# Calamos S&P 500 Structured Alt Protection ETF - April — new fund registration

Calamos ETF Trust registered 8 new fund series on Form 485APOS, filed 2024-06-14. Featured series: Calamos S&P 500 Structured Alt Protection ETF - April.

## Registration

- Registrant / trust: Calamos ETF Trust
- CIK: 0001579881
- Form: 485APOS
- Filed: 2024-06-14
- State of incorporation: DE
- Accession: 0001104659-24-071741
- Reported net assets: $18.8M

## Series & classes (8)

| Series | Class | Ticker | New |
| --- | --- | --- | --- |
| [Calamos S&P 500 Structured Alt Protection ETF - April](https://search.stillhousedata.com/fund/S000086979) | Calamos S&P 500 Structured Alt Protection ETF - April | — | Yes |
| [Calamos S&P 500 Structured Alt Protection ETF - December](https://search.stillhousedata.com/fund/S000086980) | Calamos S&P 500 Structured Alt Protection ETF - December | — | Yes |
| [Calamos S&P 500 Structured Alt Protection ETF - February](https://search.stillhousedata.com/fund/S000086981) | Calamos S&P 500 Structured Alt Protection ETF - February | — | Yes |
| [Calamos S&P 500 Structured Alt Protection ETF - January](https://search.stillhousedata.com/fund/S000086982) | Calamos S&P 500 Structured Alt Protection ETF - January | — | Yes |
| [Calamos S&P 500 Structured Alt Protection ETF - June](https://search.stillhousedata.com/fund/S000086983) | Calamos S&P 500 Structured Alt Protection ETF - June | — | Yes |
| [Calamos S&P 500 Structured Alt Protection ETF - March](https://search.stillhousedata.com/fund/S000086984) | Calamos S&P 500 Structured Alt Protection ETF - March | — | Yes |
| [Calamos S&P 500 Structured Alt Protection ETF - November](https://search.stillhousedata.com/fund/S000086985) | Calamos S&P 500 Structured Alt Protection ETF - November | — | Yes |
| [Calamos S&P 500 Structured Alt Protection ETF - October](https://search.stillhousedata.com/fund/S000086986) | Calamos S&P 500 Structured Alt Protection ETF - October | — | Yes |

## Fees (from the effective prospectus)

- 12b-1 fee: 0.00%
- Gross expense ratio: 0.69%
- Management fee: 0.69%
- Net expense ratio: 0.69%
- Other expenses: 0.00%

## Investment objective

Calamos S&P 500 ? Structured Alt Protection ETF ? April (the "Fund") seeks to provide investment results that, before taking fees and expenses into account, match the positive price return of the SPDR ? S&P 500 ? ETF Trust ("Underlying ETF") up to a cap of 7.78% (the "Cap"), while protecting against 100% of negative price return of the Underlying ETF (before fees and expenses), for the period from April 1, 2025 through March 31, 2026.

## Advisers

- [Calamos Advisors LLC (Advisor)](https://search.stillhousedata.com/firm/105758)

## Other filings by this registrant (15)

- [485APOS — 2026-07-31 (1 new series)](https://search.stillhousedata.com/launch/0001104659-26-089292)
- [485APOS — 2026-07-31 (1 new series)](https://search.stillhousedata.com/launch/0001104659-26-089180)
- [485APOS — 2026-04-07 (1 new series)](https://search.stillhousedata.com/launch/0001104659-26-040498)
- [485APOS — 2026-04-07 (1 new series)](https://search.stillhousedata.com/launch/0001104659-26-040487)
- [485APOS — 2026-01-28 (1 new series)](https://search.stillhousedata.com/launch/0001104659-26-007366)
- [485APOS — 2026-01-28 (1 new series)](https://search.stillhousedata.com/launch/0001104659-26-007375)
- [485APOS — 2025-09-29](https://search.stillhousedata.com/launch/0001104659-25-094377)
- [485APOS — 2025-09-29](https://search.stillhousedata.com/launch/0001104659-25-094378)
- [485APOS — 2025-09-29](https://search.stillhousedata.com/launch/0001104659-25-094374)
- [485APOS — 2025-09-29](https://search.stillhousedata.com/launch/0001104659-25-094376)
- [485APOS — 2025-08-22 (1 new series)](https://search.stillhousedata.com/launch/0001104659-25-081943)
- [485APOS — 2025-08-20](https://search.stillhousedata.com/launch/0001104659-25-080971)

## More

- [Registrant profile: Calamos ETF Trust](https://search.stillhousedata.com/registrant/1579881)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/launch/0001104659-24-071741.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

---

Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.