Leveraging Q3 Earnings for Strategic Entry into Undervalued Growth Stocks: A Momentum Investing Perspective

The third quarter of 2025 has delivered a striking dichotomy in U.S. equity markets: while AI-driven growth stocks like NVIDIA and Microsoft have shattered records, the broader market has begun recalibrating toward undervalued segments. This shift presents a unique opportunity for momentum investors to leverage earnings surprises and valuation discrepancies to identify high-conviction entry points in overlooked growth equities.

The Overvaluation Premium and Its Implications

As of June 30, 2025, growth stocks traded at an 18% premium to fair value, a historically rare overvaluation that often precedes market correctionsQ3 2025 Stock Market Outlook: After the Rally, What’s Still Undervalued^[1]. This premium is concentrated in mega-cap technology leaders, whose AI-driven earnings growth—exemplified by NVIDIA's $35.1 billion Q3 revenue surge (up 94% year-over-year)—has fueled speculative optimismNVIDIA's AI Ascendancy: A Record-Breaking Q3 FY2025 Fuels Global Tech Shift^[2]. However, this concentration risks creating fragility, particularly as geopolitical tensions and tariff pressures weigh on sectors like industrials and consumer discretionaryThe Big Picture - Stock Market Outlook Q3 2025: Volatility, Valuations, and Smart Investment Strategies^[3].

Conversely, small-cap and value stocks have emerged as compelling alternatives. Morningstar data reveals that U.S. value stocks trade at a 12% discount to fair value, while small-cap stocks are undervalued by 15–25% as of August 2025Undervalued Darlings: Small-Cap and Value Stocks Outperform in Q3 2025^[4]. This divergence reflects a broader market rotation driven by expectations of Federal Reserve rate cuts and improved access to cheaper credit for smaller firms. For momentum investors, the key lies in identifying undervalued growth stocks that have recently outperformed expectations, signaling potential for continued appreciation.

Earnings Surprises as Momentum Catalysts

Q3 earnings reports have underscored the importance of earnings surprises in driving momentum. Tesla's Q3 results, for instance, saw revenue exceed $29 billion, with its energy segment contributing nearly 20% of total sales—a 7% post-earnings stock price jumpTesla Q3 2025 Financial Report: What It Means for Investors and Owners^[5]. Similarly, Advanced Micro Devices (AMD) has emerged as a high-conviction AI play, with estimated 2025 EPS growth of 293.4% and a fair value upside of 52.3%10 Value Plays Quietly Positioning for Up to 50% Upside in 2025^[6]. These surprises validate momentum strategies that prioritize recent performance while accounting for forward-looking fundamentals.

Merck (MRK) and Alphabet (GOOGL) further illustrate this dynamic. Merck, despite a -21.7% year-to-date decline, trades at a forward P/E of 8.5x and offers a 45.5% estimated upside. Alphabet, categorized as a defensive tech stock, has a forward P/E of 17.4x and a 11.6% fair value upside, despite a -11.9% YTD decline. Both stocks represent opportunities where earnings resilience and sector rotation could catalyze momentum.

Historical backtesting of earnings beats by AMD, Merck, and Tesla from 2022 to 2025 reveals a compelling pattern: post-event excess returns averaged 4.9% over 30 days, with win rates exceeding 80% during the first 16 days after the eventUndervalued Darlings: Small-Cap and Value Stocks Outperform in Q3 2025^[8]. The strongest performance occurred between day 5 and day 16, with significance peaking at ~89% win rate. However, the effect faded after day 17, suggesting a time-sensitive window for capturing momentum.

Strategic Entry Points and Risk Mitigation

For investors, the challenge lies in balancing momentum with valuation discipline. Small-cap and value stocks, while undervalued, carry higher volatility due to their sensitivity to interest rates and economic cycles. However, the anticipated Fed rate cut in September 2025—projected to reduce borrowing costs for small-cap firms—could amplify their earnings growth potentialUndervalued Darlings: Small-Cap and Value Stocks Outperform in Q3 2025^[8]. Regional banks and industrial manufacturers, in particular, have shown strong fundamentals amid improving GDP trends.

That said, risks persist. The Magnificent 7's dominance in the S&P 500 means that any earnings shortfall or valuation correction in these names could ripple across the marketU.S. Stock Market Smashes Records in Q3 2025, Fueled by AI and Anticipated Fed Cuts^[10]. Additionally, geopolitical tensions, such as the Israel-Iran conflict, remain wild cards that could disrupt momentum-driven strategiesThe Big Picture - Stock Market Outlook Q3 2025: Volatility, Valuations, and Smart Investment Strategies^[11]. Diversification across sectors and geographies remains critical.

Conclusion: A Balanced Approach to Momentum Investing

Q3 2025 earnings have illuminated a market at an inflection point. While growth stocks remain central to AI-driven narratives, their overvaluation necessitates a strategic pivot toward undervalued segments. By focusing on earnings surprises—such as those seen in AMD, Merck, and Tesla—investors can harness momentum while mitigating downside risk. As the Fed's policy trajectory and macroeconomic data evolve, the interplay between valuation discounts and earnings momentum will likely define the next phase of market leadership.