Curious about today's AI digest?ai-tldr.dev
Pomegra LogoPomegra

Daily Digest

BriefMarket · bullishMedium impact
Esc
Person reviewing stock charts on smartphone with laptop on table in background
Photo: The Motley Fool

Russell 2000 Rises 21% in 2026 as AI Mega-Caps Lag

Bernstein2 min read6 sources

Why is the Russell 2000 up in 2026?

The Russell 2000 (IWM) is up 21% year-to-date in 2026 — its best start since 1991 — as investors rotate from pricey AI mega-caps into small-cap stocks trading at roughly 16x earnings.

Key numbers

Russell 2000 YTD 2026+21%Best start to a year since 1991
S&P 500 YTD 2026+12.7%8+ percentage points behind Russell 2000
Russell 2000 Fwd P/E~16x5 points below S&P 500 at ~21x
IWM ETF Price$284+21% since Jan 1, 2026
Fed Funds Rate3.75%–4.00%+25 bps on Sept 16, first hike in 3 years
Russell 2000 H1 2026+22%Fastest first half since 1991

What happened

The Russell 2000 (IWM) is up 21% year-to-date in 2026 — its best start since 1991 — as investors rotate from pricey AI mega-caps into small-cap stocks trading at roughly 16x earnings. The small-cap index has outpaced the S&P 500, which is up about 12.7% over the same period, by more than 8 percentage points. The gap in valuations is driving the shift: the average stock in the S&P 500 costs about 21 times its expected profits, while smaller companies trade at closer to 16 times — a meaningful discount. Shares of some of the biggest AI names, such as Microsoft, are up just 2.4% for the year, trailing the small-cap index by nearly 19 points.

Why it matters

The Russell 2000's rally matters because it signals that the market's gains are spreading beyond the handful of giant technology companies that drove most of the S&P 500's returns in recent years. Smaller companies tend to be more tied to domestic economic growth, and their outperformance suggests the broader U.S. economy is on solid ground. However, the Federal Reserve raised interest rates on September 16, which could pressure small-cap companies — about 40% carry floating-rate debt, meaning their borrowing costs rise immediately when the Fed acts.

Who this affects

Marketbullish
Medium impact
Broader market gains spreading well beyond mega-cap AI names.
Companybullish
Medium impact
Small-cap companies attract fresh capital as valuations look cheaper.
Competitorsbearish
Low impact
Mega-cap AI stocks such as Microsoft lag the small-cap rally.
Industrymixed
Medium impact
Tech sector losing capital to cheaper small-cap alternatives.

Russell 2000 vs S&P 500, Nasdaq-100, Microsoft

Russell 2000IWM+21%+22%~16x
S&P 500SPY+12.7%+9.3%~21x
Nasdaq-100QQQ+17.7%——
MicrosoftMSFT+2.4%—~30x

As of 2026-09-21

How we got here

  1. Fed rate cuts ease borrowing costs, giving small-cap stocks a lift.

  2. ISM Manufacturing PMI hits 55.6, signaling broad industrial expansion [per 1].

  3. Russell 2000 posts best first half since 1991, up 22% through June 30.

  4. Fed hikes rates 25 bps to 3.75%–4.00%, first increase in three years.

  5. Russell 2000 up 21% YTD, outpacing the S&P 500 by more than 8 points.

What to watch

  • Q3 2026 earnings: will small-cap profit growth of 40%+ hold up?Q4 2026
  • October FOMC: another hike would raise costs for floating-rate small-cap borrowers.2026-10-28
  • 10-year Treasury yield near 5%; sustained move higher pressures small caps.Q4 2026

Educational content only. Not investment advice.

More briefsAll briefs →