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CPST · ARCA · ETF

Calamos S&P 500 Structured Alt Protection ETF September (CPST) Price, Holdings & Fees

$1,623.92+1.71%+$27.34End-of-day price as of Oct 9, 2026

Calamos S&P 500 Structured Alt Protection ETF September (CPST) closed at $1,623.92 on Oct 9, 2026, up 1.71% from the previous close of $1,596.58.

Share price, past year

1Y +29.18%

52-week range $1,221.63 – $1,623.92. Daily closing prices.
Monthly closing prices
Last closing price of each month
DateClose
Oct 9, 2026$1,623.92
Sep 30, 2026$1,564.60
Aug 31, 2026$1,544.51
Jul 31, 2026$1,557.41
Jun 30, 2026$1,559.79
May 29, 2026$1,556.32
Apr 30, 2026$1,473.19
Mar 31, 2026$1,455.18
Feb 27, 2026$1,413.54
Jan 30, 2026$1,380.86
Dec 31, 2025$1,336.67
Nov 28, 2025$1,242.91
Oct 31, 2025$1,275.21

Key statistics

Expense ratio
0.69%
as of Nov 30, 2025
Net assets
$32.2M
as of Jul 31, 2026
Holdings
3
as of Jul 31, 2026
52-week range
$1,221.63 – $1,623.92

Calamos S&P 500 Structured Alt Protection ETF September's expense ratio is 0.69%: $69.00 a year on $10,000 invested.

Holdings

Calamos S&P 500 Structured Alt Protection ETF September held 3 investments worth $32.18M as of Jul 31, 2026. Its largest holding was Goldman Sachs & Co. LLC, at 108.90% of the fund.

Calamos S&P 500 Structured Alt Protection ETF September largest holdings by share of net assets
#Holding% of fundValue
1Goldman Sachs & Co. LLC108.90%$35.05M
2Goldman Sachs & Co. LLC0.09%$30.12K
3Goldman Sachs & Co. LLC−9.26%−$2.98M

Top 3 of 3 holdings, as of Jul 31, 2026. Percentages are of the fund's net assets.

What the fund owns

Calamos S&P 500 Structured Alt Protection ETF September holdings by asset type
Asset type% of fund
Derivatives99.73%
Calamos S&P 500 Structured Alt Protection ETF September holdings by country, largest 1
Country% of fund
United States99.73%

Shares of net assets from the fund's N-PORT report. Funds that borrow can add up to more than 100%, with borrowing (such as repurchase agreements) shown as a negative share.

Monthly total returns

Over the 3 months to Jul 31, 2026, Calamos S&P 500 Structured Alt Protection ETF September's total return was +1.60%, as reported to the SEC.

Calamos S&P 500 Structured Alt Protection ETF September monthly total returns
MonthTotal return
Jul 31, 2026+0.47%
Jun 30, 2026+0.36%
May 31, 2026+0.76%

The fund's own total returns as reported to the SEC (N-PORT), including reinvested distributions. Not the sample prices above.

Fund profile

Name
Calamos S&P 500 Structured Alt Protection ETF September
Ticker
CPST
Exchange
ARCA
Fund type
ETF
Trust
Calamos ETF Trust
SEC series ID
S000084799
SEC CIK
0001579881
Fractional shares
No

Recent SEC filings

Shareholder reports and prospectuses are filed by Calamos ETF Trust, the trust behind Calamos S&P 500 Structured Alt Protection ETF September, and cover all of its funds.

Frequently asked questions

What is CPST's price?

Calamos S&P 500 Structured Alt Protection ETF September (CPST) closed at $1,623.92 on Oct 9, 2026, up 1.71% from the previous close of $1,596.58.

What is CPST's expense ratio?

Calamos S&P 500 Structured Alt Protection ETF September's expense ratio is 0.69%: $69.00 a year on $10,000 invested.

What does CPST hold?

Calamos S&P 500 Structured Alt Protection ETF September held 3 investments worth $32.18M as of Jul 31, 2026. Its largest holding was Goldman Sachs & Co. LLC, at 108.90% of the fund. Its five largest holdings were Goldman Sachs & Co. LLC, Goldman Sachs & Co. LLC, Goldman Sachs & Co. LLC.

How has CPST performed?

Over the 3 months to Jul 31, 2026, Calamos S&P 500 Structured Alt Protection ETF September's total return was +1.60%, as reported to the SEC.

Sources and methodology

Holdings, net assets and monthly returns come from the fund's N-PORT filing with the SEC, as of Jul 31, 2026 (filed Sep 29, 2026). The expense ratio is from the fund's prospectus or shareholder report, as of Nov 30, 2025. Prices are generated sample data for development. Data sources and disclosures