When you pause and reflect, it’s actually quite extraordinary to have lived through the last few decades in the financial markets. Because thanks to relentless innovation and technology, everything feels new—almost like we're only at the start of a new era in finance.
This sense of novelty extends even to our own core investment philosophy: momentum investing.
A Quick Refresher: What Is Momentum Investing?
Momentum investing is a remarkably logical idea: stocks that have outperformed their peers (the “winners”) tend to keep outperforming. It’s the simple tendency for assets in motion to stay in motion—until they don’t.
Despite the momentum effect being present for over a century, it wasn’t until a landmark academic paper in 1993* that the concept received proper recognition. That paper opened the floodgates: over the ensuing decades, a vast body of academic research has confirmed the superiority of momentum over many other investment styles.
Naturally, as night follows day, some academics pushed back against the outperformance of momentum investing—on the grounds of transaction costs.
The Academic Debate: Does Momentum Fall Apart Under Trading Costs?
Critics argue that high turnover makes momentum investing fragile. Because momentum managers frequently refresh their portfolios—selling stale trades and rotating into newly strong names—they rack up trading costs. These costs, the argument goes, can erode or even eliminate any edge momentum has over simply investing in the index.*
But here’s the beauty of peer-reviewed research: every paper has a counter-paper.
Another growing camp of academics insists this fear is outdated. Yes, in the “good old days” when a round trip cost 1.7–2%, momentum's advantage might have been wiped out. But today? Institutional trading fees are often as low as 0.1–0.2%. And thanks to smart execution techniques and vastly improved liquidity, those costs are far less destructive.*
Here's the Real Question
Rather than asking whether momentum as a concept is vulnerable to trading costs, the real question should be:
How vulnerable is the implementation of a specific momentum strategy to transaction costs?
And to be perfectly honest, that's the whole point of this blog post—to demonstrate how utterly pointless the theoretical debate over transaction costs can be when viewed in the context of an actual, real-world strategy.
Let’s Look at the Alpha-Elite Momentum Strategy
Graph 1: Our Momentum Strategy — Clean and Simple
Take a look at Graph 1. This represents the performance of the Alpha-Elite U.S. strategy, which draws from a universe of Nasdaq-100 and S&P 100 stocks. Our system selects just five stocks per month.
Graph 1
The results are based on the closing prices on the last day of each month—an idealized reference point, yes, but a necessary one. And while you might argue that such precision is unrealistic in practice, it's more relevant than you might think: most trading volume—and thus liquidity—occurs near the close.
But even if you disagree, stay with me. Because this is where it gets interesting.
Graph 2: What Happens When We Include Transaction Costs?
In Graph 2, we apply a blanket 20 basis point round-trip trading cost to our strategy. Unsurprisingly, the performance drops by about 2.4% per year. That's the most obvious and dumb analysis one can possibly do.
But here’s the thing: this is not how trading works in real life.
Graph 2
Real World vs. Theory: The Monster Beverage Example
Let’s say we’re buying Monster Beverage Corp [MNST] at the end of June 2025.
The closing price was $62.64
Add a 0.1% fee → effective price: $62.70
But what if the stock had been bought just 15 minutes earlier? Then the price might have been $62.58 → effective price including fees: $62.64
Or maybe it was bought at the high of that bar: $62.67 → effective with fees: $62.73
MNST 15-minute chart
The point? Execution timing matters more than the 0.1% fee. In many cases, the fee becomes noise.
How Robust Is Our Strategy to Timing?
Graph 3: Sensitivity Analysis
To test the robustness of our monthly portfolio rebalancing strategy, we simulated different entry and exit scenarios.
In the first test, we assumed each stock was bought at the closing price on the last day of the month and sold at the closing price on the last day of the following month.
We then ran additional simulations using the closing prices from the second-last and third-last trading days of each month. For each of these scenarios, we also tested using the mid-range price, calculated as the average of the day’s high and low prices.
Graph 3
The result? All equity curves looked nearly identical. That tells us something powerful: our strategy is not sensitive to small timing or cost variations. It’s robust. It holds up.
We Go Further to Reduce Friction
Our design decisions intentionally reduce cost exposure:
We trade only large- and mega-cap equities in the U.S. and Europe. Mid-cap and small-cap stocks have higher trading costs
We avoid short selling, which adds cost and complexity
We don’t fully change our stocks every month—stocks can and often do persist in the portfolio across multiple periods
Why Do People Still Obsess Over Fees?
If transaction costs aren’t such a big deal, why do people still focus so much on them?
1. Retail Psychology and Marketing
"Zero-commission" trading is easy to market. Platforms like Robinhood have gamified trading and advertised "free" investing. For individual investors, brokerage fees are tangible and visible, while price slippage is less obvious. Sometimes, it's just legacy thinking — people still talk about fees because it used to matter more when commissions were 1–2% per trade (before the 2000s).
2. High-Frequency Traders
For market makers and HFTs making millions of trades, tiny costs matter. They have to optimize every basis point to survive. They obsess over microscopic costs because it directly affects their statistical edge.
3. Mutual Funds and Large ETFs
Large mega-funds running momentum strategies often scrape out a small edge over the benchmark. For them, even small costs can matter because their relative advantage is small to begin with.
Final Thoughts: Don’t Worry About the 0.1%
Yes, it’s prudent for any portfolio manager to negotiate the lowest trading fees possible. But here’s what matters more:
Can the strategy withstand variations in execution, price and cost? Or does it fall apart if a trade is delayed or the fee is slightly higher?
If the answer is the latter, the strategy is fragile—and that’s a much bigger concern than 0.1%.
We’ve tested and retested our approach, and the conclusion is clear: our strategy remains strong regardless of small changes in cost or timing.
* References
Hoffstein, C., 2018. Two centuries of momentum. Newfound Research.
Hurst, B., Ooi, Y.H. and Pedersen, L.H., 2017. A century of evidence on trend-following investing. The Journal of Portfolio Management, 44(1), pp. 15-29.
Dennehy, B., 2021. The history of momentum investing – Two centuries of pedigree.
Geczy, C.C. and Samonov, M., 2016. Two centuries of price-return momentum. Financial Analysts Journal, 72(5), pp. 32-56.
Jegadeesh, N. and Titman, S., 1993. Returns to buying winners and selling losers: Implications for stock market efficiency. The Journal of Finance, 48(1), pp. 65-91.
Korajczyk, R.A. and Sadka, R., 2004. Are momentum profits robust to trading costs? The Journal of Finance, 59(3), pp. 1039-1082.
Lesmond, D.A., Schill, M.J. and Zhou, C., 2004. The illusory nature of momentum profits. Journal of Financial Economics, 71(2), pp. 349-380.
Agyei-Ampomah, S., 2006. The post-cost profitability of momentum trading strategies: Evidence from the UK. Journal of Business Finance & Accounting, 34(1-2), pp. 141-167.
Asness, C.S., Frazzini, A., Israel, R. and Moskowitz, T.J., 2014. Fact, fiction, and momentum investing. The Journal of Portfolio Management, 40(5), pp. 75-92.
Frazzini, A., Israel, R. and Moskowitz, T'Connor, J., 2015. Implementing momentum: What have we learned? AQR Capital Management.
SGH/EAM Investors, 2015. Momentum and trading costs.
Israel, R., Moskowitz, T.J., Ross, S.A. and Serban, L., 2017. The costs of implementing momentum strategies. Alpha Architect.
Korajczyk, R.A. and Sadka, R., 2004. Are momentum profits robust to trading costs? The Journal of Finance, 59(3), pp. 1039-1082.