Prioritizing Concentrated Portfolios Over Momentum-Driven Index Investing

Brian Belsky, Lindsay Rosner, and Josh Zegen discuss how investment strategies are changing. They argue that the best results now come from ignoring market momentum and focusing on concentrated, earnings-based conviction. While major indices sit at record highs, the real opportunities are shifting away from a few popular stocks toward the other 493. For investors, holding hundreds of stocks is an outdated practice. Those who accept the discomfort of a concentrated portfolio and wait for earnings-driven growth will likely outperform others over the next decade. This analysis is for capital managers who want to understand why the most popular investment paths are currently the most crowded and least profitable.

The Hidden Cost of Sophisticated Diversification

Institutional investors have long believed that more is better, favoring large portfolios with extensive coverage. Belsky disagrees, calling this a mistake. He points out that many professionals own 350 stocks, which he considers excessive. By comparing concentrated portfolios to these bloated institutional models, he finds that 50 stocks is the ideal number for high-performance management.

To go from 300 stocks down somewhere in the vicinity south of 100 stocks is the absolute foundational structure of modern management.

-- Tom Keene

This approach is not just about picking winners; it is about avoiding mediocrity. Holding 300 stocks is essentially a bet on the index. By narrowing your focus, you gain the tracking error needed to beat the market. This requires a deeper understanding of your holdings, turning the investor from a passive participant into an active owner.

Why the Obvious Fix Makes Things Worse

In real estate, Josh Zegen explains how systemic issues like zoning and limited housing supply create immediate problems. The obvious solution for empty office buildings is to convert them, but Zegen notes this only works when the system provides the right incentives, such as the 467m tax abatement in New York.

The risk is that developers who rely on obvious demand without understanding the regulatory and tax landscape often end up with stranded assets. The advantage goes to those who treat conversions as engineering problems, using pre-sales and deposit structures to fund the deal before construction starts. This is the difference between an amateur and a professional: the latter builds a financial structure to handle risk before the physical work begins.

The 18-Month Payoff Nobody Wants to Wait For

Belsky’s view on the shift from a momentum-driven market to an earnings-driven one presents a challenge for many. Momentum markets are fast and feel productive, while earnings-driven markets are slower, more volatile, and offer lower annual returns.

We don't like to time the market it's very difficult to time the market that's why we remain invested but we would put our extra powder to work if and when we see that pull back.

-- Brian Belsky

The temptation is to chase the quick rewards of momentum. However, Belsky notes that the typical pullback for an earnings-driven market has not arrived yet. The advantage belongs to those with the patience to wait for that correction rather than forcing capital into the market today. This requires the discipline to stay invested while others panic, a trait few professionals possess.

How the System Routes Around Your Solution

The conversation also covers tax harvesting, a strategy often sold to wealthy investors as a way to improve returns. Belsky is blunt, suggesting that for many, this is less about strategy and more about generating fees.

The first order recurrence function of this is real simple you sell you sell the first loss I feel great you sell the second loss you get out you literally lead the seventh the eighth and ninth the tenth loss and the 14th isn't working is it.

-- Tom Keene

The danger is that by focusing on immediate tax benefits, investors lose sight of long-term compounding. The system creates products that look like optimization but distract from the goal of making money through high-quality earnings growth.

Key Action Items

• Audit your portfolio concentration: Move away from the 300-stock institutional model. Evaluate whether your holdings are high-conviction or just index-mimicry.
• Shift to an earnings-first framework: Stop optimizing for momentum. Over the next 12 to 18 months, prioritize companies rewarded for fundamental earnings growth rather than hype.
• Prepare for the earnings-driven pullback: Do not try to time the market, but keep extra cash ready. When a correction occurs, use it to deploy capital into the 493 stocks currently being ignored.
• Distinguish speculation from investment: Keep speculative capital in a separate account from the investments you want to own long-term.
• Evaluate real estate through incentives, not just demand: Focus on projects with structural tax or zoning advantages. The advantage lies in the engineering of the deal, not just the property.
• Question the tax-efficient fee structure: Before using tax harvesting strategies, calculate the net gain after fees. If the strategy primarily generates 75 to 125 basis points for the advisor, it is likely not serving your long-term wealth.