# MERCK & CO INC OPTION

MERCK & CO INC OPTION is a security (CUSIP 58933Y905) tracked across SEC portfolio filings. 11 institutional managers reported $455.9M on Form 13F as of 2026-06-30.

## Summary

- Issuer: MERCK & CO INC
- Class: OPTION
- CUSIP: 58933Y905
- 13F holders: 11
- 13F value: $455.9M
- 13F period: 2026-06-30
- N-PORT fund positions: 0

## Top institutional holders (Form 13F)

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| JPMORGAN CHASE & CO | NEW YORK, NY | $194.8M | — |
| IMC-Chicago, LLC | CHICAGO, IL | $123.5M | — |
| [SIMPLEX TRADING, LLC](https://search.stillhousedata.com/firm/153585) | CHICAGO, IL | $75.3M | — |
| [GROUP ONE TRADING, L.P.](https://search.stillhousedata.com/firm/37484) | CHICAGO, IL | $47.4M | — |
| Gladius Capital Management LP | PARK CITY, UT | $14.0M | — |
| [AlphaCore Capital LLC](https://search.stillhousedata.com/firm/174346) | LA JOLLA, CA | $520K | 100 |
| SAXON INTERESTS, INC. | HOUSTON, TX | $373K | — |
| Marathon Trading Investment Management LLC | RADNOR, PA | $24K | — |
| [HRT FINANCIAL LP](https://search.stillhousedata.com/firm/152144) | NEW YORK, NY | $10K | 79,400 |
| Capital Markets Trading UK LLP | LONDON, X0 | $1K | — |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | BIRMINGHAM, AL | — | — |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/58933Y905.md)
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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.