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SPY vs USMC: Differences, Returns & Fees

SPY and USMC hold 46% of their weight in the same names, and SPY returned +17.3% over the year. Net assets on Oct 8, 2026: $817.2bn for SPDR S&P 500 ETF Trust and $5.2bn for Principal U.S. Mega-Cap ETF.

SPY costs 0.03 points a year less; their one-year returns differ by 2.5 points; SPY is far larger, $817.2bn against $5.2bn.

SPY vs USMC: Differences, Returns & Fees
SPYUSMC
Expense ratio0.09%0.12%
Net assets, as of Oct 8, 2026$817.2bn$5.2bn
Total return, 1 year+17.3%+14.8%
What it tracksS&P 500 IndexNo index, actively managed
Holdings in common46%
Top ten holdings, share of the fund39.1%54.3%

Holdings in common uses holdings dated Jun 30, 2026 and Oct 8, 2026.

+17.3%
SPY total return, 1 year
+14.8%
USMC total return, 1 year
0.09%
SPY expense ratio
0.12%
USMC expense ratio

What they hold in common

By the books each fund has filed, SPY and USMC hold 46% of their money in the same securities at the same weight. Above 50%, holding both is close to holding one of them twice. Holdings dated Jun 30, 2026 and Oct 8, 2026.

half

46% in common

Positions both hold, largest shared weight first
Holding SPY USMC
NVIDIA CORP 8.34% 7.54%
APPLE INC 7.42% 6.63%
MICROSOFT CORP 5.80% 4.30%
AMAZON.COM INC 3.73% 3.60%
ALPHABET INC CL A 3.06% 5.80%
BROADCOM INC 2.56% 4.77%
META PLATFORMS INC CLASS A 2.38% 3.51%
MICRON TECHNOLOGY INC 1.75% 8.75%
TESLA INC 1.58% 2.31%
BERKSHIRE HATHAWAY INC CL B 1.42% 3.10%
ELI LILLY + CO 1.40% 2.52%
JPMORGAN CHASE + CO 1.32% 4.40%
Only in SPY
ALPHABET INC CL C 2.45%
ADVANCED MICRO DEVICES 1.51%
EXXONMOBIL HOLDINGS CORP 1.04%
INTEL CORP 0.80%
PALANTIR TECHNOLOGIES INC A 0.68%
CISCO SYSTEMS INC 0.68%
APPLIED MATERIALS INC 0.60%
LAM RESEARCH CORP 0.60%
Only in USMC
Exxon Mobil Corp 1.99%

Check overlap with more funds →

On the same fields

SPY
SPDR S&P 500 ETF Trust
USMC
Principal U.S. Mega-Cap ETF
Where it sits Stock ETF Stock ETF
Issuer State Street Principal
What it is Tracks the S&P 500 Actively managed
Total return, 1 year +17.3% +14.8%
Its benchmark over the same days +17.3% (VOO) +17.3% (VOO)
Gap to its benchmark −0.1 pts vs VOO −2.5 pts vs VOO
Expense ratio 0.09% 0.12%
Already in the S&P 500 99.8% 99.8%
Holdings 504 26
Net assets, as of Oct 8, 2026 $817.2bn $5.2bn

SPY and USMC on the fields both publish, as of Oct 9, 2026. Source: ETFIQ.

About SPY

SPY tracks the S&P 500. Over the year to Oct 9, 2026 it returned +17.3% with distributions reinvested, against +17.3% for its benchmark, the S&P 500 Index. The prospectus expense ratio is 0.09% a year. By its holdings published by its issuer for Oct 8, 2026, 100% of the fund by weight is stocks the S&P 500 also holds, across 504 positions, with the top ten at 39.1%.

About USMC

USMC is actively managed and tracks no index. Over the year to Oct 9, 2026 it returned +14.8% with distributions reinvested, against +17.3% for its benchmark, the S&P 500 Index. The prospectus expense ratio is 0.12% 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 26 positions, with the top ten at 54.3%.

Questions people ask

Which returned more over the last year, SPY or USMC?
In the year to Oct 9, 2026, with distributions reinvested, SPY returned +17.3% and USMC +14.8%.
Which is cheaper, SPY or USMC?
SPY is cheaper, by 0.03 percentage points a year. That is about $3 on $10,000 held for a year. Fees come from each fund's prospectus.
How much do SPY and USMC overlap with the S&P 500?
By their latest filed holdings, 100% of SPY and 100% of USMC by weight is stocks the S&P 500 already holds.
Other comparisons
SPY vs XLGCGUS vs SPYDFAU vs SPYESGV vs SPYIVV vs USMCUSMC vs VTIUSMC vs VOOSPYM vs USMC
SPY on its own →USMC on its own →Hold both: look the portfolio through →Rankings →Standards and sources →
Where these figures came from
SPY filings on SEC EDGAR ↗State Street website ↗USMC filings on SEC EDGAR ↗USMC prospectus with the expense ratio (SEC) ↗Principal website ↗

ETFIQ links to the documents behind every figure; a link is not an endorsement. A comparison is not a recommendation.

How this is computed

Overlap adds up the smaller of the two weights for each security both funds hold.

Cite this pageCitation, APA and Markdown

ETFIQ, SPY against USMC, data as of Oct 9, 2026. https://etfiq.com/compare/any/spy-vs-usmc

Open data

Free to use with attribution for figures ETFIQ computes; issuer data stays under its owner's terms.