Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
IGM vs SPY: how they differ
IGM and SPY hold 46% of their weight in the same names, and IGM returned more over the year.
iShares Expanded Tech Sector ETF and SPDR S&P 500 ETF Trust.
What they hold in common
By the books each fund has filed, IGM and SPY hold 46% of their money in the same securities at the same weight.
| Holding | IGM | SPY |
|---|---|---|
| NVIDIA Corp. | 7.97% | 7.52% |
| Apple, Inc. | 7.92% | 6.59% |
| Microsoft Corp. | 7.50% | 4.30% |
| Alphabet, Inc. | 4.45% | 3.25% |
| Broadcom, Inc. | 7.61% | 2.77% |
| Alphabet, Inc. | 3.55% | 2.59% |
| Micron Technology, Inc. | 5.47% | 2.02% |
| Meta Platforms, Inc. | 4.17% | 1.92% |
| Advanced Micro Devices, Inc. | 4.13% | 1.47% |
| Intel Corp. | 2.88% | 1.02% |
| Applied Materials, Inc. | 2.50% | 0.89% |
| Lam Research Corp. | 2.37% | 0.84% |
| Only in IGM | Only in SPY |
|---|---|
| Shopify, Inc. 0.61% | Amazon.com, Inc. 3.62% |
| Snowflake, Inc. 0.38% | Tesla, Inc. 1.84% |
| Cloudflare, Inc. 0.34% | Eli Lilly & Co. 1.47% |
| Astera Labs, Inc. 0.28% | Berkshire Hathaway, Inc. 1.42% |
| Credo Technology Group Holding Ltd. 0.19% | JPMorgan Chase & Co. 1.36% |
| Celestica, Inc. 0.18% | Johnson & Johnson 0.95% |
| ROBLOX Corp. 0.16% | Visa, Inc. 0.88% |
| Twilio, Inc. 0.14% | Exxon Mobil Corp. 0.88% |
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 | SPY SPDR S&P 500 ETF Trust | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | iShares | State Street |
| What it is | Expanded Tech Sector | S&P 500, book from IVV |
| Total return, 1 year | +32.7% | +17.5% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | +15.2 pts | 0.0 pts |
| Expense ratio | 0.37% | 0.09% |
| Already in the S&P 500 | 92.0% | 100.0% |
| Holdings | 295 | 504 |
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.
SPY in plain words
SPY is an index equity fund tracking the S&P 500. Over the year to Sep 11, 2026 it returned +17.5% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.09% a year. By its holdings filed for Jun 30, 2026, 100% of the fund by weight is stocks the S&P 500 also holds, across 504 positions, with the top ten at 36.4%.
Questions people ask
- Which returned more over the last year, IGM or SPY?
- In the year to Sep 12, 2026, with distributions reinvested, IGM returned +32.7% and SPY returned +17.5%, so IGM returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, IGM or SPY?
- IGM charges 0.37% a year and SPY charges 0.09%, so SPY is cheaper. Fees come from each fund's prospectus.
- How much do IGM and SPY overlap with the S&P 500?
- By their latest filed holdings, 92% of IGM and 100% of SPY by weight is stocks the S&P 500 already holds. Between the two funds, 46% of their books are the same securities at the same weight.
Other comparisons
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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 SPY, data as of Sep 12, 2026. https://etfiq.com/compare/any/IGM-SPY Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources