business obligations. If the answer depends on everything going smoothly at the same time, the portfolio is carrying more risk than the account statement reveals.

Diversification cannot remove loss. It can reduce the dependence of the plan on one market, one sector, one currency, or one sequence of returns. That is the real purpose of building beyond a single index.

Five questions before making the S&P 500 your core

• How much exposure do I already have to the United States through other funds, pensions and individual shares?

• Could I remain invested if the position fell by one-third, and what would happen to my financial plan if it did?

• Will I need withdrawals from this portfolio within the next five years?

• Which important risks in my life are not addressed by U.S. large-cap equities?

• What role will international equities, fixed income, TT-dollar assets, liquidity reserves and alternatives play alongside it?

The S&P 500 can be the core without becoming the whole

I remain comfortable with the S&P 500 as a long-term portfolio building block. Its companies, liquidity, transparency, and ability to evolve make it difficult to dismiss. For many investors, it deserves an important place in the portfolio. That is, with a clearly defined role. It should not be asked to provide short-term liquidity, protect capital during every decline, diversify every geography, match TT-dollar obligations, and fund every future goal by itself.

The strongest portfolio is rarely the one with the most fashionable investment. It is the one in which growth assets, defensive assets, liquidity and diversifiers work together around the investor's actual life.

If you currently hold local shares, S&P 500 funds, fixed income and cash across several accounts but are unsure how the pieces fit together, a portfolio consultation can help. I can map the exposures, identify concentrations, assess liquidity and downside risk, and build a structure for future contributions and withdrawals.

As always, no pressure, just perspective.

- Daniel Tittil, CFA, CAIA, MSc.

Lead Advisor, WealthwithDaniel.com

Portfolio & Wealth Manager, Director, Admiral Capital Chief Investment Officer, Legacy Wealth Management (Cayman) Ltd.