Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
IGM vs VO: how they differ
IGM and VO hold 8% of their weight in the same names, and IGM returned more over the year.
iShares Expanded Tech Sector ETF and Vanguard Mid-Cap Index Fund.
What they hold in common
By the books each fund has filed, IGM and VO hold 8% of their money in the same securities at the same weight.
| Holding | IGM | VO |
|---|---|---|
| Western Digital Corp. | 0.96% | 1.07% |
| Fortinet, Inc. | 0.42% | 0.46% |
| Snowflake, Inc. | 0.38% | 0.41% |
| Datadog, Inc. | 0.38% | 0.84% |
| Cloudflare, Inc. | 0.34% | 0.76% |
| Coherent Corp. | 0.34% | 0.75% |
| Teradyne, Inc. | 0.33% | 0.73% |
| Ciena Corp. | 0.30% | 0.67% |
| Motorola Solutions, Inc. | 0.30% | 0.67% |
| Monolithic Power Systems, Inc. | 0.30% | 0.63% |
| Lumentum Holdings, Inc. | 0.29% | 0.65% |
| Astera Labs, Inc. | 0.28% | 0.36% |
| Only in IGM | Only in VO |
|---|---|
| NVIDIA Corp. 7.97% | Vertiv Holdings Co 1.23% |
| Apple, Inc. 7.92% | Seagate Technology Holdings PLC 1.05% |
| Broadcom, Inc. 7.61% | Quanta Services Inc 1.05% |
| Microsoft Corp. 7.50% | Howmet Aerospace Inc 1.04% |
| Micron Technology, Inc. 5.47% | Cummins Inc 0.95% |
| Alphabet, Inc. 4.45% | Bloom Energy Corp 0.79% |
| Meta Platforms, Inc. 4.17% | Constellation Energy Corp 0.78% |
| Advanced Micro Devices, Inc. 4.13% | Robinhood Markets Inc 0.77% |
Weight overlap is an ETFIQ calculation: for every security both funds hold, the smaller of the two weights, summed. Above 50%, holding both is close to holding one of them twice. Holdings dated Jun 30, 2026.
| IGM iShares Expanded Tech Sector ETF | VO Vanguard Mid-Cap Index Fund | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | iShares | Vanguard |
| What it is | Expanded Tech Sector | Mid-Cap |
| Total return, 1 year | +32.7% | +12.0% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | +15.2 pts | −5.5 pts |
| Expense ratio | 0.37% | 0.03% |
| Already in the S&P 500 | 92.0% | 91.4% |
| Holdings | 295 | 282 |
IGM in plain words
IGM is an index equity fund tracking the Expanded Tech Sector. Over the year to Sep 11, 2026 it returned +32.7% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.37% a year. By its holdings filed for Jun 30, 2026, 92% of the fund by weight is stocks the S&P 500 also holds, across 295 positions, with the top ten at 55.7%. It sat 5.1% below its high of Jun 2, 2026 on Sep 11, 2026.
VO in plain words
VO is an index equity fund tracking the Mid-Cap. Over the year to Sep 11, 2026 it returned +12.0% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.03% a year. By its holdings filed for Jun 30, 2026, 91% of the fund by weight is stocks the S&P 500 also holds, across 282 positions, with the top ten at 9.6%. It sat 4.1% below its high of Aug 14, 2026 on Sep 11, 2026.
Questions people ask
- Which returned more over the last year, IGM or VO?
- In the year to Sep 12, 2026, with distributions reinvested, IGM returned +32.7% and VO returned +12.0%, so IGM returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, IGM or VO?
- IGM charges 0.37% a year and VO charges 0.03%, so VO is cheaper. Fees come from each fund's prospectus.
- How much do IGM and VO overlap with the S&P 500?
- By their latest filed holdings, 92% of IGM and 91% of VO by weight is stocks the S&P 500 already holds. Between the two funds, 8% of their books are the same securities at the same weight.
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Where these figures came from
ETFIQ links to the documents behind every figure. It is not affiliated with any issuer, and a link is not an endorsement.
Cite this page. ETFIQ, IGM against VO, data as of Sep 12, 2026. https://etfiq.com/compare/any/IGM-VO Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources