# The largest buffer ETFs on Bitcoin

> The largest buffer ETFs on Bitcoin, ranked by net assets, as of Oct 1, 2026. 12 funds from ETFIQ’s own published figures. A ranking is not a recommendation.

Data as of Oct 1, 2026. Rebuilt every trading night.

As of Oct 1, 2026 . Rebuilt every trading night.

## The largest buffer ETFs on Bitcoin

Every fund here is struck on Bitcoin, used as the proxy for the CME CF Bitcoin Reference Rate, so the choice between them is the buffer, the cap and when the period ends.

| # | Ticker | Fund | Net assets | Buffer | Period ends | Source |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | CBTJ | Calamos Bitcoin 80 Series Structured Alt | $26m | 20% to 100% | Jan 30, 2027 | Issuer page, Sep 30, 2026 |
| 2 | CBTO | Calamos Bitcoin 80 Series Structured Alt | $19m | 21% to 100% | Oct 7, 2026 | Issuer page, Sep 30, 2026 |
| 3 | CBXJ | Calamos Bitcoin 90 Series Structured Alt | $19m | 10% to 100% | Jan 30, 2027 | Issuer page, Sep 30, 2026 |
| 4 | CBOJ | Calamos Bitcoin Structured Alt Protectio | $16m | 0% to 100% | Jan 30, 2027 | Issuer page, Sep 30, 2026 |
| 5 | CBXO | Calamos Bitcoin 90 Series Structured Alt | $7m | 11% to 100% | Oct 7, 2026 | Issuer page, Sep 30, 2026 |
| 6 | CBOO | Calamos Bitcoin Structured Alt Protectio | $6m | 1% to 100% | Oct 7, 2026 | Issuer page, Sep 30, 2026 |
| 7 | CBTA | Calamos Bitcoin 80 Series Structured Alt | $6m | 20% to 100% | May 1, 2027 | Issuer page, Sep 30, 2026 |
| 8 | CBXY | Calamos Bitcoin 90 Series Structured Alt | $6m | 10% to 100% | Jul 31, 2027 | Issuer page, Sep 30, 2026 |
| 9 | CBTY | Calamos Bitcoin 80 Series Structured Alt | $6m | 20% to 100% | Jul 31, 2027 | Issuer page, Sep 30, 2026 |
| 10 | CBOY | Calamos Bitcoin Structured Alt Protectio | $5m | 0% to 100% | Jul 31, 2027 | Issuer page, Sep 30, 2026 |
| 11 | CBOA | Calamos Bitcoin Structured Alt Protectio | $5m | 0% to 100% | May 1, 2027 | Issuer page, Sep 30, 2026 |
| 12 | CBXA | Calamos Bitcoin 90 Series Structured Alt | $5m | 10% to 100% | May 1, 2027 | Issuer page, Sep 30, 2026 |

### Method

The 12 buffer and floor ETFs ETFIQ measures on Bitcoin, used as the proxy for the CME CF Bitcoin Reference Rate, of which 12 publish net assets. Across the funds listed here the buffer each fund set out with runs from 79.4% to 99.9%. Size is not a measure of anything a fund did. It is where the money is. The ranking is the published field sorted, nothing else: no scoring, no weighting and no view on any fund. Every fund ETFIQ covers in this category is eligible, including funds that have closed, because leaving them out would flatter the category.

### Where to next

### 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.

A ranking is not a recommendation and no order on this site is an opinion. ETFIQ is an independent publisher, not an adviser. Standards and sources

Cite this page. ETFIQ, The largest buffer ETFs on Bitcoin, ranked by net assets, data as of Oct 1, 2026. https://etfiq.com/rankings/buffer-largest-on-bitcoin Free to use with attribution ; the underlying files are at Open data .

Other forms Plain ETFIQ, The largest buffer ETFs on Bitcoin, ranked by net assets, data as of Oct 1, 2026. https://etfiq.com/rankings/buffer-largest-on-bitcoin APA ETFIQ. (Oct 1, 2026). The largest buffer ETFs on Bitcoin, ranked by net assets. Retrieved from https://etfiq.com/rankings/buffer-largest-on-bitcoin Markdown [The largest buffer ETFs on Bitcoin, ranked by net assets (ETFIQ, Oct 1, 2026)](https://etfiq.com/rankings/buffer-largest-on-bitcoin)

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Source: ETFIQ, independent ETF data. Recomputed nightly from public filings and prices.
Cite: ETFIQ, as of Oct 1, 2026. https://etfiq.com/rankings/buffer-largest-on-bitcoin
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HTML: https://etfiq.com/rankings/buffer-largest-on-bitcoin