John Arnold thinks he's solved the stock market with 2 sectors — can his strategy actually work for Canadians saving in a TFSA or RRSP?

His solution? A stripped-down portfolio split between just two sectors: technology and energy. On paper, the results look compelling: the image in Arnold’s post illustrates how the strategy delivered double-digit returns in six of the past seven years.

More importantly, the results are strong relative to risk, with a Sharpe ratio 1.16 (2) — essentially a score of how much return you’re getting for the risk you take. Anything above 1 is generally considered strong.

But before you ditch your index funds, it’s worth asking a tougher question: Did Arnold really decode the market, or just describe what’s been working lately?

A simple bet on two powerful trends

Arnold’s strategy is a straightforward bet on two forces that have shaped the global economy: the explosive growth of Big Tech and the comeback of energy — driven by inflation, geopolitical tensions and supply disruptions.

It’s not hard to see why that combination has worked. Technology stocks have grown on the back of artificial intelligence (AI) and digital transformation. At the same time, oil and gas markets have been rattled by the war in Iran, pushing crude prices to US$104 (C$145) per barrel as of late March 2026. (3)

Put those two developments together, and you get a portfolio that holds its own whether markets are booming or inflation is running hot — something traditional portfolios can struggle to tolerate.

In fact, Arnold’s approach even held up during periods when the classic 60/40 stock-and-bond portfolio (4) struggled, even as rising interest rates hurt bond prices.

What this looks like for Canadian investors

For Canadians watching from the sidelines, Arnold’s two-sector approach feels familiar. The Toronto Stock Exchange (TSX) is already heavily weighted toward energy — the sector accounts for approximately 15.4% of the S&P/TSX Composite Index and delivered returns of over 16% in the 12 months leading up to December 2025 (5).

Canadian tech has had its own wild ride. In 2025, AI hype created what one analyst called the largest gap in 20 years between the TSX’s best and worst tech performers (6). Celestica Inc. stocks shot up 262% while other names lost ground — a sign of how uneven the sector can be.

The broader market had a strong year, too. The S&P/TSX Composite returned 31.7% in 2025 — its best performance since 2009 and the second among G7 markets (7). Energy led the way, followed by materials and financials.

Practically speaking, Canadian investors looking to build Arnold-style exposure can do so through registered accounts. The iShares S&P/TSX Capped Energy Index ETF (TSX: XEG) provides exposure to approximately 26 Canadian energy stocks, with an MER of 0.60% (8). For tech exposure, the iShares S&P/TSX Capped Information Technology ETF (TSX: XIT) tracks the Canadian tech sector. Both can be held inside a Tax-Free Savings Account (TFSA) or Registered Retirement Savings Plan (RRSP), meaning gains can grow tax-free or tax-deferred.

For Canadian investors whose primary means for retirement savings are their RRSP and TFSA (9) — the registered accounts most commonly used to build long-term wealth — the idea of piling into only two sectors raises some concerns. The 2026 RRSP contribution limit is $33,810 (or 18% of prior-year earned income, whichever is lower) (10). The 2026 TFSA annual limit is $7,000 (11). These limits are your hard-won contribution room. Concentrating that capital in only two sectors is a significant bet.

Reasons for investors to be cautious

Here’s an uncomfortable truth most of us may not want to hear: Strategies that look brilliant in the theory may often fall apart when put in practice over a period of time. But there are a few caution signs worth watching out for.

It’s highly concentrated. Two sectors is a bigger bet than robust diversification. If either tech or energy falls, your strategy also takes a hit. In the last full week of March 2026, the tech-heavy Nasdaq index was down 3.23% — its biggest weekly decline since April 2025 (12).

It’s backward-looking. The last seven years were favourable for both sectors. However, that doesn’t mean the next seven will be.

Fragile assumptions. If AI momentum stalls, tech stocks could also slide. If governments clamp down on energy profits, or if supply stabilizes, energy stocks could follow. Supply and price disruptions can reverse as quickly as they happen

The TSX concentration problem cuts both ways. Canadian investors face a specific risk: The TSX is already heavily concentrated in energy, materials and financials, altogether making up approximately two-thirds of the index (13). An investor who doubles down on energy alone may be reducing their diversification rather than building a different kind of portfolio.

What most Canadian investors should consider

The appeal of Arnold’s strategy is understandable: simplicity, clarity and a compelling track record. But as Shon Anderson, president and chief wealth strategist at Anderson Financial Strategies, explained to CNBC: “Each asset class performs differently in various economic and financial environments. When you have multiple asset classes, you should have more opportunities to have pieces of your portfolio make money in almost any environment (14).”

Most everyday Canadian investors — saving through TFSAs, RRSPs, or non-registered brokerage accounts — may not have the stomach for the swings that come with a two-sector portfolio.

There’s no magic formula for long-term investing. What works best is building a portfolio sturdy enough to weather whatever ups and downs the market can throw at it.

A properly diversified portfolio spreads your money across different assets, sectors and countries — which helps reduce risk, smooth returns and limit losses when markets fluctuate. But real diversification goes deeper than just owning different assets. It’s also about spreading different kinds of risk, including inflation, interest rates, economic growth and currency swings (15).

For most Canadians, that still means broad diversification — not a two-sector bet.

What Canadian investors can learn from John Arnold

Arnold’s portfolio is an interesting consideration, rather than a fail-safe template. Here are some practical takeaways for Canadian investors: