Largest positions
| Issuer | Class | Value | Share |
|---|---|---|---|
| Century Alum COCOM | COM | $23.2M | 16.8% |
| Sensient Technologies Corp.COM | COM | $16.2M | 11.8% |
| Constellium SECL A SHS | CL A SHS | $15.4M | 11.2% |
| Standardaero Inc.COM | COM | $13.9M | 10.1% |
| Carpenter Technology Corp.COM | COM | $12.9M | 9.4% |
| Ati Inc.COM | COM | $11.9M | 8.7% |
| Middleby Corp.COM | COM | $11.6M | 8.5% |
| Alcoa Corp.COM | COM | $10.9M | 7.9% |
| Harmony Gold Mng LtdSPONSORED ADR | SPONSORED ADR | $9.32M | 6.8% |
| Ardagh Metal Packaging S ASHS | SHS | $8.16M | 5.9% |
| Cameco Corp.COM | COM | $4.06M | 3.0% |
- Class
- COM
- Share
- 16.8%
- Class
- COM
- Share
- 11.8%
- Class
- CL A SHS
- Share
- 11.2%
- Class
- COM
- Share
- 10.1%
- Class
- COM
- Share
- 9.4%
- Class
- COM
- Share
- 8.7%
- Class
- COM
- Share
- 8.5%
- Class
- COM
- Share
- 7.9%
- Class
- SPONSORED ADR
- Share
- 6.8%
- Class
- SHS
- Share
- 5.9%
- Class
- COM
- Share
- 3.0%
The share class is shown on a wider screen.
The 11 largest of 11 positions by value, with holdings of the same security combined. Share counts and quarter-on-quarter changes for each position are on EDGAR. View the full information table on EDGAR
This filing
- Form
- 13F-HR
- CIK
- 1730532
- File number
- 028-19269
- Options
- 0 call, 0 put
- In the 25 largest
- 100.0%
- Prior quarter
- $201M at 31 March 2026
- Positions opened
- 1
- Positions closed
- 6
Common questions
What are Mountaineer Partners Management’s 13F holdings worth?
$137 million across 11 positions for the quarter ended 30 June 2026.
What is Mountaineer Partners Management’s largest 13F holding?
CENTURY ALUM CO (COM) was the largest position at $23.2 million, or 16.8% of reported 13F value, as of 30 June 2026.
How concentrated is Mountaineer Partners Management’s 13F portfolio?
The ten largest positions accounted for 97.0% of reported value and the twenty-five largest for 100.0%, across 11 positions as of 30 June 2026.
Does Form 13F show everything Mountaineer Partners Management manages?
No. Form 13F covers only long positions in exchange-traded securities over which the manager has investment discretion, valued at quarter end. It excludes cash, most bonds, private funds, and any assets the firm does not have discretion over, so it is neither the firm's total assets nor any individual client's portfolio.
How often does Mountaineer Partners Management file its 13F?
Every quarter. Managers file within 45 days of each quarter's end, so the figures are a snapshot that changes between filings. This page shows the quarter ended 30 June 2026.
Answered from this filing and the prior quarter's.