Why I'm Long Small Caps — Picking IJR Over IWM
Why I'm Long Small Caps — Picking IJR Over IWM
Why Small Caps Now
Small caps have been completely overshadowed by big tech for years. Yet here I am, holding a long position in IJR.
The chart seems to give an obvious answer. Stretch out the IWM/SPY ratio and the trade has been almost one-way: long large caps, short small caps. People asking "why bother with the small ones" makes sense. But if markets were that simple, we'd all be rich.
Here's my thesis: the real beneficiary of AI capex isn't the megacap pouring billions into data centers — it's the small companies renting that infrastructure for nearly nothing.
The Big Spend, the Small Win
I feel this in my own business. We're a small software company. We haven't put a dollar into data centers. Yet with AI tools, we ship in weeks what used to take six months. Headcount basically the same, output multiplied.
That sounds like one company's story, but tens of thousands of US small caps are seeing the same lift. In my view, the layer extracting margin from AI infrastructure is going to be small caps, not the hyperscalers laying it down.
This isn't a "big tech is finished" call. The hyperscalers will keep doing fine as infrastructure providers. The point is that price already reflects that, while small caps haven't priced this spillover at all.
Why IJR, Not IWM
Within small caps, IWM (Russell 2000) and IJR (S&P SmallCap 600) are constructed differently.
| ETF | Index | Inclusion rule |
|---|---|---|
| IWM | Russell 2000 | Pure market cap — many money-losing names |
| IJR | S&P SmallCap 600 | Profitability requirement — quality filter |
IWM has too many zombies. I want to bet on living businesses that can squeeze efficiency out of AI — not on marginal companies that can't survive a higher interest rate. That's why IJR. It's a mix of quality and growth, with profitability as the floor.
I'm Not Chasing the Short-Term Trade
The long-term position is already on. But for a short-term active trade, the chart has run too far. On the Russell 2000 I want a 38.2% retracement plus a retest of the prior consolidation high before I add. If it doesn't get there, I don't add. That's the whole rule.
The key is separating investing (IJR long-term) from trading (Russell short-term). Same asset class, different time horizon, different entry criteria.
The Risks Are Real
- If rates back up, small caps get hit first — they carry more debt as a percentage of market cap.
- The "AI efficiency → margin expansion" thesis takes time to actually show up in earnings.
- If recession signals fire, the small caps that were strongest going in tend to crack first.
Knowing all this, I'm still in because over a multi-year window the relative valuation gap between mega-caps and small caps has stretched too far. Even partial mean reversion is enough alpha.
This isn't financial advice. It's my hypothesis, and trading is risky.
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