What Is IJK? iShares S&P Mid-Cap 400 Growth ETF
Last updated July 2026
Short answer
IJK is iShares S&P Mid-Cap 400 Growth ETF, an ETF that tracks a US mid-cap growth index at a 0.17% expense ratio. IJK tracks a US mid-cap growth index. It charges 0.17%. The distribution yield is about 0.52%. It has traded since 2000, so its record spans more than one full cycle. Holdings are spread widely, with the ten largest coming to about 14% of assets.
IJK is issued by iShares and tracks a US mid-cap growth index. It charges a 0.17% expense ratio, holds approximately $11.3B in assets under management, yields about 0.52%, and launched in 2000.
What is IJK?
IJK is iShares S&P Mid-Cap 400 Growth ETF, an ETF that tracks a US mid-cap growth index at a 0.17% expense ratio. IJK tracks a US mid-cap growth index. It charges 0.17%. The distribution yield is about 0.52%. It has traded since 2000, so its record spans more than one full cycle. Holdings are spread widely, with the ten largest coming to about 14% of assets.
IJK is issued by iShares and tracks a US mid-cap growth index, so a single ticker gives you the whole portfolio of underlying holdings weighted by the index's methodology rather than by any active stock-picking.
What does IJK hold?
IJK is weighted toward its largest constituents. As of August 2026, the top holdings are:
| Rank | Ticker | Company | % of IJK | |
|---|---|---|---|---|
| 1 | TWLO | Twilio Inc Class A | 1.6% | |
| 2 | CRS | Carpenter Technology Corp | 1.6% | |
| 3 | CW | Curtiss-Wright Corp | 1.5% | |
| 4 | NVT | nVent Electric PLC | 1.4% | |
| 5 | ATI | ATI Inc | 1.4% | |
| 6 | FTI | TechnipFMC PLC | 1.4% | |
| 7 | STRL | Sterling Infrastructure Inc | 1.4% | |
| 8 | MTZ | MasTec Inc | 1.3% | |
| 9 | WWD | Woodward Inc | 1.3% | |
| 10 | MTSI | MACOM Technology Solutions Holdings Inc | 1.3% |
The remaining holdings make up the balance of the fund, with weights tapering off below the top names. Because the index reconstitutes on a rolling basis, the roster stays current without active management. Each ticker above links to its individual stock guide in Walnut.
How do I invest in IJK?
There are three common ways to get IJK exposure. Buy shares (or fractional shares) of IJK directly at any major broker that lists it. Hold it as a core position and layer more concentrated ideas on top. Or build it into a thematic portfolio in Walnut, so IJK sits alongside other holdings that express the same thesis, with target weights you can rebalance toward. IJK trades like a stock during market hours, so you buy it the same way you would any listed share.
New to buying funds? See how to buy an ETF, step by step.
Is IJK a good buy?
Whether IJK is a good buy depends less on any single call and more on your time horizon and what you already hold: it tracks a US mid-cap growth index, so the real question is whether you want that exposure in your mix and at what weight. We walk through valuation, concentration, and what would have to be true for it to outperform from here in is IJK a buy?
The bottom line on IJK
IJK gives you a US mid-cap growth index exposure in one ticker at a 0.17% expense ratio. Most investors use it as a core holding and layer more concentrated thematic portfolios on top.
More on IJK
Whether IJK is worth buying today depends more on your time horizon and what you already hold than on any single call. We walk through valuation, concentration, and what would have to be true for it to outperform from here in is IJK a buy?
IJK yields 0.52% as of August 2026, paid by passing through the dividends of its underlying holdings. For the payout schedule, history, and how the distributions are taxed, see IJK dividend: yield and schedule.
New to funds like IJK? Start with what an ETF is, then how to buy an ETF, or browse the full guide to ETF investing.
Wondering how IJK fits the portfolio you already own? Walnut is an AI investing app that connects your brokerage read-only and answers questions like that about your actual holdings: overlap, concentration, and how each position tracks the S&P 500. Compare the best AI portfolio analyzers or see the best AI investing apps in 2026.
Investing in IJK with AI
Connect the broker you already use and ask Walnut's AI how IJK fits what you actually hold: what it overlaps with, what it leaves you exposed to, and how it has tracked the S&P 500. Read-only by default, and you approve anything before it reaches your broker.
FAQ
What is IJK's ticker symbol?
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IJK, iShares S&P Mid-Cap 400 Growth ETF. Issued by iShares; tracks a US mid-cap growth index. Trades during US market hours, available at every major US brokerage.
What is IJK's expense ratio?
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0.17% as of August 2026.
What are IJK's top holdings?
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Top holdings as of August 2026: TWLO, CRS, CW, NVT, ATI and others. See the full holdings table above.
How can I invest in IJK through Walnut?
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Walnut isn't a broker. Connect a brokerage and Walnut sits on top to help you build and track thematic portfolios. IJK can be a constituent alongside individual stocks.
How do I compare IJK to similar ETFs?
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Put a few fields side by side: the expense ratio (fees compound over decades), the index or strategy it tracks, the top holdings and how much they overlap with what you already own, the dividend yield, and the AUM, liquidity, and bid-ask spread that affect trading costs. For index funds, tracking error (how closely it follows its index) and tax efficiency matter too. IJK's figures are above; the full method is in Walnut's guide on how to compare ETFs.
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Walnut is informational, not investment advice. Holdings weights and fund statistics on this page are approximations stamped to August 2026; verify current figures against iShares's fund page or your broker before investing.