MDY vs IJJ: Holdings Overlap
MDYState Street® SPDR® S&P MIDCAP 400® ETF Trust
State Street (SPDR) · 399 holdings · $27.1B · as of 2026-08-06
IJJiShares S&P Mid-Cap 400 Value ETF
iShares · 301 holdings · $9.0B · as of 2026-03-31
Holdings snapshots are 128 days apart (MDY: 2026-08-06, IJJ: 2026-03-31). 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 MDY and IJJ?
State Street® SPDR® S&P MIDCAP 400® ETF Trust (MDY, by State Street (SPDR)) holds 399 positions; iShares S&P Mid-Cap 400 Value ETF (IJJ, by iShares) holds 301. 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
- 290MDY holds 399 · IJJ holds 301
- Weight in Shared Holdings
- MDY 68%·IJJ 97%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 MDY
109 of 399 positions (36.8% of the fund) are not held by IJJ. Showing the top 30 by weight.
Sector Breakdown
| Sector | MDY | IJJ |
|---|---|---|
| Industrials | 25.9% | 19.0% |
| Financials | 16.0% | 22.4% |
| Information Technology | 15.6% | 7.0% |
| Consumer Discretionary | 11.6% | 12.4% |
| Health Care | 10.3% | 3.2% |
| Other Sectors | 25.7% | 35.1% |
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 |
|---|---|---|---|---|---|---|---|
| MDY | +3.1% | +18.1% | +25.6% | +14.2% | +8.8% | +10.9% | 0.99% |
| IJJ | +3.0% | +15.1% | +23.8% | +12.8% | +9.2% | +10.5% | 1.56% |
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 MDY vs IJJ →
Shared Holdings(290)
The top 10 shared positions account for 10% of the overlap, led by AA, BJ and FHN.
 AAAlcoa Corporation | 0.68% | 1.09% | 0.68% |
|---|---|---|---|
 BJBJ's Wholesale Club Holdings, Inc. | 0.67% | 0.82% | 0.67% |
 FHNFirst Horizon Corporation | 0.67% | 0.70% | 0.67% |
 USFDUS Foods Holding Corp. | 0.64% | 1.30% | 0.64% |
 WSOWatsco, Inc. | 0.63% | 0.81% | 0.63% |
 ENTGEntegris, Inc. | 0.59% | 0.68% | 0.59% |
 KNXKnight-Swift Transportation Holdings Inc. Class A | 0.62% | 0.59% | 0.59% |
 RSReliance, Inc. | 0.58% | 1.01% | 0.58% |
 OCOwens Corning | 0.65% | 0.57% | 0.57% |
 ILMNIllumina, Inc. | 0.80% | 0.55% | 0.55% |
 SNXTD SYNNEX Corporation | 0.53% | 0.81% | 0.53% |
 BURLBurlington Stores, Inc. | 0.64% | 0.50% | 0.50% |
 WCCWESCO International, Inc. | 0.50% | 0.84% | 0.50% |
 PFGCPerformance Food Group Co. | 0.49% | 0.86% | 0.49% |
 ARWArrow Electronics, Inc. | 0.63% | 0.47% | 0.47% |
 JLLJones Lang LaSalle Incorporated | 0.46% | 0.91% | 0.46% |
 EWBCEast West Bancorp, Inc. | 0.49% | 0.46% | 0.46% |
 NLYAnnaly Capital Management, Inc. | 0.45% | 0.97% | 0.45% |
 OVVOvintiv, Inc. | 0.45% | 1.05% | 0.45% |
 PNFPPinnacle Financial Partners, Inc. | 0.44% | 0.83% | 0.44% |
 WPCW. P. Carey Inc. | 0.44% | 0.45% | 0.44% |
 PRPermian Resources Corporation Class A | 0.44% | 1.01% | 0.44% |
 RGAReinsurance Group of America Incorporated | 0.42% | 0.85% | 0.42% |
 CSLCarlisle Companies Incorporated | 0.42% | 0.49% | 0.42% |
 CLHClean Harbors, Inc. | 0.42% | 0.45% | 0.42% |
Showing the top 250 of 290 shared holdings by overlap weight.
Frequently Asked Questions
How much do MDY and IJJ overlap?
MDY and IJJ overlap by 62.0% of portfolio weight. They share 290 holdings (MDY holds 399 positions and IJJ holds 301), based on each fund's latest SEC-reported holdings.
Is it redundant to own both MDY and IJJ?
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 MDY and IJJ?
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 MDY own that IJJ doesn't?
109 positions (36.8% of MDY) are unique to MDY, led by ATI, TWLO and FTI. In the other direction, 11 positions (1.8% of IJJ) are unique to IJJ.