BSEP vs CPST: Cap, Buffer & Days Left
As of Oct 13, 2026 BSEP can fall 1.4% before its buffer engages and CPST 0.5%. Net assets on Oct 12, 2026: $470m for Innovator U.S. Equity Buffer ETF - Sep and $41m for Calamos S&P 500 ® Structured Alt Protection ETF - September.
CPST costs 0.10 points a year less; their one-year returns differ by 9.3 points; BSEP is 11.4 times larger.
Points (pts) are percentage points.
| BSEP | CPST | |
|---|---|---|
| Expense ratio | 0.79% | 0.69% |
| Net assets, as of Oct 12, 2026 | $470m | $41m |
| Total return, 1 year | +15.0% | +5.7% |
| What it tracks | SPY | SPY |
| Holdings in common | not published | |
| Index fall to the buffer | 1.3% | 2.1% |
BSEP: reference +1.3% since period start, fund +1.4%; buffer 0 to −9; cap +19.8%; Between buffer and cap. Figures to Oct 13, 2026.
BSEP: reference +1.3% since period start, fund +1.4%; buffer 0 to −9; cap +19.8%; Between buffer and cap. Figures to Oct 13, 2026.
CPST: reference +2.1% since period start, fund +0.5%; buffer Floor; cap +8.1%; Full floor. Figures to Oct 13, 2026.
Figures to Oct 13, 2026.
These are two different products. CPST is a floor fund, which caps how far a holder can fall. BSEP is a buffer fund, which absorbs the first part of a fall and leaves everything below it with the holder.
Where each one stands today
BSEP resets first, on Aug 31, 2027, 322 days from now; CPST runs to Aug 31, 2027, 322 days. A fall from here reaches BSEP’s buffer after 1.4% and CPST’s after 0.5%. Both track SPY, so what separates them is where each is in its own period.
Performance, window by window
| Total return | Gap to the reference's price return | |||
|---|---|---|---|---|
| Window | BSEP | CPST | BSEP | CPST |
| 3 months | +3.4% | +1.3% | −0.4 pts | −2.6 pts |
| 6 months | +9.6% | +3.4% | −3.8 pts | −10.0 pts |
| 1 year | +15.0% | +5.7% | −4.2 pts | −13.4 pts |
| 3 years | +61.7% | not published | −18.6 pts | not published |
| Since launch Not the same days: BSEP Sep 2019 · CPST Sep 2024 | +126.7% | +14.1% | −40.9 pts | −26.8 pts |
Each fund's gap is to its reference's price return, dividends left out: the basis the outcome period uses. Source: ETFIQ. Open this comparison in the app →
On the same fields
As of Oct 13, 2026. Source: ETFIQ.
About BSEP
From its price on Oct 13, 2026, the fund can gain about 18.1% more before it reaches its cap. The fund's price can fall 1.4% from here before the buffer starts absorbing losses, by the issuer's figure. In index terms, SPY can fall 1.3% from today's level to the point where the buffer begins. Protection left, in index points: 9.0% of the 9.0% buffer still sits below today's SPY level. 322 days remained on Oct 13, 2026. On Aug 31, 2027 the period ends and a new cap is set.
About CPST
The fund's price can fall 0.5% from here before the buffer starts absorbing losses, by the issuer's figure. In index terms, SPY can fall 2.1% 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.
Questions people ask
ETFIQ links to the documents behind every figure; a link is not an endorsement. A comparison is not a recommendation.
How this is computed
ETFIQ calculates every figure from each issuer’s published outcome-period terms. Buffer ETFs hold options on an index, not shares, so there is no holdings overlap to report.
Every figure is an ETFIQ calculation with distributions reinvested.
Cite this pageCitation, APA and Markdown
ETFIQ, BSEP against CPST, data as of Oct 13, 2026. https://etfiq.com/compare/buffer/bsep-vs-cpst
ETFIQ. (Oct 13, 2026). BSEP against CPST. Retrieved from https://etfiq.com/compare/buffer/bsep-vs-cpst
[BSEP against CPST (ETFIQ, Oct 13, 2026)](https://etfiq.com/compare/buffer/bsep-vs-cpst)
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