# QUANTUM SI INC CALL

QUANTUM SI INC CALL is a security (CUSIP 74765K905) tracked across SEC portfolio filings. 5 institutional managers reported $591K on Form 13F as of 2026-06-30.

## Summary

- Issuer: QUANTUM SI INC
- Class: CALL
- CUSIP: 74765K905
- 13F holders: 5
- 13F value: $591K
- 13F period: 2026-06-30
- N-PORT fund positions: 0

## Top institutional holders (Form 13F)

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| [SIMPLEX TRADING, LLC](https://search.stillhousedata.com/firm/153585) | CHICAGO, IL | $219K | — |
| [GROUP ONE TRADING, L.P.](https://search.stillhousedata.com/firm/37484) | CHICAGO, IL | $189K | — |
| IMC-Chicago, LLC | CHICAGO, IL | $179K | — |
| [AlphaCore Capital LLC](https://search.stillhousedata.com/firm/174346) | LA JOLLA, CA | $4K | 125 |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | BIRMINGHAM, AL | — | — |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/74765K905.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.