IYW vs MGK overlap - what they share and where they differ
IYW and MGK share 70.4% of their weight across 27 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.
IYW and MGK
70.4%
27 shared positions
IYW
iShares U.S. Technology ETF
Reported positions cover 100% of the fund, 148 positions · Jul 31, 2026
Top 10: 67.3%·Holdings of IYW
MGK
VANGUARD MEGA CAP GROWTH INDEX FUND
Reported positions cover 100% of the fund, 55 positions · Jun 30, 2026
Top 10: 66.8%·Holdings of MGK
Reported positions cover IYW 100%, MGK 100% of each fund. An overlap cannot exceed the smaller coverage, so a low figure can mean little overlap or thin reporting.
MGK vs IYW side by side
IYWiShares U.S. Technology ETF
148
stock positions reported to the SEC
19.7% of its weight is in 121 names MGK does not hold
MGKVANGUARD MEGA CAP GROWTH INDEX FUND
55
stock positions reported to the SEC
27.6% of its weight is in 28 names IYW does not hold
Where each fund's weight sits
Largest sectors for both funds
The widest gap is Technology: IYW has 24.7 points more of it.
The figures side by side
| IYW | MGK | |
|---|---|---|
| Filing date | Jul 31, 2026 | Jun 30, 2026 |
| Stock positions reported | 148 | 55 |
| Weight of the ten largest | 67.3% | 66.8% |
| Largest position | NVDA 13.7% | NVDA 13.3% |
| Held alone | 121 positions, 19.7% | 28 positions, 27.6% |
| Covered by stock positions | 100% | 100% |
Holdings they share
| Stock | In IYW | In MGK | Counted |
|---|---|---|---|
| NVDANVIDIA CORPORATION | 13.65% | 13.27% | 13.27% |
| AAPLAPPLE INC. | 13.15% | 12.17% | 12.17% |
| GOOGLALPHABET INC. | 11.23% | 10.58% | 10.58% |
| MSFTMICROSOFT CORPORATION | 10.68% | 7.50% | 7.50% |
| AVGOBROADCOM INC. | 4.62% | 4.27% | 4.27% |
| METAMETA PLATFORMS, INC. | 3.79% | 4.08% | 3.79% |
| AMDADVANCED MICRO DEVICES, INC. | 3.06% | 3.19% | 3.06% |
| LRCXLAM RESEARCH CORPORATION | 1.91% | 1.92% | 1.91% |
| KLACKLA CORPORATION | 1.25% | 1.48% | 1.25% |
| AMATAPPLIED MATERIALS, INC. | 2.10% | 1.13% | 1.13% |
What each holds alone
The heaviest positions one fund reports and the other does not.
Only in IYW
Only in MGK
Questions people ask
Is IYW the same as MGK?
70.4% of their weight sits in the same 27 holdings. IYW also reports MU, TXN, IBM, which the other does not. MGK also reports AMZN, TSLA, LLY, which the other does not.
How is the overlap between IYW and MGK 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 IYW and 100% of MGK, so the number cannot exceed the smaller coverage.
Which holds more, MGK or IYW?
IYW reports 148 stock positions and MGK reports 55. 19.7% of IYW's weight sits in names MGK does not hold, and 27.6% of MGK's weight in names IYW does not hold. The ten largest positions are 67.3% of IYW and 66.8% of MGK.
How do IYW and MGK differ by sector?
The widest gap is Technology: IYW has 24.7 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.
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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.