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Data as of Oct 28, 2026.

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Across categories

CPST vs IVV: Differences, Returns & Fees

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Over the year to Oct 28, 2026, CPST returned +4.9% to IVV's +13.7%, and IVV charges 0.03% to CPST's 0.69%.

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Net assets: $41m on Oct 28, 2026 for Calamos S&P 500 Structured Alt Protection ETF - September, and $885.1bn on Oct 27, 2026 for iShares Core S&P 500 ETF.

CPST on its own →IVV on its own →
At a glance
+4.9%
CPST total return, 1 year
+13.7%
IVV total return, 1 year
0.69%
CPST expense ratio
0.03%
IVV expense ratio

Pair scorecard

IVV costs 0.66 points a year less; their one-year returns differ by 8.8 points; IVV is far larger, $885.1bn against $41m.

CPST vs IVV: Differences, Returns & Fees
MeasureCPSTIVV
Return
Total return, 1 year+4.9%+13.7%
Drawdown
Index fall to the buffer1.4%
Fund price fall to the buffer0.5%
Benchmark
What it tracksSPYS&P 500
The outcome period
Buffer left, in index points100.0% of 100.0%
Days left in the period307
Period endsAug 31, 2027
Cost and size
Expense ratio0.69%0.03%
Net assets, as of Oct 27, 2026$41m$885.1bn
Holdings
Holdings in commonnot published
Top ten holdings, share of the fund38.1%

Method

Side by side

CPST Calamos S&P 500 Structured Alt Protection ETF - September IVV iShares Core S&P 500 ETF
Where it sits Buffer ETF Stock ETF
Issuer Calamos iShares
What it is Defined outcome, 100% on SPY Tracks the S&P 500
Total return, 1 year +4.9% +13.7%
Its benchmark over the same days +12.4% (SPY) +13.6% (SPY)
Gap to its benchmark −7.5 pts vs SPY +0.1 pts vs SPY
Expense ratio 0.69% 0.03%
Holdings not read by ETFIQ 505
Net assets, CPST as of Oct 28, 2026 and IVV as of Oct 27, 2026 $41m $885.1bn

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

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About each fund
CPST

The fund's price can fall 0.5% from here before the buffer starts absorbing losses, by the issuer's number. In index terms, SPY can fall 1.4% from today's level to the point where the buffer begins. Protection left, in index points: 100.0% of the 100.0% buffer still sits below today's SPY level. 307 days remained on Oct 28, 2026. On Aug 31, 2027 the period ends and a new cap is set.

IVV

IVV tracks the S&P 500. Over the year to Oct 28, 2026 it returned +13.7% with distributions reinvested, against +13.6% for its benchmark, the S&P 500. The prospectus expense ratio is 0.03% 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 505 positions, with the top ten at 38.1%.

Questions people ask

Are CPST and IVV in the same category?
CPST is a buffer ETF and IVV is a stock ETF, so they do different jobs. The table compares what both publish: return, cost and holdings.
Which returned more over the last year, CPST or IVV?
In the year to Oct 28, 2026, with distributions reinvested, CPST returned +4.9% and IVV +13.7%.
Which is cheaper, CPST or IVV?
IVV is cheaper, by 0.66 percentage points a year. That is about $66 on $10,000 held for a year. Fees come from each fund's prospectus.
Other comparisons
CPST vs SPYCPST vs VOOCPST vs SPYMIVV vs ZNOVIVV vs ZMARDDSQ vs IVVIVV vs TJULIVV vs JUNT
Where to next
S&P 500 (SPY) →CPST on its own →IVV on its own →Hold both: look the portfolio through →Rankings →IVV dividend history →IVV holdings →Standards and sources →
Sources and dates
CPST filings on SEC EDGAR ↗
Calamos website ↗
IVV filings on SEC EDGAR ↗
IVV prospectus with the expense ratio (SEC) ↗
iShares page for IVV ↗

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

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ETFIQ, CPST against IVV, data as of Oct 28, 2026. https://etfiq.com/compare/any/cpst-vs-ivv

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