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Data as of Oct 28, 2026.

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CPSU vs VOO: Differences, Returns & Fees

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Over the year to Oct 28, 2026, CPSU returned +4.5% to VOO's +13.7%, and VOO charges 0.03% to CPSU's 0.69%.

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Net assets: $29m on Oct 28, 2026 for Calamos S&P 500 Structured Alt Protection ETF - June, and $1.0tn on Sep 30, 2026 for Vanguard S&P 500 ETF.

CPSU on its own →VOO on its own →
At a glance
+4.5%
CPSU total return, 1 year
+13.7%
VOO total return, 1 year
0.69%
CPSU expense ratio
0.03%
VOO expense ratio

Pair scorecard

VOO costs 0.66 points a year less; their one-year returns differ by 9.2 points.

CPSU vs VOO: Differences, Returns & Fees
MeasureCPSUVOO
Return
Total return, 1 year+4.5%+13.7%
Drawdown
Index fall to the buffer1.8%
Fund price fall to the buffer1.6%
Benchmark
What it tracksSPYS&P 500 Index
The outcome period
Buffer left, in index points100.0% of 100.0%
Days left in the period212
Period endsMay 28, 2027
Cost and size
Expense ratio0.69%0.03%
Net assets, CPSU as of Oct 28, 2026 and VOO as of Sep 30, 2026$29m$1.0tn
Holdings
Holdings in commonnot published
Top ten holdings, share of the fund39.1%

Method

Side by side

CPSU Calamos S&P 500 Structured Alt Protection ETF - June VOO Vanguard S&P 500 ETF
Where it sits Buffer ETF Stock ETF
Issuer Calamos Vanguard
What it is Defined outcome, 100% on SPY Tracks the S&P 500
Total return, 1 year +4.5% +13.7%
Its benchmark over the same days +12.4% (SPY) +13.7% (IVV)
Gap to its benchmark −7.9 pts vs SPY 0.0 pts vs IVV
Expense ratio 0.69% 0.03%
Holdings not read by ETFIQ 507
Net assets, CPSU as of Oct 28, 2026 and VOO as of Sep 30, 2026 $29m $1.0tn

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

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About each fund
CPSU

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 1.8% 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. 212 days remained on Oct 28, 2026. On May 28, 2027 the period ends and a new cap is set.

VOO

VOO tracks the S&P 500. Over the year to Oct 28, 2026 it returned +13.7% with distributions reinvested, against +13.7% for its benchmark, the S&P 500 Index. The prospectus expense ratio is 0.03% a year. By its holdings published by its issuer as of Sep 30, 2026, 100% of the fund by weight is stocks the S&P 500 also holds, across 507 positions, with the top ten at 39.1%.

Questions people ask

Are CPSU and VOO in the same category?
CPSU is a buffer ETF and VOO 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, CPSU or VOO?
In the year to Oct 28, 2026, with distributions reinvested, CPSU returned +4.5% and VOO +13.7%.
Which is cheaper, CPSU or VOO?
VOO 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
CPSU vs IVVCPSU vs SPYCPSU vs SPYMTAPR vs VOOPMJN vs VOOPMNV vs VOOPMDE vs VOOPQX vs VOO
Where to next
S&P 500 (SPY) →CPSU on its own →VOO on its own →Hold both: look the portfolio through →Rankings →VOO dividend history →VOO holdings →Standards and sources →
Sources and dates
CPSU filings on SEC EDGAR ↗
Calamos website ↗
VOO filings on SEC EDGAR ↗
VOO prospectus with the expense ratio (SEC) ↗
Vanguard page for VOO ↗

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

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ETFIQ, CPSU against VOO, data as of Oct 28, 2026. https://etfiq.com/compare/any/cpsu-vs-voo

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