IYM vs MDYV: Holdings Overlap
IYMiShares U.S. Basic Materials ETF
iShares · 38 holdings · $1.1B · as of 2026-04-30
MDYVState Street® SPDR® S&P 400™ Mid Cap Value ETF
State Street (SPDR) · 297 holdings · $2.9B · as of 2026-08-06
Holdings snapshots are 98 days apart (IYM: 2026-04-30, MDYV: 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 IYM and MDYV?
iShares U.S. Basic Materials ETF (IYM, by iShares) holds 38 positions; State Street® SPDR® S&P 400™ Mid Cap Value ETF (MDYV, by State Street (SPDR)) holds 297. They have 11 holdings in common, and by portfolio weight the two funds are 4.0% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 4.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 11IYM holds 38 · MDYV holds 297
- Weight in Shared Holdings
- IYM 11%·MDYV 4%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 IYM
27 of 38 positions (89.0% of the fund) are not held by MDYV.
Only in MDYV
286 of 297 positions (95.8% of the fund) are not held by IYM. Showing the top 30 by weight.
Sector Breakdown
| Sector | IYM | MDYV |
|---|---|---|
| Materials | 88.4% | 7.9% |
| Financials | 0.0% | 23.4% |
| Industrials | 11.4% | 18.7% |
| Consumer Discretionary | 0.0% | 12.5% |
| Information Technology | 0.0% | 8.3% |
| Other Sectors | 0.0% | 29.1% |
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 |
|---|---|---|---|---|---|---|---|
| IYM | +5.2% | +23.1% | +34.0% | +13.6% | +9.2% | +10.8% | 1.24% |
| MDYV | +3.1% | +15.2% | +23.9% | +12.9% | +9.2% | +10.6% | 1.64% |
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 IYM vs MDYV →
Shared Holdings(11)
The top 10 shared positions account for 97% of the overlap, led by RS, AA and TKR.
 RSReliance Inc COM | 2.11% | 1.21% | 1.21% |
|---|---|---|---|
 AAAlcoa Corporation COM | 1.83% | 0.71% | 0.71% |
 TKRThe Timken Company COM | 0.77% | 0.46% | 0.46% |
 CLFCleveland-Cliffs Inc COM | 0.64% | 0.40% | 0.40% |
 SOLSSolstice Advanced Materials Inc. COM SHS | 1.45% | 0.26% | 0.26% |
 MLIMueller Industries Inc. COM | 1.63% | 0.24% | 0.24% |
 ASHAshland Inc. COM | 0.27% | 0.19% | 0.19% |
 SMGThe Scotts Miracle-Gro Company CL A | 0.30% | 0.16% | 0.16% |
 MPMP Materials Corp., Class A | 1.05% | 0.15% | 0.15% |
 WLKWestlake Corporation COM | 0.43% | 0.15% | 0.15% |
 OLNOlin Corporation COM PAR $1 | 0.36% | 0.12% | 0.12% |
Frequently Asked Questions
How much do IYM and MDYV overlap?
IYM and MDYV overlap by 4.0% of portfolio weight. They share 11 holdings (IYM holds 38 positions and MDYV holds 297), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IYM and MDYV?
The two portfolios are 4.0% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of IYM and MDYV?
The largest positions held by both funds are RS, AA, TKR, CLF and SOLS. Together the top 10 shared positions account for 97% of the total overlap.
What does IYM own that MDYV doesn't?
27 positions (89.0% of IYM) are unique to IYM, led by LIN, NEM and FCX. In the other direction, 286 positions (95.8% of MDYV) are unique to MDYV.