IWM vs SPMD: Holdings Overlap
iShares · 1941 holdings · $82.2B · as of 2026-03-31
SPMDState Street® SPDR® Portfolio S&P 400™ Mid Cap ETF
State Street (SPDR) · 399 holdings · $18.5B · as of 2026-08-06
Holdings snapshots are 128 days apart (IWM: 2026-03-31, SPMD: 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 IWM and SPMD?
iShares Russell 2000 ETF (IWM, by iShares) holds 1941 positions; State Street® SPDR® Portfolio S&P 400™ Mid Cap ETF (SPMD, by State Street (SPDR)) holds 399. They have 95 holdings in common, and by portfolio weight the two funds are 17.5% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 17.5%Sum of the smaller weight of each shared holding
- Shared Holdings
- 95IWM holds 1941 · SPMD holds 399
- Weight in Shared Holdings
- IWM 20%·SPMD 19%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 IWM
1846 of 1941 positions (79.7% of the fund) are not held by SPMD. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWM | SPMD |
|---|---|---|
| Industrials | 17.9% | 26.0% |
| Health Care | 16.6% | 10.3% |
| Financials | 15.3% | 16.1% |
| Information Technology | 13.6% | 15.7% |
| Consumer Discretionary | 8.0% | 11.7% |
| Other Sectors | 22.7% | 25.8% |
| Unclassified | 5.5% | 0.0% |
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. “Unclassified” is weight we could not classify (5% of IWM, 0% of SPMD).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IWM | +1.8% | +23.0% | +38.6% | +17.1% | +7.5% | +10.8% | 0.88% |
| SPMD | +3.1% | +18.5% | +26.0% | +14.6% | +9.1% | +11.3% | 1.19% |
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 IWM vs SPMD →
Shared Holdings(95)
The top 10 shared positions account for 21% of the overlap, led by FN, CDE and STRL.
 FNFabrinet COM USD0.01 | 0.64% | 0.54% | 0.54% |
|---|---|---|---|
 CDECoeur Mining Inc COM NEW | 0.65% | 0.45% | 0.45% |
 STRLSterling Infrastructure Inc COM | 0.41% | 0.45% | 0.41% |
 NXTNextpower Inc. CLASS A COM | 0.60% | 0.40% | 0.40% |
 TTMITTM Technologies Inc COM | 0.34% | 0.39% | 0.34% |
 AEISAdvanced Energy Industries, Inc. COM | 0.41% | 0.34% | 0.34% |
 DYDycom Industries, Inc. COM | 0.34% | 0.67% | 0.34% |
 KTOSKratos Defense & Security Solutions, Inc. COM NEW | 0.43% | 0.30% | 0.30% |
 SPXCSPX Technologies, Inc. COM | 0.33% | 0.29% | 0.29% |
 HLHecla Mining Company COM | 0.40% | 0.29% | 0.29% |
 RMBSRambus Inc. COM | 0.32% | 0.29% | 0.29% |
 ENSGEnsign Group, Inc. (The) | 0.38% | 0.29% | 0.29% |
 ARWRArrowhead Pharmaceuticals Inc COM | 0.29% | 0.33% | 0.29% |
 AHRAmerican Healthcare REIT Inc. COM SHS | 0.29% | 0.29% | 0.29% |
 MOG-AMoog, Inc., Class A | 0.28% | 0.64% | 0.28% |
 UMBFUMB Financial Corporation | 0.28% | 0.28% | 0.28% |
 WTSWatts Water Technologies, Inc., Class A | 0.27% | 0.28% | 0.27% |
 CYTKCytokinetics Incorporated | 0.27% | 0.30% | 0.27% |
 CTRECaretrust Reit Inc COM | 0.28% | 0.27% | 0.27% |
 SITMSitime Corporation COM | 0.26% | 0.42% | 0.26% |
 VIAVViavi Solutions Inc COM | 0.26% | 0.26% | 0.26% |
 ONBOld National Bancorp COM | 0.26% | 0.25% | 0.25% |
 SMTCSemtech Corporation COM | 0.24% | 0.67% | 0.24% |
 HQYHealthequity Inc COM | 0.24% | 0.24% | 0.24% |
 SANMSanmina Corporation | 0.24% | 0.30% | 0.24% |
Frequently Asked Questions
How much do IWM and SPMD overlap?
IWM and SPMD overlap by 17.5% of portfolio weight. They share 95 holdings (IWM holds 1941 positions and SPMD holds 399), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWM and SPMD?
The two portfolios are 17.5% identical by weight. Owning both is not redundant. Most of each portfolio is distinct, so the funds can serve different roles.
What are the biggest shared holdings of IWM and SPMD?
The largest positions held by both funds are FN, CDE, STRL, NXT and TTMI. Together the top 10 shared positions account for 21% of the total overlap.
What does IWM own that SPMD doesn't?
1846 positions (79.7% of IWM) are unique to IWM, led by BE, ECHO and CRDO. In the other direction, 304 positions (86.2% of SPMD) are unique to SPMD.