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Data as of Oct 28, 2026.

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CTAU vs SPY: Differences, Returns & Fees

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CTAU and SPY are measured over different days, and SPY charges 0.09% to CTAU's 0.30%.

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Net assets: $1.0m on Oct 28, 2026 for Corgi U.S. Equities 30% Structured Buffer ETF - August Series, and $814.8bn on Oct 27, 2026 for SPDR S&P 500 ETF Trust.

CTAU on its own →SPY on its own →
At a glance
+0.7%
CTAU total return, since launch, Aug 4, 2026
+13.6%
SPY total return, 1 year
0.30%
CTAU expense ratio
0.09%
SPY expense ratio

Pair scorecard

SPY costs 0.21 points a year less; SPY is far larger, $814.8bn against $1.0m.

CTAU vs SPY: Differences, Returns & Fees
MeasureCTAUSPY
Return
Total return, 1 yearnot published+13.6%
Drawdown
Index fall to the buffer1.6%
Fund price fall to the buffer1.6%
Benchmark
What it tracksSPYS&P 500 Index
The outcome period
Buffer left, in index points30.0% of 30.0%
Days left in the period277
Period endsJul 31, 2027
Cost and size
Expense ratio0.30%0.09%
Net assets, as of Oct 27, 2026$1.0m$814.8bn
Holdings
Holdings in commonnot published
In the S&P 500, by weight100%
Top ten holdings, share of the fund38.1%

Method

Side by side

CTAU Corgi U.S. Equities 30% Structured Buffer ETF - August Series SPY SPDR S&P 500 ETF Trust
Where it sits Buffer ETF Stock ETF
Issuer Corgi State Street
What it is Defined outcome, 30% on SPY Tracks the S&P 500
Total return, 1 year +0.7% (since launch, Aug 4, 2026) +13.6%
Its benchmark over the same days +0.1% (SPY) (since launch, Aug 4, 2026) +13.7% (VOO)
Gap to its benchmark +0.6 pts vs SPY (since launch, Aug 4, 2026) −0.1 pts vs VOO
Expense ratio 0.30% 0.09%
Holdings not read by ETFIQ 504
Net assets, CTAU as of Oct 28, 2026 and SPY as of Oct 27, 2026 $1.0m $814.8bn

CTAU and SPY on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.

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About each fund
CTAU

The fund's price can fall 1.6% from here before the buffer starts absorbing losses, by the issuer's number. In index terms, SPY can fall 1.6% from today's level to the point where the buffer begins. Protection left, in index points: 30.0% of the 30.0% buffer still sits below today's SPY level. 277 days remained on Oct 27, 2026. On Jul 31, 2027 the period ends and a new cap is set.

SPY

SPY tracks the S&P 500. Over the year to Oct 28, 2026 it returned +13.6% with distributions reinvested, against +13.7% 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 27, 2026, 100% of the fund by weight is stocks the S&P 500 also holds, across 504 positions, with the top ten at 38.1%.

Questions people ask

Are CTAU and SPY in the same category?
CTAU is a buffer ETF and SPY is a stock ETF, so they do different jobs. The table compares what both publish: return, cost and holdings.
Which is cheaper, CTAU or SPY?
SPY is cheaper, by 0.21 percentage points a year. That is about $21 on $10,000 held for a year. Fees come from each fund's prospectus.
Other comparisons
CTAU vs IVVCTAU vs VOOCTAU vs SPYMSPY vs XJUNSPY vs UMARPMAY vs SPYPNOV vs SPYSPY vs ZALT
Where to next
CTAU on its own →SPY on its own →Hold both: look the portfolio through →Rankings →SPY dividend history →SPY holdings →Standards and sources →
Sources and dates
CTAU filings on SEC EDGAR ↗
Corgi website ↗
SPY filings on SEC EDGAR ↗
State Street website ↗

Links are sources, not endorsements. A comparison is not a recommendation.

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ETFIQ, CTAU against SPY, data as of Oct 28, 2026. https://etfiq.com/compare/any/ctau-vs-spy

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