IJJ vs MDY: Holdings Overlap
IJJiShares S&P Mid-Cap 400 Value ETF
iShares · 301 holdings · $9.0B · as of 2026-03-31
MDYState Street® SPDR® S&P MIDCAP 400® ETF Trust
State Street (SPDR) · 399 holdings · $27.1B · as of 2026-08-06
Holdings snapshots are 128 days apart (IJJ: 2026-03-31, MDY: 2026-08-06). Weights and index membership change between snapshots, so the true current overlap is typically higher than shown. For funds tracking the same index, the gap can be 5–15 points.
How similar are IJJ and MDY?
iShares S&P Mid-Cap 400 Value ETF (IJJ, by iShares) holds 301 positions; State Street® SPDR® S&P MIDCAP 400® ETF Trust (MDY, by State Street (SPDR)) holds 399. They have 290 holdings in common, and by portfolio weight the two funds are 62.0% identical. In practical terms the pair is heavily overlapping, with largely the same stocks driving both funds.
- Overlap by Weight
- 62.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 290IJJ holds 301 · MDY holds 399
- Weight in Shared Holdings
- IJJ 97%·MDY 68%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in IJJ
11 of 301 positions (1.8% of the fund) are not held by MDY.
Sector Breakdown
| Sector | IJJ | MDY |
|---|---|---|
| Industrials | 19.0% | 25.9% |
| Financials | 22.4% | 16.0% |
| Information Technology | 7.0% | 15.6% |
| Consumer Discretionary | 12.4% | 11.6% |
| Health Care | 3.2% | 10.3% |
| Other Sectors | 35.1% | 25.7% |
Share of each fund's portfolio weight by GICS-style sector, compiled from issuer fund data and our own classification of the holdings, not the issuers' published sector charts.
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IJJ | +3.0% | +15.1% | +23.8% | +12.8% | +9.2% | +10.5% | 1.56% |
| MDY | +3.1% | +18.1% | +25.6% | +14.2% | +8.8% | +10.9% | 0.99% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in IJJ vs MDY →
Shared Holdings(290)
The top 10 shared positions account for 10% of the overlap, led by AA, BJ and FHN.
 AAAlcoa Corporation | 1.09% | 0.68% | 0.68% |
|---|---|---|---|
 BJBJ's Wholesale Club Holdings, Inc. | 0.82% | 0.67% | 0.67% |
 FHNFirst Horizon Corporation | 0.70% | 0.67% | 0.67% |
 USFDUS Foods Holding Corp. | 1.30% | 0.64% | 0.64% |
 WSOWatsco, Inc. | 0.81% | 0.63% | 0.63% |
 KNXKnight-Swift Transportation Holdings Inc. Class A | 0.59% | 0.62% | 0.59% |
 ENTGEntegris, Inc. | 0.68% | 0.59% | 0.59% |
 RSReliance, Inc. | 1.01% | 0.58% | 0.58% |
 OCOwens Corning | 0.57% | 0.65% | 0.57% |
 ILMNIllumina, Inc. | 0.55% | 0.80% | 0.55% |
 SNXTD SYNNEX Corporation | 0.81% | 0.53% | 0.53% |
 BURLBurlington Stores, Inc. | 0.50% | 0.64% | 0.50% |
 WCCWESCO International, Inc. | 0.84% | 0.50% | 0.50% |
 PFGCPerformance Food Group Co. | 0.86% | 0.49% | 0.49% |
 ARWArrow Electronics, Inc. | 0.47% | 0.63% | 0.47% |
 JLLJones Lang LaSalle Incorporated | 0.91% | 0.46% | 0.46% |
 EWBCEast West Bancorp, Inc. | 0.46% | 0.49% | 0.46% |
 NLYAnnaly Capital Management, Inc. | 0.97% | 0.45% | 0.45% |
 OVVOvintiv, Inc. | 1.05% | 0.45% | 0.45% |
 PNFPPinnacle Financial Partners, Inc. | 0.83% | 0.44% | 0.44% |
 WPCW. P. Carey Inc. | 0.45% | 0.44% | 0.44% |
 PRPermian Resources Corporation Class A | 1.01% | 0.44% | 0.44% |
 RGAReinsurance Group of America Incorporated | 0.85% | 0.42% | 0.42% |
 CSLCarlisle Companies Incorporated | 0.49% | 0.42% | 0.42% |
 CLHClean Harbors, Inc. | 0.45% | 0.42% | 0.42% |
Showing the top 250 of 290 shared holdings by overlap weight.
Frequently Asked Questions
How much do IJJ and MDY overlap?
IJJ and MDY overlap by 62.0% of portfolio weight. They share 290 holdings (IJJ holds 301 positions and MDY holds 399), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IJJ and MDY?
The two portfolios are 62.0% identical by weight. Owning both mostly doubles down on the shared core rather than diversifying: the same large positions drive both funds.
What are the biggest shared holdings of IJJ and MDY?
The largest positions held by both funds are AA, BJ, FHN, USFD and WSO. Together the top 10 shared positions account for 10% of the total overlap.
What does IJJ own that MDY doesn't?
11 positions (1.8% of IJJ) are unique to IJJ, led by Janus Henderson Group plc, Taylor Morrison Home Corp. and LAMR. In the other direction, 109 positions (36.8% of MDY) are unique to MDY.