IWS vs RSP overlap - what they share and where they differ
IWS and RSP share 44.0% of their weight across 266 common positions, read from what each fund reported to the SEC.
Each week Ploutos reads the reported positions of the largest US equity ETFs and measures, pair by pair, the weight they share: for every stock both funds hold, the smaller of the two weights counts. Two funds tracking the same index land near 100%. A sector fund inside a broad index fund lands at roughly that sector's weight.
IWS and RSP
44.0%
266 shared positions
IWS
iShares Russell Mid-Cap Value ETF
Reported positions cover 100% of the fund, 703 positions · Jun 30, 2026
Top 10: 5.9%·Holdings of IWS
RSP
Invesco S&P 500 Equal Weight ETF
Reported positions cover 100% of the fund, 500 positions · Apr 30, 2026
Top 10: 3.2%·Holdings of RSP
Reported positions cover IWS 100%, RSP 100% of each fund. An overlap cannot exceed the smaller coverage, so a low figure can mean little overlap or thin reporting.
RSP vs IWS side by side
IWSiShares Russell Mid-Cap Value ETF
703
stock positions reported to the SEC
36.7% of its weight is in 437 names RSP does not hold
RSPInvesco S&P 500 Equal Weight ETF
500
stock positions reported to the SEC
47.6% of its weight is in 234 names IWS does not hold
Where each fund's weight sits
Largest sectors for both funds
The widest gap is Technology: RSP has 5.7 points more of it.
The figures side by side
| IWS | RSP | |
|---|---|---|
| Filing date | Jun 30, 2026 | Apr 30, 2026 |
| Stock positions reported | 703 | 500 |
| Weight of the ten largest | 5.9% | 3.2% |
| Largest position | WBD 0.6% | INTC 0.4% |
| Held alone | 437 positions, 36.7% | 234 positions, 47.6% |
| Covered by stock positions | 100% | 100% |
Holdings they share
| Stock | In IWS | In RSP | Counted |
|---|---|---|---|
| ONON SEMICONDUCTOR CORP | 0.34% | 0.33% | 0.33% |
| CNCCENTENE CORP | 0.29% | 0.29% | 0.29% |
| HUMHUMANA INC | 0.47% | 0.27% | 0.27% |
| HPEHEWLETT PACKARD ENTERPRISE COMPANY | 0.59% | 0.26% | 0.26% |
| NUENUCOR CORP | 0.48% | 0.25% | 0.25% |
| COHRCOHERENT CORP | 0.54% | 0.24% | 0.24% |
| KEYSKEYSIGHT TECHNOLOGIES INC | 0.25% | 0.24% | 0.24% |
| STLDSTEEL DYNAMICS INC | 0.28% | 0.24% | 0.24% |
| URIUNITED RENTALS INC | 0.53% | 0.24% | 0.24% |
| WSTWEST PHARMACEUTICAL SERVICES INC | 0.25% | 0.24% | 0.24% |
What each holds alone
The heaviest positions one fund reports and the other does not.
Only in IWS
Only in RSP
Questions people ask
Is IWS the same as RSP?
44.0% of their weight sits in the same 266 holdings. IWS also reports FLEX LTD, LNG, WAB, which the other does not. RSP also reports INTC, STX, AMD, which the other does not.
How is the overlap between IWS and RSP measured?
For every stock both funds report, the smaller of the two weights counts, and the sum is the overlap. The reported positions cover 100% of IWS and 100% of RSP, so the number cannot exceed the smaller coverage.
Which holds more, RSP or IWS?
IWS reports 703 stock positions and RSP reports 500. 36.7% of IWS's weight sits in names RSP does not hold, and 47.6% of RSP's weight in names IWS does not hold. The ten largest positions are 5.9% of IWS and 3.2% of RSP.
How do IWS and RSP differ by sector?
The widest gap is Technology: RSP has 5.7 points more of it. Sectors come from each holding's SIC code in its SEC record, summed by the weight the fund reports.
Where do the numbers come from?
From each fund's own N-PORT filing to the SEC, which lists every position and its weight. The comparison uses every equity position the fund reports; cash, futures and bonds are not counted, which is why a coverage figure sits next to every result. Holdings change between filings.
Add a third fund in the tool·All fund pairs
Descriptive data from public SEC filings. Nothing on this page is a recommendation to buy, sell or hold any fund or stock, and holdings change between filings.