Data as of .
CPST vs ZSEP: which one stands where?
As of Sep 21, 2026 ZSEP can fall 0.3% before its buffer engages and CPST 0.2%.
Where each one stands today
CPST resets first, on Aug 31, 2027, 344 days from now; ZSEP runs to Aug 31, 2027, 344 days. A fall from here reaches CPST’s buffer after 0.2% and ZSEP’s after 0.3%. Both track SPY, so what separates them is where each is in its own period.
Every figure is ETFIQ’s own, from the issuer’s published outcome-period terms. A buffer ETF holds FLEX options on its reference index rather than shares, so there is no holdings overlap between two of them to report.
Performance, window by window
| Window | Total return | Gap to the reference | ||
|---|---|---|---|---|
| CPST | ZSEP | CPST | ZSEP | |
| 3 months | +1.1% | +1.2% | −1.2 pts | −1.1 pts |
| 6 months | +4.1% | +4.3% | −14.0 pts | −13.7 pts |
| 1 year | +5.0% | +4.9% | −11.6 pts | −11.6 pts |
| CPST Calamos S&P 500 ® Structured Alt Protection ETF - September Absorbs the whole loss on SPY and caps the gain at 8.0%, over a period ending Aug 31, 2027 | ZSEP Innovator Equity Defined Protection ETF - 1 Yr September Absorbs the whole loss on SPY and caps the gain at 8.9%, over a period ending Aug 31, 2027 | |
|---|---|---|
| Issuer | Calamos | Innovator |
| Reference index | SPY | SPY |
| Buffer | 100% | 100% |
| Outcome period | Sep 1, 2026 to Aug 31, 2027 | Aug 31, 2026 to Aug 31, 2027 |
| Days left | 344 | 344 |
| Starting cap | +8.0% | +8.9% |
| Can still gain | not published | 8.5% |
| Fall before buffer | 0.2% | 0.3% |
| Protection left, index points | 100.0% of 100.0% | 100.0% of 100.0% |
| Index return this period | 0.0% | +0.9% |
| Fund return this period | +0.1% | +0.3% |
| State today | Buffer working | Open |
| Expense ratio | 0.69% | 0.79% |
| Net assets | $37m | $220m |
CPST in plain words
The fund's price can fall 0.2% from here before the buffer starts absorbing losses, by the issuer's figure. In index terms, SPY can fall 0.0% 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. 344 days remained on Sep 21, 2026. On Aug 31, 2027 the period ends and a new cap is set.
ZSEP in plain words
From its price on Sep 21, 2026, the fund can gain about 8.5% more before it reaches its cap. The fund's price can fall 0.3% from here before the buffer starts absorbing losses, by the issuer's figure. In index terms, SPY can fall 0.9% from today's level to the point where the buffer begins.
Questions people ask
- Which resets first, CPST or ZSEP?
- CPST ends its outcome period on Aug 31, 2027 and ZSEP on Aug 31, 2027. A new cap is set the day after each.
- Which is cheaper, CPST or ZSEP?
- CPST charges 0.69% a year and ZSEP charges 0.79%, so CPST is cheaper. Fees come from each fund's prospectus.
Other comparisons
Where these figures came from
ETFIQ links to the documents behind every figure. It is not affiliated with any issuer, and a link is not an endorsement.
Cite this page. ETFIQ, CPST against ZSEP, data as of Sep 21, 2026. https://etfiq.com/compare/buffer/cpst-vs-zsep Free to use with attribution; the underlying files are at Open data.