Risk Perspectives in Small Cap Growth: When Underexposure Becomes a Risk

Underexposure to rapidly growing small-cap winners can become as damaging as downside risk because benchmark concentration magnifies position-sizing decisions.

• The Russell 2000 Growth Index’s 10 largest positions rose from 6.07% of the index in 2016 to 13.78% in 2026, while their average security weight increased from 0.61% to 1.38%; data are as of June 25, 2026.
• In 2025, the average small-cap growth manager underperformed the Russell 2000 Growth Index by 5.22%, partly because several leading performers initially appeared expensive before benefiting from AI exposure and accelerating revenue and earnings growth.
• Voya argues that excluding large benchmark constituents solely on valuation grounds can create significant opportunity cost, especially because small caps have historically delivered stronger earnings growth than large caps while trading at a substantial valuation discount.
• In its Bloom Energy case study, Voya identified improving fundamentals and the company’s role as a mission-critical power infrastructure partner for AI hyperscalers in mid-2025, then established a slightly overweight position after concluding that valuation was less stretched than its initial screen suggested.

Takeaway: Small-cap growth managers should assess both downside and upside risk and adjust position sizes dynamically as benchmark weights change, while recognizing that smaller companies remain more volatile and exposed to issuer-specific risks.