# CALAMOS ETF TR S&P 500 STR OCTO

CALAMOS ETF TR S&P 500 STR OCTO is a security (CUSIP 12811T829) tracked across SEC portfolio filings. 22 institutional managers reported $14.6M on Form 13F as of 2026-06-30.

## Summary

- Issuer: CALAMOS ETF TR
- Class: S&P 500 STR OCTO
- CUSIP: 12811T829
- 13F holders: 22
- 13F value: $14.6M
- 13F period: 2026-06-30
- N-PORT fund positions: 0

## Top institutional holders (Form 13F)

_Showing 15 of 22 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| [Calamos Advisors LLC](https://search.stillhousedata.com/firm/105758) | NAPERVILLE, IL | $9.6M | 344,453 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | BALA CYNWYD, PA | $719K | 26,635 |
| [COMMONWEALTH EQUITY SERVICES, LLC](https://search.stillhousedata.com/firm/8032) | WALTHAM, MA | $670K | 24,062 |
| [Blue Water Asset Management](https://search.stillhousedata.com/firm/175362) | GRAND RAPIDS, MI | $570K | 20,481 |
| [Calamos Wealth Management LLC](https://search.stillhousedata.com/firm/143490) | NAPERVILLE, IL | $553K | 19,867 |
| [OLD MISSION CAPITAL LLC](https://search.stillhousedata.com/firm/146991) | CHICAGO, IL | $511K | 18,918 |
| [Grantvest Financial Group LLC](https://search.stillhousedata.com/firm/310272) | MATAWAN, NJ | $396K | 14,679 |
| [HARBOUR INVESTMENTS, INC.](https://search.stillhousedata.com/firm/19258) | MADISON, WI | $388K | 14,365 |
| [Rooted Wealth Advisors, Inc.](https://search.stillhousedata.com/firm/313759) | BOURBONNAIS, IL | $348K | 12,486 |
| [Sloy Dahl & Holst, LLC](https://search.stillhousedata.com/firm/110102) | Vancouver, WA | $290K | 10,740 |
| [Security Financial Services, INC.](https://search.stillhousedata.com/firm/122050) | Fort Wayne, IN | $282K | 10,132 |
| [Spire Wealth Management](https://search.stillhousedata.com/firm/113908) | MCLEAN, VA | $67K | 2,401 |
| OSAIC HOLDINGS, INC. | PHOENIX, AZ | $55K | 2,046 |
| MORGAN STANLEY | NEW YORK, NY | $54K | 2,000 |
| [TUCKER ASSET MANAGEMENT LLC](https://search.stillhousedata.com/firm/174844) | LITTLETON, CO | $48K | 1,782 |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/12811T829.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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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.