# CPSO (Calamos S&P 500 ® Structured Alt Protection ETF - October)

Calamos · Buffer ETFs · data as of Sep 11, 2026

As of Sep 11, 2026, CPSO has reached its cap.

## Key facts

- CPSO, fall before the buffer: 5.8%, as of Sep 11, 2026.
- CPSO, protection left, index points: 99.4%, as of Sep 11, 2026.
- CPSO, days to reset: 19, as of Sep 11, 2026.
- CPSO, net assets: $28m (issuer page, as of Sep 11, 2026).
- CPSO, expense ratio: 0.69% (issuer page, Sep 13, 2026).
- CPSO, reference index: SPY, as of Sep 11, 2026.

## CPSO over each window to Sep 11, 2026

| Window | Total return | SPY | Gap to SPY |
| --- | --- | --- | --- |
| 3 months | +1.7% | +3.3% | −1.6 pts |
| 6 months | +4.4% | +16.0% | −11.6 pts |
| 1 year | +5.7% | +17.5% | −11.8 pts |

## Every published field

| Field | Value | Source |
| --- | --- | --- |
| Reference index | SPY | ETFIQ |
| Buffer | 1% to 100% | ETFIQ |
| Outcome period | Oct 1, 2025 to Oct 2, 2026 | ETFIQ |
| Starting cap | +5.8% | ETFIQ |
| SPY return since period start | +14.3% | ETFIQ |
| Fund return since period start | +5.5% | ETFIQ |
| Net assets | $28m | issuer page, as of Sep 11, 2026 |
| Band state today | At cap | ETFIQ |
| Can still gain | not published | issuer, fund price |
| Fall before buffer | 5.8% | issuer, fund price |
| Fall to the buffer in index terms | 13.1% | ETFIQ |
| Protection left in index points | 99.4% of 99.4% | ETFIQ |
| Days left in period | 19 | ETFIQ |
| Expense ratio | 0.69% | issuer page, Sep 13, 2026 |

## Questions

### How much can CPSO still gain?

Nothing more in index terms on Sep 11, 2026. SPY has already passed the cap of +5.8% for this period, which runs from Oct 1, 2025 to Oct 2, 2026.

### How far can CPSO fall before the buffer helps?

5.8% in fund-price terms on Sep 11, 2026, by the issuer's figure. In index terms SPY can fall 13.1% from that level before the buffer begins. Losses until that point are the holder's.

### How much of the CPSO buffer is left?

99.4% of the 99.4% buffer sat below the SPY level on Sep 11, 2026. That is an ETFIQ calculation in index points, on one definition for every issuer.

### When does CPSO reset?

The outcome period ends on Oct 2, 2026, 19 days from the data on Sep 11, 2026. A new cap is set the next day and the buffer starts again.

### What does CPSO cost?

The prospectus expense ratio is 0.69% a year.


## Cite this page

ETFIQ, CPSO, data as of Sep 11, 2026. https://etfiq.com/funds/cpso
Free to use with attribution; the underlying files are at https://etfiq.com/data/.

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