Margins, Mid-Caps and Market Resilience

Originally Posted 10 September 2025 – Margins, Mid-Caps and Market Resilience

Key Takeaways

• In a 2025 market dominated by tariff and inflation concerns, mid-caps have preserved profit margins near 30-year medians, highlighting their operational adaptability.
• While AI headlines center on large-cap growth, mid-sized companies are leveraging it as a margin defense tool, offsetting wage and input cost pressures through faster tech integration.
• Despite their resilience and balanced growth potential, mid-caps remain underrepresented in most portfolios, offering advisors a compelling opportunity to enhance diversification and valuation efficiency.

In a recent LinkedIn newsletter, we highlighted how mid-caps have historically delivered a compelling mix of growth and resilience, the “sweet spot” between innovation and maturity. They’ve graduated from the start-up phase, proven profitability and often trade at more reasonable valuations than their large-cap peers, while still delivering stronger earnings growth than small caps.

In this follow-up, we want to take that conversation a step further. Beyond the long-term track record of mid-caps, today’s environment adds another reason for advisors to revisit the segment: their resilience in navigating policy shocks, cost pressures and market uncertainty.

Resilience under Tariff and Inflation Pressures

Much of the conversation around equity markets in 2025 has focused on tariffs and inflation. Headlines warn of margin erosion, yet mid-caps are holding up surprisingly well.

The S&P MidCap 400 Index currently shows a profit margin of about 6.7%, essentially unchanged from 2024 and comfortably above its 30-year median. This is a reminder of mid-caps’ ability to adapt. They may lack the scale of mega-caps, but they often run leaner, more flexible operations that can adjust pricing, shift supply chains and preserve profitability in difficult environments.

No Sign of Tariffs Eroding Mid-Cap Margins

Source: WisdomTree, S&P, FactSet, as of 8/15/25. You cannot invest directly in an index. Past performance is not indicative of future results.

AI beyond Growth: A Cost-Defense Tool

AI has become synonymous with large-cap technology growth stories. But its real potential may be in cost containment across traditional industries.

As WisdomTree Senior Economist Professor Jeremy Siegel has noted, productivity gains from AI are not confined to Silicon Valley. Mid-sized companies, with leaner structures and fewer legacy systems, can often integrate new technologies faster, helping offset wage pressures, tariffs and other input costs.

For advisors, this reframes AI as more than a growth catalyst. In the mid-cap space, it can also serve as a margin defense mechanism, a distinct advantage in today’s inflationary environment.

The Advisor Blind Spot

Despite this resilience, mid-caps remain underrepresented in many advisor portfolios. In consultations, we often find they make up less than 5% of total equity exposure, typically buried in broad blend sleeves.

This is usually unintentional, driven by the gravitational pull of large-cap benchmarks like the S&P 500. But under-weighting to mid-caps leaves portfolios overly concentrated at the top of the market and missing out on a segment that combines profitability, adaptability and more attractive valuations.

A Streamlined Approach to Mid-Cap Allocation

For advisors looking to restore balance, the path doesn’t need to be complicated:

• Carve out a sleeve for mid-caps rather than letting them get lost inside blend funds.
• Rebalance over-weights to largecaps to create more even exposure across the size spectrum.
• Consider valuation and style balance to ensure mid-caps play their full role between growth-heavy large caps and more volatile small caps.

For example, funds that emphasize shareholder yield and quality screens, like the WisdomTree U.S. Value Fund (WTV), offer one way to reintroduce mid-caps thoughtfully. But more important than any single vehicle is the principle of giving mid-caps deliberate space in a portfolio, rather than letting them remain an afterthought.

The Case for Mid-Caps in 2025

Mid-caps aren’t just a bridge between large and small. They are a distinct asset class with unique advantages. Their ability to maintain profitability under tariff and inflation pressures, coupled with the potential to harness AI as both a growth engine and a cost-defense tool, makes them well-suited for today’s market environment.

After years of being overlooked, mid-caps may be ready to re-enter the spotlight. For advisors seeking resilience, diversification and balance, this is a segment worth revisiting.

For those interested in more insights like this on asset allocation and practice management, make sure to register for the Modern Advisor Playbook LinkedIn Newsletter, authored by Ryan and rotating guest WisdomTree thought leaders.